Moon

Moon

The Earth's only natural satellite. The moon has a cold, dry orb covered with many lunar craters and strewn with rocks and dust. The moon has no atmosphere. But recent lunar missions have found plenty frozen water on the moon.

Industry: Astronomy

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Moon

waxing Moon

Astronomy; Moon

The period of the Moon's monthly cycle as it moves from a new Moon to a full Moon, increasing in visibility with respect to an Earth-bound observer.

young crescent Moon

Astronomy; Moon

Term used to denote the initially visible crescent of the Moon immediately after the new Moon.

zenith

Astronomy; Moon

The imaginary point directly above an observer on Earth (opposite of nadir).

albedo

Astronomy; Moon

A unit-less measure that refers to the how much an object diffusely reflects light from the sun. Albedo is determined by measuring the ratio between the light reflected and the light shining on an ...

angular diameter

Astronomy; Moon

The diameter of a distant object as measured by the angle formed from a point representing an observer and the outer edges of the object.

visual diameter

Astronomy; Moon

The diameter of a distant object as measured by the angle formed from a point representing an observer and the outer edges of the object.

annular eclipse

Astronomy; Moon

An solar eclipse where the Moon is between the Sun and the Earth, but with the Moon appearing smaller than the Sun to the observer, leaving a bright ring around the circumference of the Moon. An ...