The Universe

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Across
  1. 6. A natural luminous celestial body of great mass which produces energy. They can be seen in the sky especially at night.
  2. 7. An object that orbits a star. Planets are made up of mostly rock or gas, with a small, solid core.
  3. 10. A neutron star that emits rapid and periodic pulses of radiation
  4. 11. Matter that does not emit, reflect, refract, or absorb light.
  5. 12. The theory for the origin and evolution of our universe. (The explosion of hot and dense state that spread across space, creating time, matter, energy, light etc..
  6. 14. A planet that orbits a star other than the sun.
  7. 17. A ball of rock and ice, they usually orbit the sun in paths that allow them to pass by the Sun only once or that repeatedly bring them through the solar system.
  8. 20. Smaller celestial bodies that orbit around larger celestial bodies. (e.g. moons around planets, small galaxies around large galaxies)
  9. 22. A binary star system (consisting of a white dwarf and a companion star) that rapidly brightens, then slowly fades back to normal.
  10. 23. The brightest type of active galactic nucleus, believed to be powered by a supermassive place hole.
  11. 24. A large body orbiting a planet
Down
  1. 1. The hot core of a star that has exhausted its nuclear fuel and expelled its outer layers, forming a planetary nebula. Over billions of years they gradually cool, eventually becoming black dwarfs.
  2. 2. A celestial body within the Solar System that shares the characteristics of planets. It orbits the sun, is not a moon, and has a spherical or an early spherical shape. Unlike a planet, however, a dwarf planet has not cleared away any loose cosmic rubble from its orbit.
  3. 3. Rocks floating around in space.
  4. 4. A geometric pattern of bright stars that appears grouped in the sky.
  5. 5. The explosive death of a massive star whose energy output causes its expanding gases to glow brightly for weeks or months.
  6. 8. A large planet with a small, rocky core and a deep atmosphere composed mostly of hydrogen and helium.
  7. 9. A bright streak of light in the sky is caused when a meteoroid enters the Earth’s atmosphere. The streak of light is produced from heat generated by the meteoroid traveling into the earth’s atmosphere.
  8. 13. A region of space containing a huge amount of compacted mass in a small volume. Black holes have such a great gravitational influence, not even light can escape it.
  9. 15. A spiral galaxy that is the home of Earth.
  10. 16. A cloud of gas and dust located between stars and/or surrounding stars. Nebulae are often places where stars form.
  11. 18. Matter made up of particles that have the same mass as normal matter, but have opposite properties, like electric charge
  12. 19. A collection of stars, gas, and dust bound together by gravity.
  13. 21. The Sun and its surrounding matter, including asteroids, comets, planets, and moons held together by the Sun’s gravitational influence.