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
Coronal mass ejection

A vast cloud of hot plasma, mainly composed of electrons and protons, that is ejected from the surface of the Sun.


This is the apparent wobble of the Moon as it goes around the Earth. Libration allows us to see a little more than half of the Moon’s disc.

Dwarf spheroidal

A dwarf galaxy that contains few stars and hardly any gas. Most of the Milky Way’s satellites are dwarf spheroidals.

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