Visible light is only one part of the electromagnetic spectrum. Astronomers combine wavelengths because they reveal different matter and processes. Earth’s atmosphere blocks X-rays, gamma rays and much infrared. Some radio, visible and infrared bands can be observed from the ground. A false-colour image is a data display, not always the view our eyes would see. Safety: No radiation source is needed. Do not imitate the instrument jobs with household appliances. Stop: Stop at paper matching. Do not use ultraviolet lamps, X-ray devices, radio transmitters, or invisible-light experiments.

Materials: Paper; Pencil; Seven paper labels 1. Write seven labels from longest to shortest wavelength: radio, microwave, infrared, visible, ultraviolet, X-ray, gamma ray. Space them equally but write: order only, not a wavelength scale. 2. Copy these instrument-job cards: radio—map cold or warm neutral hydrogen through its 21 cm emission; microwave—measure the cosmic microwave background; infrared—look at forming stars through dusty clouds; visible—record star and galaxy shapes; ultraviolet—study hot young stars; X-ray—study very hot gas near compact objects; gamma ray—study pulsars and supernova remnants. 3. Match each job to its spectrum label. Put ground possible beside radio and visible. Put space needed for these cosmic signals beside X-ray and gamma ray. Put some bands blocked beside infrared and most blocked beside ultraviolet. 4. Write two telescope cards: Hubble—mainly visible, also ultraviolet and some near-infrared; Webb—infrared, useful for dusty star-forming regions and distant galaxies whose light has stretched to longer wavelengths. Draw an arrow from each to its strongest match. 5. Choose one object that could benefit from two wavelength views. Explain what each view would add without inventing a picture. Done: Finish seven ordered labels, seven matches, atmosphere notes and two telescope cards. Proof: Keep the matching chart and two-view explanation. Note which wavelength facts were read from cards. Stop: Stop at paper matching. Do not use ultraviolet lamps, X-ray devices, radio transmitters, or invisible-light experiments.