What if Planet 9 is a Primordial Black Hole? · HackerPapers discussions

What if Planet 9 is a Primordial Black Hole? — mentioned by snowwrestler

Mon, 05 May 2025 12:40:43 GMT

This paper exploring the idea has as Fig 1. a to-scale illustration of a 5-Earth-mass primordial black hole: https://arxiv.org/pdf/1909.11090 As I recall, it did not get printed this way because the ink would be too expensive, or mess with the paper.

Paper and discussion history. A mention is not an endorsement.

What if Planet 9 is a Primordial Black Hole? — mentioned by perihelions

Sat, 11 May 2024 12:38:39 GMT

- "In that case you'd see X-rays, gamma rays, etc., but maybe only briefly." One speculative possibility is that we could find a continuous gamma annihilation signal from its dark matter halo, https://arxiv.org/abs/1909.11090 https://hn.algolia.com/?query=What%20If%20Planet%209%20Is%20...

Paper and discussion history. A mention is not an endorsement.

What if Planet 9 is a Primordial Black Hole? — mentioned by ben_w

Thu, 25 Apr 2024 19:20:09 GMT

One of the options is that it's a primordial black hole, which leads to my favourite "actual size" caption on a diagram, page 5: https://arxiv.org/pdf/1909.11090

Paper and discussion history. A mention is not an endorsement.

What if Planet 9 is a Primordial Black Hole? — HN submission

Thu, 28 Sep 2023 14:53:14 GMT

What if Planet 9 is a Primordial Black Hole? (2019)

117 points; 177 discussion replies on HN. Paper and source history. A submission is not an endorsement.

What if Planet 9 is a Primordial Black Hole? — mentioned by hkt

Thu, 19 Aug 2021 07:16:26 GMT

I have bad news for you: https://arxiv.org/abs/1909.11090

Paper and discussion history. A mention is not an endorsement.

What if Planet 9 is a Primordial Black Hole? — mentioned by sabujp

Fri, 13 Aug 2021 12:33:32 GMT

there's a 1:1 scale picture of the black hole fig 1: https://arxiv.org/pdf/1909.11090.pdf

Paper and discussion history. A mention is not an endorsement.

What if Planet 9 is a Primordial Black Hole? — HN submission

Fri, 13 Aug 2021 09:35:23 GMT

What if Planet 9 is a Primordial Black Hole? (2019)

159 points; 153 discussion replies on HN. Paper and source history. A submission is not an endorsement.

What if Planet 9 is a Primordial Black Hole? — mentioned by JNRowe

Sat, 27 Mar 2021 11:49:27 GMT

"Exact scale (1:1) illustration of a 5M⊕ PBH."¹ ¹ https://arxiv.org/abs/1909.11090

Paper and discussion history. A mention is not an endorsement.

What if Planet 9 is a Primordial Black Hole? — mentioned by millstone

Wed, 23 Sep 2020 03:40:20 GMT

Best figure from a black hole paper is surely Scholtz and Unwin, page 5: https://arxiv.org/pdf/1909.11090.pdf

Paper and discussion history. A mention is not an endorsement.

What if Planet 9 is a Primordial Black Hole? — mentioned by ISL

Thu, 30 Jul 2020 03:57:45 GMT

One should not miss Figure 1 of the arXiv preprint, which is, alas, absent from the final PRL. https://arxiv.org/pdf/1909.11090.pdf It is among the rarest journal-article figures in physics. If I'd been asked to referee the paper, I'd have campaigned hard to keep it in.

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What if Planet 9 is a Primordial Black Hole? — mentioned by SiempreViernes

Wed, 16 Oct 2019 21:18:05 GMT

No, that paper says "What if Planet 9 is a Primordial Black Hole?" and then works out some consequences and finds them to be not ruled out. It doesn't start from observations and arrive at the PBH in any natural way. To judge for yourself hour serious the authors are in proposing a primordial black hole to explain the anomalies in the outer asteroid belt, I refer you to figure 1 in their paper: https://arxiv.org/pdf/1909.11090.pdf

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What if Planet 9 is a Primordial Black Hole? — mentioned by eganist

Thu, 26 Sep 2019 07:03:04 GMT

Page 5 of the pdf (https://arxiv.org/pdf/1909.11090v1.pdf) for anyone wondering.

Paper and discussion history. A mention is not an endorsement.

What if Planet 9 is a Primordial Black Hole? — HN submission

Thu, 26 Sep 2019 04:10:45 GMT

What If Planet 9 Is a Primordial Black Hole?

285 points; 345 discussion replies on HN. Paper and source history. A submission is not an endorsement.