'Star Trek' Star Robert Picardo -- My Marriage Went Supernova & Exploded

"Star Trek: Voyager" star Robert Picardo has had a pretty stellar career over the past few decades ... unfortunately the same can't be said for his marriage -- 'cause the actor just filed for divorce from his looong-time wife of almost 28 YEARS.

The 58-year-old actor -- who starred in "Star Trek" and "Stargate: Atlantis" -- filed for divorce from his wife, Linda Pawlik, in L.A. Superior Court Wednesday ... citing irreconcilable differences.

Picardo and Pawlik have two daughters together, but neither are minors. They tied the knot waaaaaay back in 1984.

Just think ... that's worth about 142 Kim K. marriages.