The latest Space theme from Lego is Galaxy Squad. Basically space cops versus space bugs. There's come cool designs involved.
"LEGO Galaxy Squad, a new space fantasy theme, allows builders 8 and up to role play as the hero team saves the galaxy from a swarm of alien insects. Each of the 10 models in the collection ($11.99-99.99) offers a split feature function, turning every large model into two separate vehicles with ease."