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For example, the light-second, useful in astronomy, telecommunications and relativistic physics, is exactly 299 792 458 metres or 1 / 31 557 600 of a light-year. Units such as the light-minute, light-hour and light-day are sometimes used in popular science publications.
This number is likely much higher, due to the sheer number of stars needed to be surveyed; a star approaching the Solar System 10 million years ago, moving at a typical Sun-relative 20–200 kilometers per second, would be 600–6,000 light-years from the Sun at present day, with millions of stars closer to the Sun.
1.2 Em – 129 light-years – diameter of Messier 13 (a typical globular cluster) 1.6 Em – 172 ± 12.5 light-years – diameter of Omega Centauri (one of the largest-known globular clusters, perhaps containing over a million stars) [199] [200] 3.08568 Em – 326.1 light-years – 1 hectoparsec
List of nearest stars (up to 20 light-years); List of star systems within 20–25 light-years; List of star systems within 25–30 light-years; List of star systems within 30–35 light-years
This is a list of star systems within 75–80 light years of Earth. The closest B-type star, Regulus , is in this list. This list is incomplete ; you can help by adding missing items .
Distance light travels in one day — Light-year: 63 241 — Distance light travels in one Julian year (365.25 days) — Oort cloud: 75 000: ± 25 000: Distance of the outer limit of Oort cloud from the Sun (estimated, corresponds to 1.2 light-years) — Parsec: 206 265 — One parsec. The parsec is defined in terms of the astronomical unit, is ...
540.89 kiloparsecs (1,764,000 light-years) 90% total B-light: Central galaxy of Abell 3571 [citation needed] Largest spiral galaxy NGC 6872: Pavo: 220 kiloparsecs (718,000 light-years) D 25.5 isophote: Interacting galaxy, stripped by IC 4970. [citation needed] Largest irregular galaxy UGC 6697: Leo: 62.82 kiloparsecs (205,000 light-years) D 25 ...
The first report of an exoplanet within this range was in 1998 for a planet orbiting around Gliese 876 (15.3 light-years (ly) away), and the latest as of 2024 is one around Struve 2398 A (11.5 ly). The closest exoplanets are those found orbiting the star closest to the Solar System, which is Proxima Centauri 4.25 light-years away