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
Penumbra (lunar eclipse)

This is the out lighter part of the Earth’s shadow cast out into space. It is the first part of the Earth’s shadow that the Moon enters at the beginning of a lunar eclipse.

Oort Cloud

This is a vast cloud of small icy bodies that envelops the Solar System. It is thought to contain trillions of objects and resides 30 trillion kilometres from the Sun.

Lightyear

A unit of measurement equal to the distance travelled by light in a year, that’s 9.46x10^12km. (5.88x10^12 miles).

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