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Gravitational Lensing: Summarize the observational evidence that a gravitational field can deflect the path of light. In figures such as 16.8 on page 451, how would you prove to a skeptic that the distorted images indicated by the arrows are indeed multiple images of a single gravitationally-lensed galaxy. Muster as much observational evidence as you can.
Measurement System
A comprehensive set of instruments, standards, and rules for quantifying physical quantities or dimensions.
Leaning Tower
Referring usually to the Leaning Tower of Pisa, a famous architectural landmark in Italy known for its unintended tilt.
Stonehenge
A prehistoric monument in Wiltshire, England, consisting of a ring of standing stones, believed to have been constructed from 3000 BC to 2000 BC.
Thumbs Up
A gesture or an expression used to indicate approval or success.
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