NASA's ShadowCam instrument on the Danuri lunar orbiter has sent back its 1st image. It shows details inside a permanently shadowed crater on the moon.
Could there be microbial life on Io? Jupiter's hostile volcanic moon seems an unlikely home, but astrobiologist Dirk Schulze-Makuch says it's not impossible.
NASA's Curiosity rover has found water-rich opal on Mars. Its presence indicates that there was an extensive and potentially habitable subsurface environment.
Astronomers have discovered the Milky Way's farthest stars in our galaxy's huge stellar halo. The most distant stars are almost halfway to the Andromeda galaxy.
Binary stars - a star system consisting of two stars - are extremely useful. They give all the information needed to measure mass of a star. Here is how.
What is a variable star? It's a star that brightens and dim in a cycle that might last hours, or weeks, or months, or longer. Astronomers know millions!