double star

An artist's rendering of a potential companion to the Sun, which theorists believe evolved in the Sun's natal cluster and then was lost. If proven, the companion sun theory would add credence to theories that the Oort cloud formed as we see it today, and the ninth planet was captured rather than formed in its place. Qualifying: M. Weiss

Did the sun start life as half of a pair of twin stars?

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Harvard University scientists say the Sun may once have had a binary companion with a similar mass. If the theory is confirmed, the presence of an ancient companion star increases the likelihood that the Oort cloud formed as it is observed
A binary system when one of its components is a black hole. Illustration: Jesús Corral Santana - Technological Institute of the Canary Islands Spain

A black hole in a binary system has been found: it has a mass more than five times that of our Sun

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A double star system is flawed in that both members of the system are white dwarfs. Illustration: University of California at Santa Barbara

An Israeli researcher from the University of California shared the discovery of a double star system containing two white dwarfs

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Cosmic scene with DNA, stars, solvents and atomic circles in oral flow.

Is a dead star preparing for a supernova explosion threatening Earth? Astronomers say "maybe"

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