Using the Hubble Space Telescope, astronomers have discovered a new rogue planet that was orphaned from its home planetary system. The discovery was possible with a little luck and some help from Einstein.
According to the prevailing theory of how the Moon formed, it all began roughly 4.5 billion years ago when a Mars-sized object (Theia) collided with a primordial Earth. This caused both bodies to become a molten mass that eventually coalesced to form the Earth-Moon System (aka. The Giant Impact Hypothesis. This theory also states that the Moon gradually cooled from the top down, with the crust solidifying and arresting lava flows early in its history. However, recent findings from samples obtained by China's Chiang'e-5 probe indicate that lava existed at shallower depths longer than previously thought.

