Variable star
Videos
A variable star is a star whose brightness as seen from Earth changes systematically with time. This variation may be caused by a change in emitted light or by something partly blocking the light, so
Comparison of VLT-SPHERE images of Betelgeuse taken in January 2019 and December 2019, showing the changes in brightness and shape. Betelgeuse is an intrinsically variable star.
A photogenic variable star, Eta Carinae, embedded in the Carina Nebula
Herbig Ae/Be star V1025 Tauri and surrounding molecular nebula
Artist's impression of a large dust cloud in the envelope of R CrB
Open cluster
Videos
An open cluster is a type of star cluster made of tens to a few thousand stars that were formed from the same giant molecular cloud and have roughly the same age. More than 1,100 open clusters have be
The Pleiades is among the nearest open clusters to Earth
Mosaic of 30 open clusters discovered from VISTA's data. The open clusters were hidden by the dust in the Milky Way. Credit ESO.
The star cluster NGC 3590
NGC 265, an open star cluster in the Small Magellanic Cloud