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Since it's a black hole, it's gravitational effect would be at least as much as the Sun. Is there evidence to support this tug of war?
by sidcool 6y ago
Since it's a black hole, it's gravitational effect would be at least as much as the Sun. Is there evidence to support this tug of war?
- iNic 6y ago> While an M⊕ object is too light to be an astrophysical black hole formed by stellar collapse, PBHs arise from over densities in the early universe [15, 16] and as a result can be substantially lighter than M . Normally black holes do have at least the mass of ~1.4 times our sun because they are formed by stellar collapse. That is why here they are considering Primordial Black Holes which a) formed differently and b) radiated some of their mass away
- sidcool 6y agoI guess I mixed PBH with a regular black hole.
- 317070 6y agoBlack holes do not have more gravity per mass than any other object. Put the other way, if the sun would suddenly change into a black hole without losing a lot of mass, the earth would still follow the exact same orbit.
- teslaberry 6y agono it wouldn't because the other planets affect our orbit and the collapse of the sun would affect mercury and venus very directly in their orbits. also the black hole polar jets would be beautiful, imagine a dark sun with two long well lit streamers cutting both ways across the sky. we'd all be dead, but it would be beautiful
- sidcool 6y agoThat's true. My point was that if there were a solar mass object beyond Pluto, it would have significant effect on orbits of all planets. But apparently PBHs can be lighter
- hliyan 6y agoI would suppose so. I would expect a lot more perturbation in the kuiper belt if a solar mass object was lurking out there.
- p1mrx 6y agoThis paper postulates a black hole with 5-15 times Earth's mass, which is considerably less than the sun.
- sidcool 6y agoI see. That's lighter that Jupiter. Do PBHs have singularity like regular black holes?
- p1mrx 6y agoIf PBHs are real, then they should be identical to "regular" black holes, just smaller. Wikipedia says "Physicists are undecided whether the prediction of singularities means that they actually exist, or that current knowledge is insufficient to describe what happens at such extreme densities."
- holler 6y agoincredibly hard to conceive 15 Earths shrunk down to the size of a grapefruit! fascinating