From Galileo to Hubble --

Challenge

Challenge #1

Let's review what you have learned so far. Select the BEST answer to the following two questions. When you are finished, submit your answers to the server by pressing the "Submit Answers" button at the end of the page.

If you need to start over, press the "Clear ALL Answers" button at the end of the page to erase all your selections.

1. In what year did Galileo make his first observations?
a. 1509
b. 1609
c. 1709
d. 1809

2. Refractor telescopes use lenses while reflector telescopes use mirrors. What kind of telescope did Galileo use for his observations?
a. refractor telescope
b. reflector telescope