Initially, the astronomer who first made note of this fuzzy-looking glowing cluster thought it might be a nebula. But it’s ...

Bright stars visible during May mornings include Arcturus in the west; Vega nearly overhead; with nearby Altair and Deneb completing the Summer Triangle; Antares in the southwest; and Fomalhaut rising ...

Telescopes provide closeup views of Jupiter and its four largest moons discovered by Galileo, and of Mars. Although Mars is ...