Scientists have found two new habitable planets, nearly 8 times ... GJ229A is 7.9 times the size of our planet while GJ180D is 7.5 times bigger. Their size is why scientists categorise them ...
Narrator: As the solar system grew, four rocky planets: Mercury, Venus, Earth and Mars, were created closest to the Sun. Made of rocks and metals, they have solid surfaces and a central core of ...