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 Post subject: Re: IMBERBE#13: ASTRONOMY QUIZ (RV)
Unread postPosted: Wed Jun 16, 2010 8:34 pm 
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:hmz: Because we can't see the ones on the other side, so can't count them? :twisted:

I don't know, so I'll leave the answer to the fundis, lest I guess right and have to come up with an answer! :tongue:

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 Post subject: Re: IMBERBE#13: ASTRONOMY QUIZ (RV)
Unread postPosted: Sun Jun 20, 2010 4:10 am 
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TP, great Q! :clap:

The far side of the Moon only has 2.5% of its surface covered by maria, compared to 31.2% on the near side. The easy answer is that scientists are not really sure why this is! However, recent evidence suggests that this difference is related to a higher concentration of heat-producing elements on the near side of the Moon; these elements logically are related to lava flows, which the maria were caused by.

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 Post subject: Re: IMBERBE#13: ASTRONOMY QUIZ (RV)
Unread postPosted: Tue Jun 22, 2010 1:04 am 
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:clap: :clap: OWN!

Does'nt look like anyone else is going to have a go :cry:

You are quite correct in your statement that no one really knows why this is the case. Coupled with your observation regarding the heat producing elements, there is also the theory that the tidal pull of Earth thins the crust on the near side which allows the lava to flow easier therefore creating more maria.

OWN, you would be IT <please> :wink:

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 Post subject: Re: IMBERBE#13: ASTRONOMY QUIZ (RV)
Unread postPosted: Fri Jun 25, 2010 6:28 am 
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Thanks TP. :thumbs_up:

How dense is the densest black hole discovered to-date?

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 Post subject: Re: IMBERBE#13: ASTRONOMY QUIZ (RV)
Unread postPosted: Sun Jun 27, 2010 11:14 am 
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Too difficult? I can change the Q if you mites prefer?

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 Post subject: Re: IMBERBE#13: ASTRONOMY QUIZ (RV)
Unread postPosted: Sun Jun 27, 2010 1:20 pm 
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:hmz: What unit is used to measure black hole density? Maybe kg/m³


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 Post subject: Re: IMBERBE#13: ASTRONOMY QUIZ (RV)
Unread postPosted: Sun Jun 27, 2010 4:55 pm 
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It doesn't matter, as long as it is a unit of density. :thumbs_up:

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 Post subject: Re: IMBERBE#13: ASTRONOMY QUIZ (RV)
Unread postPosted: Mon Jun 28, 2010 1:22 am 
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The Q is'nt too difficult OWN, but I refrain from playing on the grounds it might possible incriminate me and I just don't have the time at the moment :wink:

It's a superb Q and the answers are very interesting :lol:

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 Post subject: Re: IMBERBE#13: ASTRONOMY QUIZ (RV)
Unread postPosted: Mon Jun 28, 2010 1:19 pm 
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OWN, I don't wanna play now as I'm basically only online today and tomorrow, and maybe a bit on Wednesday. Will play again next week onwards. :thumbs_up:

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 Post subject: Re: IMBERBE#13: ASTRONOMY QUIZ (RV)
Unread postPosted: Mon Jun 28, 2010 1:25 pm 
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The NASA site would probably be a good start - www.nasa.gov

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 Post subject: Re: IMBERBE#13: ASTRONOMY QUIZ (RV)
Unread postPosted: Tue Jun 29, 2010 3:40 am 
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Timepilot wrote:
The Q is'nt too difficult OWN, but I refrain from playing on the grounds it might possible incriminate me and I just don't have the time at the moment :wink:

It's a superb Q and the answers are very interesting :lol:


:thumbs_up: Thanks TP.

But, incriminate you?? Can't believe that! Nope. :wink:

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 Post subject: Re: IMBERBE#13: ASTRONOMY QUIZ (RV)
Unread postPosted: Mon Jul 05, 2010 11:56 pm 
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:hmz: About half the density of one politician? :whistle:

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 Post subject: Re: IMBERBE#13: ASTRONOMY QUIZ (RV)
Unread postPosted: Tue Jul 06, 2010 1:11 pm 
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:hmz: Are you speaking "density" or "mass" here OWN? Typically, density would be described in terms of grams per cubic meter. For example, if the mass in the Sun were to collapse into a Black Hole, this would yield a density of about 10^22 grams per cubic meter, while larger stars would produce densities several orders of magnitude greater.

I don't see anything on BH densities. But I see a lot on BH size. And that is measured in terms of the size of the BH in relation to the sun's mass. Thus big ones are a million suns or such. Now it seems the biggest BH discovere is a whopping 18 billion suns, and is about the size of an entire galaxy! But I can't find a name for it, only that it forms the center of the quasar OJ287.

(If you really want to get cross-eyed with maths you need to take a look at this page!! :big_eyes: Black hole universe)

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 Post subject: Re: IMBERBE#13: ASTRONOMY QUIZ (RV)
Unread postPosted: Tue Jul 06, 2010 11:56 pm 
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Imberbe wrote:
:hmz: About half the density of one politician? :whistle:


:lol: :lol:

But I've never known you to be so cynical, IB! :wink:

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 Post subject: Re: IMBERBE#13: ASTRONOMY QUIZ (RV)
Unread postPosted: Wed Jul 07, 2010 12:08 am 
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Bishop, the defining interest point of a BH is its density because it is this characteristic that allows the gravitational pull to be so intense that light is not allowed to escape - hence a BLACK hole! How many masses of the Sun are contained in a tiny space is used as a guage simply because a black hole is small anyway. You're on the right track, but I am looking for a density measure, or maybe say "one teaspoon of this BH weighs so-many tonnes".

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