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- A light-year is a measurement of distance, not time1. It is the distance that light travels in one Earth year21345. Light travels at a speed of about 300,000 km per second (about 186,000 miles per second) in a vacuum345. One light-year is about 6 trillion miles (9 trillion km)21. It is important to specify a vacuum because light slows as it passes through any kind of matter5.
Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.A light-year is a measurement of distance and not time (as the name might imply). A light-year is the distance a beam of light travels in a single Earth year, which equates to approximately 6 trillion miles (9.7 trillion kilometers).www.space.com/light-year.htmlFor most space objects, we use light-years to describe their distance. A light-year is the distance light travels in one Earth year. One light-year is about 6 trillion miles (9 trillion km). That is a 6 with 12 zeros behind it!spaceplace.nasa.gov/light-year/en/A light year (symbol: ly) is the distance that light travels in empty space in one year. Since the speed of light is about 300,000 km per second (about 186,000 miles per second), then a light year is 9.46 trillion kilometers (about 5.87 trillion miles), for AU, one light year is 63,241 AU.simple.wikipedia.org/wiki/Light_yearlight-year, in astronomy, the distance traveled by light moving in a vacuum in the course of one year, at its accepted velocity of 299,792,458 metres per second (186,282 miles per second). A light-year equals about 9.46073 × 10 12 km (5.87863 × 10 12 miles), or 63,241 astronomical units. About 3.262 light-years equal one parsec.www.britannica.com/science/light-yearA light-year is the distance a beam of light travels in a vacuum in one year. It’s important to specify a vacuum because light slows as it passes through any kind of matter. (In water, for instance, it travels about 25 percent slower.)www.nbcnews.com/mach/science/what-light-year-n… What is a light-year and how is it used?? - NASA
WEBA light-year is a unit of distance. It is the distance that light can travel in one year. Light moves at a velocity of about 300,000 kilometers (km) each second.
StarChild: Galaxies - NASA
WEBA light-year is the distance light travels in one year. It is 9.5 trillion (9,500,000,000,000) kilometers. The size of a galaxy may be as little as a thousand light-years across or as …
Redshift and Hubble's Law - NASA
WEBIn 1929, Edwin Hubble announced that almost all galaxies appeared to be moving away from us. In fact, he found that the universe was expanding - with all of the galaxies …
StarChild: Glossary - NASA
WEBLIGHT YEAR The distance light can travel in one year, which is 9,500,000,000,000 kilometers. LUNAR MODULE The section of the Apollo spacecraft designed to land on …
What is a light-year and how is it used??
WEBA light-year is a unit of distance. It is the distance that light can travel in one year. Light moves at a velocity of about 300,000 kilometers (km) each second. So in one year, it …
Just How Big is this Place? - NASA
WEBA light year is equal to 9,500,000,000,000 km and is the distance that light travels in one year. A light year can be expressed as 9.5 trillion km or in scientific notation as 9.5 x 10 …
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StarChild: The Milky Way - NASA
WEBThe Milky Way is over 100,000 light-years wide. It is called a spiral galaxy because it has long arms which spin around like a giant pinwheel. Our Sun is a star in one of the arms. …
What is a light-year and how is it used??
WEBA light-year is a unit of distance. It is the distance that light can travel in one year. Light moves at a velocity of about 300,000 kilometers (km) each second.
Parallax - NASA
WEBParallax. Astronomers derive distances to the nearest stars (closer than about 100 light-years) by a method called stellar parallax. This method that relies on no assumptions …
Does the Sun move around the Milky Way? - NASA
WEBThe Sun (and, of course, the rest of our solar system) is located near the Orion arm, between two major arms (Perseus and Sagittarius). The diameter of the Milky Way is …
How do we measure the distances to things in space? - NASA
WEBThe links below will take you to descriptions of various common methods. Radar - measuring distances in our solar system. Parallax - measuring distances to nearby …
StarChild: Stars - NASA
WEBStars evolve, or change, over time. It may take millions of years or it may take billions of years for a star to complete its life cycle. A star is a brilliantly glowing sphere of hot gas …
Supernovae - NASA
WEBSupernovae. At large distances (up to about 1 billion light-years), astronomers can no longer use methods such as parallax or Cepheid variables. At such large distances, the …
Cepheids - NASA
WEBCepheids. Cepheids, also called Cepheid Variables, are stars which brigthen and dim periodically. This behavior allows them to be used as cosmic yardsticks out to distances …
StarChild: The Milky Way - NASA
WEBOur solar system is 26,000 light-years from the center of the Galaxy. All objects in the Galaxy revolve around the Galaxy's center. It takes 250 million years for our Sun to pull …
Why do stars twinkle? - NASA
WEBAnswer: On a clear, dark night, our eyes can see about 6,000 or so stars in the sky. They seem to twinkle, or change their brightness, all the time. In fact, most of the stars are …
StarChild: The Sun - NASA
WEBThe Sun is a medium size star known as a yellow dwarf. It is a star in the Milky Way galaxy and the temperature in its core is estimated to be over 15,000,000 degrees Celsius. In …
Why is there day and night? - NASA
WEBWhy is there day and night? Answer: Clearly, when you see the Sun shining in the sky, it is day, and when you don't it is night. So the real question is "why is the Sun in the sky …
Where do comets come from? - NASA
WEBAnswer: Comets are believed to have two sources. Long-period comets (those which take more than 200 years to complete an orbit around the Sun) originate from the Oort Cloud. …
Can you see other galaxies without a telescope? - NASA
WEBThink about what you are really seeing: It is a whole other GALAXY, not an object within our own Milky Way! The Andromeda Galaxy is about 2.5 million light-years away and is …
Constellations - NASA
WEBIntroduction: 1. Review the difference between a star, a constellation and a galaxy. 2. Read several short examples of myths explaining constellations. There are several short …
What causes a "falling star"? - NASA
WEBAnswer: A "falling star" or a "shooting star" has nothing at all to do with a star! These amazing streaks of light you can sometimes see in the night sky are caused by tiny bits …
StarChild: Multidisciplinary Solar System Activities: Planet Hop
WEBPlanet Hop. Below is a chart which lists the (relative to Earth's) of each planet in our solar system. Also included in the chart is the number of Earth years it takes for that planet to …
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