Live data from Hacker News

What if Planet 9 is a Primordial Black Hole?

link.aps.org

1–10 of 127 posts

Re: What if Planet 9 is a Primordial Black Hole?

#5
post #4
post #3

A person should be allowed to dream sometimes, how freaking cool would this be. A block hole right in our neighbourhood, even closer than Alpha Centauri. Just imagine what kind of things can be learned from studying it.

Cool, and absolutely terrifying.

On the flip side, you wouldn't be any less dead if you fell into Jupiter and that's a lot easier to get to

Re: What if Planet 9 is a Primordial Black Hole?

#6
post #4
post #3

A person should be allowed to dream sometimes, how freaking cool would this be. A block hole right in our neighbourhood, even closer than Alpha Centauri. Just imagine what kind of things can be learned from studying it.

Cool, and absolutely terrifying.

In what sense? It poses no threat to us.

Re: What if Planet 9 is a Primordial Black Hole?

#7
post #4
post #3

A person should be allowed to dream sometimes, how freaking cool would this be. A block hole right in our neighbourhood, even closer than Alpha Centauri. Just imagine what kind of things can be learned from studying it.

Cool, and absolutely terrifying.

This is not scary. Yes the event horizon will expand the more matter falls into its gravity well, but otherwise a black hole acts like a normal planet orbiting the Sun.

Re: What if Planet 9 is a Primordial Black Hole?

#8
post #4
post #3

A person should be allowed to dream sometimes, how freaking cool would this be. A block hole right in our neighbourhood, even closer than Alpha Centauri. Just imagine what kind of things can be learned from studying it.

Cool, and absolutely terrifying.

Agree with cool, but not with terrifying. According to the paper, the mass would be ~5-15 M⊕ at a distance of 300-1000AU, so not a threatening object in any way.

Re: What if Planet 9 is a Primordial Black Hole?

#9
So would this PBH orbit the Sun?

> This scenario could be confirmed through annihilation signals from the dark matter microhalo around the PBH.

How long does this experiment take to construct, and to execute? Days/weeks/decades?

BTW has anyone thought of getting in touch with the Lectroids? They're bound to know more about Planet 9 than we do.

Re: What if Planet 9 is a Primordial Black Hole?

#10
annihilation signals from the dark matter microhalo around the PBH.

What? Since when do we know enough about dark matter to say something like that?

Even if we did the diameter of a black hole with the mass of a dozen earths is smaller than a beach ball and the density of dark matter in the outer solar system is one AMU for every three cubic centimeters. I'm skeptical we have equipment sensitive enough to detect such a small number of interactions at the distance of 500+ AU.

Post reply on HN