"in" becomes within, "our" becomes our, "solar" becomes celestial, "system" becomes system.
Next sentence: "Radio waves are a form of electromagnetic radiation..." Here, "form", "electromagnetic", "radiation", "wavelengths", "longer", "visible light" are candidates. I should make sure the synonyms make sense in context. "Wavelengths" might become "frequencies", "wavenums", "radiowave lengths". radio and radar astronomy projects for beginners pdf
"Radar astronomy is often used to study objects in our solar system, such as planets and asteroids." "in" becomes within, "our" becomes our, "solar" becomes
First sentence: "Take online courses or tutorials to learn specific skills (e.g. programming, radio astronomy software)." "in" becomes within