Today we have ten questions, so we will take ten minutes to complete the quiz.

With that in mind, , please get out a clean sheet of paper and a No. 2 pencil and prepare for today’s Astronomy Pop Quiz.

If you find a mistake, please let me know. Do your best.

The topic today: Europa

You have five minutes to complete the quiz. Begin now.

  1. Who discovered Europa?

Jupiter, king of the planets (image by D. Hands


  1. Within a tenth of a day, how many days does it take Europa to orbit Jupiter once?

  1. In the Arthur C. Clark novel 2010: Odyssey 2, humans are warned against doing something with Europa. What must we not do?

  1. In the “Observer’s Handbook 2018” the data table f the Galilean moons abruptly stops after October 11, because an object gets n the way of watching the Galilean moons. What object gets in the way?

  1. Even before the Voyager flybys, we could tell that Europa’s surface was composed mostly of what frozen chemical substance?

  1. What body has the smoothest surface of any known solid object in the Solar System?

  1. What are the streaks that we see on Europa’s surface?

  1. Research (Tuttle and Pierazzo of Arizona) concluded the ice on surface on Europa must be about how thick?

  1. What name have we given the areas on Europa that are awash with icebergs floating on a frozen sea?

  1. On Europa, how long does daylight last?

OK, pencils down. Let’s trade with a neighbor and check one another. Here are the correct answers and your “neighbor” who got the correct answer on my Periscope broadcast on November 12, from 8:00 am (eastern US) to 9:00.

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On my Periscope broadcast any player who is the first to give the correct answer to a question is a winner. Winners who make a contribution to one of my charities in the next 30 days will have their gift matched by me up to $100. My charities are listed on my blog.     Tell the charity to contact me about your contribution.

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Link here to my blog “An Island in the Sea of Mystery.”

You are welcome to play with us during the next live broadcast of

“Let’s talk astronomy” this coming Monday beginning at 8 am eastern US time on Periscope.

Periscope is a live video streaming app for Android and iOS available in the App Store.

On Monday, November 12, 2018, our Periscope Trivia Contest was about the Europa, one of the large moons of Jupiter.

The questions are given above, the correct answers and the winners are given below.

Congratulations to all winners and thank-you to all participants.

Play live on Let’s talk astronomy” 8 am on Mondays.

Correct Answers……..Periscope Winners:

  1. Galileo………. @   MelissaNarcissa: Galileo used his observations of the moons of Jupiter to defend the Copernican system, but even he realized that they did not PROVE helio-centrism.

  1. 5 days…………@ Pircano: Europa has a orbital semi-major axis of 671,000 km and an orbital period of 3.551 days. It’s orbital period is the same as it’s period of rotation, which means Europa keeps one face toward Jupiter. Our Moon is also tidally locked to Earth.

Movie poster over my desk
  1. Landing…….. @Fredzuki1 : The controllers of the monolith have hopes the life that lives in Europa’s oceans can become intelligent.  

  1. The Sun……….@speear40 : Jupiter’s conjunction with the Sun will be on November 26, 2018. On December 21, Jupiter will join Mercury in the dawn sky for a close conjunction with that planet.   Mercury will be mag -0.5 and Jupiter will be mag -1.8 so it should be worth getting out of bed early.

  1. water….………@HarrisonD24:  We could analyze the light being reflected by Europa’s surface, We can analyze the light from the sun, and any difference in the light reflected by Europa, or any other solar system body gives us clues as o the composition of the reflective surface.

  1. Europa …………..@Pircano: But not perfectly smooth.


  1. Fractures in the ice pack covering Europa’s oceans..@ BenSpiers: The ice will crack, leaving the giant fractures that look brownish in enhanced color images. Some of these fractures are dozens of kilometers wide. The brown is from sulfates and carbonates, hydrated salt minerals.

  1. 2 to 2.5 miles…………..@BenSpiers: Using the few craters on Europa to judge the thickness, Turtle and Picrazzo found the largest impact crater to be 24 km in diameter.

  1. Chaos…………..@speear40: Conamara Chaos was named after a rugged part of Ireland named for Conmac, son of the Queen of Connacht.

  1. About 43 hours…………..@speear40

Thanks goes out to all participants, and Congratulations to everyone who got one right.

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