Seasons on Earth

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Earth's revolution around the Sun creates the seasons. They are different in the Northern and Southern Hemispheres.

Why do we have Seasons on Earth

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Earth completes a revolution around the Sun over 365.25 days. It is this orbit, combined with the tilt on Earth's axis, which causes the seasons. The tilt, which is approximately 23.5 degrees, means that the Earth leans slightly

towards the Sun.

For part of the year, the Northern Hemisphere is tilted towards the Sun. During this time, the Sun is closer to the Northern Hemisphere. This means the Northern Hemisphere is in the direct path of the Sun's energy.

As the Sun's rays hit Earth, they are concentrated, because they've travelled less distance through the atmosphere. The Sun rises higher in the sky and produces longer days. This is the Northern Hemisphere's summer.

At the same time, the Southern Hemisphere is tilted away from the Sun. The Sun's rays hit Earth at an angle. The Sun's energy is weaker as it has travelled through more of the atmosphere. The Sun doesn't rise as high in the sky and the days are shorter. This is winter in the Southern Hemisphere.

AMAZING FACTS about Our Solar System : Seasons on Earth

Astronomers look in space for asteroids or meteorites that might be headed towards Earth.

Today, in the United States and Australia, we can still see craters that are the result of meteorites hitting Earth.

Huge asteroids like the one that caused the extinction of the dinosaurs collide with Earth about once every 100 million yeors. That asteroid was 15 km wide.

When small fragments of cosmic debris, often left over from a passing comet, enter Earth's atmosphere at high speed we get a meteor shower.

In some regions of the planet, like India, people refer to wet and dry seasons instead of the four seasons.

When it is summer in the Southern Hemisphere, it is winter in the Northern Hemisphere and vice versa.

When it is spring and autumn, neither hemisphere is tilted toward the Sun. - Seasons on Earth.