Across
- 3. - Electromagnetic waves with wavelengths longer than infrared but shorter than radio waves.
- 6. - A form of electromagnetic radiation (EMR).
- 7. - any massive self-luminous celestial body of gas that shines by radiation derived from its internal energy sources.
- 8. - is a huge collection of gas, dust, and billions of stars and their solar systems, all held together by gravity.
Down
- 1. - the number of waves that pass a fixed place in a given amount of time.
- 2. - The quality of being luminosity emitting or reflecting light.
- 3. - a broad band of light that can be seen in the night sky and that is caused by the light of a very large number of faint stars.
- 4. - s an enormous cloud of dust and gas occupying the space between stars and acting as a nursery for new stars
- 5. - an ideal or hypothetical set of facts, principles, or circumstances.
- 6. - an invisible force that pulls objects toward each other.