7 interesting facts about earth 1. Earth is the only known planet with life – While scientists search for extraterrestrial life, Earth remains the only planet where life is confirmed. 2. 70% of Earth's surface is covered in water – Most of this is saltwater in oceans, with only about 3% being freshwater. 3. Earth has a dynamic atmosphere – The atmosphere protects us from harmful solar radiation and regulates temperature. 4. The planet's core is as hot as the Sun – The Earth's inner core can reach temperatures of about 5,500°C (9,932°F). 5. Earth is not a perfect sphere – It bulges slightly at the equator due to its rotation, making it an oblate spheroid. 6. A day isn’t exactly 24 hours – It actually takes about 23 hours, 56 minutes, and 4 seconds for Earth to rotate once. 7. Earth has a powerful magnetic field – Created by the movement of molten iron in the core, this field protects us from solar winds.