Define radiation.
 Radiation is energy that travels and spreads out as it goes– visible light that comes from a lamp in your house and radio waves that come from a radio station are two types of electromagnetic radiation.
2. Give in order the types of radiation in the EM spectrum from lowest to highest energy. Other examples of EM radiation are radio,  microwaves,infrared and ultraviolet light, X-rays and gamma-rays.
3.Which types of EM radiation do stars emit?Â
Stars emit radiation across the entire electromagnetic spectrum, but most average stars peak in the visible and near-infrared range.
Other radiation given off by stars include ultraviolet, radio, xrays.
4. The EM spectrum are similar in that they are all waves, but they differ in one thing. Â In what way is a microwave different from a gamma wave?Â
The difference is that the range each wave can travel.
5. Not all EM radiation can reach us from space. Â Which types of EM radiation can reach us from space and which types cannot? Â Why is this the case?
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Electromagnetic radiation from space is unable to reach the surface of the Earth except at a very few wavelengths, such as the visible spectrum, radio frequencies, and some ultraviolet wavelengths. Astronomers can get above enough of the Earth’s atmosphere to observe at some infrared wavelengths from mountain tops or by flying their telescopes in an aircraft. Also because of the atmosphereÂ