These are scenarios which expand the Default Orbiter installation (well sort of). it's propose is to give a user more of a feel to roam around and inspire to learn more, additional info on the Space Shuttle Atlantis scenarios and more scenarios on the Dragonfly, Delta Glider & Shuttle-A
Note:
This addon places  new UMMU breathable places for Io & Titan, if you don't want them you can delete them but you will load a scenario and be in the middle of nowhere.
Require addons:
UMMU 2.0http://orbiter.dansteph.com/index.php
Credits:
Dansteph for his UMMU
and Martin for the fantastic Orbiter Spaceflight Simulator
Next Addon : A surface bace?