1) Because they don't have gravity and they don't have the atmosphere that the earth has. So we cant live in the three planets.
2) Because it also gives us vitamins. And the plants around us needs light to grow.
3) No because without the atmosphere that surrounds the earth we might be burned beacuse of the heat the sun radiates. The atmosphere blocks the dangerous rays to enter the earth.
4) Oxygen - without them we can't live
Gravity - it helps us not to float and let us walk on the earth
Atmosphere - it helps us from the dangerous rys of the sun.
Absorbed sunlight is balanced by heat radiated from Earth's surface and atmosphere. ... The atmosphere and the surface of the Earth together absorb 71 percent of incoming solar radiation, so together, they must radiate that much energy back to space for the planet's average temperature to remain stable.
Earth receives about 1/2,000,000,000 of the Sun's radiant energy production. The average amount of solar radiation reaching Earth's orbit (top of the atmosphere) and falling on a flat surface perpendicular to the Sun's rays at that distance is about 2 calories per square centimeter per minute.
the amount of heat received from the sun is just right to support life
The Earth is a rotating sphere that orbits the Sun. The axis of rotation of the Earth is at a constant tilt with respect to its orbit around the Sun, thus resulting in the change of seasons. Iron and oxygen make up 65% of the Earth's mass. The Earth also has gravity and magnetic force fields.
to support life?...