Astronomy C

[smarticle13]

is astronomy for division C like solar system for division B, except harder?

[rfscoach]

No. Closer to Reach for the Stars only more focused on a topic - currently galaxies, previously variable stars- and much more math. Physics based Astronomy rather than Observational Astronomy.

[wyu1229]

Can anyone explain to me how to locate lyman, balmer and paschen absorption lines on a chart of stellar spectra and how you determine the strongest to weakest line? Essentially, its quesiton number 64 on 2002 Delaware Nationals; here's the link to the tests:
http://www.tufts.edu/as/wright_center/p ... astro.html
and can anyone explain to me what average rate of expansion is? and is there a formula for it? Thanks

[wyu1229]

Also, can someone post an exam that tests on all the 2010 DSO's? My team needs some practice problems on DSO's I have a lot of previous exams, but the DSO's change every year, I believe

[smarticle13]

can someone give me some good sites for the absorption and emission spectrum?

[TheBalticSea]

I did astronomy at the western long island regionals and now my team is going to NY states, so i was just wondering how the two tests are different. Is the states test much harder? More physics? Is there a stellarium involved? (<-- i thought i heard someone mention something about that)
Thanks!

[gogofofo]

Can anyone explain to me how to locate lyman, balmer and paschen absorption lines on a chart of stellar spectra and how you determine the strongest to weakest line? Essentially, its quesiton number 64 on 2002 Delaware Nationals; here's the link to the tests:
http://www.tufts.edu/as/wright_center/p ... astro.html
and can anyone explain to me what average rate of expansion is? and is there a formula for it? Thanks

The average rate of expansion is given by Hubble's constant and is usually given in km/sec/Mpc. It is calculated, then, by dividing the recessional velocity of an object by its distance from us.

[TheBalticSea]

Can anyone explain to me how to locate lyman, balmer and paschen absorption lines on a chart of stellar spectra and how you determine the strongest to weakest line? Essentially, its quesiton number 64 on 2002 Delaware Nationals; here's the link to the tests:
http://www.tufts.edu/as/wright_center/p ... astro.html
and can anyone explain to me what average rate of expansion is? and is there a formula for it? Thanks

the formula is v= (Ho)(d)
^ that's supposed to be H sub o, or H naught (sorry! don't know how to use LaTeX)
H naught is roughly 71 km/sec/Mpc
This holds true for all galaxies that are redshifted.. which is pretty much all of them except the two nearest, M33 and M31.

[TheBalticSea]

Hello everyone !

I'm planning on doing the Astronomy event. I took it this year at Regionals and I did not do well =( There was a lot of conceptual stuff I didn't know. The calculations weren't too bad.

I want to do a lot better next year. What books and sites did you guys use to study astronomy? Any good links =]? Also, how did you guys study the deep sky objects? I have trouble identifying them based on images (I'm a total newbie lol). So any tips on how to get started ?

Space.com is a really good resource for general info. Also, I see you live in NY, so if you live within 70 miles (at least I think it's 70...) you might want to consider Columbia's science honors program, which is held on saturday mornings. They offer a lot of great science classes, many of them in astronomy and physics. Plus, it's free
and Brian Greene came to speak today!! that was pretty cool

[Oglop_Master]

Hey... This seems like an odd question, but if you have a laptop that you bring in, is it legal to save websites that you can open without being connected to the Internet to use? So while I may be using my Internet browser to view the page, I won't be connected to the Internet.