My contribution was my article on carbon nanotubes with gold surrounded by lithium hydride being able to convert radiation to electricity 20 times better than old RTGs This will provide better space power in about ten years.
Centauri dreams article on Dyson spheres and aliens is part of CoS 49 as well. This was a follow up to one of my articles and some SETI search for Dyson Spheres.
Growing plants on the Moon
Not part of Carnival of Space week 49, but two excellent articles on fuel depots from Selenian Boondocks here and presentations on Space access 2008 Propellant Depot Panel.