Chris Impey, 2015, W. W. Norton, Bvtn Lib 629.4011 IMP

Prof at U. Arizona

Dyson Shell equivalent - circular accelerator ring and thinsats - up to 0.7C? Slower is probably better. Can a travelling thinsat slingshot around a black hole and return and slow down? The nearest observed black hole is 1600 light years away, Sagitarrius V4641. Power - a shell 100 AU in diameter, and 1 micrometer wavelength, can focus on a "spot" 200 m across 2000 light years away. Not for the impatient ...

Billion year civilizations will be a million times more "visible" than thousand year civilizations, and twenty million times more observable than 50 year "radio" civilizations.

Beyond (last edited 2015-10-09 18:46:13 by KeithLofstrom)