M33 - The Triangulum Galaxy

M33, also known as The Triangulum Galaxy is the third largest galaxy in our local group of 30 galaxies and is located about 2.7 million light-years from Earth. You can see a few faint background galaxies outside of our local group which are over 100 million light-years from Earth. The galaxy core is yellowish because it is filled with older sun-like and smaller stars which emit light in the less energetic yellow and red part of the electromagnetic spectrum. The outer regions are more bluish because they are filled with very young short-lived much larger stars which emit more energetic light in the blue end of the electromagnetic spectrum. The bright reddish regions are regions of hydrogen gas that are being ionized by the brand new hot stars being born inside of them. There are also a few bright blue regions that are regions of hydrogen gas that are not ionized, but are reflecting light from bright stars in front of the gas back toward Earth.

Image acquisition and processing information:

Date: September 29th, 2019
Telescope: Celestron Edge HD 14" telescope using a Hyperstar v3 lens
Mount: Celestron CGE Pro
Camera: ZWO ASI-183 MM Pro monochrome camera equipped with a Baader UFC 2" Filter Slider
Image acquisition software: Sequence Generator Pro v. 3.0.3.169
Exposures: 27 two-minute exposures binned 2x2 using a IR/UV cut filter for luminance, 13 one-minute exposures each binned 3x3 using red, green and blue filters and 14 two-minute exposures binned 3x3 using a Baader Highspeed Ha filter
Guiding: Telescope: AstroTech AT72ED, Camera: Starlight Xpress Trius Pro 814 CCD, Software: PhD2
Image processing Software: PixInsight v. 1.8.5