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
Experiments. ...
Surveys. ...
Questionnaires. ...
Interviews. ...
Case studies. ...
Participant and non-participant observation. ...
Observational trials. ...
Studies using the Delphi method.
Answer:
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Explanation:
because if u upload it will not save .