91色情片

Earth

Second well on the way to cap Deepwater Horizon

Capping the flow of oil from the stricken rig by drilling another well is a huge technical challenge, but it has to work

Earth

Oil spills: what to do when all else fails

Humans

Women and children first? How long have you got?

Spectacular Earth Impact Craters

Space

Asteroid attack: Putting Earth’s defences to the test