SpaceEarth may be partly made of rocks from elsewhere in the galaxy We’ve only seen one interstellar object, a rock called ‘Oumuamua that passed by in 2017, but they may be crucial to speeding up the planet-building process News
SpaceSaturn’s rings formed in a smash-up less than 100 million years ago Some of the Cassini spacecraft’s final measurements of Saturn’s gravitational field show that its rings are younger than we thought, and its winds run deeper News