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Sec 1 - Chapter 2 and 3

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The slideshow from class. Us it to review for your test. Go over the notes and questions too.

The slideshow from class. Us it to review for your test. Go over the notes and questions too.

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Transcript

  • 1. The Size of the Solar System
  • 2. Radar• The first known radar was built in 1935.• It emitted mircowaves which allowed us to determine the distance to an object by timing how long it takes for the microwave to be reflected back to source.• Radar lets us determine the size of celestial bodies and their distance from us.
  • 3. • Bats use radar to locate obstacles and prey.• Bats produce a particular sound and then listen for its echo.• We cannot hear a bats “radar” sound
  • 4. The Solar System: Like a Grain of Sand on the BeachRead page 25 together.What is the speed of light?• 300 000 km/s or 300 000 000 m/s• This is how far light goes in one year:
  • 5. • Our galaxy is called the Milky Way.• What is a galaxy?• A group of stars and other celestial bodies.• The Milky Way is over 100 000 light years wide!!• How long does light from the Sun take to reach the Earth?• 8.3168708 minutes.• Rounded off, lets say 8 minutes and 18 seconds.
  • 6. What happened to the space shuttle, Columbia?• Exploded during takeoff on February 1, 2003.• By recovering debris from the space shuttle and analyzing the debris they were able to identify which part of the space shuttle exploded.
  • 7. The Experimental Method• Galileo built his telescope in 1606. He was the first to use it to observe the sky.• Things he discovered:• Saturn’s Rings• Jupiter’s satellites• The Phases of Venus• And much more!!
  • 8. • His observations of Venus proved that the Earth travelled around the Sun.• His telescope made these observations possible.• By improving technology, we are able to continue improving scientific knowledge.• We will read pages 433 - 435
  • 9. How to Apply the Experimental Method• There are 5 steps:1. I observe…2. I develop a research question…3. I define the variables…4. I experiment…5. I analyze my results and present them>
  • 10. The Solar System: Like a Grain of Sand on the BeachRead page 25 together.What is the speed of light?• 300 000 km/s or 300 000 000 m/s• This is how far light goes in one year:
  • 11. • Our galaxy is called the Milky Way.• What is a galaxy?• A group of stars and other celestial bodies.• The Milky Way is over 100 000 light years wide!!• How long does light from the Sun take to reach the Earth?• 8.3168708 minutes.• Rounded off, lets say 8 minutes and 18 seconds.
  • 12. The Sun• The closest star to the Earth.• A ball of gas made primarily of hydrogen (H)• The Sun is 5770 °C on the surface• The Sun is 15 000 000 °C at the center!
  • 13. • The Sun is part of our galaxy, the Milky Way• What is a galaxy?• A group of planets and other celestial bodies.
  • 14. • The Sun acts like a huge nuclear reactor turning hydrogen (H) into helium (He).• It is thought the Sun will be active for another 5 billion years.• At this time, the Sun’s diameter will increase and it will swallow the Earth!!• It will be 2000 °C on Earth.• Then the Sun will cool and die.
  • 15. Ambulance Sirens• The Doppler Effect is what we hear as the s]ambulance gets closer and then moves away.• The siren seems to become more high pitched as the ambulance gets closer and less high pitched as it moves away.• Why?• Shall we listen?
  • 16. • Sound waves move like waves on the water.• As the waves move away from the point of contact the space between the waves becomes larger.• This means they are more spread out in the air.• As the sound waves get farther apart the sound has a lower pitch.
  • 17. • The Doppler Effect and light waves• Light waves also create circular waves• Light waves that are close together correspond to violet light.• Light waves that are farther apart are correspond to red light.
  • 18. • As the planets move farther away, they become “red”
  • 19. E R E R L N I D A L E U DI O N L E E G L G O N O E E W T• How can we remember the order of the colors?

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