Across
- 3. Measure of reflectivity
- 9. First to propose a hypothesis resembling the Big Bang
- 10. Important boundary in protoplanetary disk (two words)
- 11. Milky Way spiral galaxy type, specifically
- 13. Liquid that once existed on Mars
- 14. Cosmic measuring stick (two words)
- 15. All space and matter that exists
- 17. First astronomer to measure galaxy redshifts
- 18. Stars, ordered by spectral type from hot to cold
- 21. Most abundant element by mass in the Earth (abbrev.)
- 22. Comet feature, when close to Sun
- 24. Breakfast food analogy for the Milky Way (two words)
- 26. Type of galaxy without arms or disk
- 28. Planet with highest surface temperature
- 30. The stars near the Sun (abbrev.)
- 32. Discovered that most spiral galaxies contain dark matter
- 33. Large explosion; two main types
- 34. Energy creating process in star’s core
- 36. Ring forming "limit"
- 38. Jupiter, Saturn, Uranus, etc.
- 39. Processes resulting from internal heat
- 40. "Mini-eclipse" used to find exoplanets
- 43. Comet feature, when close to Sun
- 45. All the Jovian planets have them!
- 46. Substance that makes Neptune & Uranus blue
- 51. Early 20th century astronomer (and now a space telescope)
- 53. Mass of stars that form black holes
- 55. An object whose escape velocity exceeds the speed of light (two words)
- 58. Old type of star cluster
- 60. Features formed by liquid water
- 61. Most common type of matter and energy in universe
- 62. Theory for origin of our Solar System (abbrev.)
- 64. Most volcanically active object in our Solar System
- 65. Our star
- 66. Unit of pressure (abbrev.)
- 67. Only moon with thick atmosphere
- 68. Home to most of Milky Way’s stars, gas, and dust
- 70. The Milky Way, for example
- 72. Technique used to measure distance
- 73. Temperature-indicating absorption lines
Down
- 1. State of early Earth
- 2. Dwarf “star” that’s no longer a star
- 4. Unstable (in certain circumstances…) cloud (abbrev.)
- 5. Asteroid or Kuiper
- 6. Expanding universe "smoking gun"
- 7. Property that determines how long a star lives
- 8. Determined important period/luminosity relationship
- 12. Discoverer of elemental abundances in stars (two words)
- 16. Young type of star cluster
- 19. “Clumping” process that formed planetesimals
- 20. The Sun…billions of years from now (two words)
- 23. Comets have them, most asteroids don't
- 25. Caused by a meteoroid entering our atmosphere
- 27. Layer we live on
- 29. First planet discovered with a telescope
- 31. Famous diagram, for short
- 35. Key property of main sequence stars
- 37. Planet with most known moons (as of 5/2023)
- 41. State of matter in white dwarfs
- 42. Stellar property determined by luminosity and distance (abbrev.)
- 43. Useful variable stars
- 44. Avg. distance between Earth and Sun (abbrev.)
- 47. Form of hydrogen deep inside Jupiter and Saturn
- 48. A tested scientific idea supported by lots of evidence and observations
- 49. Former planet
- 50. Baby picture of the universe (abbrev.)
- 52. Two stars in orbit around a common center of mass
- 54. Home to the Milky Way’s globular star clusters
- 56. Galaxy we (the Milky Way) are headed toward
- 57. In main sequence stars, the product of fusion
- 59. Not an explosion, but rather an expansion (two words)
- 63. Home to CH4 lakes and seas
- 69. Large sphere of hydrogen undergoing fusion
- 71. What make the Milky Way a spiral galaxy