Across
- 2. is the cloud of dust and gas that boils off the nucleus as the comet's orbit takes it closer and closer to the Sun
- 4. a celestial event in which a number of meteors are observed to radiate, or originate, from one point in the night sky.
- 6. or National Aeronautics and Space Administration
- 9. a celestial object consisting of a nucleus of ice and dust and, when near the sun, a “tail” of gas and dust particles pointing away from the sun.
- 11. is a spherical layer of icy objects surrounding our Sun
- 12. or Near-Earth Objects are comets and asteroids that have been nudged by the gravitational attraction of nearby planets into orbits that allow them to enter the Earth's neighborhood.
- 14. a small body of matter from outer space that enters the earth's atmosphere, becoming incandescent as a result of friction and appearing as a streak of light.
- 16. are rocky worlds revolving around the sun that are too small to be called planets. They are also known as planetoids or minor planets
- 19. Comets orbit around the Sun in a
- 20. it is where meteors can be found
Down
- 1. or space observatory is a telescope located in outer space to observe distant planets, galaxies and other astronomical objects
- 3. a region of the solar system beyond the orbit of Neptune
- 5. intellectual and practical activity encompassing the systematic study of the structure and behaviour of the physical and natural world through observation and experiment
- 7. is a scientist in the field of astronomy. They observe astronomical objects such as stars, planets, moons, comets and galaxies.
- 8. located roughly between the orbits of the planets Jupiter and Mars
- 10. is a solid piece of debris from an object, such as a comet, asteroid, or meteoroid, that originates in outer space and survives its passage through the atmosphere to reach the surface of a planet or moon
- 13. is the gravitationally bound system of the Sun and the objects that orbit it,
- 15. the physical universe beyond the earth's atmosphere.
- 17. is the solid, central part of a comet
- 18. a small body moving in the solar system that would become a meteor if it entered the earth's atmosphere.