When Caped Baldy went all out and stopped holding back, his serious punch clash with CF Garou released enough energy to create a massive void in outer space where those stars were there before.
Since those stars are at least light-years apart, the yield (and somehow even its diameter) of the blast from their combined attack would easily surpass solar system level, as the size of our solar system is far smaller than the distance between two stars.
Not this shit again
What they did is they blow away The
light from the stars. There are no stars between Earth and Jupiter.
"What happened to those two, were they repelled...?"
"It was a reaction from that energy and I have no idea how far they flew..."
The issue is that light travels at about 300'000 kilometres per second and the nearest star to Earth besides the Sun is Proxima Centauri, which is over forty trillion kilometres away.
That means it takes over four years for light from the nearest star outside our solar system just to reach Earth. The blast of energy caused by Saitama and Garou could reach halfway between Proxima Centauri and Earth, a ridiculous range of twenty trillion kilometres, and the light from Proxima Centauri wouldn't reach Earth again for over two years.
That makes it impossible to tell the actual scale of the attack until the void is filled back up by light from celestial objects beyond it reaching Earth again. For all we know the void is only there for five seconds, giving the energy blast a range of one and a half million kilometres, or it could have obliterated Proxima Centauri after all and it has a range of over forty trillion kilometres instead.
It's an unquantifiable feat.