Mysterious Earth-sized planet could be hiding in plain sight in our Solar System
If such a planet exists, researchers say it would have a mass about 1.5 to...3 times that of Earth!
A mysterious green comet is approaching Earth and could be visible to the naked eye soon
Here's how to see it
Fountains of diamonds erupt from Earth’s center as supercontinents break up
Researchers noticed that kimberlites occur most often during times when the tectonic plates are rearranging themselves in big ways