Astronomy is the investigation of the cosmos through observation of stars, planets, nebula, galaxies, and other celestial bodies. This science includes some of the oldest data available within the Terragen Sphere, as observations that were recorded more than thirteen thousand years before present. Observations are available that were made by the Muuh xenosophonts several million yeras ago, although some of these may be unreliable.

This science has many specialized subdivisions including astrogation , astrometry, astrophysics, cosmology, heliology (including stellar structure and evolution), galactic structure, gravity wave astronomy, high-energy sources like cosmic rays, the nature of the interstellar medium, neutrino astronomy, optical astronomy, planetology, radio astronomy, spectrography, virtual astronomy, and the study of distant objects like quasars.

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