Outside the bubble

Zimmerman relates from Berardelli this hadith, from February.

We (currently) inhabit an interstellar bubble, carved out by some supernova or other, which we moved into. This tenuous space-atmosphere is rendered even more tenuous by our own Sun's heat. Outside the heliosphere is "interstellar space" - although our Sun still owns a gravitational Hill Sphere, until and unless Scholz HD 7977. Hence, irradiated Eris. We know "interstellar space" because the Voyager probes now sail past Eris, although the first of said probes is acting weird now.

Merav Opher and Abraham Loeb consider, what would our heliosphere look like if/when we were NOT in a bubble. They calculate that, at worst, the heliosphere might not even reach 1 AU. In which case, Earth is fully exposed to cosmic radiation. On the plus side maybe our inheritors can make Bussard work again . . .

I counter that Earth's surface is never exposed as long as the magnet is working. I find difficult to believe that any record on Earth records interstellar events, excepting maybe an extreme Carrington, to be sought in geologic time and not in archaeology.

This is, however, a concern for our future, should our sats stop working.