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Origin of our solar system
Our solar systemwas a mass of stelar dust that started to turn around, and
when it concentrates, it turns into a very hot ball
that is the sun, a star. The
matter that is outside forms
small balls that are our planets.
In our solar system, nine planets circle around our Sun. The Sun is in the middle while the planets travel in
circular paths (called orbits) around it
Inner Planets: Closest to the Sun and made of rock. The are: Mercury, Venus, Earth and Mars.
Mercury is the smallest and nearest planet to the Sun, so it´s very hot.Venus is almost the same size as the Earth. It is the hottest planet.Earth is our planet and is the largest of all the four inner planets.Mars. Scientists believe Mars had rivers and oceans million of years ago.
Outer Planets.They are the farthest away from the Sun planets, made up of gases.They are very
large. Jupiter is the largest planet.
Uranus is surrounded by a small ring.NeptuneThe farthest away and the coldest. planet
Saturn is surrounded by a ring made up of rock and dust.
If we compare the size of the Sun with the sizes of the Planets, we can see that the Sun is much
bigger.
Comets are celestial bodies made of rock and ice that move around the space and the tail means
that the ice is melting while they travel.
Galaxy and Milky Way. A galaxy is made up of million of stars. One of them is the Sun and many
others have their own system.
The Earth is the planet where we live. Most of The surface is covered by water this is why is called: “
the Blue Planet”The land is made up with continents and islands.
The water can be found in the seas, Oceans, rivers, lakes, ponds…
The Earth is surrounded by a layer of air called the Atmosphere.This is where the clouds are found.
THE MOONThe Moon is a satellite of the
Earth. The Moon is much smaller than the Earth.There are many
holes on its surface called craters. It does
not give off light. It looks bright
because it reflets light from the Sun.
DAY AND NIGHT
The Earth rotation causes the changes from day to night. The sun does not move. The Earth moves around the Sun and on its axis. This is called rotation and it takes 24 hours, one day.
The Earth Rotation. The Earth orbits the Sun.
To see the Earth rotation: www.youtube.com/watch?v=8Vmmv0gOfWw
One complete
orbit takes 365 days.
This is called an Earth
revolution or a year. Earth
revolution causes the
four seasons.
The Sun is a star. Stars are like giant balls of fire. Life on Earth is possible thanks to the light
and heat from the Sun
The Moon orbits the Earth. It takes 28 days. This is called “lunar
month”
New Moon
Full Moon Crescent
Moon Last quarter
First quarter
CrescentMoon
New Moon