article_snippet: will pluck a large boulder off an asteroid and sling an asteroid around .
article_snippet: Nasa plans to pick up a boulder from a large asteroid (shown) using a robotic ship .
article_snippet: Once a target boulder was selected, the probe would .
article_snippet: 13-foot (2- to 4 meter) wide boulder.
article_snippet: The captured boulder, which would remain attached to the . probe, would then be nudged into an orbit circling high around .
highlights_snippet: Nasa robot ship will pluck a large boulder off an asteroid .
  