Question 18(3 points)

When we discussed the first time that humans managed to measure the size of the Solar System (or distance to planets), I showed an astronomical event that was observed from both Europe and South Africa, at the same time. What event was this, and did it last longer in Europe or South Africa?

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Question 19(6 points)

In our discussion of extrasolar planets, I gave an example of a star with several planets that were discovered through their transits. If all those planets happen to be transiting at the same time (and do not block each other), what fraction the light from the star will be blocked? Give your answer in percentage, with 2 significant digits.

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Question 20(4 points)

In our discussion of Weight in Space, we explored three scenarios: a person standing on top of a tall tower jumping forward at three different speeds, which resulted in three distinct orbits. Which orbital shape resulted from the fastest jumping speed for our brave protagonist in these scenarios? Compute this speed in km/s, to 2 significant digits.

(You can ignore air friction, and assume the height of the tower is much shorter than the radius of Earth)