Ancient Chinese astronomer Shi Shen’s star catalog, known as The Star Manual of Master Shi, is now considered the oldest star ...

Astronomers measure distances to the stars in terms of light years, units that combine time and distance. One light year is the distance light travels in one year; so if you look at a star ten ...

They found that the ancient star chart actually dates to 355 B.C. — 250 years earlier than previously thought — and that it ...