NASA trims list of sites to land on Mars to 4

Team in charge of mission will soon suggest best location

LOS ANGELES - After years of poring through images from space and debating where on Mars the next NASA rover should land, it comes down to four choices.

Scientists in the close-knit Mars research community get one last chance to make their case this week when they gather before the "judges" - the team running the $2.5 billion mission that will soon suggest a landing site to NASA, the ultimate decider.