Earth (Planet)
Earth is the third planet from the Sun and the only astronomical object known to harbor life. According to radiometric dating and other sources of evidence, Earth formed over 4.5 billion years ago. The Solar System Mercury Venus Earth (this) Mars Jupiter Saturn Uranus Neptune
| Links | https://en.wikipedia.org/wiki/Earth |
About/Subject 6
 | La terra | Hardback |
 | The Encyclopaedia of Ignorance | Soft cover |
 | Планета Земля | Paperback |
 | Analog: Science Fiction/Science Fact (March 30,1981) | Magazine |
 | I Wonder Why the Wind Blows and other questions about our planet | Paperback |
 | Scientific American (December 1994) | Magazine |