Happy Halloween

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: Speed Of Gravity

Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To
Posted by Herb S. on March 5, 2000 02:54:11 UTC

: Does gravity travel instantanious, or does it travel at a certain speed. And can you detect what is inside a black hole, or at least the mass distribution, by measuring the gravity of the hole? What if you drop something into the hole and measures its position by the use of its gravity? what will then be detected? That the object has the same position as is given by the light emitted by the object and the object being "freezed" on the event horizon, or will something else be detected, for instance the objects position inside the event horizon.

: If gravity travels with a finite speed, can there exist a gravity field so strong, that gravity can't escape, and what happens then?

Gravity travels at the speed of light. The mass distribution of a black hole cannot be ascertained, only its total mass. As the next comment of yours indicates, to an outside observer, the object is never seen to fall in, i.e. it appears to freeze at the event horizon. The simple answer to your last question is that the gravity field around a black hole is also frozen, and therefore remains in place.

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 1994-2019 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