Technically known as NGTS-4b, the planet is three times the size of Earth and 20% smaller than Neptune. It's also hotter than Mercury with a temperature of 1,832 degrees Fahrenheit. And the planet has its own atmosphere.
An international team of astronomers used the Next-Generation Transit Survey observing facility to spot the small rogue planet.
Its mass is 20 Earth masses and it whips around its star in a full orbit every 1.3 days. A study detailing the planet published Monday in the journal Monthly Notices of the Royal Astronomical Society.
The announcement comes on the heels of last week's discovery of 18 Earth-sized exoplanets.
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