Would the solar corona be visible from the distance of the outer planets? If the photosphere was blocked, before the sun rises on an airless moon in the outer solar system, would either the inner or outer corona be visible to the naked eye?
If the sun is ever perfectly eclipsed as it is on Earth, then yes, the corona would be visible. The only reason we can't usually see the corona is because it is way dimmer than the rest of the sun. If the entire sun other than the corona is ever covered fully by another object, then the corona will be visible.