Yes, the sky is black in all cases, unless there is no reflected light reaching the iris.
I asked Jack a question about his partial eva while returning back from the Moon and he could only see a thin Earth crescent (the Moon was bhind his back and his job was to check Ron's eva).
They could well see stars, but only when they applied an eye to a tube and aimed at one for navigation (a sextant of sorts). Even the light coming from inside the capsule (dashboard, etc) prevented them from seeing stars at the Moon's farside-darkside. It is entirely possible they turned all lights off while there also was no Sunlight nor Earthlight outside; then, if the windows were not too fogged up or scratched, they could have seen many stars.
If an astronaut were to perform an eva en route to Mars, he'd do it for a specific purpose and he'd never have the time to apply a tube on his helmet just to block any light from his iris.
Raoul
Space/Science » in reply to Black Sky?
Re: Both