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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


Crab nebula

Astronomy; Galaxy

A cloud-like nebula observed in the Crab constellation which is the remnant of a supernova explosion observed in China in 1054. It contains a very young and rapidly spinning pulsar or the remnant of ...

Alien particles

Astronomy; Galaxy

Space matters that make their way to the Earth from other parts of the galaxy outside of the solar system. The solar system inside the Milky Way is surrounded by the heliosphere which is the boundary ...

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