Sailors from Oliver Hazard Perry-class frigate USS Vandegrift assist in the rescue of a family with a sick infant via the ship's small boat as part of a joint U.S. Navy, Coast Guard and California Air National Guard rescue effort in the Pacific Ocean. U.S. Navy via Reuters.
A. Dust bunnies form from the surprisingly large supply of stuff in the air, including fibers from clothing fabrics and carpeting; hair; animal fur and dander; and especially human skin cells and the dust mites that feed on them, according to Joseph Laquatra Jr., professor of design and environmental analysis at the College of Human Ecology at Cornell.
Planets are made of whatever happens to be floating around in space. Typically, it all starts with clouds or stellar disks of gas and dust, which begin to condense due to gravity in any places that are slightly more dense than others. The more the gas and dust pull together, the greater the mass of the protoplanet, and the stronger its gravity to pull even more gas and dust into it. Exactly which elements the dust consists of will depend on nearby stars. In an area of young stars with no history of supernovae , elements heavier than Iron will be very scarce, while in an area where supernovae have occurred, the full range of naturally occurring heavy elements might be found.