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Transcript
Telescopes Stars are too far away to ever study directly. It would take 19,000 years to reach the nearest star, a mere 4 light years away traveling at 240,000 km/hr (150,000 miles/hr) the world record for current space travel speed! So all the evidence we gather about stars to form our theories of the Universe comes in the form of the electromagnetic spectrum, or in everyday words, light! Light is gathered and analyzed in one of the most critical of all scientific instruments, the telescope. Use pages 590-596 in the textbook to answer the questions below. 1. Who first used a telescope to observe the night sky? What year was it? 2. How does light travel through space? What kind of radiation is light? What do we call the form of light we can see with our eyes? What is a wavelength? 3. Name all the forms of "light" in the electromagnetic spectrum. Where does visible light lie on the electromagnetic spectrum? 4. What do telescopes do? What is the name of the type of telescope you can look though with your eye? What does a refracting telescope use to gather and focus light? What year did Isaac Newton build the first reflecting telescope? What does a reflecting telescope use to gather and focus light? 5. What is a radio telescope? Why are they so large? 6. Why are observatories often located on mountain tops? What is the problem with the atmosphere for optical telescopes? What is the problem with city lights for observing? How do computers help optical telescopes make clearer images? 7. Why types of electromagnetic waves are blocked by Earth's atmosphere? Why are some telescopes placed in orbit around Earth? Can you name the most famous space telescope?