Astronomy Pop Quiz: Moons of Jupiter

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

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

DMG procedures and expectations apply; 1) if you find a mistake, please let me know, and b) do your best.

IMG_3093 2

The topic today: moons of Jupiter, using the Observer’s Handbook 2018 from the Royal Astronomical Society of Canada. You can order your own by contacting them at this link,

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

  1. Name the Italian math teacher and astronomer who first discovered Jupiter’s moons in 1609.

Screen shot 2015-01-10 at 1.07.26 AM

  1. Which of the Galilean moons is actually larger than the planet Mercury? (Observer’s Handbook 2018, p. 24-25)

Skynet image of Saturn and moons I took last semester.
  1. “Of the 175 known natural satellites of the 8 solar

    Screen shot 2015-10-23 at 5.08.12 PM
    Waxing gibbous Moon

    system planets” (p. 24), how many DO NOT orbit the giant planets?


  1. (The answer must have two different numbers to fill in the blanks.) The orbital resonance of Io, Europa and Ganymede is “1 : ________  : ________” (p. 24)

  1. (The answer must be two words of direction, like north or east.) At UT 13:40 Tuesday, July 24, 2018, the moon Ganymede will transit the face of Jupiter.   Satellites move across the face of the Jupiter from __________ to _____________. (p. 235)

  1. What’s the total number of moons of Jupiter we have discovered (to date)?

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 July 23, from 8:00 am (eastern US) to 9:00.

Correct Answers……..Periscope Winners:

  1. Galileo……… . @Tatoolover26: Galileo used a simple “spyglass” he reproduced from written directions. Spyglasses were being used as a military tool, allowing armies to see the enemy at great distance. Galileo pointed his telescope upward. But Galileo wasn’t the first to examine the Moon with this new “telescope.”

  1. Ganymede…….. @EagleSoarsUSA:  What keeps Ganymede from being a “planet”?   It’s the first part of the IAU’s definition for the word “planet”. 1) If it orbits a planet, it’s a moon.

  1. three….…… …@Steelman_MJW: The three other natural satellites are our Moon, Phobos and Deimos. This year is a great opportunity to see the two moons of Mars. Aim your best telescope that way.

  1. 1 : 2 : 4………… ….@EagleSoarsUSA: For every one orbit by the moon Io, Europa will orbit Jupiter two times and Ganymede will orbit 4 times.  Is there an orbital resonance in the planetary orbits of our solar system?

  1. East to West… ……..@speear40:  When the moon is moving behind Jupiter it appears to move from west to east.  Have you ever seen a transit?

iPhoto Library 117
The transit of Venus in 2004  Barbara and I went to South Africa to view this rare transit.  Also, East to West!!


  1. 79 moons of Jupiter………… ….Steelman_MJW: Can you name them?

  • Participation Award: …… ……. @joelschultz I’ll match your contribution up to $200. Please visit my blog page “Want to show support?” And give generously to one of my charities. I support all four with either money, time or energy. They all do good.

Winners: make a contribution in the next 30 days to one of my charities listed on my blog and I will match your gift, up to $100. Tell the charity to contact me about your contribution.

Astronomy Pop Quiz topic: moons of Jupiter with the Observer’s Handbook 2018

Winners posted on July 23, 2018

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

“Let’s talk astronomy” this coming Monday beginning at Screen shot 2015-12-28 at 8.16.26 PM8 am eastern US time on Periscope.

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

Winners on my live show astronomy-related trivia questions correct will qualify for:

  1. Eternal Glory because you knew the answer! (yea!)

  2. International Reknown, because your screen name will be listed as a winner on my blog. And…

            drum roll, please…….

  1. An opportunity to increase your impact on making the world a better place.

How to increase your impact:

  1. correctly answer a trivia question participating in the live Periscope broadcast.

  2. Make a contribution within 30 days of publication of the Leader Board to one of the charities listed on my blog. You can find the list of my charities on the page “Want to Show Support?” pull down menu found on the home page of my blog.

Link here.

  1. Have the charity contact me to tell me the amount of your gift, and I will match it up to $100.

On Monday, July 23, 2018, our Periscope Trivia Contest was about the moons of Jupiter. The questions, the correct answers and the winners are given above. Congratulations to all winners and thank-you to all participants.

When you get the first correct answer to one of my questions, you are a winner. I usually have between five and ten trivia questions each Monday.

To the winners go Eternal Glory, World-wide declaration of their victories (on my blog), and an Opportunity to double their impact of making the world a better place.

You are welcome to join in the hour long fun most Mondays beginning around 8 am eastern time. With Periscope you can watch an earlier trivia game broadcast or participate in the next live Astronomy Pop Quiz   Periscope is a social media app available in the App store.

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