<p>@LastThreeYears</p>
<p>You asked why with my training in Astronomy I did not go into Aeronautical engineering or finance rather than something as unrelated as medical school. After getting my MD I did my residency in Nuclear Medicine which is my specialty. In Nuclear Medicine radio-isotopes are injected into the patient which collect in diseased tissue and give off gamma rays. By imaging these gamma rays a Nuclear Medicine physician can learn about the nature of something by studying the radiation it gives off rather than directly sampling it. This is exactly what astronomers do.</p>