Hi all. After five years, I finally found the time to update all of the educational activities for Celestia for 2017. They use Celestia 161-ED, a specialized version of Celestia 161 that includes sound and Lua Edu tools. The updates took a month to prepare and include additions of new spacecraft, edits of what spacecraft such as the Mercury Express, Curiosity, Cassini, Dawn, New Horizons and Juno have found on Mercury, Mars, Ceres, Jupiter, Saturn, Pluto and their moons, and revisions to hundreds of facts regarding the broader universe. The updates also now include answers to all of the questions posed in the student worksheets.
You can find the new updates on the educational page of motherlode, here: http://www.celestiamotherlode.net/catalog/educational.php
Be aware that to use the new files, it is best to save what you wish from older files, then uninstall Celestia 160-ED and reinstall Celestia 161-ED.
Special thanks to the great folks who did those new spacecraft addons, and to Selden Ball for his exhaustive help in testing out the new zip files, and to Ulrich Dickmann for his expertise in revising the webpage.
Enjoy. Post any comments you wish about the updates below.