nebulae

The questions is how one can subtract the stars without also subtracting the nebulae.

Stellar clusters, nebulae, Bok globules, and young star systems are where you would expect this kind of action.

But no way could the Earth's rotation during a single night move background stars out of a nebulae.

Unfortunately that is a high radiation environment due to Sagitarius A* (the mega-black hole at the center of the galaxy_ and all the nebulae the hole is dragging in.

However, nebulae, or even the outline of the Milky Way, are difficult or impossible to see.

As the Earth rotates over the course of the night, the background stars and nebulae move as a single unit, no?

The reflecting pool of crude shimmers with thin-film interference like nebulae on the celestial expanse.

Would any of those nebulae show such beautiful colors to the human eye if we were only closer?

It focuses on the brightest galaxies and nebulae, interesting clusters, and binary stars.

Galaxies, nebulae, and such are much further away than Pluto, but that is more than made up for by how mind-boggingly large they are.

Absorbtion spectra tell us about the materials these nebulae are composed of.

But it was a simpler theory than the idea that nebulae were some new kind of object, and it turned out to be correct.

Light pollution only has an impact on observing "faint fuzzies" - galaxies, nebulae, and other objects that are, well, faint and distant.

There were those who said that the theory that "nebulae" were distant galaxies should be dismissed according to Occam's Razor, because it meant vastly multiplying the number of galaxies, stars etc.

I live in a bortle 9 area (downtown) and unless I bring out my 20" dobsonian I'm mostly visually limited to double stars, planets, bright clusters, and extremely bright emission nebulae such as M42.

The fewest-assumptions version of MW seems to lead to such an explosion of "stuff" that there might well (in our optimal version of Occam's razor) exist some term that doesn't show up in evaluating nebulae, but dominates in considering MW.

I'm afraid to ask about the nature of the TGPs lest I get directed to watch for secret signs to appear in the Orion Nebulae.