Interior Planets

The are four interior planets: Mercury, Venus, Earth and Mars. They are smaller then the exterior planets,they don't have any satellites, except Earth that has one and Mars has two.

The interior planets don't have any rings and they are made of rock.

Mars Video

Mars

It is the last interior planet. It has two satelites, Phobos and Deimos.
Its atmosphere is made of carbon dioxide and nitrogine.

The temperature in Mars is about -87ºC during the polar winter to highs of up to -5ºC in the summer.


We take 1 year to orbit the Sun, Mars takes 2 years, doble.

Venus Video

Venus

Its an Interior planet and it has no satelites.

Venus is the most dangerous planet of all the interior planet. The are sulphuric acid storms every day, winds that reach 400 miles/h, volcano erupcions and a very dangerus temperature, reaching the 480ºC.

They say that Venus was like Earth before, a planet with water, but because of the temperature the climate changed and now it dosen't look like Earth at all.

Mercury Video

Mercury

It is a interior planet.
Mercury is the closest planet to the Sun and the smallest planet in the solar sistem, without counting the nano planets.

It takes 88 days to orbit the Sun and 176 to rotate on its axis.

It is like our satelite, the Moon, it has a lot of craters on it. You can see them so much, because their atmosphere is very weak.

It has no satellites.

The Moon Was Born

About 4.4 billion years ago a object the size of Mars crashed  into our planet. It took big peaces of the Earth
out of it and in a hundred years one of the peaces formed into the spherical rock we call Moon.

Supernoves

Stars dont live for ever, but they lives for a long time.Some stars when they die the supernova occurs. It is a giant explotion that killes everything around it.

The nearast star to us is Alpha Centauri and it is 4.3 light years away. If it exploded would we have 4.3 years beofore we died? No, we woudn't. We would die at the same time.
A supernova will occur once every 200-300 years in each galaxie.