Star cluster
Videos
A star cluster is a group of stars, that share an origin, formed at roughly the same time and held together by self-gravitation. Two main types of star clusters can be distinguished: globular clusters
Messier 44, a cluster in the constellation of Cancer
The Pleiades, an open cluster dominated by hot blue stars surrounded by reflection nebulosity
The embedded Trapezium cluster seen in X-rays which penetrate the surrounding clouds
The globular cluster Messier 15 photographed by HST
Star
Videos
A star is a luminous spheroid of plasma held together by self-gravity. The nearest star to Earth is the Sun. Many other stars are visible to the naked eye at night; their immense distances from Earth
Star cluster
…A star cluster is a group of stars, that share an origin, formed at roughly the same time and held together by self-gravitation. Two main types of star clusters can be distinguished…
The Sun, a G-type main-sequence star, the closest to Earth
A star-forming region in the Large Magellanic Cloud
Stars in the night sky
Spitzer Space Telescope infrared image showing a multitude of stars in the Milky Way galaxy