1. Unit E – Space Exploration
Lesson 4-5: (Sec 3.1 and 3.2)
Using Technology to See the Visible and Using Technology to See Beyond the Visible

2. A. Optical Telescopes light is collected and focused into an image
use to form an image…
refracting telescopes
2 lenses
maximum diameter of about 1 m
slide 1 of 5

3. 1 lens and several mirrors reflecting telescopes
use to form an image...
1 lens and several mirrors
reflecting telescopes
larger (6 m)
slide 2 of 5

4. enormous light-gathering ability and resolving power
can be used to make with
segmented mirrors
enormous light-gathering ability and resolving power
one large telescope
slide 3 of 5

5. B. Combining Telescopes
is a technique where
2 or more telescopes are used together to improve resolution
interferometry
eg) Keck I and Keck II at Mauna Kea
Very Large Telescope (VLT) in Chile
slide 4 of 5

6. C. Hubble Space Telescope
limits the of telescopes on
light and air pollution
resolution
Earth
the Hubble Space Telescope is a
reflecting telescope that orbits at an altitude of 600 km
slide 5 of 5

7. Using Technology to See Beyond the Visible
3.2
Using Technology to See Beyond the Visible

8. A. Electromagnetic Spectrum
give us information based on
optical telescopes
visible light
many objects in space emit
radio waves, X-rays, infrared (heat) rays, gamma rays etc
is energy that travels at the
electromagnetic energy
speed of light
slide 1 of 7

9. electromagnetic energy has different wavelengths and frequencies
wavelength is the distance from one point on a wave to the same point on the next wave
frequency is the number of waves passing a single point per second
different forms of electromagnetic energy form the
electromagnetic spectrum
slide 2 of 7

10. slide 3 of 7

11. B. Radio Telescopes used to study
radio waves emitted by objects in space
radio waves are not affected by
weather, pollution or the atmosphere
can be used to study the in space
distribution of matter
slide 4 of 7

12. must be since radio waves have a very large (300 m diameter)
long wavelength
slide 5 of 7

13. C. Radio Interferometry
combine to get
multiple radio telescopes
greater resolution
can be arranged in large groups called to increase of measurements
arrays
accuracy
can be used to see
planets orbiting distant stars
slide 6 of 7

14. D. Space Probes
not all questions can be answered by Earth-based telescopes
are unmanned that put
satellites and “landers”
space probes
equipment on or close to other planets
slide 7 of 7

15. Assignment
Worksheet 7