12/20/2025
The “Deer Lick Galaxy Group” and “Stephen’s Quintet” in LRGB-Ha
The most prominent galaxy in this image NGC-7331 was first discovered in 1784 by the famous astronomer, William Herschel. This galaxy is very similar to our own galaxy in size, shape, and type. NGC-7331 is about 45 million light-years from Earth! We think this looks extremely similar to how the Milky Way would look from a very far distance and is commonly referred to as our twin galaxy. The “smaller” galaxies that are close by in this image, actually aren’t close at all. NGC-7335, NGC-7336, NGC-7337, and NGC-7340 range anywhere from 7-9 times further away. That puts thse other galaxies anywhere from 287-365 million light-years away!This is often misunderstood due to it being commonly referred to as a “galaxy group” when in reality, they aren’t grouped in the slightest. We see them initially “grouped” as simply an illusion of alignment from our perspective.
In the lower left area of the main image, you will see a legitimate galaxy group know as the extremely famous “Stephen’s Quintet”. This is a very active galaxy group creating this beautifully violent collision of these massive structures. Besides the brightest blue galaxy, NGC-7320, they are so close that their own gravitational fields are effecting each other. You can visually see this as they are tied together and ripping each other apart. NGC-7320 is an actually multiple times closer at “only” 40 million light-years, but it is much smaller then galaxies like our own, the Milky Way. The other four massive structures in this group are NGC-7317, NGC-7318A, NGC-7318B, and NGC-7319. This group has been imaged by so many different instruments from all over the world. The current most fanous image of course is the James Webb Space Telescope, but was first observed in the highest detail by its predecessor, Hubble Space Telescope. This galaxy group is special in so many ways, besides just how unusual it is structurally.
Bonus Image:
I was running some scripts just to see if there was any odd things in this deep field image that I don’t normally get to see and I found something really cool! I normally don’t share this sort of things because it is genuinely just super nerdy stuff. Anyway, I was running some scripts to see if there were some really faint and distant objects and there definitely is! With the help of data from Hubble and the Chandra X-Ray telescope, there is an extremely faint signal of a Quasar behind the galaxy NGC-7319.
I will briefly explain what a Quasar is. A Quasar is a hyper-active galactic nucleus (center of a galaxy) that is extremely bright and fueled by a super-massive black hole. The super-massive black hole has dense matter at the center of the host galaxy spinning very fast around the accretion disk creating heat and energy. This process creates an amount of energy that forces a release of pressure in the form of jets that radiate out to its respective north and south. It shines so bright it can outshine its entire host galaxy by multiple times.
The Quasar behind NGC-7319 is at a remarkable distance… the galaxies in this image alone are enough to make your mind boggle at distances ranging from 40 to 365 million light-years….but this TRULY will make you think. This Quasar has a redshift measurement of 2.11 which calculates the distance to 10.58 BILLION light-years away. Yes, BILLION light-years. The Sun, Earth, the literal entire existence of our own Solar System is only 4.5 Billion years old…..This means that the light from this Quasar was OVER half way ALREADY HERE before our Solar System was EVEN BORN!!! I can’t speak for anyone else, but this makes my brain itch. Absolutely mind blowing. If you read this far, how does this make you feel/think? I would absolutely love to see anyone’s thoughts, questions, or concerns in the comments! Please don’t hesitate!
Thank you all for looking and geeking out with me! ❤️