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All Those Question Memes

weather: foggy
outside: 8°C
mood: dorky
Because I can't keep up with all the memes, I'll boil it down to:

  1. Tell me something about yourself that I didn't know.

  2. Tell me something you've discovered about me.

  3. Tell me something else. Anything at all, but if you need a writing prompt, I have Astronomy on my mind today.

    1. Easy:

      Look up at the pretty sparklies in the sky. How does it make you feel?

    2. A little more challenging:

      Our neighbor galaxy, Andromeda, has a luminosity (intrinsic brightness) 3 times as bright as the Luminosity of our Milky Way galaxy, LAndromeda = 3LMW, and is at a distance of dAndromeda = 0.7 Mpc. The flux we observe from the Andromeda galaxy (apparent brightness) is 10,000 times brighter than the flux observed from a distant quasar, fAndromeda = 104fquasar. This quasar has a luminosity that is 1000 times the luminosity of our Milky Way galaxy, Lquasar = 103LMW.

      What is the distance d to the quasar? Show your work.


      fAndromeda/fquasar = ( LAndromeda/Lquasar ) ( Andromeda/quasar )

      quasar/Andromeda = ( fAndromeda/fquasar ) ( Lquasar/LAndromeda )

      dquasar/dAndromeda = ( fAndromeda/fquasar ) ( Lquasar/LAndromeda )

      dquasar/dAndromeda = (104) ( 103LMW/3LMW )

      dquasar = 107/3 x 0.7 Mpc

      = 1826 x 0.7 Mpc = 1.28 x 10³ Mpc


      Explain how antennas and electromagnetic wave propagation work using the concepts of divergence and curl with mention of their practical applications in Astronomy.


( 13 comments — Leave a comment )
Nov. 23rd, 2004 04:21 am (UTC)
1) Astronomy is a hobby of mine, but I can't do math. So instead, My degrees are in History, and I had minors in Anthropology/Archaeology. :) Betcha didn't know THAT about me.

2)You are WAAAAAAYYYY Smarter than me. :)

3) A. It makes me feel awed. It really is beautiful. I want to be there.
B. You want me to do MATH? BWA-hahahahahahahaha! However, as Quasars are the most distant objects currently capable of being seen by astronomers, the distance is likely to be several hundred million light years. The problem that I see with this question though is that it fails to take into account Drift. The luminosities you are comparing ONLY takes into account the position of the Quasar at the time it emitted the luminescence. Do you want the ACTUAL distance to the quasar, or the distance to where the quasar was at that time? Because there would then need to find out the relative speed of the expansion of the universe, and make a best guess estimate at where it is now...

3) I find radio astronomy terribly dull outside of its applications for SETI research. I'm more interested in using photographic techniques and imaging to detect the eclipses and occultations caused by extra-solar planetary bodies on their stars...

Nov. 23rd, 2004 05:47 pm (UTC)
My degrees are in History, and I had minors in Anthropology/Archaeology.

Huh. Interesting =)

Re: Drift

Fair enough. =) I've wondered how negligible the effects of drift actually are though.
Nov. 23rd, 2004 07:06 am (UTC)
1. I have smoked exactly one cigarette in my life.

2. I think your husband is a Real Hacker.

3. Pass :p
Nov. 23rd, 2004 05:51 pm (UTC)
I have smoked exactly one cigarette in my life.

Exactly one. As opposed to approximately one? =)
Nov. 23rd, 2004 09:12 pm (UTC)
Nov. 23rd, 2004 09:37 am (UTC)
ew. I don't want to be thinking about div and curl. I've had enough of the right hand rule, thank you very much. The only reason I want to be sticking my thumb out is to hitch a ride.

omigod i understood both those last questions and could answer them if I felt like it
Nov. 23rd, 2004 09:44 am (UTC)
i understood both those last questions and could answer them if I felt like it

Neeeerd... =D
Nov. 23rd, 2004 09:50 am (UTC)
hey, at least I didn't answer them!
Nov. 23rd, 2004 05:33 pm (UTC)
Is the quasar 20.25 Mpc away?
Nov. 23rd, 2004 05:43 pm (UTC)
Nope. 1.28 x 103 Mpc.

Use f = L/d2 for the two relations (one for Andromeda, one for the quasar), then divide one by the other.

Nov. 23rd, 2004 06:22 pm (UTC)
Ah. I used the magnitude-distance-luminosity equation at luminosity on Wikipedia.

Makes sense now given the units. Doh.
Nov. 24th, 2004 08:23 pm (UTC)
1. I talk better than I can program better than I can dance...

2. You can be uber-geeky ... even out geeking me... =P But you still uber-love your husband more than anything else.... except some of that eternal love stuff...lol

3. I find trust is delicate and not easy....

A) You can't see stars in the city. Go out into the countryside (1+ hour drive/road trip), to see some real glitter and shine. But I do find that the stars always seem to *recharge* and *look after* me...

B) The answer depends on which theory of the expanding/collapsing universe you believe in. If the universe expands indefinitely, infinitely, the answer is infinity ... which if the universe shrinks and collapses to absolutly nothing .. the answer would be zero, but that would be a quantitative answer to nothing .. .so the right answer is infinity... ;o) Hey .. distance is a relative measurement... Besides .. I don't feel like digging out my old physics text....

C) I was in my mother's womb ...... I'm just kidding .. you're not thta old ... you're .. umm .. not old at all .. just older than me...

I was on LJ and I did come across your LJ quite a few times .. but never really did drop by until later on ....

Nov. 25th, 2004 10:01 am (UTC)
1.) All things considered, I would not change anything in my past. It's not that I have not had those supper embarrassing moments in life, I just think that I learned a lot from them.

2.) I am going to second scott_wells and say that you are extremely smarter than me. But I have found that it is always better to know people smarter than you. That way I am constantly working to learn and grow. It is wonderful motivation. :)

3.) Um... Astronomy. Nope. I will pick something else... How about I am so thankful that I my baby boy stayed in me for 34 weeks. It is such a blessing considering all the people who have had their babies much earlier. (It's Thanksgiving today I was trying to think of what I am going to say when we go around the table.)
( 13 comments — Leave a comment )


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