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TheRedstoneHive
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29 Mar 2017 19:38

Ok
 
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TheRedstoneHive
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29 Mar 2017 19:39

For some reason the Neutron Star looks like a wormhole when you go next to it xD
 
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JackDole
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30 Mar 2017 00:53

TheRedstoneHive wrote:
Source of the post For some reason the Neutron Star looks like a wormhole when you go next to it

Can you post a picture?

Perhaps that is the gravitational lens effect. Exactly the same as with black holes or white dwarfs.
 
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Xoran
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30 Mar 2017 08:42

JackDole wrote:
Source of the post Perhaps that is the gravitational lens effect. Exactly the same as with black holes or white dwarfs.

I don't think white dwarf stars can have gravitational lens effect. Here is a picture of Sirius B, and i can't see a gravitational lens effect anywhere. :)
sirius b.png
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JackDole
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30 Mar 2017 09:25

Sirius B
scr00024.jpg

The picture is from SE 0.973
 
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TheRedstoneHive
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30 Mar 2017 11:52

This is what it looks like for me.
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Wormhole.png
 
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JackDole
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30 Mar 2017 12:59

TheRedstoneHive,
this may be a bug. I can not test it, SE 0.980 does not work for me at the moment.

By the way, 17 solar masses are too much for a neutron star. Neutron stars have only a maximum mass about 2 - 3 solar masses. At a higher mass, the star becomes a black hole.
 
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TheRedstoneHive
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30 Mar 2017 19:51

ok.
 
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Watsisname
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30 Mar 2017 20:57

Xoran wrote:
Source of the post I don't think white dwarf stars can have gravitational lens effect. Here is a picture of Sirius B, and i can't see a gravitational lens effect anywhere

They do, it's just a lot weaker than a black hole or neutron star.  Light skimming the surface of a white dwarf will be deflected by a few arc minutes of angle.
 
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Xoran
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31 Mar 2017 05:49

I meant that SE has no white dwarf gravitational lensing, not that they don't exist IRL. Of course, it is possible that you meant that white dwarf has gravitational lensing in SE, in which case why have white dwarf gravitational lensing at all if it is invisible? :)
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JackDole
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31 Mar 2017 06:34

Xoran,
as you can see in the picture I posted, SE has gravitational lensing for white dwarfs. At least in version 0.973.
If it has no gravitational lensing in SE 0.980, then this may be a bug.
 
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Xoran
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31 Mar 2017 08:24

JackDole wrote:
Source of the post Xoran,
as you can see in the picture I posted, SE has gravitational lensing for white dwarfs. At least in version 0.973.If it has no gravitational lensing in SE 0.980, then this may be a bug.

White dwarfs doesn't have gravitational lensing in 0.9.8.0 and it's not a bug. :) 
Quoted from Watsisname:
It's not just you, and I think this is a "fix".  The gravitational lensing around a white dwarf is pretty weak compared to a neutron star or black hole.  To give an idea, light which passes 2 radii from a black hole is bent by almost 60 degrees.  Light which passes 2 radii from a white dwarf is bent by only a few hundredths of a degree.

(Actually the deflection angle that close to a black hole is quite a bit bigger, since the formula I use ( \alpha = \frac{4GM}{c^2 b} ) isn't very accurate there, but for the white dwarf it's pretty accurate.)
Space is too big to understand, so do not try to understand.
 
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JackDole
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31 Mar 2017 09:40

Xoran,
this only means that the gravitational lens effect is very small. As in the picture. You have to go very close to the star to see it. This does not mean that the effect is not there at all. That the gravitational lensing is not present at all, I think is a bug in SE 0.980.

Possibly, of course, a deliberate 'bug'. Just like the missing surfaces of gas giants.
 
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Xoran
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31 Mar 2017 09:52

I think it's a deliberate thing, the gravitational lensing of white dwarf stars is so small it doesn't make that much sense to implement it, the payoff is probably very tiny compared to the work put into it. I don't even know if it would be visible at all. :)
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JackDole
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31 Mar 2017 10:50

Xoran,
actually, also a star like our sun should have a gravitational lens effect.
Through this effect the theory of relativity has been proved, on 29 May 1919.
The effect is definitely visible. 8-)

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