A variable star expands and contracts regularly, causing it to "twinkle"A star is a gigantic ball of plasma, or gas, that uses its own gravity to stay togetherShe discovered over 2,400 variable stars altogetherWhen a star is small and bright it is in its hottest state, but when it's larger and dimmer, it's in its cooler stateLeavitt studied images, from Peru, of Magellanic Clouds but never actually viewed them in personThe Magellanic Clouds that Leavitt studied are 160,000 and 200,000 light years away, or roughly 940 quadrillion milesThe sun prevents us from seeing other stars during the day because the light it emits is greater than than that of the distant starsLeavitt discovered the "Standard Candle" and how it applies to measuring a star's distanceA Cepheid variable is a star whose brightness fluctuates over timeEdwin Hubble applied Leavitt's "Standard Candle" to his observations of the universeThe sun is the closest star to EarthAn apparent magnitude is the brightness of a star as viewed from EarthMagellanic Clouds are small galaxies outside of the Milky WayOptic luminosity is the rate at which a star emits light energy from its surfaceLeavitt lived from 1868-1921A constellation is a group of stars that form a shape or pictureA standard candle's luminosity is used to measure a distance of a star from EarthLeavitt lost most of her hearing due to an illness after she graduated collegeAt the time of her death, her discoveries were not widely knownShe attended Radcliffe College in MassachusettsBefore Henrietta's "Standard Candle", astronomers were only able to measure the distance of 60 starsHenrietta worked at Harvard Observatory for most of her life, studying the starsOn a clear night, you can observe up to 2,500 starsLeavitt discovered 1,777 variable stars outside of the Milky WayA variable star expands and contracts regularly, causing it to "twinkle"A star is a gigantic ball of plasma, or gas, that uses its own gravity to stay togetherShe discovered over 2,400 variable stars altogetherWhen a star is small and bright it is in its hottest state, but when it's larger and dimmer, it's in its cooler stateLeavitt studied images, from Peru, of Magellanic Clouds but never actually viewed them in personThe Magellanic Clouds that Leavitt studied are 160,000 and 200,000 light years away, or roughly 940 quadrillion milesThe sun prevents us from seeing other stars during the day because the light it emits is greater than than that of the distant starsLeavitt discovered the "Standard Candle" and how it applies to measuring a star's distanceA Cepheid variable is a star whose brightness fluctuates over timeEdwin Hubble applied Leavitt's "Standard Candle" to his observations of the universeThe sun is the closest star to EarthAn apparent magnitude is the brightness of a star as viewed from EarthMagellanic Clouds are small galaxies outside of the Milky WayOptic luminosity is the rate at which a star emits light energy from its surfaceLeavitt lived from 1868-1921A constellation is a group of stars that form a shape or pictureA standard candle's luminosity is used to measure a distance of a star from EarthLeavitt lost most of her hearing due to an illness after she graduated collegeAt the time of her death, her discoveries were not widely knownShe attended Radcliffe College in MassachusettsBefore Henrietta's "Standard Candle", astronomers were only able to measure the distance of 60 starsHenrietta worked at Harvard Observatory for most of her life, studying the starsOn a clear night, you can observe up to 2,500 starsLeavitt discovered 1,777 variable stars outside of the Milky Way

Henrietta Leavitt - Call List

(Print) Use this randomly generated list as your call list when playing the game. Place some kind of mark (like an X, a checkmark, a dot, tally mark, etc) on each cell as you announce it, to keep track. You can also cut out each item, place them in a bag and pull words from the bag.


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  1. B-A variable star expands and contracts regularly, causing it to "twinkle"
  2. B-A star is a gigantic ball of plasma, or gas, that uses its own gravity to stay together
  3. O-She discovered over 2,400 variable stars altogether
  4. I-When a star is small and bright it is in its hottest state, but when it's larger and dimmer, it's in its cooler state
  5. B-Leavitt studied images, from Peru, of Magellanic Clouds but never actually viewed them in person
  6. O-The Magellanic Clouds that Leavitt studied are 160,000 and 200,000 light years away, or roughly 940 quadrillion miles
  7. G-The sun prevents us from seeing other stars during the day because the light it emits is greater than than that of the distant stars
  8. G-Leavitt discovered the "Standard Candle" and how it applies to measuring a star's distance
  9. G-A Cepheid variable is a star whose brightness fluctuates over time
  10. I-Edwin Hubble applied Leavitt's "Standard Candle" to his observations of the universe
  11. N-The sun is the closest star to Earth
  12. I-An apparent magnitude is the brightness of a star as viewed from Earth
  13. O-Magellanic Clouds are small galaxies outside of the Milky Way
  14. O-Optic luminosity is the rate at which a star emits light energy from its surface
  15. B-Leavitt lived from 1868-1921
  16. N-A constellation is a group of stars that form a shape or picture
  17. B-A standard candle's luminosity is used to measure a distance of a star from Earth
  18. G-Leavitt lost most of her hearing due to an illness after she graduated college
  19. G-At the time of her death, her discoveries were not widely known
  20. I-She attended Radcliffe College in Massachusetts
  21. I-Before Henrietta's "Standard Candle", astronomers were only able to measure the distance of 60 stars
  22. N-Henrietta worked at Harvard Observatory for most of her life, studying the stars
  23. N-On a clear night, you can observe up to 2,500 stars
  24. O-Leavitt discovered 1,777 variable stars outside of the Milky Way