This site provided an article on the Valkyrie antimatter propulsion spaceship design which was used in Avatar. The article also had a video tutorial on antimatter and a NASA paper on scaling up antimatter production.
This site also supplied the article on What would it take to power a Yottawatt civilization ? Nuclear fission, nuclear fusion or space based solar. How long would each last ?
This looks at the new approach to space that is happening with the budgetary shifts.