A NASA spacecraft rammed an asteroid at blistering speed Monday in an unprecedented dress rehearsal for the day a killer rock menaces Earth.
The galactic slam occurred at a harmless asteroid 7 million miles (11.3 million kilometers) away, with…
A NASA spacecraft rammed an asteroid at blistering speed Monday in an unprecedented dress rehearsal for the day a killer rock menaces Earth.
The galactic slam occurred at a harmless asteroid 7 million miles (11.3 million kilometers) away, with…