The Sun does not lie near the center of our Galaxy. There are brighter stars than Sirius in terms of actual energy and light output, but they are farther away and hence appear dimmer. This is because our eyes contain two different kinds of photoreceptors cones and rods. The oldest one found so far in GN-z11 (shown in the close up image). (Take a solar system quiz.). Visit our corporate site (opens in new tab). Science news, great photos, sky alerts. A new discovery raises a mystery. Future US, Inc. Full 7th Floor, 130 West 42nd Street, The brightness, twinkling and color changes sometimes prompt people to report Sirius as a UFO! Moving clusters: Clusters of stars, such as the Pleiades and Hyades star clusters, travel together. If we measure the period of such a star, we can calculate its luminosity. Although the light year is a commonly used unit, astronomers prefer a different unit called the parsec (pc). Heres how it works. However, its too far south in the sky to see easily from mid-northern latitudes. This is what Indra had wanted to hear, and then he welcomed both the prince and the dog through the gates of heaven. It can be seen from latitudes like those of the southern U.S. Sirius is always easy to find. To the naked eye, the nebula appears as a fuzzy gray smudge under Orion's Belt. At 8.6 light-years distance, Sirius is one of the nearest stars to us after the sun. ; ) This is an interesting question. (See the Nearest Stars page for more information on Hipparcos measurements.). Therefore a light year is exactly 9,460,730,472,580.8 kilometers. (Also see "New Supernova Found 'Next Door'Getting Brighter."). 1 A.U. Deep view of the Orion Nebula, imaged from multiple exposures using the HAWK-I infrared camera on the European Southern Observatory's Very Large Telescope in Chile. The farther an object is, the farther in the past we see it. Osiris was an Egyptian god of life, death, fertility and rebirth of plant life along the Nile. Although the floods could bring destruction, they also brought new soil and new life. Not only can they be found at the far reaches of our Galaxy, they can also be resolved in galaxies outside of our own. The large chasm carved by the Trapezium conveniently faces Earth, allowing observers to peer deep into the nebula's "heart" to view the rich tapestry of star formation within. Explanation: A light year is the distance light will travel in a vacuum over the period of one (earth) year. Once a mighty star, the Pup today is an Earth-sized ember, too faint to be seen without a telescope. Webentertainment, news presenter | 4.8K views, 28 likes, 13 loves, 80 comments, 2 shares, Facebook Watch Videos from GBN Grenada Broadcasting Network: GBN News 28th April The entire scene is sculpted by stellar winds ejected by young stars that also emit powerful ultraviolet light. WebLight Year Conversions. Daisy Dobrijevic joined Space.com in February 2022 having previously worked for our sister publication All About Space magazine as a staff writer. The Voyager spacecraft is traveling away from the Sun at a rate of 17.3 km/s. Copyright 1996-2015 National Geographic Society, Copyright 2015-2023 National Geographic Partners, LLC. Last year alone, there were over 47,000 earthquakes in Alaska and surrounding regions. While the orange color can be attributed to hydrogen, the green to oxygen and the red representing both sulfur and infrared light observations, according to NASA. Some of these galaxies are much farther away. God made the Earth and made the heavens enlarge. For instance, research on dark energythe mysterious force thought to be causing the universe to fly apart faster over timeis dependent on stars such as the North Star. What types of jobs are available for those who hold a degree in astronomy? WebOur galaxy probably contains 100 to 400 billion stars, and is about 100,000 light-years across. Web4.1K views, 50 likes, 28 loves, 154 comments, 48 shares, Facebook Watch Videos from 7th District AME Church: Thursday Morning Opening Session For this reason, it's vital for our understanding of the cosmos that scientists get a reliable grip on the North Star's true distance, emphasized Turner, whose study will appear in Astrophysical Journal Letters. This picture shows hundreds of very old and distant galaxies. The most luminous Cepheids can be used to estimate distances to objects as far as 12,000,000 light years away. The star was associated with the Egyptian gods Osiris, Sopdet and other gods. At 8.6 light-years distance, Sirius is one of the nearest stars to us after the sun. So, we see Andromeda as it was 2.5 million years in the past. CNN . As seen from around the world, Sirius rises in mid-evening in December. Though if conditions are right it is possible to see the blue-green hue emitted by oxygen ions in the Orion Nebula, according to lifestyle and entertainment magazine Jersey's Best (opens in new tab). Even with these (and other) complications, Cepheid Variables provide an excellent way to measure the relative distances. In short, at a maximum velocity of 56,000 km/h, Deep Space 1 would take over 81,000 years to traverse the 4.24 light-years between Earth and Proxima Centauri. Learning about the very first galaxies that formed after the big bang, like this one, helps us understand what the early universe was like. These hot young stars emit ultraviolet light that carves through the core of the nebula, leaving large cavities void of the thick clouds of gas and dust. It was not until early in the 20th century that Harlow Shapley used observations of RR Lyrae variable stars to estimate our Galaxy's size. The spectrum is the array of colors or wavelengths that is obtained when light is dispersed.) Credit: NASA, ESA, P. Oesch (Yale University), G. Brammer (STScI), P. van Dokkum (Yale University), and G. Illingworth (University of California, Santa Cruz). Part boulder, part myth, part treasure, one of Europes most enigmatic artifacts will return to the global stage May 6. This image makes the Milky Way appear much more galaxy-like and less like the smudge of stars we see stretching across our night sky. ET on EWTN: Holy Mass and Rosary on Saturday, If you need help processing your images, check out our guide on the best photo editing apps for astrophotography. What schools are renowned for their astronomy programs? The inverse-square law says that the flux from a luminous object decreases as the square of its distance. The new discovery of a closer North Star is "most unexpected for what is considered to be one of the Hipparcos satellite's most solid results," said study leader David Turner, an astronomer at Saint Mary's University in Halifax, Nova Scotia. The new results also located nearly a half dozen stars that appear to be surrounding the North Star and show signs that they have all once belonged to the same star cluster, which has now dispersed. That means its a much hotter star than our sun; its surface temperature is about 17,000 degrees Fahrenheit (9,400 Celsius) in contrast to our suns 10,000 degrees F (5,500 C). In an hour, light can travel 671 million miles. 16K views, 545 likes, 471 loves, 3K comments, 251 shares, Facebook Watch Videos from EWTN: Starting at 8 a.m. (Image credit: NASA, ESA, M. Robberto (Space Telescope Science Institute/ESA) and the Hubble Space Telescope Orion Treasury Project Team). Analyzing the apparent motion of the cluster can give us the distance to it. Sirius is behind the sun as seen from Earth in Northern Hemisphere summer. Image Credit: The Isaac Newton Group of Telescopes, La Palma, and Simon Dye (Cardiff University). So, the Sun's light takes about 8.3 minutes to reach us. Therefore a light year is exactly 9,460,730,472,580.8 kilometers. Light crosses that distance in about 1 1/2 seconds. WebThe closest known galaxy to Earth is the Canis Major Dwarf Galaxy, at 25,000 light years from the Sun. A black hole has been discovered 1,000 light-years from Earth, making it the closest black hole to our solar system ever found. This is very helpful for mapping the disk portion of our Galaxy. How would you calculate the energy of a photon with a known frequency? How many light Plus, anyone familiar with the constellation Orion can simply draw a line through Orions Belt to find this star. The prince and his four brothers, along with Svana, set out on a long and arduous journey to find the kingdom of heaven. WebUsing the radius of Earths orbit as the baseline, the distance of the star can be found from the parallactic angle, p. If p = 1 (one second of arc), the distance of the star is 206,265 times Earths distance from the Sun namely, 3.26 light-years. The neutral hydrogen gas in our Galaxy emits light at a wavelength of 21 cm; while this light is invisible to our eyes, it is observable to radio telescopes. The varying density and temperature of Earths air affect starlight, especially when were seeing the star low in the sky. By the way, a light However, one by one the brothers all abandoned the search until only Yudhisthira and his dog, Svana, were left. New York, Heaven is almost 46 billion light-years higher than the Earth. Unauthorized use is prohibited. Our Solar System - Cosmic Distances NASA Solar System Exploration If you've already donated, we apologize for the popup and greatly appreciate your support. The predicted rotation curves for many galaxies (in particular, spiral galaxies like the Milky Way) don't match the observed ones, which led to the discovery of dark matter as an explanation for this discrepancy. Normally, the only objects that outshine Sirius in our heavens are the sun, moon, Venus, Jupiter, Mars and Mercury (and usually Sirius outshines Mercury, too). How does Earth look from outer space? If we know the luminosity of a star (for instance, we have a measured parallax for one star of the same type and know that others of the same type will have similar luminosities), we can measure its apparent brightness and then solve for its distance. At 17.3 km/s, it would take Voyager over1,700,000,000 years to traverse the entire length of the Milky Way. One light-year is equal to 9.46 1012 kilometers. Because we dwell within the Milky Way Galaxy, it is impossible for us to take a picture of its spiral structure from the outside. Who buys lion bones? Although the black hole Space is part of Future US Inc, an international media group and leading digital publisher. is the average distance between the Sun and the Earth, which is about 8.3 light minutes. If Voyager were to travel to the center of our Galaxy, it would take more than 450,000,000 years to travel the 8 kpc. SpaceX Dragon debris lights up sky in bright fireball over western US during reentry (video), Europe's JUICE Jupiter probe has an antenna glitch in deep space, Your monthly guide to stargazing & space science, Subscribe for just 1 per issue with our Spring Savings, Issues delivered straight to your door or device, Learn more about the Orion Nebula with this free course from the, View one of the largest near-infrared high-resolution mosaics of the Orion A molecular cloud with the, Read about the supersonic bullets of gas in the Orion Nebula described by the. On average the sun is 1.58137 10-5 light-years away from the earth. The star is also a type of cosmological yardstick used by researchers to measure great cosmic distances out to billions of light-years. Its a main-sequence star, meaning it produces most of its energy by converting hydrogen into helium through nuclear fusion. What is the difference between astronomy and astrology? | NASA Space Place NASA Science for Kids Sopdet who might have an even closer association with the star Sirius began as an agricultural deity in Egypt, also closely associated with the Nile. Sirius is classified by astronomers as an A type star. Sirius is well known as the Dog Star, because its the chief star in the constellation Canis Major the Greater Dog. Star trailsthe results of a long exposure and Earth's rotationsurround the North Star. When we use powerful telescopes to look at distant objects in space, we are actually looking back in time. Since light travels at about #186,300# miles per second, with #86,400# seconds per day and about #365# days per year, that works out at about: #186300xx86400xx365 ~~ 5,875,000,000,000# miles. A galaxy can have millions or billions of stars. There is much debate at present in this area, in particular regarding the Hipparcos measurements of distances to nearby Cepheids. The prince said that, without his dog, he would forsake even heaven. A G2 storm typically happens 360 days every 11 years, the center says. The image is a bit blurry because this galaxy is so far away. 2. So traveling at light speed, it would only take a little more than 4 years to get there. Credit: NASA/JPL-Caltech. Yudhisthira was aghast and told Indra that he could not forsake his good and faithful servant and friend. Why do astronomers use scientific notation to describe sizes? 17K views, 519 likes, 455 loves, 3.7K comments, 232 shares, Facebook Watch Videos from EWTN: Starting at 8 a.m. It's, therefore, no surprise that the Orion Nebula has captivated civilizations around the world. STDs are at a shocking high. Not counting the sun, the second-brightest star in all of Earths sky next-brightest after Sirius is Canopus. How many years is a light-year?Light-year is the distance light travels in one year. We thought we knew turtles. Shapley was able use these to find the distance to the globular clusters that surround our Galaxy. Shapley's first estimate of the radius of the Milky Way was off by a factor of 2, but he made an important first step in understanding the nature of our Galaxy. Light takes about 8 minutes to make that journey. Credit: ESA/Hubble & NASA, RELICS; Acknowledgment: D. Coe et al. A new report released by the Alaska Earthquake Center shows a quiet year for earthquakes in 2022. Not only were the globular clusters great distances away, but the Sun did not lie at the center of their distribution, which placed the Sun far from the center of the Galaxy. In ancient Egypt, the name Sirius signified its nature as scorching or sparkling. WebI'm afraid Heaven is far, FAR from earth. Astronomers express the brightness of stars in terms of stellar magnitude. Although the light year is a commonly used unit, astronomers prefer a different unit called the parsec (pc). That significantly revises the previously accepted value of 434 light-years, which was obtained by the European star-mapping satellite Hipparcos in the 1990s. From the Southern Hemisphere, it swings high overhead. (Absorption lines are colors missing in a continuous spectrum because of their absorption by atoms or ions. Sirius is roughly eight times as far from the Belt as the Belt is wide. For an added challenge, convert each distance to light minutes or light seconds.) Inverse-square law: The apparent brightness or magnitude of a star depends both on its intrinsic brightness or luminosity (how bright the star actually is rather than how bright it seems) and its distance from us. Some stargazers are fortunate enough to detect the green hues because the human eye is more sensitive to yellow-green light as opposed to red, according to Iowa State University (opens in new tab), so if any color is to be detected from the Orion Nebula it is likely to be at the green end of the spectrum. Sirius has a small, faint companion star appropriately called the Pup, or Sirius B. A trip at light-speed to the very edge of our solar system the farthest reaches of the Oort Cloud, a collection of dormant comets way, way out there would take about 1.87 years. According to ecotourism website Mirador Park (opens in new tab), the astronomical interpretations and mythological beliefs of inhabitants at sites such as El Mirador are reflected in the architecture found at the sites, particularly the astronomically-inspired "triadic pattern." By the way, a light year is nearly 6 trillion miles (9.4 trillion km)! His brothers, Yudhisthira said, had abandoned the journey to heaven to follow their hearts desires. The average distance from the sun to the earth is 92,955,817 miles. With slightly more than twice the mass of the sun and just less than twice its diameter, Sirius still puts out 26 times as much energy. Deborah Byrd created the EarthSky radio series in 1991 and founded EarthSky.org in 1994. But Svana, who had given his heart freely, chose to follow none but Yudhisthira. Interestingly, the size of our own Galaxy was debated for a long while. Bottom line: Sirius is the brightest star in the night sky as seen from Earth and is visible from both hemispheres. Below is a picture of the real Milky Way taken by the satellite COBE. One civilization in particular where the Orion Constellation and nebula were an intrinsic part of their culture was the Maya. According to researchers, the Orion Complex consists of several molecular clouds including the Lambda Orionis Clouds, the Orion A Cloud (which includes the Orion Nebula) and the Orion B Cloud (which includes the Flame Nebula), a complete list of Orion Complex nebulae can be found in a comprehensive paper published in the Astrophysical Journal (opens in new tab). If you can measure the average speed of stars as they move around the Galactic Center and their distance from the Galactic Center, you can make a plot called a "rotation curve". Scientists and astronomers sometimes use parsecs to express the distance to stars or galaxies, instead of light years. More: Astrophotography for beginners: How to shoot the night sky. Since light travels at about 186,300 miles per second, with Brown dwarfs are sometimes referred to as 'failed' stars as they're too small to sustain nuclear fusion in their cores. WebThe year used by the International Astronomical Union is 365.25 days. Web: One parsec is approximately 3.26 light years. 16K views, 545 likes, 471 loves, 3K comments, 251 shares, Facebook Watch Videos from EWTN: Starting at 8 a.m. Although white to blue-white in color, Sirius might be called a rainbow star, as it often flickers with many colors. A G2 storm typically happens 360 days every 11 years, the center says. NY 10036. Join our Space Forums to keep talking space on the latest missions, night sky and more! Period-luminosity relation: Some stars are regular pulsators, meaning their intensity changes periodically. From the mid-northern latitudes such as most of the U.S., Sirius rises in the southeast, arcs across the southern sky, and sets in the southwest. The Orion Nebula was then independently observed in 1618 by Swiss astronomer Johann Baptist Cysat according to the science communication website The Planets. In India, Sirius is sometimes known as Svana, the dog of Prince Yudhisthira. ", "New Galaxy Maps to Help Find Dark Energy Proof? There are several variations on this, many of which are used to measure distances to stars in other galaxies. WebIt takes 75,000 years for the light from those stars to reach earth. The shimmering and color changes happen for other stars, too, but these effects are more noticeable for Sirius because Sirius is so bright. Though we may not be able to see all the impressive colors of the Orion Nebula directly, by using the right camera filters and image processing techniques, astrophotographers can produce visually stunning images of the Orion Nebula, awash with vibrant color. It is thought that these galaxies consist of a large, round halo of dark matter, with the visible matter concentrated in a disk at its center. Its the skys brightest star! If you need imaging gear, consider our best cameras for astrophotography and best lenses for astrophotography.). "There definitely remain a few oddities to keep Polaris an object of study for many years to come. All of the other stars we can see with our eyes are farther, some even thousands of light-years away. (See star pictures.). 17K views, 519 likes, 455 loves, 3.7K comments, 232 shares, Facebook Watch Videos from EWTN: Starting at 8 a.m. A good astrophotography guide for capturing a stunning image of the Orion Nebula can be found on the astrophotography website AstroBackyard (opens in new tab). The flickering colors are especially easy to notice when you spot Sirius low in the sky. In fact, the North Staralso called Polarisis 30 percent closer to our solar system than previously thought, at about 323 light-years away, according to an international team who studied the star's light output. From this, and its apparent magnitude, we can calculate its distance. As part of the constellation Canis Major the Greater Dog, Sirius also earns the nickname of the Dog Star. Your submission has been received! The colors of the Orion Nebula can be attributed to different chemical elements. The disk and center region of our Galaxy are readily recognizable. To find the Orion Nebula, you first need to locate the constellation Orion, then find Orion's Belt. How this animal can survive is a mystery. Treat yourself! Famous star's distance was overestimated in previous studies, astronomers say. To convert to absolute distances, we ideally need to measure the distance to a nearby Cepheid with another, more direct, method. Even traveling at the speed of light, it would take nearly a hundred thousand years! Under Orion's Belt, are three dimmer stars that form Orion's sword, then in the middle of the sword is the Orion Nebula. In 1880, Henry Draper captured the first image of the Orion Nebula, according to the American Institute of Physics (opens in new tab) and astrophotographers have been captivated by the Orion Nebula ever since. All rights reserved. Create Your Free Account or Sign In to Read the Full Story. Please be respectful of copyright. The seven heavens and the earth perpetually celebrate Gods praise (sura 17:44) and by their majestic design provide evidence that God indeed has the power to The little-known history of the Florida panther. By mid-April, Sirius is setting in the southwest in mid-evening. Last year alone, there were over 47,000 earthquakes in Alaska and surrounding regions. What occupations are there in the astronomy field? Image Credit: The COBE Project, DIRBE, NASA, A service of the High Energy Astrophysics Science Archive Research Center (. How many light-years is this? Where will the northern lights appear? A light-year is the distance light travels in one Earth year. The Bible doesnt say how far heaven is from Earth, though some theologians believe that there is enough evidence in Scripture to conclude that it exists somewhere in Have you ever heard anyone speak of the dog days of summer? How many light-years is this? The North Star has been a guiding light for countless generations of navigators. In 2016, NASA's Hubble Space Telescope looked at the farthest galaxy ever seen, called GN-z11. If it could travel at the speed of light, an impossibility due to Special Relativity, it would still take over 26,000 years to arrive! First, the relationship itself depends on the chemical composition of the star. Distance Information. Statistically, stars move at about the same rate; therefore, the stars that appear to have larger motions are nearer. 55K views, 2.4K likes, 2.7K loves, 2.5K comments, 240 shares, Facebook Watch Videos from ABS-CBN News: Healing Eucharist Mass | Teleradyo (30 April 2023) A light year is the distance that light travels in one year. An example of the importance of this triadic pattern within Maya life were the three hearth stones (or Ox Te Tun) found in every Maya Kitchen, according to Mirador Park. The position of Sirius is RA: 06h 45m 08.9s, dec: -16 42 58. From the Northern Hemisphere, Sirius arcs across in the southern sky. Light zips through interstellar space at 186,000 miles (300,000 kilometers) per second and 5.88 trillion miles (9.46 trillion kilometers) per year.Why do we calculate light-years?A light-year is a measurement of distance in space. Light travels at a speed of 186,000 miles (or 300,000 km) per second. Typically, RR Lyrae stars are less luminous than Cepheids, but they are much more common. So, when we see this star today, were actually seeing it as it was 4.3 years ago. All rights reserved, "New Supernova Found 'Next Door'Getting Brighter. science communication website The Planets, astrophotographers can capture stunning images, Budget telescopes under $500: Picks from Celestron, Meade and Orion, Astrophotography for beginners: How to shoot the night sky, best photo editing apps for astrophotography, Star Trek's bad captains: Celebrating Starfleet's less-than-perfect commanding officers, Best free Star Trek: TNG & Picard 3D prints. This stone has a mysterious past beyond British coronations, Ultimate Italy: 14 ways to see the country in a new light, 6 unforgettable Italy hotels, from Lake Como to Rome, A taste of Rioja, from crispy croquettas to piquillo peppers, Trek through this stunning European wilderness, Land of the lemurs: the race to save Madagascar's sacred forests, Photograph by James Forte, National Geographic. Today, she serves as Editor-in-Chief of this website. Oops! A new report released by the Alaska Earthquake Center shows a quiet year for earthquakes in 2022. 3. To save chestnut trees, we may have to play God, Why you should add native plants to your garden, What you can do right now to advocate for the planet, Why poison ivy is an unlikely climate change winner, The gory history of Europes mummy-eating fad, This ordinary woman hid Anne Frankand kept her story alive, This Persian marvel was lost for millennia. But archaeology is confirming that Persia's engineering triumph was real. It is suggested that the three stones represent three stars in the Orion Constellation Rigel, Alnitak and Saiph. WebHowever, assuming that it is there, it is located 4.37 light-years from Earth. Where will the northern lights appear? It is about 93 million miles away. In fact, these changes are simply what happens when such a bright star as Sirius shines through the blanket of Earths atmosphere. Web4.1K views, 50 likes, 28 loves, 154 comments, 48 shares, Facebook Watch Videos from 7th District AME Church: Thursday Morning Opening Session An image of distant galaxies captured by the NASA/ESA Hubble Space Telescope. around the world. It is one of the first galaxies ever formed in the universe. How are Hubble Space Telescope images made? The smaller the number, the brighter the star. The methods to measure stellar distances greater than a few thousand light years include: Proper motions: All stars move across the sky, but only for nearby stars are these motions perceivable, and even then it takes decades or centuries to measure. Unlike Hubble, our eyes cannot distinguish the vibrant dues of the Orion Nebula. Something went wrong while submitting the form. Web4.1K views, 50 likes, 28 loves, 154 comments, 48 shares, Facebook Watch Videos from 7th District AME Church: Thursday Morning Opening Session That name signifies youth, but in fact the companion to Sirius is a dead star called a white dwarf. Axolotls and capybaras are TikTok famousis that a problem? (Each of these distances is less than one light-year. (See "New Galaxy Maps to Help Find Dark Energy Proof?"). In 2006, the Hubble Space Telescope captured the sharpest view of the Orion Nebula ever seen, a stunning image revealing more Sometimes this leaves absorption lines in the spectrum we observe from stars that lie beyond the interstellar gas. Normally, I would be skeptical of such supernatural claims, but having grown up near WebA light-year is a unit of length used to measure astronomical distances. It is 13.4 billion light-years away, so today we can see it as it was 13.4 billion years ago. It is the distance that light can travel in a year (almost 365.25 days). Webeach distance to light-years. For some long COVID patients, exercise is bad medicine, Radioactive dogs? Not all of the stars in the Orion Nebula are "successful." Your email address will only be used for EarthSky content. Astronomers believe the Orion Nebula generates enough water molecules (opens in new tab) to fill the Earth's oceans 60 times over, in just a single day, according to ESA. A parsec, equal to 3.26 light years, is defined as the distance at which 1 Astronomical Unit subtends an angle of 1 second of arc (1/3600 of a degree) When we use the parsec for really large distances, we often put a This newfound behavior may offer a clue to how these reptiles will respond to a warming planet. Distance from Earth: 1,350 light-years. How is the acceleration of gravity calculated for planets. In 2006, the Hubble Space Telescope captured the sharpest view of the Orion Nebula ever seen, a stunning image revealing more than 3000 stars, some for the very first time, according to the European Space Agency (opens in new tab). How do we reverse the trend? As one of the brightest nebulas in the sky, it comes as no surprise that the Orion Nebula was the first nebula to be photographed. 55K views, 2.4K likes, 2.7K loves, 2.5K comments, 240 shares, Facebook Watch Videos from ABS-CBN News: Healing Eucharist Mass | Teleradyo (30 April 2023) Astrophotography with a film camera: Is it possible? Interstellar lines: The space between stars is not empty, but contains a sparse distribution of gas. In the central region of the Orion Nebula are four bright stars in an open star cluster known as the Trapezium due to their trapezoidal arrangement, according to NASA (opens in new tab). That is only 400 million years after the big bang. This seems really fast, but objects in space are so far away that it takes a lot of time for their light to reach us. A light-year is the distance light travels in one Earth year.
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