Rogue planet facts for kids
Imagine planets that don't orbit a star! These are called rogue planets. They are also known as free-floating planets (FFPs) or isolated planetary-mass objects (iPMOs). Unlike Earth, which orbits our Sun, rogue planets travel through space all by themselves. They are not tied by gravity to any star or even a "failed star" called a brown dwarf.
Scientists believe there could be billions, or even trillions, of these rogue planets just in our own Milky Way galaxy! They might have formed around a star and then been kicked out, or they might have formed on their own in space, much like stars do.
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What Are They Called?
Scientists use a few different names for these lonely planets. The most common ones are rogue planet, free-floating planet (FFP), and isolated planetary-mass object (iPMO). Sometimes, you might also hear them called "starless planets" or "wandering planets" in news reports. They all mean the same thing: a planet that's not orbiting a star.
How Were They Found?
The first rogue planets were discovered around the year 2000. Scientists from the United Kingdom and Spain found them almost at the same time. They used powerful telescopes like the United Kingdom Infrared Telescope and the W. M. Keck Observatory. These early discoveries happened in areas where new stars are forming, like the Orion Nebula. Later, in 2004, a team from the United States confirmed other similar objects first seen by a Japanese team in 1999.