Without space ships? Without space?

The "Stargate" franchise absolutely had both space and space ships.

The parent dropped the "sg1" and is talk about the entire franchise, not just 1 show or movie in it.

Even with SG1, SG1 definitely also had plenty of space and space ships, can't remember from which season exactly but lots of episodes have the team spent stuck on ships in space.

Even the original Stargate movie had a space ship but space ships were never central to the concept itself.

You could do a similar show and not have space ships due to faster than light travel being impossible. (While in Stargate it is possible).

Dr Who is occasionally on space ships, there are energy weapons, alien creatures, etc. But these are incidental to the plot, and it isn't Space Opera.

Stargate Atlantis and Stargate Universe aren't "occasionally on space ships". That's fundamental to their entire plot.

From Wikipedia, though: "Space opera is a subgenre of science fiction[1] and science fantasy[2] that emphasizes epic outer space adventures set in a universe in which faster-than-light travel has become common."

Stargate, even without the 2 series above, absolutely fits that definition. Very little of SG1 takes place on Earth. It's absolutely about aliens and crossing distances faster than light, and the epic adventures and social interactions that result.

Edit: Also, there's pretty heavy discussion that Dr Who is space opera.

I can't accept that Wikipedia is an authoritative source, but existence of FTL is not the sole determinant. That would make 'The Lion, The Witch and The Wardrobe' space opera.

Space Opera is any true descendent of Van Vogt's "Voyage of the Space Beagle" or EE Doc Smith Lensman series, Horatio Hornblower but in space, etc.

It requires the space opera quality, not the soap opera style.

Star Trek is in, Star Gate (core, not including their Universe and Atlantis) just jumps around with the Star Gate. It's Sci-Fi but not space opera. Probably a budgetary constraint of episodic TV, but nonetheless.