On April 13, 2029, the asteroid Apophis, more than 300 meters wide, will sweep past Earth at an altitude of about 32,000 km, below the orbit of geostationary satellites. It will be visible to the naked eye from parts of the globe. Rest assured: calculations rule out any impact for at least a century. Spacecraft are planned to study it up 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.