Words describing the coming landing of the Rosetta spacecraft landing on the Chury comet.Scientists think it is partly icy & gassy.Where to land on an even surface.The comet is in two parts.One is icy & the other is gasssy.NASA is slowing down the spacecraft landing so, it's speed would be less than one meter per second. In general terms: the speed slower than a pedestrian movement per kilometer an hour.

Some of the puzzles that people list for the public get indexed by the search engines (like Google). Some people find those puzzles and cannot figure out how to make a puzzle of their own. So this page now has the navigation sidebar.

There are now buttons on the puzzle so that you can get a clean page, in either HTML or PDF, that you can use your browser's print button to print. The PDF format allows the web site to know how large a printer page is, and the fonts are scaled to fill the page. The PDF takes awhile to generate. Don't panic!