Add Yahoo as a preferred source to see more of our stories on Google. Guests visting the Lowell Observatory in Flagstaff, Arizona during the I Heart Pluto Festival gaze at celestial objects from the ...

Pluto, once considered the ninth planet of our solar system, has been a topic of intrigue since its reclassification as a dwarf planet. Recent observations suggest that its atmosphere is expanding, ...

Pluto’s thin, blue haze glows in this image from NASA’s New Horizons spacecraft. Though the dwarf planet is just a faint speck through a telescope, opposition this month offers skywatchers their best ...

For no explainable practical reason, humans are enamored with – and even empathetic toward – specific inanimate objects. Our first car. A choice coffee mug. And for a particular subset of the ...

Think you can spot Pluto? On July 25, the famously elusive dwarf planet reaches opposition—its best and brightest moment of the year. That makes now the ideal time to try to catch a glimpse of it from ...