Lecture 10

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University of Virginia *

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1210

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Astronomy

Date

Oct 30, 2023

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1

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Announcements HW 3: Spectroscopy and Telescope Basics Due tonight HW 4: Telescopes, Nature of Science, and the Sun Due Feb 15th Important Dates Quiz 1: Feb 22nd Penalties for RRRT lab begin: Feb 27th Modern Telescopes and the Sun Regarding the angular size of objects - useful for HW An object’s angular size appears smaller if it is farther away θ=s/d (angular size here is in radians Next Gen: James Webb Space Telescope (JWST)- an Infrared Telescope Primary objectives of the JWST Observe the first galaxies in the Universe Give insights into the births of stars and planets Look for exoplanets with the potential for life Many secondary objectives as well JWST distance: well beyond Moon’s orbit No human has ever traveled beyond the Moon, therefore repairs to it are likely impossible with modern technology. It had to deploy itself If any one of the 344 single points of failure went wrong, the mission would have been a failure JWST orbit location: lagrange points JWST orbits an unstable equilibrium point where the Earth and Sun’s gravity are in balance. Fuel is required to keep it at this point How can Multiple Telescopes Work Together Interferometry A technique for linking two or more telescopes so that they have the angular resolution of a single large one Easiest to do with radio telescopes Now possible with infrared and visible-light telescopes
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