Actual test-yourself question from Astrophysics 2 - Exoplanets:
Which only proves the vital necessity for observatories of procuring a regular supply of fresh grad students.
That said, it's a nice illustration of why I like this course: there's serious stuff in there, but they don't forget their sense of humour. Another question asked whether the vibrations caused by nearby kangaroos jumping up and down might cause blurred spectral lines…
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