This isn't April fools day, and we're not pulling your leg - there is indeed a second rocky companion out in space orbiting Earth - besides our moon. This miniature-moon, as it's nicknamed, goes by the scientific name "2016 HO3". It's an asteroid, technically, but it's nearly unique in our known history of Earth and nearby objects. This quasi-satellite or near-Earth companion is "the best and most stable example to date" of such a space body. "One other asteroid -- 2003 YN107 -- followed a similar orbital pattern for a while over 10 years ago, but it has since departed our vicinity. This new asteroid is much more locked onto us," said Paul Chodas, manager of NASA's Center for Near-Earth Object (NEO) Studies at the Jet Propulsion Laboratory in Pasadena, California.