The travel of comets

1. High speed from space : A comet speeds through the Earth's atmosphere at up to 20 km/second (12 miles/sec), causing the atmosphere to heat up quickly.

2. Explosion in the sky : The comet explodes 9 km (6 miles) above the Earth's surface. The heat vaporises rocks, which rain back down on Earth.

3. Shock effects : Shock waves from explosion travel outwards from the centre of the blast. They flatten the trees and other structures. The shock waves also trigger earthquakes and set off fires.

Tag :comets travel