Before the Space Age the planets, moons and asterioids of our solar system were largely abodes of mystery. A few things were known, or thought to be known. From that scanty body of knowledge arose a rich sf literature in which these mysterious bodies acquired personalities, characters, which in some cases transcended the particular stories in which they figured. That is to say, conventional depictions became established, a kind of common stock for writers. The Burroughs Mars and the Brackett Mars - for example - though very different from one another, can both be seen as variations on one huge theme. Then came the real-life discoveries of the Space Age and I suggest that in literature a big mistake sprang from this. It was almost always decided that no more stories could or should be set in the old, disproved Solar System. I suggest that the Old Solar System (OSS) has acquired enough literary reality to persist. For example, those publishers who told Leigh Brackett that it was no good her writing any more Low Canal Mars stories were, I think, wrong. And what about the good old Twilight Belt of Mercury? Pity to let that go. Any reactions? Other themes for the thread: the extent of the OSS in literature. Anyone know of tales set on Uranus? (I am trying to write some myself and would do well to know.) Any tales set on the Moon in an ancient past, when it was inhabited? - (apart from Jack Williamson's classic, "The Moon Era").