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