Studying for Intro Astronomy Exam: Galileo & Star Spectral Class

AI Thread Summary
Galileo is credited with discovering four moons of Jupiter, but the phrasing "some moons" makes the answer ambiguous. He is also known for his significant use of the telescope, though he did not invent it. For the question regarding the spectral class of stars, the most important property is surface temperature. This is crucial for classifying stars into their respective spectral classes. Understanding these concepts is essential for success in an introductory astronomy exam.
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Hello All,

I am studying for my introductory astronomy exam and I came about these two question;

Galileo discovered

a) radioactivity b) some moons of saturn c) 2 moon of Mars d) some moons of Jupiter e) the telescope

I know he discovered 4 moons of Jupiter but "some" is a bit tricky. He definitely discovered the telescope. Not sure which to choose

Also, The most important property of a star in determining its spectral class is

a) surface temp
b) mass
c) luminosity
d)composition
e) age

I think A
 
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Some moons of Jupiter, definitely. He didn't invent the telescope, merely used it spectacularly.
 
Thanks
 

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