• The universe is all the matter, energy and space that
exists. It's made up of galaxies, which contains
• Stars can have planetary systems made up of
planets and satellites.
• Gallaxies are separated by vast spaces.
• Oficially, there are 8 planets:
Uranus and Neptune.
• However, we separate the planets in to to
different parts: The inner Planets (Mercury,
Venus, The Earth and Mars) and the outer
planets ( Jupiter, Saturn,Uranus and
Neptune).There are separated with the
asteroid belt.The inner planets are made
mainly of rock and the outer planets are
made mainly of gases.
Mercury is the smallest planet and is the
clotest to the Sun.
Venus rotates in the opposite direction.
The Earth is the only planet with life.
Mars has a very thin atmosphere.
Jupiter is the largest planet, with 63 satellites.
Saturn has a system of rings.
Uranus axis is almost horizontal.
Neptune has the greatest distance from the
We have our main planets, but what about
our dwarf planets? The most important dwarf
planets are Pluto, Ceres and Eris. Actually,
Pluto used to be considered a main planet,
but in 2006, the International Union of
Astronomers reclassified as a dwarf planet.
What are small solar system
• There are two main types: asteroids and comets. The
orbit the Sun.
• Asteroids are rocky object which are irregular in shape.
Asteroids orbit around the sun. most of them are
between the orbits of mars and jupiter. this area is called
the asteroid belt.
• Comets are small bodies that travel around the sun in
highly elliptical obits. they are irregular shape. the
nucleus is made up of a mass of ice dust and gas.
Constellations are imaginary patterns of bright stars. All societies
have invented constellations. The Ancient Greeks invented the
constellations we call the twelve sings of the zodiac.
There are 88 officials constellations. However, most of them do not
really look like the mythical figures they represent.
The night sky looks different in the Northern and Southern
hemispheres. The position of the constellations changes with the
seasons because of the movement of the Earth.
Some constellations are: and