The brightness of a star can change with time. When observing from earth, the flickering of stars is due to minor turbulence in the earth's atmosphere. But when measured more accurately, many stars show a degree of variability in their brightness. There are many different types of variable stars.
The two main types of variable stars are,
1. Intrinsic variable stars
2. Extrinsic variable stars.
Intrinsic variable stars change their brightness due to changes in the properties of that star, while the mechanism of an extrinsic variable star involves an object outside the star.
If you are confident about your knowledge in variable stars, try this Variable star Quiz.
July 30, 2010
July 21, 2010
Organizing a Quiz 4: Participants
So you have organized a quiz, and ready to have the participants. Like in any other quiz, it's important to invite them early, with time to get ready. This will help the quiz, since prepared teams will make an interesting competition. It will also improve the number of teams turning up for the event.
Send a letter with clear instructions detailing the format, time, venue of the quiz and any special details which you might think helpful. Include contact details in case they need further clarifications.
It is important to help them quiz teams perform their best in the quiz. Do guide them on the day of the quiz and assign few persons to attend to the quiz teams.
Send a letter with clear instructions detailing the format, time, venue of the quiz and any special details which you might think helpful. Include contact details in case they need further clarifications.
It is important to help them quiz teams perform their best in the quiz. Do guide them on the day of the quiz and assign few persons to attend to the quiz teams.
July 16, 2010
Scale of the planets
This is an animation done to help understand the scale of the solar system. We often have misguided ideas about the true sizes of the planets. People often tend to think that they are more or less the same size. Hope the animation is educational.
July 15, 2010
Binocular Basics
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July 13, 2010
Organizing a Quiz 3: Making questions
Questions are without a doubt the most important component in a quiz. They can mean the difference between a good and a bad quiz. Good questions doesn't always have to be difficult questions. But they are too easy, then everyone will get them right, creating problems to the organizers.
How do you make good questions? Unfortunately there are no proven way. Since the audience, competitors and the levels of quizzes varies remarkably, it is difficult to give a standard method suitable for all types of quizzes. Let us check the different types of questions first,
How do you make good questions? Unfortunately there are no proven way. Since the audience, competitors and the levels of quizzes varies remarkably, it is difficult to give a standard method suitable for all types of quizzes. Let us check the different types of questions first,
Mercury Quiz
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Take the quiz now! Mercury Quiz
Vote for your favourite planet
We all have our favourites. So which planet is closest to your heart in our solar system? Is it the mighty Jupiter which is larger than all other planets put together. Or is it Mars, the red planet with so much mystery. Saturn with it's graceful rings maybe your choice. Or you might prefer your own world, the planet earth.
Milky Way Quiz
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Take the quiz
July 11, 2010
Orbital motions of the inner planets
This is an animation i created in flash to show the orbital motions of the inner planets. The orbital speeds are according to proportion. The diameters have been exaggerated to improve clarity. Hope you enjoy it. More animations can be found, with sinhala text at my youtube. www.youtube.com/user/astronomyquiz
July 10, 2010
Organizing a Quiz 2: Deciding on the Format
There are several types of quizzes. The table quiz seems to be the most popular among schools. Each one of the formats have their advantages and drawbacks.
Table Quizzes comprise of many teams sitting together with each team occupying 'a table'. They will answer a common set of questions. Since all will answer the same questions, there is no disparity between easy and difficult questions. Everyone will get an equal opportunity. It is easy on the organizers of the quiz, since less
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Organizing a Quiz 1: Finding a Name
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When I was involved in designing the astronomy quiz in Anandian Astronomical Association, we wanted to differ from others. There were quite a few astronomy quizzes but we got permission to get the Sir Arthur C Clarke's name, simply because we thought differently. Many would have thought it might get rejected, but no one has tried.
July 9, 2010
Space exploration: getting the facts right
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If you think you have mastered enough about space missions, then try this,
Space Exploration Quiz
Questions on the solar system
Solar system and planets will be featured in any astronomy quiz competition. So it is important to know them well. You will appreciate that if you know something about the formation and evolution of the individual planets, then most questions are easy. Questions on names, like the surface features, can only be memorized. Also try to find out who comes top in the lists. For instance the largest volcano, hottest planet, brightest planet etc.
Follow these links of you want to practice planet quizzes
Follow these links of you want to practice planet quizzes
'Show and tell' type of questions
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