1. In a ____ telescope, light passes through convex lenses

2. One major difference between an artificial satellite and a space probe is that the artificial satellite ____.

3.The first human to travel in space was

4. Of all the benefits of the space shuttle, the one that helps cut costs the most is that

5.What is the smallest planet in the solar system?

6.Which takes the most amount of time?

7. One astronomical unit equals

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