Smallest Planet Yet Found

About the size of our moon

Astronomers searching for planets outside our solar system have discovered the tiniest one yet—one that's about the size of our moon.

But hunters for life in the universe will need to poke elsewhere. The new world orbits too close to its sun-like star and is too sizzling to support life. Its surface temperature is an estimated 700 degrees Fahrenheit. It also lacks an atmosphere and water on its rocky surface.