Why does space appear black to an observer looking away from a star?

Answer

Absence of atmosphere to scatter light.

The appearance of blackness locally in space is fundamentally attributed to the absence of an atmosphere that could scatter sunlight in all directions, unlike on Earth.

Why does space appear black to an observer looking away from a star?

#Videos

Is the colour in space images "real"? - YouTube

Spaceastronomyuniversecolor