The “Binary” hypothesis was put forth by Russell (1937) who believed in the existence of many stars as pairs in the universe.

Our solar system was born from one of these star pairs which consisted of the sun and another smaller star known as the companion star.

A huge-sized third star came into the region of this paired stars and caused tidal explosion in the companion star which was completely disrupted, When the third star came close to the companion star some parts of the companion star, were carried away along with the third star which eventually receded away. The rest fell into the sun’s gravitational control, these parts retained by the sun revolved round it and gradually cooled down to form the planets.

The double star hypothesis of the solar system was propounded by Lyttleton (1938), who also believed the birth of the earth and other planets and satellites of the solar system in nearly the same way as Russell did. According to him, the companion star of the sun was at some distance as equal to the distance of the planets Saturn or Uranus from the sun.