All that is required is for a large asteroid, about 100 km (62 miles) across, to fly past the Earth transferring some of its orbital energy to our planet.

BBC: Blue Marble Nasa

Orbital debris could block all these benefits for centuries and prevent us from developing clean energy sources like space solar power satellites, exploring our Solar System and someday making humanity a multi-planetary civilization capable of surviving true climatic catastrophes.

FORBES: Beware Of Space Junk