Across
- 1. how bright a star actually is as measured from a fixed distance
- 6. a galaxy with no defined, recognizable shape; contains mostly young stars
- 8. a galaxy shaped like a round or flattened ball, generally containing only old stars
- 9. the tide with the least difference between consecutive low and high tides, when the sun and moon pull at right angles
- 11. Small rocky planets with no rings and few moons (Mercury, Venus, Earth, Mars)
- 12. a 3-D spherical region that surrounds the solar system and contains billions of comets
- 15. layer of the sun where hot gas moves up toward the surface and cooler gas moves deeper into the interior
- 16. a diagonal area on an H-R diagram that includes more than 90 percent of all stars
- 18. term pertaining to the period during which the visible surface of the moon decreases
- 20. the outer layer of the sun's atmosphere.
- 22. A ball of frozen dust and rock that orbits the sun and has a tail that glows
- 23. the central part of the sun where nuclear fusion occurs
- 25. A streak of light in the sky produced by the burning of a space rock in Earth's atmosphere.
- 26. the distance light travels in one year; used as a unit of measurement of the distance between stars
- 28. a sudden eruption of intense high-energy radiation from the sun's surface
- 29. the continuous flow of charged particles from the sun
- 31. a collection of stars, dust, and gas bound together by gravity
- 33. a star and all of the planets and other objects that revolve around it
- 35. a loop of gas that protrudes from the sun's surface, linking sunspot regions
- 36. a graph organizing stars by their temperature and brightness
- 37. color of the coolest/lowest-temperature stars
- 39. A space rock that passes through the atmosphere and hits Earth's surface.
Down
- 2. space and all the matter and energy in it
- 3. the layer of the sun's interior where energy is transferred outward from the core
- 4. color of the hottest/highest-temperature stars
- 5. Either of the two times of the year when the sun is at its greatest distance from the celestial equator and one hemisphere receives its shortest days; about June 21 and December 21
- 7. term pertaining to the period during which the visible surface of the moon increases
- 10. how bright as star appears as seen from Earth
- 13. a dark area of the photosphere of the sun that is cooler than the surrounding areas and that has a strong magnetic field
- 14. The tide with the greatest difference between consecutive low and high tides, when the sun and moon are parallel
- 17. the visible surface of the sun
- 19. Moon phase at which the Moon cannot be seen because its lighted half is facing away from Earth.
- 21. A 2-D region of the solar system that is just beyond the orbit of Neptune and that contains many small bodies
- 24. Large gas giant planets with many moons and rings (Jupiter, Saturn, Uranus, Neptune)
- 27. Unit the average distance between the Earth and the Sun; used as a unit of measurement inside the Solar System
- 28. a galaxy in which the stars and gas clouds are concentrated mainly in one or more spiral arms
- 30. Either of the two times of the year when the sun is at the celestial equator and both hemisphere receive equal days; about March 21 and September 21
- 32. Moon phase when the entire side facing Earth is illuminated.
- 34. A ball of hot gas, primarily hydrogen and helium, that undergoes nuclear fusion
- 35. a large body in space that orbits a star and does not produce light of its own
- 38. to move in a circular path around another object
- 40. to spin on an axis