What If the Universe Is a Loop?

If you got into a spaceship, and traveled long enough and fast enough, could you eventually loop back to where you started? Assuming you don’t accidentally collide...

Asteroids That Could Strike Earth

Asteroids are rocky leftovers from the early formation of our planetary neighborhood. And of the over one million that we know of, most orbit the Sun in the asteroid...

What If Planet X Was Real?

Over the past century, astronomers have speculated about the existence of a mysterious 9th planet lurking in the outer reaches of our solar system. Although we’ve...