Mars is the focus of much speculation and scientific study about possible human colonization. Its surface conditions and the likely availability of water make it arguably the most hospitable of the planets, other than Earth. Mars requires less energy per unit mass (delta V) to reach from Earth than any planet except Venus. However, at minimum energy use, a trip to Mars requires 6–7 months in space using current chemical propulsion methods.

Weird Alien Worlds Beyond Our Solar System:http://youtu.be/ofxY-mb503Y

Black Holes And The Faith of Our Universe:http://youtu.be/SvaeuL8tamw

The Cosmos:Narrated By Morgan Freeman:http://youtu.be/s1f4AoMkN0g

Biggest Most Complex Machine in History:http://youtu.be/ttoahynG184

Lightning Sprites at the Edge of Space:http://youtu.be/pYVr2XH_1FU

Biggest Things in The Universe:http://youtu.be/qsc4kzYpmkQ

Killer Asteroids in Our Universe:http://youtu.be/SQZ7AH09J5w

Wild and Destructive Weather:http://youtu.be/v5E06fg1y2Q

Hubble:Exploring the Universe:http://youtu.be/CW2d32Go7yk

Hubble:Exploring the Milkyway:http://youtu.be/iR-cnY-Rq7Q

Neil Armstrong the First Human on The Moon:http://youtu.be/yqQgrGQnYQM

Aftermath When The Earth Stops Spinning:http://youtu.be/xiqCowa0iQo