Looking for a sky event this week? Check out our full Sky This Week column. October 18: Io, Europa, and their shadows cross ...

Sky This Week is brought to you in part by Celestron. Friday, October 17The Summer Triangle is now sinking in the west late ...

A waxing crescent Moon (8% illuminated) will be observable in the western sky shortly after sunset. Mars (magnitude 1.6) will be visible approximately 7° to the upper left of the Moon, potentially ...

Wondering if it's a full moon tonight or if the planet Venus and Regulus star will be visible again today? Here's what to know about this weekend's celestial events. Tonight's waning crescent moon ...

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. After spending the last six months in the evening sky for ...

A new moon is when the moon shares the same celestial longitude as the sun; the two bodies are said to be in conjunction.