03-23-2017, 07:52 AM
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.
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.
Selden