A slender, day-old moon is an irresistible sight low in the western twilight sky on Feb. 19, 2015. Most of the rest of the moon is faintly lit by light reflected from Earth, called earthshine. We'll ...

This month’s edition of our night sky guide marks the one year anniversary of our astronomy column.

There's one good thing about the current cold wave — clear nights. I can understand how piling on clothes and walking into the stinging, subzero darkness might be the last thing on your mind. But I'm ...