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
Supernova

The explosive end to a high-mass star’s life, when it has consumed all its fuel and can no longer support itself against its own gravity. It subsequently contracts and then explodes, expelling its outer layers into space.

Astronomical Unit (AU)

One AU is a unit of distance equivalent to roughly 150,000,000 km.

Apparition

The period during which a planet is best placed for observation.

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