What If the Earth Had Two Moons. In it, he leads readers on a ten-world journey that explores what our planet would be like under alternative astronomical conditions. Comins says that in each case ...

The curious minds at What If explore how Earth would change if it had 79 moons instead of just one.

The moon looms large in life on Earth as we know it. So, what would change if it disappeared? Or if it was much larger?

If Earth had two moons, it would be catastrophic. An extra moon would lead to larger tides and wipe out major cities like New York and Singapore.

Earth doesn't really have a second moon—but here's what would happen if we did If you were hoping to see the “mini moon,” you’ve probably been disappointed. But experts say the asteroid ...

He told me that the question of what would happen if the moon were bigger matters because the moon and Earth are a system. Our gravitational pull affects the moon.

Part 6: What if ... the moon had never formed? Scientists think material gouged out by a titanic collision between the freshly formed Earth and a Mars-size celestial body some 4.5 billion years ...

What If is a Webby Award-winning science web series that takes you on a journey through hypothetical worlds and possibilities, some in distant corners of the universe, others right here on Earth.

Such precise moon-hunting is a huge leap from when 1991 VG, the first mini-moon to be detected, gained notoriety as people argued whether it was a natural object or if it had more extraterrestrial ...