Astronomers Discover New Group of "Rogue Planets"

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https://www.theverge.com/2021/12/23/22851798/planets-space-rogue-stars-telescope

Yes. That is cool.

Awesome that they were able detect something that hard to detect. And cool that they exist. Rogue jupiter type planets just wandering through the galaxy with out a parent star to orbit around like we and the other eight planets in our solar system have. And like most exoplanets so far discovered have. Orphans. Probably ejected from solar systems, or maybe formed on their own.

Big gas giant planets in our solar system have chemical reactions they give off heat. They arent massive enough cause nuclear fusion in their cores and become stars. But they do give off chemically induced heat.

Jupiter gives off so much that its moons receive more heat from Jupiter than they do from the Sun. And apparently thats how they discovered these orphan Jupiters. By detecting their faint infrared emissions.

And if they find 70 in this little patch sky it suggests that the galaxy has gazillions of them. Might explain some of the missing 'dark matter'. Or thats my theory.