SpaceTitan has a belt of ice 6300 kilometres long that shouldn't be there The surface of Saturn’s moon Titan is mostly coated in a thick layer of sediment, but it has a long corridor of bare ice that is proving difficult to explain News
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