This means that the numbers used to describe distances in space become very difficult to understand and to write down. For example, the distance between the Earth and the Sun is about ,,, m but the distance to the next nearest star Proxima Centauri is 39,,,,, m.
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To get around this problem, scientists use the light year as the unit of astronomical distance. It is the distance travelled by light in one year. So, for example:. It takes light from our Sun about 8 minutes to reach the Earth. The Sun and its role in our galaxy. Stars and galaxies Our Sun is a star.
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Beyond Our Solar System
This box: view talk edit. See also: intergalactic star. See also: Stellar engine. Spaceflight portal. September—October The Futurist. Journal of the British Interplanetary Society. Bibcode : JBIS Bibcode : Natur. Astrophysical Journal. Bibcode : ApJ The Hyper-Velocity Star Project. Retrieved 20 September The Astrophysical Journal.
Discovery News. Retrieved October 18, Retrieved 16 September Retrieved 4 April Classical and Quantum Gravity. Bibcode : CQGra..
The Limits Of How Far Humanity Can Go In The Universe
Between large galaxies like the Milky Way and M31, they are typically a few million light-years. Astronomy Earth observation Archaeology Imagery and mapping Reconnaissance Weather and environment monitoring Satellite communications Internet Radio Telephone Television Satellite navigation Commercial use of space Space launch market competition Militarisation of space Space architecture Space exploration Space research Space technology Space weather. Astronaut commercial Life support system Animals in space Bioastronautics Space suit Extravehicular activity Weightlessness Space toilet Space tourism Space colonization.
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NASA Is Taking a New Look at Searching for Life Beyond Earth | NASA
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