1. What would happen to Earth if the Sun were turned off today?
Think About It…
What would happen to Earth if the Sun were turned off today? 1

2. Twinkle, Twinkle, Our Big Star! Continued…
Lesson 7
Twinkle, Twinkle, Our Big Star! Continued… 2

3. Tools of Astronomy
Tools of Astronomy
The light that comes to Earth from distant objects is the best tool that astronomers can use to learn about the universe.
In most cases, there is no other way to study the cosmos except to analyze the light that we receive from it.

4. Radiation
Electromagnetic radiation consists of waves of electrical and magnetic disturbances.
It includes visible light, infrared energy, ultraviolet radiation, radio waves, microwaves, X rays, and gamma rays.

5. The Electromagnetic Spectrum…
c. Organizes the forms of EM
energy
EM energy…
d. is classified by wavelength and frequency
e. moves at the speed of light 5

6. Radiation
Electromagnetic radiation travels at the same speed and is classified by:
Wavelengths—the distance between peaks on a wave.
Frequency—the number of waves or oscillations occurring per second.

7. The Electromagnetic Spectrum… 7

8. 2. Energy Flows From the Sun…
A. by the process of radiation 8

9. Energy Flows From the Sun…
Radiation
B. the transfer of energy through space by visible light, ultraviolet radiation, and other electromagnetic waves
C. All substances that have temps over absolute zero emit radiation!
D. The hotter the substance, the shorter the wavelength. 9

10. 3. Absorption of The Sun’s Energy by the Earth…
A. about 50% of incoming solar radiation is absorbed by the Earth. 10

11. Absorption of The Sun’s Energy by the Earth…
C. Which gas absorbs harmful ultraviolet radiation from the sun?
Ozone 11

12. Differential Heating…
D. Which heats up and cools down more slowly?
Water or land?
This is called differential heating.
This is what moderates (tempers) the climate in coastal areas.
water 12

13. 4. Photosynthesis… 13

14. Photosynthesis
During the process of photosynthesis, solar energy is transformed into
______________ energy.
chemical

15. Food From the Sun! 15

16. plants
b. Photosynthesis occurs in __________, algae, and some bacteria.

17. Photosynthesis needs…
water
Carbon dioxide
Light

18. In plants, photosynthesis occurs in cell parts called
chloroplasts

19. Solar Wind and Earth’s Magnetic Field…
Earth’s magnetic field protects us from the solar wind by…
deflecting these particles and trapping them in two huge rings called the Van Allen belts 19