EarthMoon craters hint huge asteroids bombarded Earth 800 million years ago Craters on the moon show it was probably bombarded with asteroids about 800 million years ago, which also rained down on Earth and could have plunged the planet into an ice age News
VideoMartin Rees: Humanity's future – predictions for the next century Astronomer Royal Martin Rees makes some predictions on humanity's future, and calls for coordinated global action to ward off threats from biotech, cyber technologies and advanced AI Video