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| Term | Definition |
|---|---|
| 42000 astronomical units | what is the diameter of the ring nebula |
| crab and vela | 2 pulsars which emit visible light and give regular pulses of radio waves |
| violet | what is the colour of the hottest light? |
| red | which is the cooolest light? |
| red and violet | which light has the largest and smallest wavelength? |
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