Also after what i had already pointed out if you notice at 15:00 they get flown backwards and each hit a dome of some sort. So I wouldnt consider this space, more like an example of when babadi made his ship have the same qualities as a planet.
Please provide evidence to what your stating, I'm assuming its from the bardock movie where its shown they were fighting in the atomsphere, even if you try to dispute that the movie is considered non canon.
Also in the new Resurrection F movie, Golden Frieza destroys the planet, Because of Whis's magical powers everyone in his general vicinity survives.
Bulma cries because Vegeta has died, and Whis explains that Frieza is most likely still alive because his race can survive in a vaccum.
Clearly Vegeta died because he cannot survive in a vaccum. He was in his SSGSS form and could have easily survived a explosion from a exploding planet (if you dispute this then we can use this an example that SSGSS goku can be destroyed by a supernova type explosion)
Check out from 1:26:28 onwards
https://www.youtube.com/watch?v=WNfS9uijGKA