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.
Hubble's Time Tunnel
Interesting short film on the objectives of the Hubble Telescope Is time travel possible?
Psychology of an Astronaut
In astronomy we often focus on the cosmos and observing the cosmos from here on Earth or by using unmanned space craft.