1. THE SOLAR SYSTEM AND THE
EARTH

3. THE SOLAR SYSTEM AND THE
EARTH

4. 1) The Universe
All the matter and space
that exists.
It includes celestial
bodies like:


5. Galaxy:

6. Stars:

7. Planets:

8. Satellites:

9. Asteroids:

10. Comets:

11. Meteorites:

12. Galaxy

An enormous cloud of stars and other
celestial bodies

13. Galaxy
An
enormo
us
cloud of
stars
and
other
celestial
bodies

Has 4 shapes:
1.
2.
3.
4.
Spherical
Elliptical
Spiral
Irregular
Our Galaxy is the Milky Way. It has a
spherical shape.

14. Stars
-A
celestial
body
with a
spheric
al
shape
- Made
of
gases
1.
Color
Example:
The sun is a yellow-orange star.
2.
Size
Example:
large star = giant star
small star = dwarf star
*The sun is a dwarf star!

15. Sun
Moves in two ways:
1.
2.
Rotation
Revolution

16. Planets
•
large spherical bodies that revolve around a
star

17. Natural Satellites:
•
•
smaller celestial bodies that revolve around
planets
the Earth has only one natural satellite: the
moon

18. Asteroids
•
•
bodies of rock
smaller than planets

19. Comets
•
bodies of rock and ice

20. Meteorites
•
•
Also called shooting star
Small pieces of rock from asteroids and
comets that travel through space

21. 2) Our solar system


part of the Milky Way (Via Lactea) Galaxy.
includes the Sun and all the celestial bodies that
revolve around it, such as:
• Planets
• Natural
satellites
• Asteroids
• Comets
• Meteorite
s

22. Planets
Inner planets:
Mercury The Earth
Venus
Mars

Outer planets:
Jupiter
Saturn
Uranus
Neptune
•

23. 3) How does the Earth move?



Rotation:
The Earth rotates on an imaginary axis.
It takes 24 hours.

24. 3) How does the Earth move?



Revolution:
The Earth revolves around the Sun in an
elliptical orbit.
It takes one year (365 days, 6 hours
and 9 minutes).