SUPER SCIENCE.

Say goodbye to summer, guys! Winter's on its way--after the fall, of course. But that doesn't mean it'll be winter everywhere on earth!

The equator is an imaginary circle around the middle of our planet, as if cutting it in two.

We call the top half of the earth the northern half, or hemisphere. The lower half is the Southern Hemisphere.

The earth is tilted as it goes around the sun each year. So when one hemisphere is closer, it's hotter there--because the sun's rays strike it more straight on. Sunlight hits the more distant hemisphere less directly.

Not all countries have four seasons. In some places there are only two--hot and dry. Hey, that's how I feel! Time to cool down!

Winter or summer, it's always cold at the North and South poles. There, the sun's rays always arrive at too shallow an angle to provide much warmth.

Winter in the Northern Hemisphere means it's summer way down under in Australia. This year, they're holding the Summer Olympics here in Sydney in late September, so the weather will be warm in both the Northern and Southern Hemispheres.

Maybe they'll let me take part! Meantime, why not ask an adult to help you take air temperature readings with a thermometer. Then you'll see how much hotter or colder each season is!