Back to Home

Blackholes 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 I | Post

Be the first pioneers to continue the Astronomy Discussions at our new Astronomy meeting place...
The Space and Astronomy Agora
Relativity Of Event Horizon

Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To
Posted by Alexander on February 24, 2001 21:45:18 UTC

Ok, lets say that the far away observer sees an event horizon from which photons try to escape. Seing that no photons come from beyound certain radius R he calls it event horizon for far away observer (EHFO). Now, those photons lose their energy as they ascend from EHFO and lose ALL their energy at infinity. But close to EHFO they still have some left, thus are visible (but red-shifted). So, ANOTHER observer closer than the first one will see them. And he will see even photons originated slightly CLOSER to black hole than R (EHFO). So, for him the event horizon (beyond which no photons are seen) will be SMALLER. Thus, the closer you are to black hole, the smaller IN YOUR reference system is lateral size of event horizon.

If far away observer sees you being right next to the EHFO, he also you measuring the distance to EHFO with a meter stick which gravitationally shrunk, thus he sees that YOU have to use more meter sticks to reach EHFO (in fact, infinite amount of them as you approach EHFO).

Follow Ups:

Login to Post
Additional Information
About Astronomy Net | Advertise on Astronomy Net | Contact & Comments | Privacy Policy
Unless otherwise specified, web site content Copyright 1994-2023 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