How far is a lightyear

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How far is a lightyear

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The farther an object is, the farther in the past we see it. Our Sun is the closest star to us. It is about 93 million miles away. So, the Sun's light takes about 8.

This means that we always see the Sun as it was about 8. The next closest star to us is about 4.

All of the other stars we can see with our eyes are farther, some even thousands of light-years away.

Stars are found in large groups called galaxies. A galaxy can have millions or billions of stars. The nearest large galaxy to us, Andromeda, is 2.

So, we see Andromeda as it was 2. The universe is filled with billions of galaxies, all farther away than this. Some of these galaxies are much farther away.

It is That is only million years after the big bang. It is one of the first galaxies ever formed in the universe.

Learning about the very first galaxies that formed after the big bang, like this one, helps us understand what the early universe was like.

This picture shows hundreds of very old and distant galaxies. The oldest one found so far in GN-z11 shown in the close up image. Before , the tropical year not the Julian year and a measured not defined speed of light were included in the IAU System of Astronomical Constants, used from to Allen 's Astrophysical Quantities reference work, [12] which was updated in , including the IAU value cited above truncated to 10 significant digits.

Other high-precision values are not derived from a coherent IAU system. A value of 9. Another value, 9. The light-year unit appeared a few years after the first successful measurement of the distance to a star other than the Sun, by Friedrich Bessel in The star was 61 Cygni , and he used a 6.

The largest unit for expressing distances across space at that time was the astronomical unit, equal to the radius of the Earth's orbit 1. In those terms, trigonometric calculations based on 61 Cygni's parallax of 0.

Bessel added that light takes He may have resented expressing distances in light-years because it would reduce the accuracy of his parallax data due to multiplying with the uncertain parameter of the speed of light.

The speed of light was not yet precisely known in ; its value changed in Fizeau and Foucault. It was not yet considered to be a fundamental constant of nature, and the propagation of light through the aether or space was still enigmatic.

The light-year unit appeared in in a German popular astronomical article by Otto Ule. A contemporary German popular astronomical book also noticed that light-year is an odd name.

Although modern astronomers often prefer to use the parsec , light-years are also popularly used to gauge the expanses of interstellar and intergalactic space.

Distances expressed in light-years include those between stars in the same general area, such as those belonging to the same spiral arm or globular cluster.

Galaxies themselves span from a few thousand to a few hundred thousand light-years in diameter, and are separated from neighbouring galaxies and galaxy clusters by millions of light-years.

Distances to objects such as quasars and the Sloan Great Wall run up into the billions of light-years. Distances between objects within a star system tend to be small fractions of a light-year, and are usually expressed in astronomical units.

However, smaller units of length can similarly be formed usefully by multiplying units of time by the speed of light.

Units such as the light-minute, light-hour and light-day are sometimes used in popular science publications. The light-month, roughly one-twelfth of a light-year, is also used occasionally for approximate measures.

Light travels approximately one foot in a nanosecond ; the term "light-foot" is sometimes used as an informal measure of time. From Wikipedia, the free encyclopedia.

This article is about the unit of length. For other uses, see Light year disambiguation. Map showing the stars that lie within Retrieved 15 October Kenneth Seidelmann, ed.

Allen , Astrophysical Quantities third ed. Cox, ed. Freeman, p. Bessel's statement that light employs Populäre Himmelskunde u.

Retrieved 1 November BBC News. Paul; Vogt, Steve S.

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Since the time of the ancient Greeks, scientists have had several debates on the speed of light. The German astronomer Friedrich Wilhelm Bessel was the first scientist to express distance in the light year and the first to measure the distance between a star and the earth using parallax.

He found the distance to the star, 61 Cygni, to be , astronomical units which is equivalent to 6. Popular scientific and non-specialist publications mainly use light years for describing cosmic distances.

The distance of objects in outer space is easily measured by the calculating time taken by a beam of light to the object, against the speed of light.

Since the speed of light is known, it becomes easy to calculate the distance covered in light years. Light years also express the distance from the bodies within the solar system and the galaxies and star systems outside of the solar system.

The farther an object is, the farther in the past we see it. Our Sun is the closest star to us. It is about 93 million miles away.

So, the Sun's light takes about 8. This means that we always see the Sun as it was about 8. The next closest star to us is about 4. All of the other stars we can see with our eyes are farther, some even thousands of light-years away.

Stars are found in large groups called galaxies. A galaxy can have millions or billions of stars. The nearest large galaxy to us, Andromeda, is 2.

So, we see Andromeda as it was 2. The universe is filled with billions of galaxies, all farther away than this. Some of these galaxies are much farther away.

BBC News. Paul; Vogt, Steve S. Anton; Kellermann; Kenneth I. Listen to this article. This audio file was created from a revision of this article dated 27 June , and does not reflect subsequent edits.

Audio help More spoken articles. Units of length used in Astronomy. Astronomical system of units. See also Cosmic distance ladder Orders of magnitude length Conversion of units.

Categories : Light Units of length Units of measurement in astronomy in science. Hidden categories: Articles with short description Short description is different from Wikidata Pages using deprecated image syntax Articles containing potentially dated statements from October All articles containing potentially dated statements Spoken articles Articles with hAudio microformats.

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Download as PDF Printable version. Reflected sunlight from the Moon 's surface takes 1. One astronomical unit the distance from the Sun to the Earth.

It takes approximately seconds 8. The Huygens probe lands on Titan off Saturn and transmits images from its surface, 1.

New Horizons encounters Pluto at a distance of 4. The most distant space probe , Voyager 1 , was about 18 light-hours away from the Earth as of October [update].

On September 12, , NASA scientists announced that Voyager 1 had entered the interstellar medium of space on August 25, , becoming the first manmade object to leave the Solar System.

The Oort cloud is approximately two light-years in diameter. Beyond this is the deep ex-solar gravitational interstellar medium. The nearest known star other than the Sun , Proxima Centauri , is about 4.

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