Who would win?
1,000,000,000,000 lions or 1 sun?

The sun. Every time.

If you were to be 100 yards away from the sun you’d be incinerated, already proving that the sun would win. But that’s not all. Lions live 5-10 years, and it would take 20 years for a rocket to travel to the sun. Even if we got the youngest ones they’d still die half way. But wait, there’s more. It would take forever to build a rocket large enough to house one trillion battle lions. It would take another forever to get enough fuel to travel to the sun. But wait, there’s even more. A sphere of a trillion lions has the mass of 190×1012 kg, the sun has the mass of 1.989×10^30 kg. A ball of lions compared to the sun is an atom compared to a human. Also, I don’t think they make spacesuits for lions.