Photos: Delta 4-Heavy launch gallery

NASA’s New Horizons spacecraft fine-tuned its path toward Pluto on Tuesday, firing its rocket thrusters for 93 seconds to aim for a fleeting flyby of the distant dwarf planet July 14.

The New Horizons spacecraft has captured its last view of mysterious dark blotches strung across Pluto’s equator, and the spots will likely keep scientists guessing about their origin for decades to come.

It turns out Pluto’s distinct haze layer carries a bluish hue, and deposits of water ice poking out from the frozen world’s crust are covered in a red sheen, scientists said Thursday.