Astronomy for Beginners

Here’s where you’ll find observing guides, how-to articles and great astronomy hints and tips. Don’t forget to also check out our comprehensive astronomy dictionary.

Astronomy Dictionary
Ghost crater

These are craters who have been infilled, buried or submerged by geological processes but are sometimes still just visible on the surface of a planet or moon.

Planetoid

Another term for a minor planet – the official name for asteroids, as used by the International Astronomical Union (IAU).

Main sequence star

A main sequence star is one that is in a stable part of its life converting hydrogen and helium through nuclear fusion. Most stars we see in the night sky are in the main sequence stage and our Sun is currently also a main sequence star.

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