Because on most planets (mars being an exeption as there are places where water can stay liquid) temperature and/or atmospheric pressure is to high or low for water to stay liquid.
The earth is in what astronomers call the 'Goldylocks Zone': Just the right distance from our sun that liquid water can exist.
Earth.The Earth is about 70% covered with water. We can't be too sure about other planets, although Mars and Mercury are certainly dry, and Venus is too hot for water to remain liquid.
earth
The Sun is not a planet. It is a star. The Earth has gas on it, but it is not gaseous compared to the planets defined as gaseous. So your answer would be no the Sun and the Earth are not gaseous planets.
Earth is the only known planet with liquid water.
Because of Earth's size, and considering it as one of the smallest planets, it has a weak gravity compared to the OTHER planets. Most planets have greater gravity because of their size. Earth has a stronger gravity compared to mars, mercury, and venus.
http://solarsystem.NASA.gov/planets/compchart.cfm
Earth!
3rd
Earth's moon is relatively large compared to the moons of other planets in the solar system. It is the fifth-largest moon in the solar system. Compared to the size of Earth, the moon is about 1/6th the diameter of Earth.
no, not compared to other planets around us. Think about it.
It explains why the planets remain in in orbit around the sun. Also, why moons orbit their planets. It also explains why humans remain on earth.