Haze, a slight clouding of the atmosphere caused by the suspension in the air of dust, soot, or other solid matter. Haze can also occur as a mixture of solid particles with tiny water droplets. A suspension consisting mostly or entirely of water droplets is a mist. A thick mist is a fog. Optical haze is caused by unevenly heated air that refracts light irregularly, causing distant objects to shimmer or waver.
Nebulae are collections of dust and gases scattered across the galaxy. They're the sites where stars are born and what's left behind after they die.
Some scientists believe that space is infinite. But is it? If it isn't, what form does space take? Is it a dodecahedron or a triple torus?