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Old 07-February-2008, 07:54 PM
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Default Could You Stand on a Neutron Star?

I've been sort of racking my brain on a little thought experiment lately. It came about after somebody asked me how much they'd weigh on a neutron star. The answer (for an average 200-lb person here on Earth) was in the order of 260 billion pounds.

Then I thought... "what if you could stand on a neutron star?" What conditions would have to exist? Now, put aside the insane heat, radiation and magnetic fields that would obliterate you from thousands of miles away, if the star was spinning fast enough, you could be chillin' at the equator, and you might even have your own oxygenated atmosphere to breathe if your luck holds out.

As far as I can tell, the fastest neutron star observed spins at 1,122 times every second. Not bad for an object several miles in diameter. But even with centripetal force counteracting gravity, you'd still be a billion pounds too heavy. But I didn't take into account relativity. Which is a bit beyond a film major such as myself (I got a C- in physics and was happy for it.) I figure since extreme speed and/or gravity causes time to tick slower relative to us, the star might be spinning much, much faster in its own little bubble of space time than we can observe. Unless that phenomenon is already corrected for when discovering a new neutron star.

So the question is: Taken into account relativity and centripetal force, is it physically possible for a neutron star to have a gravitational "safe zone" along its equator?

Ok, I know the answer is "NO, YOU WOULD DIE", but it's still fun to think about.
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Old 07-February-2008, 10:30 PM
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You'd have to be a complete degenerate.
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Old 07-February-2008, 11:24 PM
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Let's imagine that your body (minus your head) was a weightless cylinder with a 15 cm radius, and the strength of Tungsten. This 1.7 meter long cylinder is placed vertically on a very firm surface. The we place your head on it, and your head weighs lets say 30 billion tons. As you might guess, the Tungsten would rapidly get spread out into a layer one atomic nucleus thick.

But you're asking wither it might not be possible for a rapidly enough spinning neutron star to have a place where centripetal acceleration, and relativistic factors might almost equal the gravitational acceleration. I think the answer to this is "not for long". You could contrive a situation in which a neutron star that is already spinning close to the stable limit merges with another neutron star in such a way as to add the maximum angular momentum. If that were to happen, then for perhaps some microseconds the situation you're asking about might exist before the energy lost through gravitational waves and other relativistic details slowed it down enough that your weight would crush you.

Let me add that if the spinning did get fast enough to come close to balancing gravity, the forces that degenerate the atoms would also be overcome, and so the equator of the neutron star would explode.
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Old 08-February-2008, 02:07 AM
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You'd have to be a complete degenerate.
Groan! I collapsed when I read that joke.
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Old 08-February-2008, 03:59 AM
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Setting aside the problems mentioned above, if you could stand on the surface, what would you see looking out at the horizon.? Specifically, what would the surface look like, and how would the stars near the horizon be distorted?
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Old 08-February-2008, 04:07 AM
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Groan! I collapsed when I read that joke.
If that was a deliberate pun, you have a crushing sense of humor.
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Old 08-February-2008, 04:31 AM
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I feel neutral about it.
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Old 08-February-2008, 04:42 AM
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Originally Posted by 3.885AM View Post
Setting aside the problems mentioned above, if you could stand on the surface, what would you see looking out at the horizon.? Specifically, what would the surface look like, and how would the stars near the horizon be distorted?
I'd imagine it'd be an almost perfect mirror surface, and the sky would be flickering streaks of light. Might be pretty trippy actually.

As for the neutron star puns, they give me a pulsing headache.
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Old 08-February-2008, 04:57 AM
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Talking A Bit of Disney in the Night ...

When you stand on a neutron star,
You won't know how flat you are.


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Old 08-February-2008, 05:37 AM
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Lightbulb Dragon's Egg

Standing up on a neutron star is one of the key elements in Robert Forward's excellent science fiction novel Dragon's Egg, first published in 1981. The story centers on life forms on the surface of a neutron star, and how they deal both with the extreme gravity, and the extreme magnetic fields. Forward was a physicist, and did an excellent job describing an environment consistent with the physics of neutron stars. One of the key elements was the "hard direction" vs the "easy direction", when the neutron star creatures tried to move across (hard) or along (easy) magnetic field lines.
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Old 08-February-2008, 06:07 AM
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If that was a deliberate pun, you have a crushing sense of humor.
No, I just realize the gravity of the situation.
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Old 08-February-2008, 01:26 PM
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Read last few pages of Alastair Reynolds' "Revelation Space", where a character is standing on the surface of a neutron star. She is kept alive and unharmed by local manipulation of gravity, not by spin, but since Reynolds is an astrophysicist I trust the "landscape" description to be accurate.
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Old 09-February-2008, 01:05 AM
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ok, with or without all the luck you could happen to obtain with this neutron star situation, your skeleton couldn't hold up to that kind of pressure.

i think anybody who has watched dragonball Z, when goku was flying to namek in bulma's dad's space ship and turned on the gravity to train while he waited to get there would know this (turned it to like 1000x I think and made a comment about his skeletal structure crushing if it was any higher)
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Old 09-February-2008, 01:08 AM
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No, I just realize the gravity of the situation.
i was practically laying flattened to the floor laughing when i read these
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Old 09-February-2008, 01:57 AM
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humor is a bit thin on the ground around here.
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Old 09-February-2008, 05:00 AM
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humor is a bit thin on the ground around here.
As is pretty much anything else on the surface of a neutron star!
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Old 09-February-2008, 04:20 PM
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I'm sorry for starting this punning, I was just being dense. I'd be crushed if you didn't care for it.
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Old 09-February-2008, 08:57 PM
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Well all the atoms in your body would be deformed into elongated spikes, making it a thorny situation at best.

Also with an atmosphere of vaporized iron 1 cm thick, it leaves very little breathing room.
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Old 09-February-2008, 09:03 PM
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I hope my puns don't fall flat.
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Old 10-February-2008, 12:43 AM
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While they are an attractive place to visit, I've heard that the services and amenities are spread thin on the ground.
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