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Relating to any large system of stars held together by mutual gravitation and isolated from similar systems by vast regions of space.

Contributors in Galaxy



Astronomy; Galaxy

A galaxy is a massive, gravitationally bound system that consists of stars and stellar remnants, an interstellar medium of gas dust, and an important but poorly understood component tentatively ...

black hole

Astronomy; Galaxy

A black hole is the circular dark space that sits at the center of a galaxy which absorbs everything including light so nothing can be reflected or escaped from it. Around a black hole there is a ...


Astronomy; Galaxy

American astronomer who showed that there are galaxies beyond our own and that they are constantly moving outwards from ours.

Magellanic Clouds

Astronomy; Galaxy

Two small galaxies that are the galaxies closest to the Milky Way. These are faintly visible in the night sky of the Southern Hemisphere.


Astronomy; Galaxy

A very bright, star like object that is extremely far away from the Earth. A quasar produces several thousand times as much energy as the entire Milky Way galaxy.

asteroid number

Astronomy; Galaxy

Asteroids are assigned a serial number when they are discovered; it has no particular meaning except that asteroid N+1 was discovered after asteroid N

active sun

Astronomy; Galaxy

The Sun during its 11-year cycle of activity when spots, flares, prominences, and variations in radiofrequency radiation are at a maximum.

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The first jorney of human into space

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