What If on MSN

What if Earth became a massive spaceship?

Imagine that the Sun is on the verge of exploding. Or that a planet-killing asteroid is headed our way. Or maybe you just ...
Astronomy

The Sun’s galactic migration may have made life on Earth possible

Over 4 billion years ago, as planets were coalescing around the newborn Sun, our star may have gone on an epic road trip across the Milky Way along with thousands of stellar “twins.” And we may owe ...