Universe: everything that exist.
telescope: a divice that collects light and make distance objects appear closer and larger.
refraction: the bending of waves as they go from one substances to another.
reflection: the bouncing of waves off a surface.
wavelength: the distance from one peak to the next on a wave.
frequency: the number of waves that pass through a point in a second.
electromagnetic spectrum: waves of light in order by wavelength.
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