Gamma-ray bursts are the most powerful explosions seen since the Big Bang. Triggered by collapsing giant stars or merging neutron stars, they release more energy in a few seconds than the Sun will in 10 billion years. Luckily, every one observed so far went off in other galaxies, over 100 million light-years away.
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.