Science papers are always full of figures, but very rarely are they to scale, but in this astrophysics paper, which Iโ€™ve never heard of an astrophysics paper having a figure to scale, the authors included a 1:1 scale of a 5 Earth-mass back hole. So take 5 Earths worth of mass, compress it so it curbed spacetime infinitely, and this is how big that would be.

My hand for scale, donโ€™t let your actual hand get that close to a real black hole though.

ยท Toot! ยท 15 ยท 173 ยท 187

@ROCKETDRAG ...I'm supposed to be utterly terrified of space, right?

@ROCKETDRAG (or less than an AU off, depending on where mars is relative to earth right now)

@Felthry I think that bit is specifically referring to the size of the dark matter halo, which truly wouldn't change.

@ROCKETDRAG yes, but if the center of it is located on earth vs located on mars?

@Felthry Oh yeah, well, it'd be off by whatever your distance is then. I think they're just not assuming you're somewhere other than where the paper is in front of you heh.

@ROCKETDRAG ...So dense that one with the mass of a 'hot Jupiter' comes in a package the size of a bowling ball...

*whistles* o_o

@Shrigglepuss @ROCKETDRAG

I'm pretty sure that you will fall into it before it fall on you toes.

@Shrigglepuss @ROCKETDRAG with that much mass, itโ€™s your toes which would be dropping on it.

@ROCKETDRAG this made me smile. I can just imagine the smile on the authors face as they realised they could insert a 1:1 scale figure.

@carbontwelve Maybe one of a hanful of times it's actually happened in astrophysics, super jealous of them!

@nev @Shufei Here ya go!

Could the hypothetical "Planet 9" actually be a small primordial black hole?

Conclusion: It could work.

@ROCKETDRAG Next up: foldable papers to demonstrate the effects of curvature changes.


I thought you could get that close to a black hole if it didn't have an accretion disc, right?

@UnclearFuture Yep! Even with an accretion disk, as long as it's very low-energy, you can get close. The black hole in "Interstellar" was a great example of that.


Ah, thank you for explaining :).

I heard it in an SFIA video where he explained that if it didn't have one you'd have to actually try very hard to get pulled in/enter it.

@UnclearFuture Yeah! That's right! With a disk, if you flew right into it, energetic forces would potentially sow you down enough so you'd eventually fall in.

@ROCKETDRAG don't even need sauce when that shit just redshifts into oblivion all by itself like ๐Ÿ’‹๐Ÿ‘Œ

@ROCKETDRAG (though truth be told I'm sure a black hole with that low of a mass would simply violently explode in a burst of Hawking radiation long before it really got to add much of anything to its mass)

@Thaminga I surprisingly learned yesterday that it would last about 71,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000 years, give or take a Tuesday.

@Thaminga Yeah like, I too thought Hawking Radiation was some massive outpour, but turns out it's a little trickle.

Little being relative, albeit.

@ROCKETDRAG Yeah. I know it accelerates the less mass a black hole has, I just (vastly) overestimated the curve on that.

@ROCKETDRAG Out of curiosity, do you have the reference to the paper?

@ROCKETDRAG i remember reading somewhere that if one were to compress the sun to the size of a basketball it would turn into a black hole

@ROCKETDRAG Pretty sure if you'd ask me to name a domain with a 1:1 scale figure in one of its scientific papers, astrophysics would have been my last choice. :'D

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