Viking The First Spacecraft to Land on Mars

35 years ago today, Viking 1 departed to Mars.

Eleven months later, it showed the sand, rocks and sky of the legendary Red Planet for the first time:

Source:
http://gizmodo.com/5618179/viking-the-first-spacecraft-to-land-on-mars

20 Things You Didnt Know About Light

The first light in the universe, the light used to push spacecraft, and the light produced by kicking the head of a walrus.

Source:
http://discovermagazine.com/2010/mar/20-things-you-didn.t-know-about-light