Venus now appears as Earth’s brilliant morning star, shining above the southeastern horizon before dawn. For early morning risers, the silvery celestial beacon rose predawn in a close pairing with […]

Cataloged as M1, the Crab Nebula is the first on Charles Messier’s famous list of things which are not comets. In fact, the Crab Nebula is now known to be […]

In the fading darkness before dawn, a tilted triangle appeared to balance atop a rock formation off the southern tip of Sicily. Making up the points of the triangle are […]

This is a gibbous Moon. More Earthlings are familiar with a full moon, when the entire face of Luna is lit by the Sun, and a crescent moon, when only […]

Dominated by dark matter, massive cluster of galaxies Abell 2744 is known to some as Pandora’s Cluster. It lies 3.5 billion light-years away toward the constellation Sculptor. Using the galaxy […]

The Crab Nebula is cataloged as M1, the first object on Charles Messier’s famous 18th century list of things which are not comets. In fact, the Crab is now known […]

There’s a new space telescope in the sky: Euclid. Equipped with two large panoramic cameras, Euclid captures light from the visible to the near-infrared. It took five hours of observing […]

It moved across the surface of Mars — what was it? A dust devil. Such spinning columns of rising air are heated by the warm surface and are also common […]

What was that red glow on the horizon last night? Aurora. Our unusually active Sun produced a surface explosion a few days ago that sent out a burst of electrons, […]

It was Halloween and the sky looked like a creature. Exactly which creature, the astrophotographer was unsure (but possibly you can suggest one). Exactly what caused this eerie apparition in […]