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Through the Looking Glass
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Preamble
O, telescope, instrument of much knowledge, more precious than any sceptre, is not he who holds thee in his hand made king and lord of the works of God?
- Johannes Kepler
Galileo was not the inventor of the telescope. But he was the first to use it to make scientific discoveries! Almost everything we know about the Universe comes from this family of devices. The quest to see better, see more and see further never ends. The James Webb Telescope, successor to the Hubble Space Telescope, was launched last Christmas (25 Dec 2021).
This chapter has been prepared with Koh Zhi Yong and Gerald Kang Joon Kiat.
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Learning Objectives
At the end of this lesson, you will understand how distance and other physical quantities are measured in astronomy. You will also appreciate how the study of certain celestial objects help us to understand our Universe as a whole.