“Seth material” search engine (Jane Roberts)

Ordinarily we think of mass as meaning the bulk and/or weight of an object. In classical physics the amount of matter in a given object is measured according to its relation to inertia, which in turn is the tendency of matter to keep moving in the same direction, if moving, or to stay at rest if at rest. An object’s mass is arrived at through dividing its weight by the acceleration caused by gravity.

11. According to modern cosmology, a black hole consists of the remains of a very massive star (one much larger than our own sun, for example) that’s suffered complete gravitational collapse after the death of its nuclear fires. Such an object is very small and unimaginably dense; within it, time and space are interchangeable. It’s also quite invisible, because its surface gravity is so enormous that not even light can escape from it. (Yet, in Volume 1, see the comments in Note 4 for Session 688, on the possibility of light radiation from the “event horizon” of the black hole.) So far just two black holes have been tentatively located, although many of them are believed to exist.