Binary system (astronomy)
From Free net encyclopedia
Image:SW binary sunset.png A binary system is an astronomy term referring to two objects in space, usually stars, which are so close that their gravitational forces attract one another into a mutual orbit. Astronomers find that more than 50% of stars are binary stars. A multiple system is like a binary system but consists of three or more objects.
See Binary star for the common case of a binary system composed of two stars.
| Location | Satellite A | Satellite B |
|---|---|---|
| Kuiper Belt | Pluto | Charon |
| 4.36 lightyears from the Sun | Alpha Centauri A | Alpha Centauri B |
Brightness Fluctuation
Sometimes, a binary system consists of a large dim star and a small bright one, causing fluctuations in brightness of the system. If the bright star is behind the dim one the system appears dim. If the bright star is in front of the dim one, the system has medium brightness. If the stars are next to each other, the system appears very bright.
References
- Astronomy: A Visual Guide by Mark A. GarlickTemplate:Astro-stub
ca:Sistema binari (astronomia) cs:Binární systém pt:Planeta binário