A satellite in low earth orbit releases a "Rod from God" from its payload, initiating the Orbital Kinetic bombardment.

Mechanical viruses attack the earth.

War of the worlds-esque viruses roam across a conquered earth, searching to eliminate any survivors

A nuclear explosion devastates the abandoned city

The moon crashes into the ocean.

the moon falls down to Earth near the coasts on africa

asteroid is about to destroy the worst continent

Oh boy ain't it a jolly good time to end it all.

Green alien thinks it's a jolly good time to end all life on a Mars-looking planet