NGC 2207 and IC 2163 about 80 million light-years away

NGC 2207 and IC 2163 are a pair of colliding spiral galaxies about 80 million light-years away in the constellation Canis Major.   What are NGC 2207 and IC 2163? NGC 2207 and IC 2163 were discovered by John Herschel in [ … ]

The Dumbbell Nebula, a popular observing target

The Dumbbell Nebula (also known as Apple Core Nebula, Messier 27, or NGC 6853) is a planetary nebula in the constellation Vulpecula, at a distance of about 1,360 light-years.   What is the Dumbbell Nebula? The Dumbbell Nebula object was the [ … ]

What everybody ought to know about a white dwarf!

A white dwarf, also called a degenerate dwarf, is a stellar core remnant composed mostly of electron-degenerate matter. A white dwarf is very dense: its mass is comparable to that of the Sun, while its volume is [ … ]

Pluto in the Kuiper belt in the Solar System

The Kuiper belt, sometimes called the Edgeworth–Kuiper belt, is a circumstellar disc in the Solar System beyond the (known) planets, extending from the orbit of Neptune (at 30 AU) to approximately 50 AU from the Sun.   What is the Kuiper belt? It is [ … ]

N44 located in a satellite galaxy of the Milky Way

N44 is an emission nebula with superbubble structure located in the Large Magellanic Cloud, a satellite galaxy of the Milky Way in the constellation Dorado.   What is the emission nebula N44? Originally catalogued in Karl Henize’s “Catalogue of H-alpha emission stars [ … ]