Open star clusters are groups of stars in loosely-bound gravitational associations. The stars are further apart than the stars in their cousins, the globular clusters. The weak gravity from the loose clusters means open clusters take on irregular shapes. They usually contain only a few thousand stars.
The Hubble Space Telescope captured images of two clusters in the Large Magellanic Cloud.
Continue reading “Hubble Spots Two Open Clusters. One is Also an Emission Nebula”