Named ʻOumuamua, it was moving too fast to be bound to the Sun: the first interstellar object ever seen. Highly elongated or flattened, it sped up slightly as it left, with no visible tail, which still puzzles astronomers. Two more interstellar visitors have been spotted since, including comet 3I/ATLAS in 2025.
A large share of Earth's water molecules formed in the interstellar cloud that existed before the Sun was even born, more than 4.6 billion years ago. You are literally drinking a cosmic fossil.
By day, the Martian sky looks butterscotch because of fine dust hanging in the air. But at dusk, those same grains scatter blue light forward, creating a bluish glow around the Sun. Rovers have photographed these blue sunsets: the exact reverse of what we see on Earth.