<p>Jim Green, NASA Planetary Science Division director, center, and other New Horizons team members count down to the spacecraft's closest approach to Pluto, Tuesday at the Johns Hopkins University Applied Physics Laboratory in Laurel, Md. The moment of closest approach for the New Horizons spacecraft came at 7:49 a.m. EDT Tuesday, culminating an epic journey from planet Earth that spanned an incredible 3 billion miles and 9 1/2 years. </p>

July 15, 2015