A-L-E-X, I have no idea! Maybe 12 or something like that?

How do I use Astrobin for that? I just signed up, but I see no map or anything like what you mention.

pzampella , that is amazing! What even is there to critique? :) Everything looks crisp and the colors and nebulosity came out beautifully. And it looks very natural, not over-processed at all. Love it! Thank you,  Watsisname ! I really liked it, but maybe there is something that some of the experts...

Last week I achieved one of the most beautiful astrophotos I have ever taken. It is the region of the Sagittarius bow, where the center of pur galaxy lies. These are 40x60s light frames stacked and processed in Pixinsight along with darks, dark flats, flats and bias frames. https://lh3.googleusercon...

Hi! I recently decided to create a blog where I will be posting my photos, with the idea of making it a place where it is possible to see the progression. The main idea is to make it a place for discussion and learning, and also to help those who are starting in the astrophotography world. Here ther...

Astronomers discovered most nearest black hole just 1000-light years from Earth that can also seen from naked eye  https://www.eso.org/public/news/eso2007/ the black hole can be seen with the naked eye? or the main star of the system can? Given the characteristics of this system, it is not even pos...

Already bought the collimation laser, but with the quarentine it won't arrive for another month at least. And I won't be back where my telescope is until August.

Hi! I am here again asking for your astro-help... As I mentioned in previous posts, I have been trying to get some nice shots of M81 and M82. I had some noise issues solved with dithering, but now I see that I also have a collimation problem with my Skywatcher Blackdiamond 150/750 . Today I decided ...

I've never heard before of dithering, and while looking for a solution for this noise issue, I find it everywhere. I was think about doing it for my next set if pictures. I didn't know there was a dithering option in Pixinsight. I guess I can try using it for stacking too, but I always though that D...

Hey! I am trying to work in M81 - M82 using my Skywatcher Blackdiamond 150/750 telescope, and my Canon T5 camera. I got about 4 hours of data, and I stacked it ussing DSS with default recommended settings. Total of 4 sessions divided in 4 groups: ⋅  Main group: 90x90s (800 ISO) lights, 20 ...

Hello! By buying this 0.9.9 version, will I have access to any future releases or should pay also for those?

Thank you Watsisname! Always with the right answer! 

Hello guys, It's been a while since I played with my camera at night, but since I'm on vacations in Alicante I decided to give it a try! This is the result of the 15x1min pictures from last night: this image's protagonists are the Lagoon Nebula, Trifid Nebula and some star clusters, alo...

Thank you very much for your answer, Watsisname!

Also, the paradox that you mention in the end is very intriguing.

Gnargenox wrote:

Could it be possible that they are bowling balls rather than cannonballs perhaps?

Hahahahaha yes it is. Let's just assume that the portals are wide enough (and that they are all perfectly align, of course).

Yesterday I had a thought experiment, and I would like to share it and ask about it. Let's assume that we are in a place next to a random planet, and in that point the gravitational acceleration is 1 m/s 2 (just to make calculations easier). In that place, Dr. Stephen Strange created two portals: th...