Credits
The idea for Mission 5 and many of the particulars have been adapted from the 6th - 8th grade Spaceship Earth lessons published at http://sciencenetlinks.com/lessons/spaceship-earth/.
Image Credits
All photos not attributed here were found on Wikipedia Commons or NASA.
Headers:
Opening planet picture created by Spaceplatypus at Deviant Art
Water picture from Akenator at Deviant Art
Stars from thedaintyheart on Flickr
Constellations from nd-n(lambda) on Flickr
Alien landscape from Serendigity on Flickr
Exoplanet landscape from arhicks on Deviant Art
Barnyard animals from Cornell University
Image of Mallory Horton watering plants from the Michigan Municipal League's Flickr
Comparison of Sirius and Rigel found at ErikTonnsen.com
Gravity image found at TShirtGrove.com
Science Teacher Zone retrieved from Amazon
Image of 4 spheres found at Haikudeck.com