space term crossword

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Across
  1. 4. Light travels through a vacuum at 186,000 miles per second or 300,000 km per second.
  2. 6. Is a combination of lenses made of different glass.
  3. 7. Something visible without the aid of binoculars or a telescope.
  4. 10. Instrument to measure total energy or power from an object in the form of radiation.
  5. 11. Curved path, usually elliptical in shape, an object follows around a bigger object or a common centre of mass
  6. 12. Is the science that deals with the material universe beyond the earth's atmosphere.
Down
  1. 1. Fundamental unit of matter consisting of fixed number of protons.
  2. 2. Type of light with the longest wavelength with the least energy.
  3. 3. A measure of the total amount of matter within an object.
  4. 4. Galaxy going through a high rate of star formation
  5. 5. The distance light travels in one year, equivalent to approximately 5.9 trillion miles (9.5 trillion KM)
  6. 8. Negatively charged elementary particle found outside, but is attached to the nucleus of an atom.
  7. 9. A very bright meteor.