"-osphere" is, quite possibly, the most scientific morpheme in the English language. You've got a biosphere, geosphere, lithosphere, cryosphere, chromosphere, photosphere, rhizosphere, asthenosphere, inosophere, photosphere, even a noosphere. I don't know what all those words mean, but I'm sure that there has been at least one research grant awarded for the study of each of them. Because they're important (science says so).
And then you've got the blogosphere. It just sounds bloated.