All We See Is Light

All We See Is Light

Today we have six questions, so we will take ten 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.

The topic today: spectra


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

  1. Who first measured and catalogued over 600 absorption lines in the Sun’s spectrum?

  1. Now we know something transitions between energy levels to emit light. What?

Screen Shot 2018-04-10 at 8.16.56 PM

  1. Who was the Director of Harvard College Observatory who used the strength of hydrogen lines to classify stars?

  1. Who is credited with ordering the spectral types O B A F G K M?

Screen Shot 2018-07-09 at 9.34.52 PM

  1. Most stars near our solar system are what spectral type?

  1. The brightest star in the night sky Sirius, is what spectral type?

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 September 24, from 8:00 am (eastern US) to 9:00.

Help Make the World a Better Place!

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.

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, September 24, 2018, our Periscope Trivia Contest was about spectra.

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. Joseph von Fraunhofer………. @speear40  

  2. electrons…………@ winterpinapples

  3. Edward Pickering…….. @speear40

  4. Annie Jump Canon……….@lnetnews

Screen Shot 2018-01-22 at 9.49.51 AM

5.  Spectral type M ….………@lnetnews

6.  Spectral Type A…………..@Pircano


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


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