Mars is considered to be earth’s twin planet.

Rotational speed of Venus is extremely slow.

Water is one of the most important prerequisites of life.

Earth and Mars are the right size to hold a sufficient-sized atmosphere.

Mars is denser compared to Venus

The terrestrial planets get too much sunlight for life while the Jovian planets get too little.

Atmosphere is important to the existence of organisms because it contains gases such as carbon dioxide and oxygen which are very useful for organisms’ growth and survival.

Hydrosphere aid in the proliferation of life because it serves as ways for transportation and it protects us from the sun’s radiation.

Presence of water, breathable atmosphere and energy from the sun are the only requirements for a planet to be habitable.