Our atmosphere is so very thin, and we're changing its mixture of gases with our activities.

CNN: 'The Science Guy' says: 'Save the Earth'

It wasn't until 2007 that Strobel discovered that the fungus emitted a remarkable mixture of volatile gases.

FORBES: Energy & Genius

Venus is a twin to the Earth in terms of size and mass, yet has evolved in a very different direction, with a surface temperature hotter than a kitchen oven and a choking mixture of noxious gases for an atmosphere.

BBC: Venus mission is on

Most asteroids are made of rock, while comets can be a mixture of rock, organic molecules and frozen gases.

BBC: Asteroid impact centre site selected