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Mute City2363 Posts
On April 27 2015 15:09 TheEmulator wrote:Show nested quote +On April 27 2015 14:45 thecrazymunchkin wrote:
I took an astrophysics module as part of my maths course, but was too shit to think about continuing on that line though.
It's really interesting stuff though; yet another part of applied maths I wish I was more competent at :[ Yeah it's extremely daunting. I've taken some physics/astro classes as electives and I think I could have managed to fight my way to a degree in it, but it would have been really hard, and I would never compare to some of the talented people in those classes who just understood stuff like it was no big deal.
My friend's on her PhD course right now; published a paper during her undergraduate degree whilst we were studying for finals like it was a regular thing to do :/
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Very nice job Teo  it also makes me proud that you are italian ^^
Maybe one day I will do something similar concerning some areas of Philosophy  you inspired me!
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Lorning
Belgica34432 Posts
Very nice read~~
I'm also planning to go for Astrophysics and I'm really excited about it
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im amazed about the colors, here i am always thinking that the universe is white/black like the old photos and then bam! the most amazing colors are there. thx for the blog!
i cant event ... the pillars ... holy shit... i dont even x.x
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Tebellong44238 Posts
Well, all the colours are photoshopped in, the images certainly aren't been shot 1:1 across the whole visible light spectrum
but they are based on something I think. Translated to visible spectrum because... thats how humans can process it. As somebody mentioned, the images used for science don't look like that at all, but they aren't worth releasing to the public in general.
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Italy12246 Posts
They are usually a mix of several bands, which specific ones depend on the image:
http://hubblesite.org/gallery/behind_the_pictures/
Because sources tend to emit across a much bigger band than just the visible one, technically the universe has more colors than we can possibly perceive
Scientific images are black and white; the revelators used aren't actually sensible to color but simply count photons arriving (usually), so in order to get colors in an image you need to take a pic of the same source with different filters.
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Mute City2363 Posts
On April 28 2015 00:57 Lorning wrote:
Very nice read~~
I'm also planning to go for Astrophysics and I'm really excited about it
Go for it!
Or at least go for something maths / physicsy
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Wow I actually spurred a conversation, makes me smile.
It was an undergrad thesis, don't go looking too hard at it . Even at the time I did the work it was very fringe to think exploding PBHs could explain even a portion of short GRBs. Basically the idea is that the PBH light curve is something like exp(alpha*t) where alpha is the number of species the PBH can create at the event horizon. For the vast majority of it's life alpha is pretty constant, but once the PBH temperature gets to a point where it can feasibly produce quarks alpha step changes upward by an order of magnitude or something like that. This could cause a theoretically high luminosity for some vanishing amount of time.
I think I remember that PBHs that would be exploding today would have had an initial mass of ~10^15 g. I think during the last 5 seconds they had ~1 solar luminosity and maybe a few orders of magnitude larger than that for the last 1 second. Way too faint to be seen at extra-galactic distances as was the gist of what my thesis was looking at. Still, was a great problem to sink my teeth into as a student.
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Italy12246 Posts
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So much science. I love it. Thanks Teoita for the blog, and thanks to everyone for the discussion. It was a very interesting read ! If you have more, keep it coming mate <3
Now it's time to turn towards eonrulz's blog :D
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While I don't have the rigorous mathematical or scientific training to fully comprehend astrophysics your blog post definitely helped made it simpler. And of course, stargazing or looking at pictures of galaxies light years away is one of those things that should bring awe to the mind of anyone.
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I remember reading that the sun would keep burning for another 6Billion years, 20 years ago as a kid. For a second there I thought "How can there still be 6 billion left, after such a long time". Then i facepalmed.
Well, thats one of the fascinating things about space - how incomprehenseably big everything is. 6 billion is a number few people can really imagine (sure, as something on paper, but what it really means)
great post!
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EPT
