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/