The best global maps of Mars, the Moon and Venus resolve finer detail than the best global map of our own seabed. A look at why, and how fast the gap is closing. Here is a claim that sounds like an exaggeration and is not: the best global maps of Mars, the Moon and Venus resolve finer detail than the best global map of the floor of our own ocean. The other worlds have been surveyed from orbit down to a few hu... [4922 chars]