Astronomy lesson 1
- 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)rEvolution of Earth around thE sun (thE path in which thE Earth rEvolvEs 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. 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 revolution of Earth around the sun results in Four Seasons