What Are Rogue Planets?

there are many planets that do not orbit a star, and instead, drift through the emptiness of interstellar space

It is very unlikely that rogue planets formed in interstellar space. Temperatures are simply too cold for material to coalesce into a planet

 Every rogue planet likely began its life around a star along with other planets.

Most of the forming planets will collide with and absorb one another, increasing their overall size and reducing the total number of planets

 Rogue planets are tremendously difficult to detect since there is no star for them to reflect light from.

The most reliable method for detecting rogue planets is called gravitational microlensing.

 The first rogue planet was discovered in 2011, despite the fact that their existence was predicted many decades prior.

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