Astronomical Dictionary Page #5

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Magnitude

The degree of brightness of a celestial body designated on a numerical scale, on which the brightest...

Magnitude

Meteor

Also known as a "shooting star" or "falling star", is a bright streak of light in the sky caused by ...

Meteor

Meteorite

A stony or metallic object from interplanetary space that impacts a planetary surface....

Meteorite

Minor Planets

This term is preferred by astronomers, and is synonomous with the term asteroid. ...

Minor Planets

Moon

A naturally occurring satellite, or relatively large body, orbiting a planet. ...

Moon

Magma

Molten rock material (liquids and gases)....

Magma

Mantle

The main bulk of a planet between the crust and the core; on Earth, the mantle ranges from about 40 ...

Mantle

Mare

A dark, low-lying lunar plain, filled to some depth with volcanic rocks....

Mare

Mars

Planet fourth in order from the sun. In Roman mythology, god of war and discord (Greek name, Ares)....

Mars

Massif

A massive topographical feature, commonly formed of rocks more rigid than those of its surroundings....

Massif

Mead

Margaret Mead (1901-1978) American anthropologist, author and lecturer on contemporary social issues...

Mead

Mercury

The planet closest to the sun. In Roman mythology, the fleet-footed messenger god and escort of dead...

Mercury

Mimas

In Greek mythology, a giant....

Mimas

Morphology

The study of structure or form....

Morphology

Mylitta

In ancient Phoenicia, a moon goddess who presided over fertility and childbirth....

Mylitta

Nebula

A term used to describe celestial objects which have a fuzzy, or nebulous, appearance (from the Lati...

Nebula

Nova

Literally, a new star. An existing star which suddenly increases its brightness by more than 10 magn...

Nova

Navka

Arab mother-goddess....

Navka

Neptune

Planet eighth in order from the sun. In Roman mythology, god of the sea (Greek name, Poseidon)....

Neptune

Nucleus

The frozen core of a comet which contains almost the entire cometary mass and is located in the come...

Nucleus

Occultation

This is when one celestial body, passes in front of, and obscures, another. This refers to the sam...

Occultation

Open Cluster

A group of young stars, possibly bound together by gravity. Over 750 of them have been recorded. It ...

Open Cluster

Opposition

A planet is said to be "in opposition" when it appears opposite the Sun in the sky. For the outer pl...

Opposition

Optical Binary

Not a true binary system; two stars which appear in alignment from the perspective of the Earth ...

Optical Binary

Orbit

The path of one body around another due to the influence of gravity. For two-body systems, the possi...

Orbit
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