Life on a low gravity planets

A planet with lower gravity than earth would result in the development of very different life forms.

If the gravity is lower, the planet must necessarily be smaller and lighter than the earth. A smaller size also means that heat is dissipated faster than on earth, since as size decreases, the superficial area needed to radiate gets proportionally larger relative to volume.

Atmospheric density and pressure would probably be lower than on earth because there is less force pulling gases toward the planet, so the air would generally be thinner. Even the largest and fastest winds and waves would carry less energy than those on Earth.

One of the consequences of lower gravity is reduced pressure on the planet’s centers, implying greater difficulty in maintaining a molten core. This, with the reduced ability to preserve heat, results in less geological activity and in the presence of only a few large continents.

The planet would have many ridges and deep oceans. Low gravity together with poor geological activity would be less able to smooth the planet’s surface, so the landscape would generally be very diverse and irregular, with many valleys alternating with very high elevations.

Organisms evolving in such an environment would have to be built differently.