JPL has a studio that has produced a few art+science pieces, including the exoplanet travel posters.
Its website is: https://www.jpl.nasa.gov/thestudio/. They've made a few pieces that are around the JPL campus, and some which have traveled. Some are described in this article: https://www.theguardian.com/science/2016/aug/07/nasa-secret-...
The POC is Dan Goods, who is a graduate of Art Center College of Design. The Deep Space Network sculpture described in the article is on his vimeo: https://vimeo.com/93420747
I found this: "NASA Langley Student Art Contest"
> https://artcontest.larc.nasa.gov/
This Flickr collection:
> https://www.flickr.com/photos/nasacommons/sets/7215763397791...
Of course this fictional space travel advertisements: "Exoplanet Exploration: Planets Beyond our Solar System"
> https://exoplanets.nasa.gov/alien-worlds/exoplanet-travel-bu...