Any object turns into a black hole if it's crushed below a critical size called the Schwarzschild radius. For the Sun, that's about 3 km. For Earth, it's barely 9 millimetres: the whole planet's mass in a marble. Relax, no natural force can squeeze Earth like that; only very massive collapsing stars manage it.
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.