By Sean Martin
- Nasa chief technologist: Mars is first step in humanity's permanent migration into solar system
- Once in a blue moon: July set for first month with two full moons since 2012
- ESA asteroid mission gentler than Nasa's and plans to deflect Earth threatening rocks
- Namibian seal cull: 80,000 seals pups to be massacred in 'cruellest slaughter in the world'
- When will Yellowstone supervolcano erupt again? Scientists might have worked it out