astronomy questions help??

[Haidi M]

1.what did Galileo do that no astronomer before him had ever done?

2. what discovery did Galileo make about jupiter, and why was it so important ?

3. identify briefly four fundamental astronomical discoveries made by Galileo in 1609 and 1610. other than that previous question?

4. was galileo a geocentric astronomer, or a heliocentric one?justify your answer?

[Carlos_dfc]

I hate to do someone's homework for them - when I was studying, I was under the impression that the whole point of homework was to get the student to do some research, not to just ask somebody to supply them with the answers.

However, I will nudge you in the right direction.
Try 'Wikipediea' - I'm sure they'll have most of the answers, and any they don't have, there'll be links through to other websites containing more info.