A grayscale image from the Mars Global Surveyor shows bright, snow- or frost-covered slopes on a Martian crater rim. These features, about 500 meters long, have persisted through the Martian spring and summer. The relatively sparse snow suggests high lift ticket prices for a Martian ski vacation – a humorous April Fool's Day image.
Astronomy Picture from 01/04/1999
Ski Mars!
Source: https://apod.nasa.gov/apod/ap990401.html
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