Presentation on theme: "Components of the Universe Review REGULAR. List the stages in the life cycle of an Average Star: Nebula – area of dust and gas where stars are formed."— Presentation transcript:
What force keeps the stars together in a galaxy? GRAVITY!!!
What type of galaxy is the Milky Way Galaxy? Our Milky Way galaxy is a spiral galaxy. We do not have actual pictures of our entire galaxy because we do not have the technology to send something that far out to take a picture. Not our actual Galaxy
Where is our solar system located in the Milky Way Galaxy? We are located in one of the spiral arms of the galaxy about 25,000 light years from the center and 25,000 light years from the edge.
Wavelength Define Wavelength: The distance from crest to crest or trough to trough in a wave What is the Longest Wavelength? Radio Waves (longest length, lowest energy) What is the Shortest Wavelength? Gamma Rays (shortest length, highest energy)
How is wavelength related to energy? As wavelength decreases (gets smaller), the energy increases. Shortest wavelength, highest energy Longest wavelength, lowest energy
What do light years measure? If a person orbiting a star 20 light years away were observing Earth right now and you were outside on a clear day, would they be able to see you? Why or Why not? If the person is 20 light years away, then the light they are viewing left Earth 20 years ago. The would not be able to see you because you would not have been born yet.
Evidence of Big Bang theory: Red Shift Galaxies are moving away from each other really fast, causing the wavelength of visible light to stretch out. Stretching the wavelength makes them appear more red. Background Radiation – Scientists have found radiation, which is from the initial explosion of the “Big Bang” Background Heat - The temperature of the Universe is above absolute zero, meaning the tremendous amount of heat released during the Big Bang is still cooling off
What is the relationship between Luminosity and Temperature shown on the diagram? As temperature increases, so does luminosity.
Complete the chart for the Electromagnetic Spectrum Wavelengths Type of WavelengthUse or EffectSize Radio Broadcasting10 3 Longest Microwave Satellite communication Cooking 10 -2 Infrared Detects Heat energy10 -5 Visible Light Visible to human eye10 -6 Ultraviolet Causes Sunburn10 -8 X-ray Medical images10 -10 Gamma Ray Cancer treatment10 -12 Shortest :