Pulsars are neutron stars that sweep space with a beam of radio waves as they spin, like a lighthouse. The fastest known, PSR J1748-2446ad, turns 716 times per second. For an object about 20 kilometres across, that means its surface is racing along at tens of thousands of kilometres per second.
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.