Like ships on a never-ending expedition around the world, ESA’s four Cluster spacecraft continue to explore the mysterious magnetic environment that surrounds the Earth – a stormy sea filled with ...

The moon’s apparent absence on Sunday could offer skywatchers a look at a regular summertime visitor among the stars. On Aug. 4, the moon is expected to enter its new moon phase, when its shadowed ...

This week, let's take a look at a beautiful patch of sky located midway between the constellations Cassiopeia and Perseus. There we find a twin star cluster known as the Perseus Double Cluster.

Tonight and tomorrow night Comet Hartley 2 passes near the Double Cluster in Perseus, one of the prettiest deep sky objects in the sky. These two side-by-side star clusters, also cataloged by ...

The Double Cluster, Wild Duck open Cluster, and Coathanger asterism are on display in August. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. The ...

Galaxy clusters are formed by a dense packing of many galaxies, making them the most massive structures in the universe. Their progenitors, protoclusters, show these galaxies in their infancy, ...

Midway up in the northeastern sky after dark at this time of year lies the constellation of Cassiopeia. Seeing an ancient Ethiopian queen there will challenge your imagination, but finding five stars ...

The dark skies surrounding this weekend's new moon phase present an excellent opportunity to spot a trio of star clusters and stellar alignments embedded in the glowing band of the Milky Way. Star ...