Image: Frozen carbon monoxide in Pluto's 'heart'

Peering closely at the "heart of Pluto," in the western half of what mission scientists have informally named Tombaugh Regio  (Tombaugh Region), New Horizons' Ralph instrument revealed evidence of carbon monoxide ice.  

Ready for its close-up: First spacecraft to explore Pluto

NASA's New Horizons spacecraft was expected to get up-close and personal with Pluto on Tuesday, on track to zoom within 7,800 miles (12,500 kilometers) of the small icy world left unexplored until now.

Image: Pluto's 'halo' craters

Within Pluto's informally named Vega Terra region is a field of eye-catching craters that looks like a cluster of bright halos scattered across a dark landscape.

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