Clarification: Black Holes

Squeakers
Newbs & Noobs

Anyway, someone answered!!

> From: srivatsa@gmail.com
> Date: Fri, 11 Aug 2006 10:40:45 -0400
> To: undisclosed-recipients:;
> Subject: Wormholes
>
> Topic: Cosmology
> Level: I am an adult with some college level physics and have a casual
> interest in astronomy.
>
>
> When it’s said that a black hole and a white hole parallel to each other
> topologically on the spacetime fabric can make a wormhole, how is the actual
> ‘hole’ made? My understanding is that the end of the gravitational well of a
> black hole is a dead end, not a rip. If it IS a rip, then what would it mean
> if something ‘fell out’ of the black hole?
> Please help.

Hello srivatsa,

Thank you for writing to Ask an Astrophysicist.

While the idea of using black hole/white hole pairs is great for science
fiction authors, the truth of the matter is that physicists do not see this
as a viable way to transfer objects from one of the Universe to the other.

In fact, most physicists agree with you that black holes are just a “dead
end” in the Universe
– once matter crosses an event horizon, it’s stuck
inside that black hole until the end of time.

The idea of a wormhole came about from solutions to the equations of
relativity; however, just because solutions to an equation exsist doesn’t
mean they can happen in nature. As we’ve stated in answers to previous
questions (see
http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/011027a.html and
http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/970330a.html ), the
physics of black holes and relativity just do not allow “tunnels” through
space and time from a black hole. At least they don’t allow for tunnels
that would be stable enough for anything with any mass to pass through.

We hope this helps!

Barbara & Ilana
For Ask an Astrophysicist

Thanks a lot!

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