Every year in August, the same Mars message circulates across the Internet: The Red Planet will appear “as big as the full moon” in the sky, as seen with the naked eye. The problem is, it’s not true: Skywatchers won’t be able to see a “double moon” in the late August sky.

The so-called Mars Hoax (which started in 2003 after a real-life close approach of Mars to the Earth) is just one of a series of false claims concerning the Red Planet.