In 1927, Georges Lemaître, a Catholic priest and physicist, proposed that the Universe is expanding, two years before Hubble's famous observations. He concluded the cosmos must have begun as a 'primeval atom'. Einstein, initially sceptical, reportedly called his maths correct but his physics 'abominable', before coming round to expansion.
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.