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Old 02-10-2011, 08:43 PM   #1
Masamune
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The SPACE (astronomy) thread

It seems like a lot of you are interested in this subject because of all the love for Carl Sagan I've seen in the pit. I searched and the last thread on astronomy is a couple of years old.
I'll start off with a few things that are probably familiar to a lot of you.

Scale of the planets and stars
Carl Sagan-Pale Blue Dot

and some pics

Each of those are galaxies as they were billions of years ago.


The Helix Nebula


Crab Nebula, it's a supernova remnant.


Milky Way


Cat's Eye Nebula

So yeah...discuss
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Old 02-10-2011, 08:47 PM   #2
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Just thought i'd leave some of this here

http://www.aolnews.com/2011/02/02/scientists-discover-solar-system-with-6-planets/?icid=maing|aim|dl2|sec3_lnk2|40960

http://www.youtube.com/watch?v=nBye...=1&feature=fvwp

http://apod.nasa.gov/apod/archivepix.html
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Old 02-10-2011, 08:56 PM   #3
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Hope this thread takes off
Bookmarked anyway.

http://www.planethunters.org/
^^ Found this in another thread on UG, you can search for exoplanets here
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Old 02-10-2011, 08:57 PM   #4
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Quote:
Originally Posted by Sammythedruggie
Just thought i'd leave some of this here
http://www.youtube.com/watch?v=nBye...=1&feature=fvwp

The whole concept of a fabric of space-time has always been kind of a mind-fuck for me.

Anyway here's something I just found, thought it was kinda funny.

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Old 02-10-2011, 08:57 PM   #5
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I like space, it's big and stuff.
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Old 02-10-2011, 08:57 PM   #6
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I have an astro lecture at 9am tomorrow morning.

Thanks for reminding me -_-'

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Old 02-10-2011, 08:57 PM   #7
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Carl Sagan's Cosmos is one of my absolute favorite books.
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Old 02-10-2011, 08:59 PM   #8
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This is my kind of thread. Aspiring Astrophysicist here, feel free to ask me shit.
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Old 02-10-2011, 09:00 PM   #9
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Pluto isn't a planet anymore btw =P
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Old 02-10-2011, 09:04 PM   #10
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Astronomy is sweet, I'm in an astromony course at my high school. It's mostly learning the night sky, but we do dive into the parts of the universe that can't be seen by the naked eye at times, and it blows my mind.
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Old 02-10-2011, 09:05 PM   #11
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Originally Posted by MAC2322
This is my kind of thread. Aspiring Astrophysicist here, feel free to ask me shit.

I have a question, it's about the whole red shift blue shift thing. Wouldn't you have to know what the wavelength of light was originally to determine how much it shifted? How do astrophysicists do that?
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Old 02-10-2011, 09:08 PM   #12
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Quote:
Originally Posted by Masamune
I have a question, it's about the whole red shift blue shift thing. Wouldn't you have to know what the wavelength of light was originally to determine how much it shifted? How do astrophysicists do that?


I could be completly wrong, but I think they use the absorbtion spectra of something we know (say its hydrogen) and then compare it to the spectra of the object, allowing the distance to be calculated.


Like I said I could be completlely wrong. Really good question though. Got any insight MAC?
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Old 02-10-2011, 09:09 PM   #13
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Quote:
Originally Posted by Masamune
I have a question, it's about the whole red shift blue shift thing. Wouldn't you have to know what the wavelength of light was originally to determine how much it shifted? How do astrophysicists do that?

You can compare the light of closer galaxies and seem them less red shifted, can't you? Otherwise there's things like spectroscopy and generally studying the objects to see what kind of stars are there, weather they be heavy in metals or otherwise.
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Old 02-10-2011, 09:11 PM   #14
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We watched the Pale Blue Dot in one of my anthropology classes.. i love that film. Totally puts life into perspective - basically nothing matters overall, it's just a bunch of tiny situations that make up an entire puzzle, and that puzzle makes up an even bigger puzzle. it's crazy
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Old 02-10-2011, 09:12 PM   #15
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Old 02-10-2011, 09:15 PM   #16
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Quote:
Originally Posted by Masamune
I have a question, it's about the whole red shift blue shift thing. Wouldn't you have to know what the wavelength of light was originally to determine how much it shifted? How do astrophysicists do that?
There are absorption lines in the spectra of stars which we can look at.

For example, we know that the Hα line has a wavelength of 656.28 nm. By measuring the wavelength of this line in the spectrum of a particular star and how it's shifted from this known value, we can determine it's velocity relative to us.



I explained that poorly, but I hope the meaning is clear.
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Old 02-10-2011, 09:16 PM   #17
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Old 02-10-2011, 09:18 PM   #18
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I love space. It's one of the most interesting topics to think about because, hey... it's the whole universe. Everything else concentrates on something on Earth... studying space is studying the entire universe and existence.
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Old 02-10-2011, 09:19 PM   #19
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Quote:
Originally Posted by Sammythedruggie
I could be completly wrong, but I think they use the absorbtion spectra of something we know (say its hydrogen) and then compare it to the spectra of the object, allowing the distance to be calculated.


Like I said I could be completlely wrong. Really good question though. Got any insight MAC?



Yes, actually.

Because we know what kind of stuff stars and planets are made of. Different elements (in this case mostly hydrogen, helium and sodium) emit and absorb different light frequencies (and radiation). By comparing the light being emitted to the light that would be emitted if it weren't moving we can determine how fast it's moving.

EDIT: EuBoat said it exactly right a few posts up, but a bit more technically.
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Old 02-10-2011, 09:21 PM   #20
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Quote:
Originally Posted by EuBoat
There are absorption lines in the spectra of stars which we can look at.

For example, we know that the Hα line has a wavelength of 656.28 nm. By measuring the wavelength of this line in the spectrum of a particular star and how it's shifted from this known value, we can determine it's velocity relative to us.



I explained that poorly, but I hope the meaning is clear.

Yeah it's clear, thanks.


http://www.youtube.com/watch?v=xE7x...feature=related
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