Tuesday, November 19, 2013

Escape velocity

Escape velocity is the speed needed to get free from the gravitational attraction of a celestial body without any additional propulsion.

Earth - facts 14

The escape velocity of the Earth is approximately seven miles per second. This is a little over 25,000 mph.

Monday, November 18, 2013

Kinetic energy

Kinetic energy is the energy an object has because of its motion.

Sun - facts 15

Light from the Sun takes approximately a little over eight minutes to reach the Earth.

Planets - facts 16

All of the planets in the Solar System have elliptical orbits.

Venus - facts 7

Venus is the only planet in the Solar System that rotates in a clockwise direction.

Stars - facts 7

Alpha Centauri C is the closest star to the Sun. It is approximately 4.2 light years away.