Pluto Designated for Assignment

After nine days, astronomers finally decided that eight is enough:

Leading astronomers declared Thursday that Pluto is no longer a planet under historic new guidelines that downsize the solar system from nine planets to eight.

Pluto is now a "minor planet"; and not even the largest one of those as what 2003 UB₃₁₃ gets that honor. Which, I suppose, makes the New Horizons probe the first NASA expedition to such a body (as opposed to being the last first-tome mission to one of the planets).