MERCURY

Mercury: is the smallest and nearest planet to the Sun of the eight planets in the Solar System, with an orbital period of 88 Earth days.

URANUS.

Uranus is the seventh planet from the Sun. It has the third-largest planetary radius and fourth-largest planetary mass in the Solar System. It is similar in composition to Neptune.

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HOW DOES A STAR FORM?

There are several steps in the formation of a star:
First a cloud of gas and dust comes together, due to gravity, to form a "protostar" (a hot blob that is not quite a star but will eventually become a star) that takes thousands of years.
Then the center of the blob becomes hot enough to give off visible light and most of the cloud of gas and dust has fallen into it. So now it looks like a star. That takes about a million years.
Then the rest of the cloud of gas and dust either falls into the star or gets blown away, and the star gets hotter and smaller due to gravity. Finally the center becomes so hot that the hydrogen gas starts to undergo nuclear reactions to become helium, which provides the energy for the star to keep shining for billions of years. It takes about 20 million years for the new star to get to this point.

USEFUL VOCABULARY:
- Blob: masa amorfa.
-Dust: polvo.

BIRTH OF THE SOLAR SYSTEM

In this video the birth of the Solar System and our Sun is explained.

THE SOLAR SYSTEM.

The Solar System comprises the Sun and eight planets, as well as satellites and other objects that orbit the Sun. The vast majority of the system's mass is in the Sun. 
http://www.youtube.com/watch?v=z_RAEESmsrs
http://www.youtube.com/watch?v=BT49AiYFV98

SATURN

Saturn: the 6º planet of the Solar System

THE MOON

The moon is the only natural satellite that the Earth has and it is the largest in the Solar System, with a radius of 1,737.10 km. It is the brightest object in the sky after the Sun.
It was formed 4.5 billion years ago when the Earth impacted with a body that was the size of Mars.
Its rotation is syncronized with the Earth's and it's always showing the same face.
Its surface is covered with multiple craters.
The Moon has a regular cycle of phases and it has an influence on the Earth that produces the ocean tides and the length of the days.
It is the only body in space that humans have set foot on. The first man who landed on the Moon was Neil Amstrong on 21st July 1969 with the Apollo 11 spaceflight and it was a historical event that was broadcasted on TV worldwide.

OUR PLANET

The Earth is form by tectonic plates and different stratums. Let´s learn more about them!

LEARNING ABOUT PLUTO

Pluto was considered a planet of the Solar System until recently. In this video you will learn the reasons why.

THE SUN

The Sun is the star at the center of the Solar System. It is almost perfectly spherical and consists of hot plasma and magnetic fields, it has got poles.
Its diameter is 109 times bigger than the diameter of the Earth.
Three quarters of the Sun's mass consists of hydrogen, while the rest is mostly helium and other elements.
The Sun formed about 4.6 billion years ago. The central mass became increasingly hot and dense, which iniciated a fusion in its core.
It is designated as a yellow dwarf  as it appears yellow from the Earth..It's a spectral star.
The distance of the Sun from the Earth is around 150,000,000 km.

In this picture you can see the layers of the Sun:

PLANETS

-Mercury: first planet, it hasn't got atmosphere, 179ºC, it hasn't got any satellites
-Venus: second planet, 280ºC, traslation of 7 days
-Earth; third planet from the Sun, it's got atmosphere, it takes 24 hours to do the rotation movement and 365 days to do the traslation movement
-Mars: fourth planet from the Sun, called "the red planet", very thin atmosphere, two satellites: Fobos & Deimos
-Jupiter: fifth planet, first gaseous, composed by hydrogen & helium, sixteen satellites, red spot
-Saturn: sixth planet, gaseous planet, the only one with a visible rings system, atmosphere formed by hydrogen, helium and metanum
-Uranus: seventh planet from the Sun, it has got atmosphere and a minimun temperature of -224.2ºC
-Neptune: eighth and farthest planet from the Sun, it is the most dense and it's 17 times the mass of the Earth

WELCOME!

Hello and welcome to our blog. Here, we´re going to talk about contemporary world science. We´ll be posting interesting and useful information about the subject. We hope you like it :)