The Sloan Digital Sky Survey O searches to see whether extra-terrestrial civilizations are sending any digitally recorded music our way O searches for Trans-Neptunian objects, small icy bodies in the outer solar system, whose orbits sometimes resemble Pluto's takes images and spectra of millions of objects, to find the positions and redshifts of as many galaxies and quasars as possible O searches for planets around neighbor stars by looking for changing Doppler shifts in their spectra O searches for supernova remnants that could have pulsars inside and then try to find the pulsars

The Sloan Digital Sky Survey O searches to see whether extra-terrestrial civilizations are sending any digitally recorded music our way O searches for Trans-Neptunian objects, small icy bodies in the outer solar system, whose orbits sometimes resemble Pluto's takes images and spectra of millions of objects, to find the positions and redshifts of as many galaxies and quasars as possible O searches for planets around neighbor stars by looking for changing Doppler shifts in their spectra O searches for supernova remnants that could have pulsars inside and then try to find the pulsars