Happy Halloween

God & Science 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 | God and Science | Post
Login

Be the first pioneers to continue the Astronomy Discussions at our new Astronomy meeting place...
The Space and Astronomy Agora
Net (total) Energy Is Zero. But There Are Pos And Neg Parts.

Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To
Posted by Alexander on June 28, 2001 17:52:56 UTC

Say, gravitational potential energy is always negative (gravity is attractive force), so two (or more) attracting bodies separated by some distance and NOT moving have NEGATIVE net energy. Moving and NOT attracting bodies have net POSITIVE energy. Moving And attracting each other bodies may have net energy to be negative (say, orbiting each other bodies), or positive (say, moving with more than escape velocity) or exactly zero (moving with escape velocity).

It turns out, that universe is moving with exactly "escape velocity" so to speak - negative gravitational potential energy of Universe is equal to all positive energies in it (dominating by its motion plus rest-mass energy mc^2), so net balance is zero.

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 1994-2018 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