Universe

What everybody ought to know about a star!

A star is a luminous sphere of plasma held together by its own gravity. The nearest star to Earth is the Sun. Many other stars are visible to the naked eye from Earth during the night, appearing as [ … ]

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 [ … ]

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 Toby Jug Nebula in the constellation of Carina

IC 2220, also known as the Toby Jug Nebula, is a reflection nebula located 1200 light years away in the southern constellation of Carina.   What is the constellation of Carina? Carina is a constellation in the [ … ]

Brown dwarfs are simply amazing

Brown dwarfs are substellar objects that occupy the mass range between the heaviest gas giant planets and the lightest stars.   What are brown dwarfs? Unlike the stars in the main-sequence, they are not massive enough to [ … ]

The Blue Horsehead Nebula, a stunning reflection nebula

IC 4592 (also known as the Blue Horsehead Nebula) is a reflection nebula in the Scorpius constellation that is lit by Nu Scorpii. What is a reflection nebula? In astronomy, reflection nebulae are clouds of interstellar dust which might reflect the light of a [ … ]

The Cygnus Loop, a supernova remnant

The Cygnus Loop  or Sharpless 103 is a large supernova remnant  in the constellation Cygnus, an emission nebula measuring nearly 3° across. Some arcs of the loop, known collectively as the Veil Nebula or Cirrus Nebula, emit in the [ … ]