A classic optics experiment, in space with asteroids and AGNs!
Radio observations of the diffracted shadow cast by an asteroid can be used to nail down its location and determine its size and shape.
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astronomy planet formation galaxies stellar evolution simulations habitability protoplanetary disks black holes transits astronomical methods solar system statistics cosmology planetary science stars galaxy evolution theory binary stars supernovae exoplanets astrophysics observations radio astronomy spectroscopy accretion instrumentation Kepler star formation AGN dark matter