On Tuesday, February 17, an annular eclipse of the Sun will occur. Here’s the catch, though: It will only be visible as annular along a thin line in Antarctica. From the southern tips of Chile and ...

Earth and Mars are constantly moving, but don’t stay a constant distance apart. Plus, spacecraft don’t travel in a straight line to their destination.

Visible in Scorpius before dawn, our waning satellite is close to the 3rd-magnitude star Pi (π) Scorpii and less than 8° from Antares, the Scorpion’s bright red heart. The Moon will pass 0.7° south of ...

Last Quarter Moon occurs at 7:43 A.M. EST on Monday, February 9. This phase is best viewed in the early-morning hours; early risers can catch it before dawn, and our satellite remains visible in the ...