03-26-2017, 03:25 PM
(03-23-2017, 07:52 AM)selden Wrote: http://www.orionsarm.com/eg-article/4648f934c38f8
Cygnus Loop
English usage:
The supernova exploded about 15,000 b.c.e. years ago
should be either
The supernova exploded at about 15,000 b.c.e.
or
The supernova exploded about 15,000 years ago
Data:
Relatively recent studies have revised the position of the SNR to be closer (1470 ly), its size to be smaller (down from 150 ly to 90 ly) and the date of the explosion to be more recent: between 5,000 and 8,000 years ago.
See https://en.wikipedia.org/wiki/Cygnus_Loop#Distance
See also
https://archive.stsci.edu/fuse/scisumm/s...pstar.html
http://pages.jh.edu/~news_info/news/home...gloop.html
http://blair.pha.jhu.edu/cyglpstar.html
I don't think these changes would affect anything else in OA.
Changed as suggested. I picked a more exact date for the event, 6000 years a go, that falls within the range it's currently thought to have happened; scientists in the OA setting would presumably have nailed this down to at least the nearest hundred years if not to a specific year. Note that from the point of view of our fictional EG authors this still puts it over 15,000 years in the past.
Stephen