Over the past decade, researchers have been puzzling through Pluto’s mysteries. Meanwhile, the New Horizons probe heads for interstellar space.

Today in History for July 20: In 1576, English explorer Martin Frobisher discovered the bay off Baffin Island that now bears his name. He thought it was a passage dividing America from Asia.

Photos of military parade marking Army's 250th anniversary ... This hotel has been named best in the US — and one of the top 10 on the planet ...