Astronomy ChatroomAre we able to notice changes in far-away deep sky objects like a nebula or a galaxy?
There is one question I ponder about since I started with astrophotography: I know I am looking way back in time. I am sure the deep sky objects change all the time. A nebula expands at certain speeds, a star is moving along, material is moving or hit by something else, objects might interact, etc. . So when are we able to notice changes in light-years-away deep sky objects like a nebula or a galaxy? When I take a long-term exposure of an object and repeat the same shot a year or more later, shouldn't there be a small noticeable difference? Or not because the target is light-years away and appears so small when observed from the earth? If I combine long-term exposures taken every year to a single image I think I am falsifying the object somehow. Or is it simply not possible to detect seemingly small changes with the technical tools available for the moment? Or could it be the distant targets movements are way to small to be detectable by any observer on earth?
Astro Encyclopedia2 special stars in the gemini constellation.
Castor and Pollux, known as the Dioscuri, are heroic twin brothers from Greek mythology, sons of Leda, famous for their inseparable bond, bravery, and exploits with Jason and the Argonauts and the Calydonian Boar Hunt; they became the constellation Gemini after Pollux shared his immortality with the mortal Castor, allowing them to spend half their time in the underworld and half in the heavens, symbolizing protection for sailors and warriors. #Castor and Pollux #
Seestar Official GroupIn how cold have you used your seestar?
So, in how cold have you used and has there been any problems, breaking plastic etc. I,ve been using couple of times in about -17'C with powerbank for about 4-5 hours without any problems. I know manual says that -10'c the limit
NEW
Explore
CreateMy Group
Question List
1望远镜的目镜选择？
2如何在城市里（六级区）出摊打野拍深空？而且新购入的设备总价不超过一万？
3Pixinsight - is it worth it ? How is the learning curve ?
4Sun Guardian Badge - best tips?
5Help with the Moon Phase Tracker?
6What are y’all’s favorite deep sky objects?
7Sirius Warrior - new badge / new questions !?
8Who’s going to AstroCon2025 at Bryce Canyon?
Thought List
1whitch tools do you use in siril for processing?
23iatlas how can I see from Scotland next
3我有一个手搓的折反望远镜，口径117mm，焦距900mm，可以拍什么？
4Seestar S50 advert -fan made .......
5Lego made solar finder
6关于超级蓝月亮，全面的问题解答(Super Blue Moons: Your Questions Answered)
7Sirius Warrior Acquisition Group (SWAG)
8关于月食的一切，类型、图像以及发生的频率。
9Comparison of S30 v S50 Rosette Nebula
10Nice garbage container always polar aligned containers on wheels Pull and close up.