Links mentioned in the episode:

NASA 3D resources https://nasa3d.arc.nasa.gov/

The Celestia Motherlode http://www.celestiamotherlode.net/

ESO https://www.eso.org/public/

ESA/Hubble https://esahubble.org/

NOIRlab https://noirlab.edu/public/

NASA Science Visualization Studio https://svs.gsfc.nasa.gov

NASA Open Data Portal https://data.nasa.gov/

NASA Photojournal http://photojournal.jpl.nasa.gov

Planetary Data System https://pds.nasa.gov/

NOAA Science on a Sphere http://www.sos.noaa.gov/Datasets

USGS Apollo panoramas http://astrogeology.usgs.gov/maps/moon-apollo-landing-panoramas

The Gateway to Astronaut Photography of Earth http://eol.jsc.nasa.gov/

Database of Asteroid Models from Inversion Techniques (DAMIT) https://astro.troja.mff.cuni.cz/projects/damit/

OpenClipArt.org https://openclipart.org

OpenGameArt.org https://opengameart.org/

HDRI haven https://hdrihaven.com/

TextureHaven https://texturehaven.com/

3DModelHaven https://3dmodelhaven.com/