Planetary alignment happening in February: Planets make 'string' across California skies
Take advantage of a special 6-7 planet alignment from Earth's perspective. Planets 'line up' in the skies over California in February.
Spacefarers may contaminate other worlds – but scientists have plans to keep the cosmos clean
The US wants to put a flag on Mars. But there’s a risk it could carry unwanted stowaways that might compromise future ...