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 Post subject: IMBERBE#13: ASTRONOMY QUIZ (RV)
Unread postPosted: Tue Feb 05, 2008 1:07 am 
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Lets try a totally new area.

THE RULES:

Keep it astronomy (No astrology please! :evil:)

Keep it simple! Give good clues!

This is a revolving quiz (RV). When you answer correctly and have been appointed as the next person to pose a question, you have three days to pose the question.

I will keep watch, but only interfere when necessary to keep things flowing and on track.

Lets all learn some new things!


QUESTION 1

Name the closest visible "star" to the sun, and what is interesting about that "star"?

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 Post subject:
Unread postPosted: Tue Feb 05, 2008 7:19 am 
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Ok, I'm no fundi but here goes:

Alpha Centauris? This is both the morning and the evening star?

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Unread postPosted: Tue Feb 05, 2008 7:55 am 
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The morning and evening star is not a star but a planet. Planet Venus.

Proxima Centauri is the nearest known star to the sun, at a distance of about 4.2 light years. It is an intrinsically faint red star, more than ten magnitudes (ten thousand times) fainter than the Sun. It is also much cooler, with a surface temperature of about 3100 C. Its visual (apparent) magnitude is eleven, so it is only visible with a good telescope, and only then from southern latitudes. Proxima is about one-tenth the mass of the sun, which accounts for its low surface temperature. It is possibly an outlying member of the triple Alpha Centauri system just a few light days closer to us than the other, much brighter stars in the group.

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 Post subject:
Unread postPosted: Tue Feb 05, 2008 10:07 am 
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:clap:

In fact - both of you are correct! :huh:

Let me explain ...

Firstly: No, Alpha Centauri is not the morning or evening star, it is in fact (mostly) Venus as cybeR@nger explained.

Secondly: I should have explained "visible" a little better. I meant here with the naked eye. But it is exactly that that makes both of you correct!

When looking at the night sky you will see Alpha Centauri, the brightest star in the pointer of the Southern Cross. But in fact Alpha Centauri is not one star, but consists of a system of three stars that orbit each other. Alpha Centauri A and B is but 4 light hours from each other and orbits each other in 80 years. Alpha Centauri C (also called Proxima Centauri) is aprox. 2 light months from Alpha Centauri B and apparently orbits both of its neighbours. Currently Proxima Centauri is our suns nearest star neighbour.

A nice explanation cybeR@nger!

Next question to christo :wink:

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 Post subject:
Unread postPosted: Tue Feb 05, 2008 11:40 am 
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Your question turned out to be pretty tricky, because, while the triple star system Alpha Centauri is seen as a single star to the naked eye, Proxima Centauri is in fact closer to us than the other two.

Because it is the nearest star to the Sun, it is named Proxima (from the Latin word for "nearest") Centauri.

So much for "Keep it simple!" :twisted:

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 Post subject:
Unread postPosted: Tue Feb 05, 2008 11:52 am 
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:lol: :redface:

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 Post subject:
Unread postPosted: Tue Feb 05, 2008 3:30 pm 
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Interesting quizz imberbe :)
Afraid i wont be much good at it, but looking forward to learning anyway :)

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 Post subject:
Unread postPosted: Tue Feb 05, 2008 7:15 pm 
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Great quiz and would love to learn more, think I got lost after the 'keep it simple bit' but I will try to keep up :D
I just love the Kruger sky!


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Unread postPosted: Tue Feb 05, 2008 7:34 pm 
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It is a great quiz, Freda, and one of my favourite topics. 8)

Can't wait for the next question (*rubbing hands*) :lol:

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 Post subject:
Unread postPosted: Tue Feb 05, 2008 7:45 pm 
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Isn't it a revolving quiz :? then it's your call cybeR@NGER, perhaps you can tell us about beetle juice :wink:


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 Post subject:
Unread postPosted: Tue Feb 05, 2008 9:31 pm 
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Freda it sounds as if we are going to have lots of interesting questions from cybeR@nger ... but it is Christo's turn now. :naughty:

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 Post subject:
Unread postPosted: Wed Feb 06, 2008 10:41 am 
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Oops, I've been out. Will page through a couple of things and come up with something. Will have to google, I know zip about astronomy, :redface:

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Last edited by christo on Wed Feb 06, 2008 10:59 am, edited 1 time in total.

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Unread postPosted: Wed Feb 06, 2008 10:57 am 
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Ok here goes:

We have 12 "Planets" or bodies in our solar system, with more to come. They are classified as:
1) Eight classical planets,
2) Three "plutons"
3) and Ceres.

What are the differences between1, 2 & 3?

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 Post subject:
Unread postPosted: Wed Feb 06, 2008 10:45 pm 
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:big_eyes: This was really an easy one!!! :tongue:

OK, this is what I came up with ...

A PLANET:
1. A celestial body that orbits a star, which is not in itself a star or a satellite of another planet.
2. Is massive enough to have nearly a round shape because of its own gravity.
3. Has cleared the neighbourhood around its orbit of other bodies.

THE EIGHT CLASSICAL PLANETS IN OUR SOLAR SYSTEM:

1. Mercury
2. Venus
3. Earth
4. Mars
5. Jupiter
6. Saturn
8. Neptune

THE THREE PLUTONS

1. These are small dwarf planets that orbits the sun once in more than 200 years. (They are thus beyond Neptune in the Kuiper belt.)
2. Their orbits tend to be more tilted than the classical planets and the orbits are not as round as those of the classical planets.
3. They are Pluto, Charon and 2003 UB313. (Though the names still seems to be a point of discussion.)

CERES

1. It is the smallest of the dwarf planets and is a lot smaller than our moon.
2. It is situated in the Asteroid belt between Mars and Jupiter.
3. It contains approx. a third of the mass of all the objects in the asteroid belt.
4. It has not cleared its neighbourhood of other bodies and is thus not considered as a planet.

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 Post subject:
Unread postPosted: Thu Feb 07, 2008 3:36 am 
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It is easy, but I thought "the very beginning" is a good place to start if dummies like me need to learn :wink:

The sun would have been a good starting point, but it is a little obvious, so thought I'll tackle the planets. :twisted:

This was maybe a little too easy, therefor the overwhelming response? Over to you Imberbe.

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