Deep in the Amazon, Canaima National Park in Venezuela is a green wonderland. Home to Angel Falls, the tallest uninterrupted waterfall in the world at more than 3,200 feet, it serves as a source of national...
Astronomers have revealed new evidence that not just one, but four tiny planets are circling around Barnard's Star, the second-nearest star system to Earth.
The four planets, each only about 20 to 30% the mass of Earth,...
