The document discusses astronomy and different types of telescopes. It describes how telescopes work to magnify distant objects using lenses or mirrors. Reflecting telescopes, which use mirrors, are most commonly used in large observatories because it is easier to build large mirrors. Invisible light telescopes can detect wavelengths like radio waves and infrared that are not visible to the human eye, allowing astronomers to gather additional information about objects in space.

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
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•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:
(1Rotation of Eartharound itself (its axis)
2)Rotation of Eartharound the Sun
(The path in which the Earthrotates aroundthe 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. Shadow

16. Shadows

17. 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”

18. 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

19. 2)The Earth’s Revolution around the Sun

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