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Why are reflecting telescopes used

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Question 1: Why are reflecting telescopes used in preference to refracting telescopes at major observatories today?

Question 2: Pluto has been reclassified as a dwarf planet rather than a planet. How is a dwarf planet defined, and what led to this reclassification?

Question 3: The classification of living organisms has been revised with a "three domain" system replacing the previous "five kingdom" system. What led to this revised classification, and what are the main features of the new system?

Question 4: In order to measure the radial velocity of a star (the speed of motion towards or away from us) what type of instrument would be used and how would the data be used to derive the velocity?

Question 5: What is meant by the "RNA world"?

Question 6: What is the current evidence for the presence of an ocean below the ice on Jupiter's moon Europa, and what tests could be carried out by future missions to confirm the existence of an ocean, and measure the thickness of the ice?

Question 7: What is meant by the "Early faint sun paradox" in the history of the Earth and how has the "paradox" been resolved?

Reference no: EM132450400

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