Pluto, once considered the ninth planet, lies over 6 billion kilometers from Earth, making it one of the most difficult ...

Federal funding is about to run out for 19 active space missions studying Earth's climate, exploring the Solar System, and probing mysteries of the Universe.

On Episode 176 of This Week In Space, Rod Pyle and Tariq Malik are joined by Alan Stern to talk about what is next in deep ...

Experience the 2015 astronomical sensation as New Horizons became the first human-made probe to reach Pluto, unveiling the mysteries of the distant ice dwarf. Discover newfound wonders from its ...

Preface: Inside the farthest exploration in history -- Introduction: Out of lock -- Dreams of a grand tour -- The Pluto underground -- Ten years in the wilderness -- The undead -- New Horizons at last ...

Twenty-Seven Years and Three Billion Miles -- A New Planet -- Gaps -- "With the Tip of a Pen" -- Post-Discovery Controversies -- The Search for Planet X -- Clyde's Planet -- Planetary Astronomy -- ...

Ohio State University engineers are developing a centrifugal nuclear thermal rocket, promising to double engine efficiency ...