Group X The Seasons

Have you wondered how there are different seasons every three months?

Many people believe that Earth is closer to the sun in the summer and that is why it is hotter. And they also think that Earth is farthest from the sun in the winter. Although it sounds reasonable and make perfect sense, it is incorrect!
It is true that Earth's orbit is not a complete circle. eb16029f5adf96290809b641a0503297.jpg
Its a bit lopsided a tiny bit like a rubber band, slightly stretched.
There is a different reason.

Earth has seasons because its axis doesn't stand up straight. Long, long ago, when Earth was young, it is thought that something big hit Earth and knocked it off-kilter. So instead of rotating with its axis straight up and down, it leans over a bit.

By the way, that big thing that hit Earth is called 'Theia'. It also blasted a big hole in the surface. That big hit sent a huge amount of dust and rubble into orbit. Most scientists think that that rubble, in time, became our Moon.

As Earth orbits the sun, its tilted axis always points in the same direction. So, throughout the year, different parts of Earth get the sun’s direct rays.

seasons.png

Sometimes it is the North Pole tilting toward the sun (around June) and sometimes it is the South Pole tilting toward the sun (around December).It is summer in June in the Northern Hemisphere because the sun's rays hit that part of Earth more directly than at any other time of the year. It is winter in December in the Northern Hemisphere, because that is when it is the South Pole's turn to be tilted toward the sun.

four-seasons.jpg
Unless otherwise stated, the content of this page is licensed under Creative Commons Attribution-ShareAlike 3.0 License