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