Wich are the differences of the spectra of H and He ionized?

Thread 'Atmosphere on moons'

Why don't other large moons in our solar system have atmospheres like Titan?

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Thread 'Is space stretching or is new space being created?'

Do we even know? My understanding of dark energy is that particles come into existence, exert and outward force, then vanish. My problem with that is how, of course, then how does dark energy know to push everything in the same direction? The pressure exerted would be in all directions, even if the space was moving so why isn't stuff pushed all over the sky? Thanks - rev

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