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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


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.

Atacama Large Millimeter/submillimeter Array (ALMA)

Astronomy; Galaxy

A space observation system that consists in an array of large 40-foot (12-meter) radio telescopes installed in the Atacama desert of northern Chile. The high precision telescopes, 66 initially, are ...

Gravitational lens

Astronomy; Galaxy

Refers to a distribution of matter (such as a cluster of galaxies) between a distant source (a background galaxy) and an observer, that is capable of bending (lensing) the light from the source, as ...

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

Neutron star

Astronomy; Galaxy

A remnant star of a supernova explosion with an approximate size of the sun or larger , in which gravity has caused all matter to collapse into a giant nucleus composed only of neutrons. The collapse ...

Black hole

Astronomy; Galaxy

An extremely compact star which has collapsed by enormous gravitational pull to overcome electric and nuclear forces. Black holes are usually formed with stars much larger than the sun as they ...

Stellar evolution

Astronomy; Galaxy

The complete developmental stages in the lifetime of a star from its formation out of gas and dust to the time when its nuclear fuel is exhausted. Based on this stellar evolution model, the Sun is at ...

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