Comet SWAN25F, which was first seen by ESA's SOHO satellite, is thrilling skygazers with its striking green color. It is visible just before dawn on t ...

Point your eyes to the sky above the northeastern horizon in the Northern Hemisphere for the best chance to spot comet ...

Although Aldebaran is counted as part of the Hyades ... The eighth-brightest deep-sky object is the Coma Star Cluster (Melotte 111), an open cluster that lies some 280 light-years away.

This coma expands a great deal when it comes in close contact with the sun’s radiation. As the comet warms, parts of it go from a solid to a gas state, giving the comet a fuzzy appearance when seen ...

While establishing diplomatic relations with an alien race called the Cairn, Deanna's mother experiences a mental breakdown and falls into a coma, and it seems like Deanna ... civilization the choice ...

Initial observations suggest the comet, called C/2025 F2 (SWAN), will continue getting brighter as it approaches the sun.

Here's an observers' guide to the newly discovered Comet 2025 F2 (SWAN), which is visible in northern skies right now.

The comet was discovered by Australian amateur astronomer Michael Mattiazzo in late March. It was photographed on April 6 at magnitude 8.4 with a bright green coma and a thin tail, reported by Sky ...

Rosetta had gathered its data inside the comet’s coma—a cloud of gas and dust. That dust turned out to be a problem. It carried water ice rich in deuterium, which skewed the readings.