The document discusses different types of telescopes used in astronomy. It describes refracting telescopes which use lenses and reflecting telescopes which use mirrors. Most large telescopes found in observatories are reflecting telescopes because it is easier to build large mirrors that can collect more light. The document also discusses other types of telescopes like infrared telescopes that can observe invisible light beyond the visible spectrum.

2. Astronomy
The study of the universe which is everything that exists ,including Earth ,the planets ,the
stars and all space.

3. Telescope
• A device that collects light and magnifies images to make distant
objects appear closer ,larger and brighter.

4. Types of Telescopes
Using invisible light
Any light frequency in
electromagnetic
spectrum that people
cant see
Using visible light
The light that you can see
and detect with your eye

5. Visible light Telescope
Refracting Telescope Reflecting Telescope

6. RefRacting telescope
• It uses lenses to gather light from faraway objects .
• In refracting telescope the light is bent and focused on
objective lens.
• The image is then magnified by lens in the eyepiece.

7. Reflecting telescope
0
• Visible light reflects off a series of 2 or more mirrors, which
amplify the image before it reaches the lens in the eyepiece.

8. What kind of telescope would you expect to
find in most observatories?
•It is easier to build large mirrors together more light
so most large telescopes are reflecting telescopes.

9. Invisible light Telescope
• Invisible light frequency in electromagnetic spectrum that
people cannot see.
• Special telescopes can detect waves such as radio
waves ,radar, infra red waves ,ultraviolet light , X-ray.
• These telescopes can gather information that cannot be
observed using visible light.

10. Why might astronomers study objects in space with
an infrared telescope?
To gather information not obtainable with
visible light ,like X-rays.

11. Earths’ rotations
• thE Earth has 2 typEs of MovEMEnts:
1) rotation of Earth around itsElf (its axis)
2)rotation of Earth around thE sun
(thE path in which thE Earth rotatEs around
thE sun is callEd orbit )

12. 1)Earth’s rotation around its axis
Earth’s axis
is an imaginary line that
passes through the north
and the south pole
The part of the Earth away
from the Sun
Night
The part of the Earth facing
the Sun
Day Time

14. • thE Earth takEs 24 hours to rotatE around its
axis or itsElf .
• this rotation rEsults in
day and night
whErE thE part of thE Earth facing thE sun is “day
tiME” and thE part away froM thE sun is “night”

15. Standard time Zone
• In 1884,standard time were set up in 24 time zones around the
world.
• Each time zone represents one hour of the 24 hours of the
day .
• All the places within the same time zone uses the same time.
• If you travel east from one time zone to the next the time is
increased by 1 hour ,and if you travel west the time is
decreased by 1 hour.

16. World time Zone

17. Africa Time zone

18. USA Time Zone

20. If it is 8:00 pm mountain standard time(Denver) .What time is in Atlanta which
is found in Eastern Standard time ?

21. International Date Line
What would happen if you traveled west across the “International Date Line”?

22. Shadow

23. Shadows

24. Exploring SpaceSpace probes send images and data back to Earth for scientists to
interpret.
Artificial satellites are sometimes sent into space by astronauts on a
space shuttle (reusable spacecraft).
After the mission astronauts ride back to Earth in the shuttle.
“Hubble Space Telescope”

25. What is the difference between planetary images taken from
Earth and those taken from space?
•Images taken from Earth would have
less sharpness and detail than those
taken from a satellite or a probe
because Earth’s atmosphere would
interfere with the quality of photos

26. 2)The earTh’s revoluTion around The sun

27. • The rotation of Earth around the sun results in
Four Seasons