GENERAL KNOWLEDGE

Detailed explanation-1: -With Harold Jeffreys he developed the tidal hypothesis of the origin of the planets, which, in the 1920s and 1930s, led to a sharp decline in optimism among professional astronomers about the prospects for life beyond the Solar System. Jeans himself wrote (in The Universe Around Us):

Detailed explanation-2: -The second theory, the tidal theory, was first proposed by Jeans (1916). This postulated that the passage of a massive star past the Sun would raise a huge solar tidal bulge from which matter would escape in the form of a filament.