Teaching 7th Graders About Black Holes

[Reedeegi]

I'm giving a lecture on black holes to 7th graders... what are things that I should include? They're presupposed to have had Algebra 1 (Elementary, not Abstract Algebra ;)) and a good background in simple Newtonian physics (calculation of force, energy, weight, etc. along with very basic E&M). Any ideas?

 

[waht]

might want to check out Neil Tyson:

 

[robphy]

I think the spacetime diagram on page 207 of Geroch's "General Relativity from A to B"
http://books.google.com/books?id=UkxPpqHs0RkC&pg=PA207
would be useful.