The hypothesis, which says lightning struck the earth causing tiny organic molecules to join and form living organisms, is historically known as

Oparin-Haldane hypothesis. The Oparin-Haldane hypothesis is named after the two scientists; Russian scientist Aleksandr Oparin and English scientist J. B. S. Haldane. The two scientists separately hypothesized that life began when some inorganic molecules were converted into organic molecules specifically amino acids by the help of energy came from a lightning struck.

Gravitational force i believe