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=== Binary Star ===
A [[Astronomical Terms Database#Star System|system of two stars ]] [[Orbit|orbiting ]] around a common centre of mass due to their mutual [[Gravity|gravity. ]] Binary stars are twins in the sense that they formed together out of the same interstellar cloud. See also [[Astronomical Terms Database#Star System|“Star System,”]] below; compare [[Astronomical Terms Database#Optical Binary|“Optical Binary,”]] below.
=== Blue Moon ===
=== Dwarf Star ===
A [[Star|star, which ]] that lies on the main sequence and is too small to be classified as a giant star or a supergiant star. For example, the [[Sol|Sun ]] is a yellow dwarf star.See also the [[Star Classification Table|Star Classification Table.]]
=== White Dwarf ===
A whitish [[Star|star, ]] of up to 1.4 Solar masses, and about the size of the [[Earth ]] with consequential very high density, characterized by a high surface temperature and low brightness.
=== Worm Hole ===
