Two Alpha jets collided midair during a training exercise in France before crashing to the ground and exploding in a massive fireball, dramatic video shows.

The two galaxies – collectively called Arp 220 – are merging 250 million light-years from Earth in the constellation Serpens (the Serpent). The further away an object is, the further back in ...

Two continents are drifting at a rate of 7 centimeters per year and could eventually collide, reshaping the planet. Eighty ...