Back to Home

Blackholes2 Forum Message

Forums: Atm · Astrophotography · Blackholes · Blackholes2 · CCD · Celestron · Domes · Education
Eyepieces · Meade · Misc. · God and Science · SETI · Software · UFO · XEphem
RSS Button

Home | Discussion Forums | Blackholes II | Post
Login

Be the first pioneers to continue the Astronomy Discussions at our new Astronomy meeting place...
The Space and Astronomy Agora
Re: Smallest Event Horison Possible

Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To
Posted by fred on January 29, 1998 18:54:28 UTC

: : :How small can a singularity be? How small is the smallest mass? What is "one" quanta of mass? Damned if I know, but it can't be all that difficult to find out. Ask those blokes at the birthplace of the web. : : : : : : : Well that is not the same thing, you need Enough mass to generate gravity strongenough to hold light to have an event horizon...

: : :No you don't. Mass has nothing to do with it. ANY mass that becomes a singularity has no dimension. Since it has mass but no dimension then it figures that its gravitational pull is at some point from the centre of the singularity strong enough to form a black hole. Albeit very very tiny indeed. The real question I suppose is how small a mass can a singularity be. Or to be precise, a fragment of a singularity, since a small one could not form all by itself. Either in the context of how small an object can form a singularity or how small can it be before the ordinary laws of physics of a larger body be compromised.Is it possible to have a really really small singularity. Particle sized fragments? If it is possible, then it goes without saying that that singularity will have a really really small event horizon - but it will have one.

: The event horison has everything to do with the gravitional pull, unless I misunderstand what an event horison is.

: The event horison is the point at which, as you travel towards the singularity, you must exceed the speed of light to escape its gravitational attraction. The reason you have to exceed the speed of light is to escape the gravatitional pull. If there is little mass, there is no, or little gravitational pull and thus you can easily escape it. and if the gravitational pull can not contain light (such as the gravitational pull of the earth) then there is no event horison. Even if you compressed teh earth into a singularity, you would not have an event horison around it. : :Not so. The pull of gravity is dependant on the mass and invesley the distance away from the mass. Given any mass with no spacial volume it is possible to get close enough to find an event horizon. Black holes could exist with a mass of only a few thousand tons ( A probable realistic limit) But in theory, could be even less.

Follow Ups:

    Login to Post
    Additional Information
    Google
     
    Web www.astronomy.net
    DayNightLine
    About Astronomy Net | Advertise on Astronomy Net | Contact & Comments | Privacy Policy
    Unless otherwise specified, web site content Copyright 1994-2020 John Huggins All Rights Reserved
    Forum posts are Copyright their authors as specified in the heading above the post.
    "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET"
    are trademarks of John Huggins