That 'bright spot' in the visor is the astronaut taking the photo. It gives you an idea of how much glare there actually is and it's that glare that provides all the 'fill' you could want.

The exposure is set for the ground, otherwise the glare from the moon would be blinding. ...although you capture ground and shadow detail, the cost of 'exposing for the moon surface' means you lose any stars that might have been in view.

regards
prixat