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
Login

Be the first pioneers to continue the Astronomy Discussions at our new Astronomy meeting place...
The Space and Astronomy Agora
I Read It In A Book...

Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To
Posted by Mark on October 8, 2001 20:46:59 UTC

>>>Time is scalar (not a vector), right? Same as mass, work, temperature, etc.Now, replace t to -t in equations of motion, and you'll simply get motion in opposite direction. (Replace x to -x, and it is the same result. Just because v=dx/dt. Changing sign of EITHER x or t changes velocity sign.) So, from mathematical point of view motion "back in time" is the same as "back in space". Nothing unusual. Negative momentum of a photon (=attraction) instead of positive (repulsion). But is it indeed backward motion in time?

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 1994-2024 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