Earth supports life because it is the correct distance from the sun, its composition is rock, it has a molten core, it gains protection from its atmosphere and it has water. There are approximately 500 planets in the Mil... More »

The atmosphere supports life on Earth by protecting it from dangerous electromagnetic radiation, by creating and controlling weather and climate and by providing the gases that plants and animals need to breathe. The atm... More »

Scientists have not yet proven that Mars can currently support life as we know it on Earth. Based on data from the NASA Exploration Rover, Mars may have been able to support life approximately 4 billion years ago. More » Science Astronomy Planets

The sun provides the Earth with energy in the form of heat, which it uses to warm the Earth's surface, oceans and atmosphere. The heat energy found in the atmosphere is one of the major components of the Earth's climate ... More »

According to astrobiologist Jack O'Malley-James of the University of St. Andrews in Scotland, the sun will grow large enough to extinguish all life on Earth in roughly 2.8 billion years. The planet's non-microbial life w... More »

Bodies of water on Earth are maintained by the atmosphere keeping the water cycle of evaporation, condensation and precipitation functioning so that water can be replenished. Also, the gravitational pull of the Earth kee... More »

Although science can't say for sure, ice ages are thought to be triggered by the interaction between the height of the continents, the circulation of the ocean, the distance of Earth from the sun, the atmosphere's compos... More »