Archived posting to the Leica Users Group, 2001/12/05
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]I can recall from my days in grad school ideas about objects in the universe that effectly were "beyond infinity" away. There are representations of space-time called "conformal space-time diagrams" where it is possible to trace a path to objects that are visible to us, but from which otherwise we are disconnected. I think the term was that they are at "null infinity" (this is all from memory going back about 25 years, so I'm a bit rusty). These objects would theoretically be visible in the night sky, but if we were to aim a rocket ship at them, and travel at any speed less than the speed of light (and which is all we can ever hope for), we would never be able to reach them. I have no idea if current ideas of cosmology still consider these ideas viable. dan c. - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html