The Sun is about 400 times wider than the Moon, but also about 400 times farther away. Seen from Earth, the two discs look almost the same size, so the Moon can cover the Sun exactly. Because the Moon is slowly drifting away, this coincidence is temporary: in hundreds of millions of years, total eclipses will end.
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.