What If Mars Orbited The Earth?

Could we move to our new moon one day? Or is this one of those scenarios where everybody dies in the end? “Fly me to Mars..” Ahem, where were we? Right, Mars...

What If Two Black Holes Collided?

Black holes are the gravitational monsters of the Universe. They are so powerful that nothing, even light, can escape their grasp. One black hole is bad enough. But if...