Across
- 2. popularized the apparrent paradox of why the night sky is not bright
- 4. the point directly overhead
- 8. two words; diameter of light shaft exiting an eyepiece
- 12. two words; average sun-earth distance
- 13. famous constellation. hunter.
- 14. huge, gravitationally bound cluster of stars, dust, gas
- 15. two words; ‘line of sight’ double stars
- 16. source of power in stars
- 17. such charges produce EM waves
- 18. the moon’s gravity causes these on earth
- 20. apparent backward motion
- 25. two words; northern lights
- 26. two words; our sun is here on the HR diagram
- 27. a point of infinite density and zero volume
- 30. apparent to-and-fro motion of the moon’s face
- 32. largest moon in the solar system
- 33. nodding motion
- 34. archer constellation
- 35. common name for M101
Down
- 1. zero line for longitude
- 3. two words; a black hole has this
- 5. two words; common end product of stellar evolution
- 6. came up with laws of planetary motion
- 7. also called ‘oligarchs’ because they controll their surroundings
- 9. a moon of mars
- 10. two words; final phase of Solar System’s formation
- 11. two words; this stripped away atmosphere of Mars
- 19. constellation. contains tarantula nebula.
- 21. north-south arc in the sky; the M in AM/PM
- 22. Greek astronomer. Measured the circumference of the Earth.
- 23. equation that estimates the number of extraterrestrial civilizations in the galaxy
- 24. greek astronomer who introduced magnitude
- 28. occurs in between solstices
- 29. caused by meteorites
- 31. saturn is famous for these