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www.reference.com/article/earth-support-life-5fd50bdfdc547b7

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 Milky Way capable of supporting life.

www.reference.com/article/many-planets-d340b12d592212c7

As of 2014, there are eight planets in Earth's solar system. In order by distance to the sun, the planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Pluto was considered to be a ninth planet until 2006, when it was demoted to a dwarf planet.

www.reference.com/article/planets-made-84c007560127d38f

The inner planets, Mercury, Venus, Earth and Mars, are made up of silicate rock and heavy metals such as iron and nickel, whereas the outer planets, Jupiter, Saturn, Uranus and Neptune, are made up mostly of gases, according to Universe Today. The outer planets are subd...

www.reference.com/article/can-mars-support-life-b5265d9033920502

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.

www.reference.com/article/type-planet-earth-bde776145ac4de8

According to Encyclopædia Britannica, Earth is classified as a terrestrial planet. A terrestrial planet is rocky, in contrast to the predominantly gas planets found in the outer solar system.

www.reference.com/article/atmosphere-support-life-earth-34140666b74ba564

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 atmosphere is composed of the troposphere, the tropop...

www.reference.com/article/can-uranus-support-life-4ea3fd3e8b7096be

As of 2015, the planet Uranus cannot support life as it is known on Earth. However, it is not impossible for this ice giant to sustain other life forms that can withstand its harsh environmental conditions, which are vastly different from those on Earth.