Look north this evening a couple hours after sunset and you’ll easily spot the large shape of the Big Dipper as it sits upside-down in the sky, appearing to pour from its cup into that of the smaller ...

In March of 1989, a highly active sunspot region released multiple extreme solar flares, including an X4.5 flare on March 10 and a M7.3 flare on March 12. Solar flares are ranked as B, C, M, and X ...

The Sun, along with more than 1,500 other stars, journeyed from the middle of the Milky Way to its current position a few billion years ago.

The Galilean moon Callisto disappears behind Jupiter in an occultation early this morning. The catch is that the event is only visible from the western half of the U.S., but observers farther east can ...

From Mars, Earth transits the Sun four times in a 284-year cycle. The transits occur in either May or November at intervals of 100.5, 79, 25.5, and 79 years. During these events, Earth and the Moon ...

It’s often said that nonastronomers recognize three celestial objects: the Moon, the rings of Saturn, and Halley’s Comet. History’s first identified periodic comet, 1P/Halley, returned to the night ...

Io transits Jupiter’s broad disk late tonight, beginning at midnight EST. On the East Coast, Jupiter is still 40° high in the west at local midnight, readily visible as the brightest point of light in ...

To many of you, Observable Space — formerly PlaneWave — needs no introduction. Starting as a breakaway from Celestron in southern California in 2006, PlaneWave was founded by Rick Hedrick and Joe ...

A total lunar eclipse, sometimes called a Blood Moon, occurs over much of the world this morning, including the U.S. Total lunar eclipses can only take place during the Full Moon. Full Moon officially ...

In this episode, Astronomy magazine Editor Emeritus Dave Eicher invites you to head out on the evening of March 8 to see a close grouping of two planets. This time, brilliant Venus — the ...

The nearly Full Moon passes just 0.4° north of Regulus at 8 A.M. EST; you can catch the pair close together in the predawn sky, standing roughly 20° high in the west two hours before sunrise. The Moon ...