We used M39 in an Observational Astronomy class to test the brightness limit of our 0.5m telescope -- the students were given a list of stars (magnitude 9.7 to 14.2) and a map and they had to identify increasingly dimmer stars by eye until they couldn't see them. To orient themselves, I told the students the stars in the center of the cluster form a "coat hanger" shape. Later, the students imaged the same field with a CCD using longer and longer exposure times to determine how dim of a star you can see with instruments.
There was a case a few years ago where a criminal used a spiral distortion photoshop feature to distort a face in a photo he released. With a lot of effort, police were able to undo the process and obtain a recognizable face, leading to an arrest. And Dustin of Smarter Every Day has a video where swirled liquids with certain properties were shown to be "unswirlable". So determining the sun's cluster may be beyond current techniques, but never say never.
In both those cases though the 'liquids' didn't mix, only distort. Open clusters seem to scatter in all directions and I think the chaos involved may be quite the hurdle to overcome.
@@garethdean6382 The Sun has done several laps around the galaxy and passed through the density waves of the spiral arms multiple times that. So, "not through this method" is the key phrase I think. Maybe elemental and isotopic fingerprinting?
Mike another great job. I love these Messier videos you folks at Nottingham are doing. They are top drawer. I spent a year teaching in your country at Tynemouth College, North Shields where l taught A & O-level physics andcan astronomy general studies course...not sure that's the correct name ad it's been so long since 1979!
There was a video Destin at SmarterEveryDay did a while back on reversibility of highly viscous fluids, I wonder if the same concepts could be applied here to hit rewind on the milky way to identify the birthplace of the sun.
The image at 1:00, is this LH 95? I ask because I have a poster of it, but I've never known what it is called. Edit: I used a reverse image lookup on a screenshot of this video to get my guess.
Really nice vid and lovely to know the current cutting edge research coming out from Gaia data. (as an aside... It is my understanding that the Pleiades stars are actually moving through an unrelated, pre-existing patch of nebulosity giving them the time to produce a lovely reflection nebula... it's a coincidence and the nebulosity isn't their birth nebula. Has the current wisdom changed?)
Are the sun a faster moving star or slower than averege , if faster then we might catch up to those that was born in the same cluster if slower they might catch up us and its not likely the sun has orbited more than about 25 times around milky way .
So M39 didn't have enough 'dark matter' to coalesce, or the 'dark matter' was stripped away by a passing heavier structure, or the 'dark matter' flow/tide superstructure of the universe was too strong and it never had a chance?
Couldn't you take Gaia data, and calculate it backwards to the original form of our galaxy? Or is there information lost by one state being reached in two different ways?
@@jamesrockybullin5250 Yea i saw that after i commented, cause you know, youtube just loves NOT to notify people of new videos to channels your subbed to, so frustrating, but thank you, i did.
Yeah. JPEG-compression really makes a mess of all that high frequency information. Made me wonder, given that there are a lot of astronomical images and they will share a lot of the same properties, there has to be algorithms developed particularly for this use, and indeed there are quite a few.
Astronomical images are in much better formats than jpeg. I see FITS being used a lot. For analysis usually some dataset like Gaia is being used and not the image files
@@SleeveZipper well yes, RGB doesn't quite do it for images that were taken with narrow-band filters at various wavelength. However, for some reason, most of the images in this video look like total garbage.
I love your videos, so I'm asking you to please upload on alternative platforms. I'm deleting my RUclips account, because of the free speech restrictions. We should fight and defend free speech! I will miss your videos. Sorry for my unsubscribe!!!
[00:52]. "And then there are the open clusters, which are somewhat *'Messier'* collections of stars".
Intended pun there?
Prof Merrifield's standing pun. It will never grow old as long as the universe is around.
He slipped it in again at 8:02.
Yeah, globular clusters may be Messier objects, but open clusters are the messiest of them all.
@@CAPSLOCKPUNDIT My den is the messiest object in the observable universe.
One of the great but under appreciated thing about this channel is how they give all the proper links to resources they use in the video!
1:14 Great analogy Brady. I really like that and will use it my self.
Awesome! I just observed M39 a few days back and was disappointed it was missing in the playlist :)
anyone else wishes these videos to be longer ?
No, noone else.
Brady appeared particularly concerned about the corona part.
LOL, "messier collections of stars" @0:55!
When you have catalogued all the "messier" objects, can you please move on to the "messiest" objects?
Nice questions Brady.
I like to think that the light source that we see shining through the door's crack @3:30 is a star that the Professor keeps in his closet.
I see the Professor uses a Unistellar EV Telescope. I just bought one and I am seeing more now than I have ever been able to.
We used M39 in an Observational Astronomy class to test the brightness limit of our 0.5m telescope -- the students were given a list of stars (magnitude 9.7 to 14.2) and a map and they had to identify increasingly dimmer stars by eye until they couldn't see them. To orient themselves, I told the students the stars in the center of the cluster form a "coat hanger" shape.
Later, the students imaged the same field with a CCD using longer and longer exposure times to determine how dim of a star you can see with instruments.
I was just wondering how it things would be effected by the new lockdown. Good to see you both appear well.
Thanks, Brady and Prof. Merrifield. Really interesting!
There was a case a few years ago where a criminal used a spiral distortion photoshop feature to distort a face in a photo he released. With a lot of effort, police were able to undo the process and obtain a recognizable face, leading to an arrest. And Dustin of Smarter Every Day has a video where swirled liquids with certain properties were shown to be "unswirlable". So determining the sun's cluster may be beyond current techniques, but never say never.
In both those cases though the 'liquids' didn't mix, only distort. Open clusters seem to scatter in all directions and I think the chaos involved may be quite the hurdle to overcome.
@@garethdean6382 The Sun has done several laps around the galaxy and passed through the density waves of the spiral arms multiple times that. So, "not through this method" is the key phrase I think. Maybe elemental and isotopic fingerprinting?
I was going to scroll on, but then i remembered that this man always has something interesting to say
Mike another great job. I love these Messier videos you folks at Nottingham are doing. They are top drawer. I spent a year teaching in your country at Tynemouth College, North Shields where l taught A & O-level physics andcan astronomy general studies course...not sure that's the correct name ad it's been so long since 1979!
nice indeed
There was a video Destin at SmarterEveryDay did a while back on reversibility of highly viscous fluids, I wonder if the same concepts could be applied here to hit rewind on the milky way to identify the birthplace of the sun.
Nice
The image at 1:00, is this LH 95? I ask because I have a poster of it, but I've never known what it is called. Edit: I used a reverse image lookup on a screenshot of this video to get my guess.
Is there a video yet discussing ORCS ('Odd Radio Circles')?
I know there's not much information yet but they seem pretty fascinating! Thanks
How likely is it for two different clusters to have similar color magnitude diagrams?
Don’t worry Brady, some day we’ll find the sun’s siblings. Just don’t hold your breath for a family reunion 😄
One question that always boggles my mind is where did it all start..
Nice.
Really nice vid and lovely to know the current cutting edge research coming out from Gaia data.
(as an aside... It is my understanding that the Pleiades stars are actually moving through an unrelated, pre-existing patch of nebulosity giving them the time to produce a lovely reflection nebula... it's a coincidence and the nebulosity isn't their birth nebula. Has the current wisdom changed?)
"somewhat messier" ha!
love the vid m8
Are the sun a faster moving star or slower than averege , if faster then we might catch up to those that was born in the same cluster if slower they might catch up us and its not likely the sun has orbited more than about 25 times around milky way .
So M39 didn't have enough 'dark matter' to coalesce, or the 'dark matter' was stripped away by a passing heavier structure, or the 'dark matter' flow/tide superstructure of the universe was too strong and it never had a chance?
Open clusters are generally inside the galaxy and dark matter is not a big influence.
nice vid
0:55 "a somewhat messier cluster of stars"
And that's why they're called Messier objects haha
Couldn't you take Gaia data, and calculate it backwards to the original form of our galaxy? Or is there information lost by one state being reached in two different ways?
TLDR from the channel :
Things are getting messier
Brady, When are we gonna get a new "Periodic Video"?, i'm craving some brain fuel from the Professor.
Have you watched the new video about nitric acid? Niel does some pretty cool demonstrations.
@@jamesrockybullin5250 Yea i saw that after i commented, cause you know, youtube just loves NOT to notify people of new videos to channels your subbed to, so frustrating, but thank you, i did.
One day Brady, one day we will return home to our cluster.
I wonder if one day they might be able to somehow extrapolate the history of the universe
1:04 I wonder who takes such beautiful pictures and then uploads them as an artifacty mess.
Yeah. JPEG-compression really makes a mess of all that high frequency information.
Made me wonder, given that there are a lot of astronomical images and they will share a lot of the same properties, there has to be algorithms developed particularly for this use, and indeed there are quite a few.
@@aksela6912 but wouldn't you share astronomical images in a lossless format for serious purposes? Meaning, anything other than for a web browser?
Astronomical images are in much better formats than jpeg. I see FITS being used a lot. For analysis usually some dataset like Gaia is being used and not the image files
@@SleeveZipper well yes, RGB doesn't quite do it for images that were taken with narrow-band filters at various wavelength. However, for some reason, most of the images in this video look like total garbage.
@@unvergebeneid Don't forget that RUclips itself applies a lossy compression to the videos
☝️🤓I love this.
🙏💚
moosh love
mau
Our sun is part of the Brady cluster.
Brady telling professor of astronomy he may use a ‘professional’ picture! Not very respectful!!!
They know each other so well by now it isn't disrespect...they've become colleagues and might possibly be friends of sorts. It's perfectly OK. 😊
He had a professor picture, surely that should have been enough?
I love your videos, so I'm asking you to please upload on alternative platforms. I'm deleting my RUclips account, because of the free speech restrictions. We should fight and defend free speech!
I will miss your videos. Sorry for my unsubscribe!!!