On Monday, 1 February 2016 15:10:40 UTC+1, Sam Wormley wrote:
What are gravitational waves?
https://www.youtube.com/watch?v=rJ4U2VdKlW0

We discuss what gravitational waves actually are, what produces them,
and some of their properties. Part of a continuing series on the
NANOGrav project.


We all know that an object usually spirals into the mass in the center of the rubber sheet.

But, what happens when you try to go UNDER the massive object?

What's going on down there?

Is it really full of 1461's spent arguments for rabid lunacy?

Or does his rubber sheet have special properties on relativistic visits to this gravitational "underworld" outside normal visiting hours?