The Universe is continuously expanding, with new suns and planets. Do all the planets have a deity and how are these gods born are they the sons and daughter's of gods from other planets ?
We can’t keep creating gods for each planet or star that is born! So in short, there are no gods or goddesses for each and every planet.
But of course, we have the Navagrahas. These Navagrahas are nine gods:
They are praised in the following Shloka:
Ādityāya ća Somāya Mańgalāya Budhāya ća |
Guru Śukra Śani bhyasća Rāhave Ketave Namah ||
I worship Aditya (Surya) and Soma (Chandra), Mangala and Budha, Guru (Brihaspati), Shukra and Shani (Sanishwara), Rahu and Ketu.
And again as mentioned, there are no gods or goddesses for each and every planet. Actually, there are no other gods related to planets/heavenly bodies other than the Navagrahas.
It is interesting to note that these Navagrahas are composed of gods of heavenly bodies/phenomena that can be seen with the naked eye from Earth. This CAN explain why there is no god for Uranus and Neptune.