With a mass 333,000 times that of Earth, its pull keeps the planets in orbit. However, according to Einstein's theory of relativity, changes in gravity propagate at the speed of light.

For decades, scientists have debated whether Venus might have once resembled a habitable twin to Earth. New research ... candidates for habitability. Future missions, such as NASA’s DAVINCI ...

The Mad Max franchise mostly takes place in a post-apocalyptic world, with the various battles turning the modern-day Earth into a barren wasteland where the ground is too sour to grow anything.