Optical telescope issues visible light emitted by a star to make it appear closer. Radio, Ultra Violet and infrared telescope issues the wavelength of light.
I am not 100% sure but I believe that because of increased manufacturing, the air got very polluted and this made many trees darker, like birch. So moths are usually lighter in color so many couldn’t really hide among trees and they were eaten. After some time, many moths mutated and also became darker to blend in when they were on trees to prevent being eaten by predators. In conclusion, the population decreased.
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It circulates the air using a fan. A regular oven merely surrounds the food with hot air. The heat is distributed differently.
Hope that helped you.
