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/