Recent content by rv

i used the search option to look for saturn but did not find any matches. just read in a local paper that saturn will be visible to naked eyes this january is it true? if so do give me a link

cosmoboy, the review articles require a password to get to www.journals.uchicago.edu. but in the feynmanphysics etc i read about the 10 unsolved problems. thanks to me most of them sounded pretty vague!

hi! all i am also interested to know the answer to- what kind or what field of astronomy/cosmology can a person work who is only connected to the world with a pentium 4 processor, perhaps a few good books and of course just a pencil and paper-may be general theory of gravitation might...

Thank you Garth and SA for defining proper time, and it may be an obsession but here is yet another question about it; consider black holes and schwarzchild solution: the solution becomes singular at r=2m called critical radius and after some calculations we find that , the proper time for a...

i am new here, but i do have a question about proper time what do the following mean- 1."the proper time is the time as seen by an observer in the rest frame of the particle" 2. "light signals in four dimensions also move along straight lines but the proper time along the line is zero"