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New Player | Log In FREE! Click here to Join FunTrivia. Thousands of games, quizzes, and lots more! H-R Diagram Trivia Quiz

The H-R Diagram is like the periodic table of stars. Simply knowing how to read it will tell you everything you need to know about a star.

A multiple-choice quiz by random_quasar. Estimated time: 3 mins.

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Share on Facebook Share on Twitter Share by E-Mail Author random_quasar Time 3 mins Type Multiple Choice Quiz # 241,678 Updated Dec 03 21 # Qns 10 Difficulty Average Avg Score 6 / 10 Plays 1598 Last 3 plays: Bitterbill (7/10), Guest 5 (8/10), Guest 136 (8/10). Single Page Question 1 of 10 1. What is the proper name of the H-R Diagram? Hint Heat- Radiance Diagram Horizontal- Redshift Diagram That is the proper name Hertzsprung- Russell Diagram

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Question 2 of 10 2. What does the H-R Diagram plot? Hint spectral class and absolute magnitude spectral class and temperature absolute magnitude and luminosity temperature and mass

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Question 3 of 10 3. What is the most commonly used mnemonic for spectral classification? Hint Oh Bad And Furry Gorilla, Kill Me. Oh Be A Fine Guy/Girl Kiss Me My Very Educated Mother Just Served Us Nachos ROY G BIV

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Question 4 of 10 4. The majority of the stars in the H-R Diagram are found where? Hint bottom right corner spectral class F main sequence uppermost left corner

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Question 5 of 10 5. The H-R Diagram can also be used to find: Hint age distance density extraterrestrial life

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Question 6 of 10 6. Where are the solar diameters of stars plotted on the H-R Diagram? Hint Diagonal lines (top left to bottom right) The x-axis Solar diameters are not plotted on the H-R Diagram. The y-axis

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Question 7 of 10 7. White dwarfs are found at the bottom-left corner of the H-R Diagram. True False

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Question 8 of 10 8. There are more supergiants than giants on the H-R Diagram. True False

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Question 9 of 10 9. Which of these is not typically found on the H-R Diagram? Hint white dwarfs supergiants giants red dwarfs

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Question 10 of 10 10. Our star (the Sun) is part of the main sequence. True False

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Most Recent Scores Dec 16 2025 : Bitterbill: 7/10 Dec 07 2025 : Guest 5: 8/10 Nov 18 2025 : Guest 136: 8/10 Nov 12 2025 : Guest 121: 7/10 Score Distribution Quiz Answer Key and Fun Facts 1. What is the proper name of the H-R Diagram? Answer: Hertzsprung- Russell Diagram It is named after its two designers Ejnar Hertzsprung and Henry Norris Russell. 2. What does the H-R Diagram plot? Answer: spectral class and absolute magnitude The H-R Diagram plots spectral class (aka temperature) and absolute magnitude (aka luminosity). 3. What is the most commonly used mnemonic for spectral classification? Answer: Oh Be A Fine Guy/Girl Kiss Me The spectral classes in order of decreasing temperature are: O, B, A, F, G, K, and M. One uncommon variation of this mnemonic is "Oh Be A Fine Guy/Girl Kiss My Lips Tenderly". It was made to include L and T, which are given to stars that are so small they do not generate enough heat to begin nuclear fusion. 4. The majority of the stars in the H-R Diagram are found where? Answer: main sequence A star spends most of its life in the main sequence burning hydrogen fuel. Once the star has stopped burning hydrogen, it leaves the main sequence, evolves, and dies. 5. The H-R Diagram can also be used to find: Answer: distance Distance can be found by both main-sequence fitting for stellar clusters, and by spectroscopic parallax for individual main-sequence stars. 6. Where are the solar diameters of stars plotted on the H-R Diagram? Answer: Diagonal lines (top left to bottom right) The solar diameters of stars are plotted on diagonal lines that cross the diagram. Our Sun (at one solar mass) is on the most central diagonal line. 7. White dwarfs are found at the bottom-left corner of the H-R Diagram. Answer: True They are very small (that is why they are at the bottom), but also very bright (B or A spectral type). 8. There are more supergiants than giants on the H-R Diagram. Answer: False Supergiants are rare, giants are more common and found on the RGB (Red Giant Branch). 9. Which of these is not typically found on the H-R Diagram? Answer: red dwarfs Most H-R Diagrams exclude red dwarfs, although they exist. When they are included in the H-R Diagram they are found in the bottom-right corner. 10. Our star (the Sun) is part of the main sequence. Answer: True The Sun is now a part of the main sequence. In a few billion years the Sun will move up in the H-R Diagram, becoming a red giant, and eventually, a white dwarf. Source: Author random_quasar This quiz was reviewed by FunTrivia editor crisw before going online. Any errors found in FunTrivia content are routinely corrected through our feedback system. Related Quizzes 1. What are the Names of these Constellations? Average 2. Need a Light? Easier 3. The Brightest Star in the Sky Easier 4. Echoes Throughout The Night Very Easy 5. I Spy in the Night Sky Easier 6. Like a Diamond in the Sky Average 7. How Many Times Must A Man Look Up? Easier 8. Star Gazing 2 Very Easy 9. The Stars We Find Along The Way Easier 10. If It's Any Constellation Average 11. A Starry Night Average 12. Sunset Leads to Morning Easier Referenced Topics Science Astronomy Names Periodic Table The Sun Sequences Mnemonics White Other Destinations Explore Other Quizzes by random_quasar Go to Astronomy Quizzes More Stars Quizzes FunTrivia Homepage 1/10/2026, Copyright 2026 FunTrivia, Inc. - Report an Error / Contact Us