1. Unit-5 The universe
By Diego G.,Mariana,Sandra
and Anderson

2. Satellites are smaller
celestial bodies that
orbit the planets. The
moon is the Earth’s
only satellite,but
Jupiter has more than
sixty!
Satellites

3. Dwarf planets are
spherical bodies that
orbit the Sun.They
are much smaller
than planets.Until
2006,astrologers
considered Pluto to be
a planet , but now it
is classified as a dwarf
planet.
Dwarf planets.(Pluto and the Earth.)

4. Small Solar System bodies

A small Solar System body (SSSB)is an
object that is neither a planet nor a dwarf
planet.This group includes asteroids and
comets.

5. Small Solar System bodies
Asteroids are small,rocky objects that
orbit the Sun.They are mostly found in
two regions :
The asteroid belt, between Mars and
Jupiter,and the kuiper belt,beyond
Neptune.

6. Comets are giant
balls of ice. They orbit
the Sun in a
long,elliptical
path.When they get
close to the Sun,they
show a bright tail that
reflects light.
Halley’s Comet is
the best known. It
can be seen every 76
years. It last
appearance was in
1986.
Comets

7. 
Sometimes,asteroids and comets crash
into a planet. The impact of these large
bodies can have serious
consequences.Scientists believe that a
giant asteroid collided with Earth 65
million years ago. This changed the
Earth’s climate and may have caused the
extinction of the dinosaurs.

8. When small celestial
bodies the size of dust
particles burn up as
they enter the Earth’s
atmosphere ,we see
shooting stars.
Shooting stars.

9. Meteorites are bodies
that are too large to
burn up completely,so
they crash into the
Earth.
Meteorites

10. Asteroid ida 243 is
located in the asteroid
belt between Mars
and Jupiter. It is 58
kilometers long.
Asteroid Ida 243

11. The meteor crater
in Arizona is the best
preserved meteorite
crater on Earth. It
was created 50,000
years ago when a 50
m diameter meteorite
crash into the Earth.
The meteor crater in Arizona.

12. Shooting stars. The
Leonid Meteor Shower
of shooting stars.It
occurs when debris
from the comet
Tempel-Tuttle crosses
the Earth’s path. Most
shooting stars are
really rocks that burn
up as they enter the
Earth’s atmosphere.
The Leonid Meteor Shower

13. Question…

14. What type of celestial body is
shown in each picture?

15. Comet
Asteroid

16. +information :About dwarf planets

17. +information
In 2006 the International Astronomical Union adopted
the term ‘dwarf planet’ for solar system objects that
were bigger than small solar system bodies such as
comets and asteroids but not quite planets.
 The definition of a dwarf planet is an object orbiting
the Sun that is large enough to be rounded by its own
gravity but is not gravitationally dominant in its
orbital area and is not a moon.
 As of 2008, there are five recognized dwarf
planets: Pluto, Ceres, Eris, Makemake & Haumea.
 There are a number of other candidates for the status
of dwarf planet. Some of these classifications could
be resolved as NASA’s Dawn and Horizon missions
venture towards Pluto in the coming years.


18. Pluto
Pluto
 Pluto hit the headlines in 2006 when it
was demoted from a planet to a dwarf
planet by the International Astronomical
Union. While most astronomers agreed
with the new classifications, some
disagreed and still refer to Pluto as the
ninth planet.


19. Ceres
 Ceres is located in the asteroid belt
between the orbits of Mars and Jupiter. It
was discovered in 1801, well before Pluto
and 45 years before Neptune. Ceres was
considered a planet for around 50 years
before being reclassified as an asteroid
and once again in 2006 as a dwarf planet

Ceres

20. Eris
 Eris was discovered in 2005 and was
referred to as the tenth planet until it was
reclassified in 2006. It is the largest of the
dwarf planets

Eris

21. Makemake
 Makemake was discovered in 2005 and
the third largest dwarf planet behind Eris
and Pluto.
 Haumea
 Haumea was discovered in 2004 and
named a dwarf planet in 2008.

Makemake and Haumea

22. Page 57. Unit-5.