Exoplanet

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Across
  1. 3. – Large planets made mostly of hydrogen and helium
  2. 5. – A method where scientists take pictures of exoplanets
  3. 7. – Planets larger than Earth but smaller than Neptune
  4. 8. – A unit used to measure very large distances in space
  5. 9. – A way scientists find planets by measuring dips in starlight
  6. 12. – The region around a star where liquid water may exist
  7. 15. – A gas scientists look for as a possible sign of life
  8. 16. – A planet that orbits a star outside our solar syMilky WayKYWAY – The galaxy that contains our solar system
  9. 18. – A tool scientists use to study distant stars and planets
  10. 19. – Planets made mostly of solid material like Earth
Down
  1. 1. – A substance needed for all known life
  2. 2. – Smaller versions of Neptune with thick gas layers
  3. 4. – Another name for the habitable zone (not too hot or cold)
  4. 6. – A method that detects a star’s wobble caused by a planet
  5. 10. – A gas that may indicate biological activity
  6. 11. – Everything that exists, including all galaxies and planets
  7. 13. – A layer of gases surrounding a planet
  8. 14. – A space telescope that discovered thousands of exoplanets
  9. 17. – Gas giants that orbit very close to their stars