How does water make it to the moon? - This is the billion-dollar question
earth
Astronomers are racing to explain peculiar orbits of faraway objects at the edge of our solar system.
If such a planet exists, researchers say it would have a mass about 1.5 to...3 times that of Earth!
Here's how to see it
Researchers noticed that kimberlites occur most often during times when the tectonic plates are rearranging themselves in big ways
Here's why scientists worry it could happen soon
How groundwater depletion affects Earth's rotational pole
What could possibly go wrong?
A skyscraper-size asteroid was revealed in year-old telescope data
Secret documents suggest a suspicious cover-up