The outer edge of the crescent is bright, but it gets greyer and dimmer towards the inside of the curve.
astronomy
le bord extérieur du croissant
La limite extérieure d'une partie visible en forme de croissant.
A Honeymoon in Space
A Honeymoon in Space is a 1901 novel by George Griffith. It was originally serialized in abridged form in Pearson's Magazine in 1900 under the title Stories of Other Worlds. The scientific romance story depicts a tour of the Solar System, a type of story that was in vogue at the time.