The moon may have formed inside the early Earth
It's based on a theory that suggests our planet was "a giant donut of vaporized rock."
A portrait of Earth and the Moon from 3 million miles away
First observed interstellar object is a speedy, cigar-shaped asteroid
It has been traveling for hundreds of millions of years.
How NASA will defend the Earth against plagues from outer space
Because nobody wants to be dissolved by extraterrestrial amoeboids.
The robots that will sweep Earth's skies
Until then, all those dead satellites will have to fend for themselves.
The West Coast is finally getting an earthquake early warning system
This will save lives
Mars has a less dense crust than astronomers thought
Understanding the crust provides important information about the planet’s evolution.
A lawsuit almost stalled NASA's Cassini mission
It was just 73 pounds of plutonium, guys.
A huge solar flare temporarily knocked out GPS communications
The sun did its biggest burp in 12 years.