Quote:
Originally Posted by Peter Ward
I was gobsmacked by today's NASA APOD.
problem was they ran a similar image a couple of years back and it simply didn't mesh with what was posted today.
Image link of both here
I'm interested to hear explanations about why such a disparity. |
Here are the full details of both images as descibed by the astrophotographers who captured them:
https://www.flickr.com/photos/51743649@N07/52426245654/
https://www.astrobin.com/1d8ivk/
As to why the discrepancy, I would assume it has to do with this comment on the more recent photo that was APOD:
"
IMPORTANT NOTE
The [OIII] emission arc appears very bright in the images - but it is an extremely faint object that can only be adequately visualized by special subtraction techniques, since the signal in the unprocessed condition is almost completely outshone by the light from the galactic halo of M31."
If it is heavily processed through special subtraction techniques then it would surely distort alot of the details in the image you would normally expect to see and correlate with the more naturally processed earlier APOD image.