Our Planet Earth and The Solar System. Stars The Sun is the biggest and closest star to Earth. The Sun is very important because it gives us light and.

Our Planet Earth

and The Solar System

StarsThe Sun is the biggest and closest star to Earth. The Sun is very important because it gives us light and heat.

A group of stars is called

a Galaxy. Our galaxy is

called the Milky Way.

PlanetsAll planets orbit a star because they need light. They spin around an axis and orbit around a star.

The planet we live

on is called Earth. It

spins on its axis in 24

hours and orbits our

star the Sun in 1 year.

Satellites orbit a planet. Our satellite is called the Moon.

Comets are made of

ice and rocks.

Asteroids are giant rocks.When they fall to Earth theyare called meteorites.

The Solar SystemHow many planets orbit the sun?

Mercury

Venus

Earth

Mars

Jupiter

Saturn

Uranus

Neptune

The Sun

http://www.youtube.com/watch?v=wjQJMeq7_Pk&feature=related

Hot and ColdWhich are the hottest/inner planets?

- Mercury, Venus, Earth and Mars

Why?

- Because they are close to the Sun.

Which are the coldest/outer planets?

- Jupiter, Saturn, Uranus and Neptune

Why?

- Because they are far away from the Sun.

Earth’s OrbitLike all planets, Earth orbits the

Sun.It takes 1 year to orbit the Sun.

1 year = 365 daysThis movement causes the FOUR SEASONS

What are the four seasons?

Spring, Summer, Autumn and Winter.

How long does it take for Earth to orbit the Sun? It takes one year. One year is 365 days.

The Four Seasons

Earth’s SpinningWe know the Earth orbits the Sun once a year.

But, the Earth also spins on its own invisible axis.

The Earth takes one day to spin around.1 day = 24 hours

When the Earth spins, half is in the Sun’s light (day) and half is in the Sun’s dark shadow

(night).

How long does it take for Earth to spin on its axis?

It takes one day. One day is 24 hours.

Day and Night

Day

Night

http://www.youtube.com/watch?v=taHTA7S_JGk&feature=related