Across
- 2. The middle layer of the sun's atmosphere.
- 4. A celestial object consisting of a nucleus of ice, rock and dust; when near the sun, a "tail" of gas and dust particles form pointing away from the sun.
- 6. A unit of measurement used to describe distances between celestial objects, equal to 3.26 light years.
- 8. A small, blue-white hot core of a dim star that is the leftover center of an old star.
- 9. A naturally occurring physical entity, association, or structure that exists outside of Earth's atmosphere that can be found in the observable universe; i.e. planets, moon, stars, asteroids, comets, etc.
- 12. Distance greater than 35,785 km above sea level in which some artificial satellites orbit Earth.
- 14. A natural phenomenon by which all things with mass or energy, including planets, stars, galaxies and even light, are attracted to (or gravitate toward) one another.
- 16. A dark area of gas on the sun's surface that is cooler than surrounding gases.
- 17. The scientific law that states that every object in the universe attracts every other object.
- 19. A flattened rotating disk of gas and dust grains surrounding a newly formed protostar or star in which, over time, collisions within the disk tends to lead to planet formation.
- 20. The distance that light travels in one year; about 9.5 trillion km or 5.8 trillion miles.
- 23. A huge cloud of gas that is created when the outer layers of a red giant star drift out into space.
- 24. A meteoroid that has entered Earth's atmosphere and produces a streak of light in the sky as it burns.
- 26. An object that is thrown, propelled, or launched and the only force acting upon it is gravity.
- 28. A satellite that orbits in the same direction around Earth and whose speed is equal to Earth's rotational period of 23 hours and 56 minutes.
- 30. An object that orbits a star, is large enough to have become rounded by its own gravity, and is large enough to dominate or impact those within its orbit.
- 31. The apparent change in position of an object when you look at it from different locations.
- 32. A sudden eruption of intense high-energy radiation from the sun's surface associated with magnetic disturbances on the sun's surface.
- 33. A reaction that occurs when lighter nuclei are forced together to produce heavier nuclei; typically occurs within stars.
- 34. A geosynchronous (rotational rate 23 hours and 56 minutes) high earth orbit (35,785 km) satellite whose rotational rate and height allows it to remain above the same spot on Earth's surface.
Down
- 1. Distance between 160 ‐ 2,000 km above sea level in which some artificial satellites orbit Earth.
- 3. The inner layer of the sun's atmosphere.
- 5. When there are no net flows of matter or energy to or away from a system and no net changes in the matter and energy in that system; in regards to stars it is the balance between gravity collapsing the star and nuclear fusion within the star holding it up.
- 7. Any object, natural or artificial, that orbits around another object in space.
- 10. A form of matter that does not give off electromagnetic radiation nor emits light at any known wavelength and is believed to make up 90 percent of the matter in the universe.
- 11. The outer layer of the sun's atmosphere.
- 13. The average distance between Earth and the Sun, about 150 million km often used in Solar System distance calculations.
- 15. Any of numerous small solid celestial bodies composed of rock and metal that move around the Sun (mainly between the orbits of Mars and Jupiter).
- 18. A very large star of high luminosity and low surface temperature; red giants are thought to occur in the latter stage of a star's life when no hydrogen remains in the core to fuel nuclear fusion.
- 21. Planets composed made mostly of rocks and metals, have solid surfaces, with atmospheres that range from very thick (on Venus) to very thin (on Mercury); the four smaller inner planets in the solar system-Mercury, Venus, Earth, and Mars.
- 22. A huge group of single stars, star systems, star clusters, dust, and gas bound together by gravitational attraction.
- 24. A meteoroid that impacts or reaches the Earth's surface without burning up completely.
- 25. A large cloud of dust and gas in space from which solar systems are formed.
- 27. The remnants of a comet, asteroid or planet that has broken free and is floating around at extremely high speeds in space.
- 29. A large planet that consists mostly of gases hydrogen and helium in a dense form; the four large outer planets in the solar system- Jupiter, Saturn, Uranus, and Neptune.