Andromeda is closing in on the Milky Way at about 110 km/s. Their merger, long considered certain within 4 to 5 billion years, may only have about a 50% chance of happening within 10 billion years, according to a 2025 study. And if it does, stars will almost never collide: they're far too spread out.
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.