# Blog

## Hot stars and heavy air – a quick quiz

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Ready to test your knowledge? In this quiz we’ve got a range of questions, about distant stars to the very air we breathe!

## Results

Congratulations! You’re a real science whiz!

Oh dear! Better brush up before the next quiz!

### #1. What colour are the hottest stars?

The hottest stars are blue supergiants, which can have surface temperatures around 30 000 degrees Celsius. Our Sun is a yellow star that has a surface temperature around 5500 degrees Celsius.

### #2. If you filled an Olympic swimming pool with air, roughly how much would the air weigh?

One cubic metre of air weighs about 1.3 kilograms, and there are 2500 cubic metres in an Olympic swimming pool, which is why a pool full of air can weigh as much as two small cars!

### #3. If you put a 20 cent coin flat on a table, how many 20 cent coins can you place flat on the table around the edge of the original coin?

Circles of the same size fit together tightest in a hexagonal pattern, with six circles around each circle.

### #4. Where is the Australian Square Kilometre Array Pathfinder (ASKAP) radio telescope located?

The ASKAP radio telescope is a collection of 36 identical dishes situated in a radio quiet zone in Western Australia.

### #5. What does a deciduous tree do?

Deciduous trees lose their leaves once a year. In temperate climates, they usually lose their leaves in autumn. In the tropics, deciduous plants typically lose their leaves in the dry season.

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