Here are some good educational videos about our Solar System that tie in really well with the Gr. 6 Science Curriculum.
National Geographic, 3min 20sec
not as flashy as the others, but really informative (and I think they used kilometers).
Discovery "Space School", 4 min 20 sec
http://videos.howstuffworks.com/science-channel/33309-space-school-the-solar-system-video.htm
nice to look at, informative, but gives units in miles so might be harder to relate to the scales if grew up using km.
Khan Academy, these are about 10 minutes each,
http://www.khanacademy.org/video/scale-of-earth-and--sun?playlist=Cosmology+and+Astronomy
http://www.khanacademy.org/video/scale-of-solar-system?playlist=Cosmology+and+Astronomy
Each one leads to another. The first 2 are most relevant to the curriculum, but I watched at least an hours worth of them and was pretty entertained. Even though he mispronounced a couple things and gets a little repetitive on how overwhelming the scale of things are, I still thought it was pretty good. He actually did convey the sense of vast scales pretty well.
Not really related to the curriculum, but very interesting:
http://www.ted.com/talks/lang/en/phil_plait_how_to_defend_earth_from_asteroids.html
Composition of Meteorites:
https://brite.co/education/space-rocks-the-mineral-composition-of-meteorites/
This was a student submission (Thanks Olivia!)
Solar System:
http://en.wikipedia.org/wiki/Solar_System
http://solarsystem.nasa.gov/planets/index.cfm
http://en.wikipedia.org/wiki/Solar_system_model
http://www.kidsastronomy.com/the_planets.htm
http://www.asc-csa.gc.ca/eng/youth-students/13-16/
http://www.exploremarsnow.org/
Interstellar:
http://en.wikipedia.org/wiki/List_of_nearest_stars
http://en.wikipedia.org/wiki/Proxima_Centauri
http://en.wikipedia.org/wiki/Alpha_centauri
http://en.wikipedia.org/wiki/Habitable_zone
http://en.wikipedia.org/wiki/Project_Daedalus
http://www.bisbos.com/rocketscience/spacecraft/daedalus/daedalus.html