Video & Article: White Science: 70 wandering planets – Largest-ever group of rogue planets discovered in Milky Way
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[I enjoy astronomy and these weird planets (as well as STARS!) that fly around wildly and randomly is crazy. To me this is some of the strangest and weirdest stuff that scientists have discovered. These free floating planets can also be propelled along at high speed. And you get stars that do this too and they are dangerous. This was discovered by French scientists. Jan]
Here’s a short video about it: https://www.youtube.com/watch?v=7ZpX4f5_LvQ&t=3s
70 wandering ‘rogue’ planets the size of Jupiter in Milky Way are largest group ever discovered
Largest-ever group of ‘rogue’ planets discovered in Milky Way
Astronomers have found dozens of ‘rogue’ exoplanets roaming the Milky Way without a parent star to hold them in orbit. At least 70 such cosmic nomads have been confirmed, but the number could be as high as 170, a new study says.
Only a few such planets, which have masses similar to those in our solar system, had been discovered to date, with this latest batch representing the largest single collection we know about. They were spotted in the Milky Way around 420 light-years from Earth, according to findings published last week in the Nature Astronomy journal.
Such wandering worlds are impossible to imagine since they are usually located far away from any star that could illuminate them. However, researchers from the Cosmic Dance project at the Laboratoire d’Astrophysique de Bordeaux searched for their heat signatures and other indicators that could be detected by sensitive cameras on large telescopes.
“We measured the tiny motions, the colors and luminosities of tens of millions of sources in a large area of the sky,” the study’s lead author, Nuira Miret-Roig, said. “These measurements allowed us to securely identify the faintest objects in this region, the rogue planets.”
Since the planets are only a few million years old, they are still young enough to emit heat and infra-red energy. Scanning two decades worth of data from telescopes on Earth and in space, they found at least 70 worlds comparable in size to Jupiter within the Scorpius and Ophiuchus constellations.
Project leader Hervé Bouy said the data from the “tens of thousands of wide-field images” the team studied over “hundreds of hours of observation” added up to “literally tens of terabytes.”
There could be several billions of these free-floating giant planets roaming freely in the Milky Way without a host star.
The lack of an exact number of the elusive worlds discovered is due to uncertainty over their exact masses. According to the European Southern Observatory, objects that are about 13 times the size of Jupiter are likely to be “failed stars” called brown dwarfs.
Little else is known about how these planets are formed and why they were kicked out of their parent solar system. But Bouy said, “little can be done to study them with current facilities” since the planets are “extremely faint.”
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