Because infrared telescopes use infrared aka anything above absolute zero (0 degrees Celsius or 32 degrees Fahrenheit) meaning that the telescope would not only pick up the stars but also all of the people and lights so on and so forth
Can you please elaborate? This is as your question isn't very clear.
Remember Ohm's law

. Plugging in the information gives you

amperes of current.
You have a specific number of words typed a minute and you need to know the science involved in making it