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In every documentary I've seen about worm holes, I have noticed that they usually say that according to the General Theory of Relativity, there could exist worm holes called traversable wormholes; these are stable worm holes and travelling through them is possible. In that case they can be used to travel in time, and Inter-Universe travel may also be possible. One can also find some of the above statements in Wikipedia.

Now my questions are the following:

  1. Is travelling through a worm hole really possible (if we can find a stable worm hole)?

    The reason for the question is: according to the same general theory of relativity which gives them the traversable worm whole with exotic matter, worm holes have a similar metric to black holes. As we go close to a black hole the gravitational pull at one point of our body (or a spaceship or probe's body) is different from the gravitational pull at some other point of our body (or a spaceship or probe's body) which will lead to a severe stress and our body (or a spaceship or probe's body) will be broken into pieces. This should also be the case for a worm hole, I guess. Worm holes are a particular kind of space-time distortion or a field of gravitation, similarly to black holes, so can any man-made instrument or craft survive the trip through a region of severely in-homogeneous gravitational field?

If the answer of Q1. is "no", then I would also like to know

  1. i. Why is such a thing shown in scientific documentaries narrated by world-widely popular scientists? ii. Are those documentaries not misleading their audiences?

I also have a separate question,

  1. If there is a worm hole, will it not attract nearby objects? or don't worm holes exert gravitational attraction?
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I can only answer with opinion rather than facts, but for what it's worth:

Is travelling through a worm hole really possible (if we can find one stable worm hole)?

No. Wormholes are science fiction. So is time travel. See A World without Time: The Forgotten Legacy of Godel and Einstein. A clock doesn't literally clock up the flow of time like some cosmic gas meter. It features some kind of regular cyclical motion, such as a pendulum or an oscillating crystal, which it effectively counts, showing you a cumulative result called "the time". This is just a measure of motion, and you can't travel through a measure of motion. Wormholes permit time travel, so they're science fiction too. Despite what you saw in Interstellar.

Can any man-made instrument or craft survive the trip through a region of severely in-homogeneous gravitational field?

There's a problem with this question, in that a gravitational field is a region of inhomogeneous space. See Einstein talking about it in his 1920 Leyden Address, and this paper. But I'll presume the question is can a craft survive a trip through a severe gravitational field, to which I'll say yes. But it isn't some back-to-the-future wormhole.

Why is such thing shown in some scientific documentaries narrated by some world widely popular scientists?

Because some of those "popular scientists" are more interested in promoting themselves than serious science, and because the science-fiction stuff attracts attention. Woo sells. People lap it up.

Isn't showing such thing misleading the audience?

Yep.

If there is a worm hole will not it attract the nearby objects or isn't worm hole exert gravitational attraction?

Notwithstanding my comments above, any concentration of energy will cause gravity, and we know of nothing which consists of negative energy.

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  • $\begingroup$ This fails to really address the question, and it ignores the existence of GR solutions with closed timelike curves. $\endgroup$ – Emilio Pisanty Mar 31 '15 at 16:22
  • $\begingroup$ There are theories of wormholes that do not violate known laws of physics (often they come with other solutions that do violate laws, i.e. white holes and the 2nd law of thermodynamics) so I think this answer is perhaps a bit misleading. Also, FYI there are theories of gravity that do admit 'repulsive' gravity, for example Domain walls. $\endgroup$ – Akoben Mar 31 '15 at 17:41

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