If the Moon was Replaced by the Planets
This is a simple video representing the relative sizes of the planets in our solar system.
Reinventing Space Flight
This video and text about re-inventing space flight comes from SpaceRip. Lots more of their interesting video content on YouTube.
Phil Plait: How to defend Earth from asteroids
What’s six miles wide and can end civilisation in an instant? An asteroid — and there are lots of them out there.
There are some very favourable passes over the next few days which you might want to check out...
Hubble's Time Tunnel
Interesting short film on the objectives of the Hubble Telescope Is time travel possible?
A video that logs some of the great discoveries that have been made by the Hubble telescope.
The Ultimate Guide to Black Holes
This is a full length documentary (45 minutes) about black holes made and televised by National Geographic Channel.