Cassiopeia (pronounced kass ee oh pee’ uh) ... The first target on our list is both famous and difficult to see well: the Bubble Nebula (NGC 7635).

Over 2 decades of Chandra X-ray Observatory views of the Crab Nebula and Cassiopeia A have been time-lapsed. The Chandra team explains here. Credit: NASA/CXC/A. Hobart. More for You.

SNR G107.5-5.2 Unexpected Discovery (The Nereides Nebula in Cassiopeia) by Marcel Drechsler, Bray Falls, Yann Sainty, Nicolas Martino and Richard Galli ...

A new study has described in detail a dying star initially recorded in 1181. The object may belong to a rare class of supernovas that leaves behind a “zombie star.” ...

Eskimo Nebula: Stars like the Sun can become remarkably photogenic at the end of their life. A good example is NGC 2392, located about 4,200 light years from Earth.

That’s what happened in Pa 30 Nebula’s case, and some of the results are unique among known nebulae. At its core, a remnant of its birthing star remains, with a surface temperature of 360,000 ...

The nebula, a cloud of material ejected from the supernova, was named Pa 30. Then, in 2023, astronomers spied weird filaments glowing with light from sulfur within the nebula.

Finally, in the April 2025 session, MISTRAL observed – through two cross-scans of about half an hour each – the supernova remnant Cassiopeia A (Cas-A), one of the most intense radio sources in ...

This composite telescope image of Cassiopeia A from January 2024 contains X-rays from Chandra (blue), infrared data from Webb (red, green, blue), and optical data from Hubble (red and white).