Interesting astronomy topics?

Hi, I am an elective astronomy teacher for grades 6 and 8 at a middle school.

I need help with coming up with more interesting topics for lessons that I will teach in my class. I don't go into the content very much, as my class is considered more of a "special". Please let me know of interesting lesson topics I could use for the class. Here is a list of things I have done so far:
Difference between meteorite and asteroid
Animals sent to space
What would happen if the Earth stopped rotating
Hubble space telescope (REAL vs FAKE images of space)
What is Astronomy? (What do you know about it?)
Life on the ISS

i WOULD APPRECIATE ANY IDEAS! and AGAIN, my class is a SPECIAL for when students do not have gym. Plus the student population in my school is average to below grade level.

Thanks!