General astronomy

General astronomy

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General astronomy

meteoroid

Astronomy; General astronomy

A small object that is made up of rock or metal and travels in outer space. Most meteoroids are no bigger than a pebble.

neutron star

Astronomy; General astronomy

An object in space made of a very dense mass of neutrons. These are formed near the end of a star's existence, when the star's core collapses.

morning star

Astronomy; General astronomy

A planet, not a star, that can be seen in the east just before or at sunshine. The morning star is usually Venus or Mercury.

nebular hypothesis

Astronomy; General astronomy

An explanation of how the Solar System began. According to the nebular hypothesis, a spinning cloud of gas and dust cooled and then flattened into a disk.

nebula

Astronomy; General astronomy

A large cloud of gas in outer space. Nebulae provide the material from which stars form. They give off their own light.

planetary nebula

Astronomy; General astronomy

An expanding ring of glowing gas that surrounds a smaller, older star. When the gas has moved off into space, the star that is left is called as white dwarf star.