The asteroids approaching Earth that keep NASA scientist up at night

"We don’t know where they are,” said NASA’s planetary defense officer Kelly Fast at the AAAS conference in Arizona this week.

‘City-killer’ asteroid threat: Could thousands of undetected space rocks hit Earth? Here’s what’s keeping NASA scientists awake at night

Space agencies maintain that global cooperation and sustained investment are vital to planetary defence. While the DART mission demonstrated that deflection technology works, experts say early ...