Astronomy Q&A game

[Shadow]

Ummm...Chroot are you going to post?

 

[marcus]

Originally posted by Shadow
Ummm...Chroot are you going to post?

Shadow, do you have a question you want to post?
The rules say something like if the thread is inactive for three days then somebody should do something.

I think Nicool wrote something about this at the start.

If you have a question, why not post it?

If you don't have one you want to ask, please reply to that effect and unless chroot shows up I will think of one

Id rather you did though since its time for some new people

 

[Shadow]

Okay then.

1) What is Helioseismology and what do you do? (This may be little unclear so if you don't get it, then just tell me and I will explain what I mean)

2) What two kinds of radiation are Gamma Rays converted into by the time they emerge from the suns photosphere?

 

[LURCH]

Originally posted by Shadow
Okay then.

1) What is Helioseismology and what do you do? (This may be little unclear so if you don't get it, then just tell me and I will explain what I mean)

2) What two kinds of radiation are Gamma Rays converted into by the time they emerge from the suns photosphere?

Two off-the-cuff geusses;

1) Just judging from the composition of the word itself, I would geuss it's the study of turbulance on the Sun's surface (prob. to determine what's happeneing underneath).

2) Heat and light?

 

[Shadow]

Number 1 is close but not exactly right but I will give it to you...it isn't of the suns surface, but the suns interior.

Number two is wrong

 

[chroot]

1) The study of modes of pressure-wave oscillations in the sun's interior.

2) The gamma-rays emitted by the nuclear reactions at the Sun's core are converted to lower-energy forms of electromagnetic radiation by the non-reacting envelope. There is no 'second' form of radiation attributable to the gamma rays themselves.

- Warren

 

[Labguy]

Wouldn't it be electromagnetic and neutrino? It can't be X-ray, because that is one form of EM. And, neutrinos are produced at the same time as the gamma radiation, but aren't a "product" of the gamma radiation, like Chroot said.

 

[Shadow]

Actually (and I can understand why you don't have these...it was a question with a few possible answers) I was looking for "by the time Gamma Rays emerge ffrom the photosphere, the energy is converted in infrared and optical radiation"

 

[chroot]

Originally posted by Shadow
Actually (and I can understand why you don't have these...it was a question with a few possible answers) I was looking for "by the time Gamma Rays emerge ffrom the photosphere, the energy is converted in infrared and optical radiation"

Well, this is simply not correct, as it's also converted into ultraviolet, X-ray, radio, etc.

- Warren

 

[LURCH]

Originally posted by Shadow
Actually (and I can understand why you don't have these...it was a question with a few possible answers) I was looking for "by the time Gamma Rays emerge ffrom the photosphere, the energy is converted in infrared and optical radiation"

That's what I said; heat and light!

 

[Shadow]

Actually (and I can understand why you don't have these...it was a question with a few possible answers) I was looking for "by the time Gamma Rays emerge ffrom the photosphere, the energy is converted in infrared and optical radiation"

I clearly said right there that it was a question with a few possible answers but I was also looking for two specific answers and lurch got it right i just missed it because I was looking optical and infrared I think my eyes just skipped over heat and light. Your go LURCH

 

[LURCH]

'K,

When/where on Earth will the next total Solar eclipse be?

 

[chroot]

23 November 2003, in *gasp* Antarctica.

http://sunearth.gsfc.nasa.gov/eclipse/TSE2003/TSE2003.html

- Warren

 

[LURCH]

[>:)] (that's bull's eye) Chroot.

Think I might miss that one!

Your go.

 

[marcus]

Lurch posed a question about a solar eclipse, Chroot answered correctly, Lurch replied and said it was Chroot's turn to ask. But over 3 days have gone by and he has not posted. (People go on vacation or get busy at work etc.)

Nicool's rules cover this kind of situation in other explicit cases.

Originally posted by Nicool002
Hi guys! Most of you know how this works but for the newcomers:

The rules are this: someone will ask a question and if the question is not answered correctly within 3 days then a new question will be posted. If an answer to a question is posted and the person that posted the question does not respond to the answer within 2 to 3 days, then the first person to have answered the question will then be able to post their own question. HAVE FUN AND LEARN!

In the spirit, if not the letter, let's extend the rules of order to this case.

Lurch, you asked the last question. Why don't you give Warren one day to take his turn as asker, and if he doesn't then you take another turn and ask the next question?

Shadow, if Lurch is also on vacation, then its up for grabs. You could pose one

 

[LURCH]

That seems equitable. C'mon, Chroot, let's hear from ya!

 

[Labguy]

Originally posted by LURCH
That seems equitable. C'mon, Chroot, let's hear from ya!

He teaches. It is summer time. Teachers do not work in the summer.

 

[marcus]

Originally posted by Labguy
He teaches. It is summer time. Teachers do not work in the summer.

Well SOMEBODY go!

 

[Labguy]

Originally posted by marcus
Well SOMEBODY go!

Ok, I have been away for a long time on "sick-leave". This might have been asked before, but I'm not going to read 20(x) pages to find out.

Question:
When and where (who is a bonus) were the first redshifts measured (taken?) indicating that the Andromeda galaxy was moving with respect to us?

 

[LURCH]

My power's been out the last two days (maybe you heard about it?).

Thanks for covering for me, Labguy.

 

[schwarzchildradius]

Here's my guess:
Humason & Hubble,
Mt. Wilson Palomar observatory
1923
(andromeda is moving towards us)
correct?

 

[Labguy]

Originally posted by schwarzchildradius
Here's my guess:
Humason & Hubble,
Mt. Wilson Palomar observatory
1923
(andromeda is moving towards us)
correct?

No, none were correct except for the fact that Andromeda (galaxy) is moving towards us.

 

[Lonewolf]

Vesto Melvin Slipher in 1912. Not sure where.

 

[Lonewolf]

Lowell Observatory, Flagstaff, Arizona.

 

[Labguy]

Originally posted by Lonewolf
Vesto Melvin Slipher in 1912. Not sure where.

Lowell Observatory, Flagstaff, Arizona.

Where is correct and when is very close, but a tiny bit off...

 

[Lonewolf]

He began the observations in 1909, but didn't make the observation until 1912.

 

[Labguy]

Originally posted by Lonewolf
He began the observations in 1909, but didn't make the observation until 1912.

That is certainly close enough to be CORRECT! Actually, the first redshift measurement results were determined in 1913.

You ask der next question.

 

[chroot]

Sorry guys, for derailing the Astronomy Q&A thread again... my weekends are for playing!

- Warren

 

[Lonewolf]

Hmm, ok then.

What is stellar interferometry used for, and for a bonus point, what does it involve?

 

[schwarzchildradius]

It's used to measure masses and atmospheric content of stars. Interferrometry involves the wave nature of light- start with I believe it was Huygens principle that every wave is the point source of infinitely many subsequent waves. So in a double-slit experiment you can see each slit behaves like a unqiue wave generator, and the waves can interfere with each other (causing alternating bright and dark bands). Not too surprising unless the source is a single photon, in which case the single photon will interfere with itself. But I gladly yield if anyone has a more topical answer.