We often picture a bomb going off at one point and flinging matter into the void. In reality, the Big Bang has no centre: space itself expanded, everywhere at once. Wherever you stood in the Universe, you'd see distant galaxies moving away from you. There's no starting point and no 'outside'.
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.