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| Question | Answer |
| Band | part of the radio and microwave spectrum used for communication |
| Big Bang theory | the theory that the universe was created in a massive explosion (the Big Bang) and that the universe has been expanding ever since |
| Blue shift | decrease in the wavelength of electromagnetic waves emitted by a star or galaxy due to its motion towards us. the faster the speed of the star or galaxy, the greater the blue shift is |
| Cosmic Microwave Background Radiation | Electromagnetic radiation that has been travelling through space ever since it was created (as gamma radiation) shortly after the Big Bang |
| Doppler Effect | The change of wavelength (and frequency) of the waves from a moving source due to the motion of the source towards or away from the observer |
| Electromagnetic spectrum | a set of radiations that have different wavelengths and frequencies but all travel at the same speed in a vacuum |
| Electromagnetic wave | Electric and magnetic disturbance that transfers energy from one place to another. The spectrum of electromagnetic waves, in order of increasing wavelength is: gamma and x-rays, ultraviolet, visible light, infrared, microwaves and radio waves |
| Frequency | The number of wave crests passing a fixed point every second |
| Infrared radiation | Electromagnetic waves between visible light and microwaves in the electromagnetic spectrum |
| Microwave | part of the electromagnetic spectrum |
| Optical fibre | thin glass fibre used to send light signals along |
| Red Shift | increase in the wavelength of electromagnetic waves emitted by a star or galaxy due to its motion away from us. The faster the speed of the star or galaxy, the greater the red-shift is. |
| Radio wave | Longest wavelength of the electromagnetic spectrum |
| Visible light | the part of the electromagnetic spectrum that can be detected by the human eye |
| Wavelength | the distance from one wave crest to the next wave crest (along the waves) |
| Wave speed | speed of travel of a wave |
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