WD 0145+234
Videos
WD 0145+234 is a white dwarf star approximately 96 ly from Earth in the constellation of Aries that has been associated with studies suggesting that a very large exoasteroid near the star was substant
Artistic representation of Exoasteroid disrupted by star
Black hole Messier 87
Esa hubble k 2 18a impression
Dwarf nova
Videos
A dwarf nova, or U Geminorum variable, is one of several types of cataclysmic variable star, consisting of a close binary star system in which one of the components is a white dwarf that accretes matt
Dwarf nova HT Cas seen in outburst (mag ~13.4) on November 2, 2010
Light curve of eclipsing dwarf nova HT Cassiopeiae during outburst, showing eclipses and superhumps (SU Ursae Majoris type)