posted on Jul, 3 2023 @ 04:39 PM
a reply to:
rounda
It is not visible light (“what you see in an image”) but the frequency that individual elements absorb. So a hydrogen molecule always absorbs this
frequency (a line in a spectrograph). Over the years a whole catalog of chemical absorption frequencies has been constructed.
Now, just by spectral lines, you can classify the type of star, general age, distance, the visible light it emits, its favorite Beatle, etc… even
with red/blue shifts. All because of the speed of light in a vacuum being constant.
The filters you are talking about are good for “recreating” a photo from the raw data collected.
Hope that helps!
The gravity wave of the OP are extensions of the news making LIGO neutron star merger. Like stringing together several radio telescopes to make a
virtual radio telescope with a larger aperture, they have done the same but with stellar objects and gravity! Which is pretty cool from a “concept
to reality” realization.