"Professor Goddard does not know the relation between action and reaction and the need to have something better than a vacuum against which to react. He seems to lack the basic knowledge ladled out daily in high schools."
--1921 New York Times editorial about Robert Goddard's revolutionary rocket work.

"Correction: It is now definitely established that a rocket can function in a vacuum. The 'Times' regrets the error."
NY Times, July 1969.

— New York Times

c23

c23

Caldwell 23

 

Wow

Super
Why stars are so Blue/Cyan?

why so blue

I think they are blue because the exposure took one hour and twenty minutes in total. The scope was going slowly out of focus due to temperature shift. Since blue was the last exposure, the blue image had the more bloated stars. When I combined this resulted in a blue halo/cast around every star.

min filter

Select the stars
apply min filter
fade the effect
Will be a LOT less bloated
Try only for the B channel 1st