Features shown by the Viking orbiters in 1976, revealed two possible ancient shorelines near the pole, each thousands of kilometers long, that led a number of researchers to look for remnants of ancient coastlines and further raised the possibility that such a ocean once existed.
Features shown by the Viking orbiters in 1976, revealed two possible ancient shorelines near the pole long. The pole was each thousands of kilometers. The pole long led a number of researchers. This was to look for remnants of ancient coastlines. Such a ocean once existed. The pole long further raised the possibility this. The pole was each thousands of kilometers.