Space 01
How a dip in starlight reveals an exoplanet’s size
Infer a planet-to-star radius ratio from a transit light curve, compare Earth and Jupiter signals, and explore why grazing transits need more care.
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Physics 02
Reading motion in starlight: redshift, blueshift and spectral fingerprints
Measure a hydrogen line’s Doppler shift, distinguish fractional and absolute wavelength changes, and solve a synthetic mystery spectrum.