Great Comet of 1843: These warbly synth sounds set the tone nicely for a scene focused on twinkling stars. I also like that you used the lowest voice as a moving melody-like line which helps highlight the high register contrasted parts nicely.
SSTC2D J033038.2303212: This track has some emotional exploration that provides a sense of uncertainty. I like the creativity in your harmonic movement throughout. I feel that we are moving to new places which keeps it interesting. There are some tracks by Ratatat that I love that this track reminds me of!
Crab Nebula: Off the bat I notice the heavier and slower feel, but also there are some similarities with the previous track.This track makes this location seem like a less desired area that the characters must trudge through. This is an interesting interpretation of the Crab Nebula image.
Overall: These three tracks all provide three different examples of unseen realms that I think complement each other nicely. I really appreciate your harmonic adventurousness and felt engaged the whole time. Nice work overall and thank you for sharing!