8 ways life would get weird on a flat Earth

NASA's InSight Mars lander just gave scientists an unprecedented look at the guts of the red planet. Here's how they compare to Earth's.

What would happen if the moon were twice as close to Earth?

Ancient meteorite could reveal the origins of life on Earth - a 4.6-billion-year-old meteorite found lying in the imprint of a horseshoe is likely a remnant of cosmic debris left over from the birth of the solar system and could answer questions about how life began on Earth