Astronomers measure a star’s brightness using the apparent magnitude system, where lower values indicate brighter stars.

But could humans or spacecraft ever reach Alpha Centauri, the closest star system to our planet? Alpha Centauri is about 4.4 ...

Only the three-star Alpha Centauri star system ... This chart shows the constellation of Ophiuchus (the Serpent-Bearer), which straddles the celestial ... [+] equator. The chart shows the location ...

The closest star system to the Sun is the Alpha Centauri system. Viewed face-on, grand spiral galaxy NGC 5643 has a festive appearance in this colorful cosmic portrait. This rare structure is known as ...