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Bennett directed telescopes toward the center of the Milky Way and found a lot of lensing - probably from large planets. The technique has been used to find exoplanets before. They bend the light of the star they orbit when they pass between that star and earth observatories. But these new examples of lensing did not happen right next to stars. They happened out in the vastness of space. Crunching the data showed that Jupiter-sized planets were doing the lensing, but they weren't orbiting any stars. They were just floating free. It's been shown that in crowded solar systems, two planets can interact gravitationally, causing one planet to lose energy and fall towards the sun. These planets were created when one planet got an extra kick of energy and spun out, away from its solar system.
Bennett's data showed evidence for at least ten of these starless planets. There may be just as many starless planets as there are stars. And given that gravitational lensing only works with large planets, we may never know how many small, Earth-sized planets are floating through space on their own.
Originally posted by AnteBellum
Just found this interesting and wanted to share.
Originally posted by Chrisfishenstein
reply to post by BlackPoison94
This stuff intrigues me but can you explain or prove that a black hole has something like mega gravity? I don't really follow this stuff too closely. Can they prove that black holes have that force? Is that the reason we can't really send anything into a black hole to see if we can track where it goes? Sorry if these questions are dumb to someone who knows, but I am interested in this stuff and just want a short lesson if someone could do so.
Good job on most of your post, you got most of it right, but you got that part wrong. Actually, you may be mis-quoting professor Hawking there, that's not exactly what he says, unless you can provide an exact quote from him to that effect, I think you've misunderstood him.
Originally posted by seedofchucky
Do black holes live forever?
According to Professor Hawking, no. He says that as a result of losing energy and mass through Hawking radiation, there would come a point when the black hole no longer has enough mass to completely curve the space around it, therefore ceasing to be a black hole. Hawking predicts that the black hole might then explode with a force of millions of hydrogen bombs! "
So, what is the smallest black hole ever discovered?
A stellar black hole of one solar mass has a Hawking temperature of about 100 nanokelvins. This is far less than the 2.7 K temperature of the cosmic microwave background. Stellar mass (and larger) black holes receive more mass from the cosmic microwave background than they emit through Hawking radiation and will thus grow instead of shrink. To have a Hawking temperature larger than 2.7 K (and be able to evaporate), a black hole needs to be lighter than the Moon (and therefore a diameter of less than a tenth of a millimeter).
So let's use the lower limit in that range for black holes, of 2 solar masses.
Astronomers have identified the smallest known black hole—an object about 3.8 times as massive as the sun....
scientists believe that these black holes can only form from stars several times the mass of the sun. But nobody's sure where the mass cutoff is.
"This limit is somewhere between two and three solar masses," Shaposhnikov said. "So with a detection of 3.8 solar masses, we get quite close to that boundary."