How Big Is Pluto? New Horizons Settles Decades-Long Debate

With less than 24 hours to go before closest approach, NASA’s New Horizons spacecraft is seeing Pluto at a level of detail that grows sharper literally by the minute — not surprising when you consider that it is closing in on its target at nearly 31,000 miles per hour.

Late Monday morning, members of the mission science team held a news briefing at the Johns Hopkins University Applies Physics Lab in Laurel, Maryland, site of mission operations. Principal Investigator Alan Stern broke some

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