If the Sun were swapped for a black hole of the same mass, Earth would keep circling on exactly the same orbit, in cold darkness, admittedly. From a distance, a black hole pulls like any other object of equal mass. It only becomes a one-way trap if you get very close.
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.