Historic planetary defence drill launched as mysterious interstellar visitor nears Earth
Space agencies say the drill could be crucial to protecting Earth from future deep-space threats
Space
Nasa rover makes major discovery as evidence of miniature lightning bolts on Mars uncovered
The discovery may change how manned missions to the Red Planet are planned
Groundbreaking new images show moment supernova is born in violent space inferno
The new pictures could help upend our understanding of how supernovae come to be
