1. ASTEROIDS AND
METEORITES

2. Which is the diference between
asteroids and meteorites?
An asteroid is a minor planet. They are small Solar
System bodies in orbit around the Sun. There are
thousands of them grouped in the main asteroid belt
between Mars and Jupiter. They are smaller than planets
but larger than meteoroids. An asteroid can range from a
few meters wide to hundreds of km wide. In general,
they are rocky bodies that do not have an atmosphere,
although some have a high metallic content. A few have
their own moons.

3. A meteorite is any object that has entered
the atmosphere of another object and
survived to impact the surface. Mostly they
come from asteroids and comets. They
become meteors when they fall through a
planet’s atmosphere; leaving a bright trail
as they are heated by the friction of the
atmosphere, they are shooting stars.

4. Asteroids
We can find the biggest concentration of asteroids in the
asteroid belt. It was formed during the formation of the
solar system. The agrupation of this asteroids could
have formed a new planet but due to the gravitational
force of Jupiter, it couldn't.
Since their creation until now, the asteroid belt have
changed a lot due to space weathering from radiation,
surface melting from impacts and bombardment by
meteorites.

5. Ceres
In 1801, Giuseppe Piazzi discovered by accident the first
asteroid called Ceres, and was originally considered a
new planet. This was followed by the discovery of other
similar bodies, which, with the equipment of the time,
appeared to be points of light, like stars, but they could
be distinguished from stars due to their apparent
motions. Ceres is located between Mars and Jupiter.

7. Vesta
Main asteroids
Pallas
Juno
Eros

8. Meteorites
We can classify meteorites depending on their
composition:
-Chondrites. They are stony meteorites that have not
been modified due to melting.

9. -Achondrites. It is a stony meteorite. It consists of
material similar to terrestrial basalts or plutonic rocks.
They have been exposed to a high degree due to
melting.

10. -Iron meteorites. They are meteorites that are made of
nickel and iron.

11. -Stony-iron meteorites. are meteorites that consist
of nearly equal parts of meteoric iron and
silicates.

12. Meteorite falls
Most meteorite falls are easily seen by its fireball
or the impact of the object on the ground.
Meteorites can fall with the same probability
everywhere on Earth, but meteorite falls tend to
be concentrated in areas with high human
population densities such as Europe, Japan, and
northern India.

13. Video
http://www.youtube.com/watch?v=OnJZXY_gPdo

14. MARIA
MARIA ANTÒNIA