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Astronomical Unit (AU) Distances

Constellations Guide

Cosmic Distance Scale

Lunar Phases

Parts of a Comet

Pioneer and Voyager Golden Records

Notable Black Holes

Types of Nebulae

Solar System Explorers

The Big Bang Theory

The Hertzsprung-Russell Diagram

Lunar Phases

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Full Moon

The entire face of the Moon is illuminated, visible throughout the night.

New Moon

The Moon is not visible from Earth as it is aligned with the Sun.

First Quarter

Half of the Moon's disk is illuminated on the right side, visible in the southern sky.

Waxing Gibbous

More than half of the Moon's disk is illuminated on the right side, visible throughout most of the night.

Waning Crescent

A sliver of the Moon's disk is illuminated on the left side, visible in the eastern sky before dawn.

Last Quarter

Half of the Moon's disk is illuminated on the left side, visible in the eastern sky.

Waxing Crescent

A sliver of the Moon's disk is illuminated on the right side, visible in the western sky.

Waning Gibbous

More than half of the Moon's disk is illuminated on the left side, visible after midnight into the morning.

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