Siegfried Fred Singer was an Austrian-born American physicist and emeritus professor of environmental science at the University of Virginia, trained as an atmospheric physicist. He was known for rejecting the scientific consensus on several issues, including climate change, the connection between UV-B exposure and melanoma rates, stratospheric ozone loss being caused by chlorofluoro compounds, often used as refrigerants, and the health risks of passive smoking.

Phobos is the innermost and larger of the two natural satellites of Mars, the other being Deimos. The two moons were discovered in 1877 by American astronomer Asaph Hall. It is named after Phobos, the Greek god of fear and panic, who is the son of Ares (Mars) and twin brother of Deimos.