Earth

 

• The earth is the only planet known to have life (geological activity) in the universe.
• Earth is the third planet from the sun and the fifth largest of the eight planets in the solarsystem.
• The earth rotates once in 24 hours about an imaginary axis that passes through its north and south poles. The day and night on the earth occur due to this rotation.Earth radius is 6371Km.
• The earth completes its journey around the sun in 365.25 days.With 29.78Km/s speed.
• The axis of rotation of the earth with respect to its orbits plane is tilted by an angle of 23.5.This tilt causes changes in seasons on the earth.It has one natural satellite is called moon.