Astronomers from Warsaw University, Poland have identified two “rogue planets” in our galaxy which do not orbit around a star.
Unlike the vast majority of discovered planets, these rogue planets drift through space alone with no sun to shine on them.
Debate has raged in astronomical circles for years as to whether rogue planets could exist.
Since they do not have a star to illuminate them, they are extremely difficult to find as they are almost always in the dark.
However, a technique called gravitational microlensing allowed researchers to identify rogue planets by seeing when a planet comes between a distant star and the Earth.
When this happens, the planet acts like a lens, distorting the light that we can see from that star when it reaches Earth.