ESA's Euclid mission is exploring the "dark universe." The space telescope's latest images offer fascinating new insights.

If you think a telescope is better for astronomy than stargazing with binoculars, then you're misunderstanding the nature of the night sky. It's in 3D, has depth and contains objects of vastly ...

Seven planets are aligning in the night sky this week, creating a brief chance to see a "planetary parade." Worldwide, the best day to see the alignment is today, Feb. 28. Mercury, Venus ...