01 February 2006, 01:00 PM ET
The planet-sized object, catalogued as 2003 UB313, is by many accounts a planet. It is round and orbits the Sun. But because several other objects meet those criteria and also approach Pluto's size, astronomers have been wrangling over how to define the w
26 January 2006, 10:00 AM ET
NASA’s Pluto-bound New Horizons spacecraft now speeding through the Solar System is set to reach Jupiter on Feb. 28, 2007, but it will not be the first craft of its mission to reach the gas giant, mission officials said this week.
19 January 2006, 03:47 PM ET
NASA’s first probe bound for the planet Pluto and beyond rocketed toward the distant world Thursday after two days of delay due to weather.
18 January 2006, 02:49 PM ET
The planned launch of NASA’s first probe bound for Pluto has been delayed another day due to an early morning power outage at the spacecraft’s Maryland-based mission control center Wednesday.
17 January 2006, 04:28 PM ET
A NASA spacecraft destined for the planet Pluto must wait one more day after high winds prevented a Tuesday launch attempt from Florida’s Cape Canaveral Air Force Station.
17 January 2006, 06:43 AM ET
The first spacecraft ever aimed at the planet Pluto is hours away from launching into space on a nine-year mission to the distant, icy world.
15 January 2006, 05:02 PM ET
NASA’s first spacecraft aimed at the edge of our solar system is ready for its more than nine-year trek to the planet Pluto and beyond, mission managers said Sunday.
09 January 2006, 12:36 PM ET
CAPE CANAVERAL - About three dozen people assembled at the spaceport Saturday to protest this month's planned launch of a plutonium-powered space probe bound for Pluto.
06 January 2006, 03:42 PM ET
The Global Network Against Weapons & Nuclear Power in Space of Brunswick, Maine has called for a demonstration at Cape Canaveral Air Force Station in Florida on Jan. 7 to protest the launch of NASA's New Horizons Pluto mission.
04 January 2006, 01:00 PM ET
A new study provides the best estimate to date of the diameter and heft of Pluto’s moon Charon and suggests the satellite likely has no atmosphere.
03 January 2006, 06:29 AM ET
Earth-bound astronomers taking Pluto's temperature from nearly three billion miles away have confirmed suspicions that the planet is colder than it should be. It's thought that the planet’s lower temperature is the result of interactions between its icy s
30 December 2005, 06:47 AM ET
There is plenty to see, and SPACE.com provides an overview of the planets for the coming year.
23 December 2005, 08:45 AM ET
It is the first ever flight to Pluto and the first planetary flyby in decades, but for its lead scientist and one Englishwoman NASA’s New Horizon mission will mark a milestone for space exploration.
17 December 2005, 10:12 AM ET
The launch of NASA’s Pluto-bound New Horizons spacecraft is being delayed so engineers can perform precautionary boroscope inspections of the Atlas 5 rocket's first stage fuel tank.
12 December 2005, 06:41 AM ET
NASA's New Horizons spacecraft is being readied for a January liftoff to the outer reaches of the solar system. It will be humanity's first mission to Pluto and the Kuiper Belt—a vast and distant repository of the solar system's leftover building material
23 November 2005, 06:46 AM ET
BOULDER, Colorado – NASA’s New Horizons spacecraft is nearing a liftoff into the unknown. This first mission to Pluto and the Kuiper Belt—a distant district of ancient, icy, rocky objects on the solar system’s outer banks—is assured to transmit back to Ea
03 November 2005, 10:05 AM ET
Lockheed Martin technicians are replacing one of the solid-fuel boosters attached to the Atlas 5 rocket that will launch NASA's New Horizons spacecraft to Pluto because of damage the motor sustained during Hurricane Wilma.
31 October 2005, 01:01 PM ET
Two small moons have been discovered orbiting Pluto, bringing the planet's retinue of known satellites to three and leaving scientist to wonder how it could be.
25 October 2005, 10:18 AM ET
CAPE CANAVERAL - NASA's multibillion dollar space shuttle fleet, twin launch pads and other facilities Kennedy Space Center appear to have survived Hurricane Wilma without suffering major damage, officials said Monday.
24 October 2005, 12:03 PM ET
NASA’s Florida spaceport stood all but empty Monday, with only an emergency crew watching over space shuttles and planetary probes while winds from Hurricane Wilma howled outside.
26 September 2005, 05:22 PM ET
A spacecraft bound for Pluto has arrived at NASA’s Florida spaceport, bringing it one step closer in its journey toward the distant world.
01 September 2005, 07:15 AM ET
Engineers have completed a set of key shake and bake tests in readying NASA’s New Horizons spacecraft – critical steps to show that the craft is on track for launch in January of next year.
02 August 2005, 12:05 AM ET
With the discovery of a new world larger than Pluto, astronomers feel the need to define the term "planet." But can they agree on anything?
29 July 2005, 07:59 PM ET
In a landmark discovery, a new world is found.
26 July 2005, 06:18 AM ET
Rare occultation may reveal new information on Pluto’s moon Charon.
07 June 2005, 07:00 AM ET
Most television science fiction shows fling humans out to the vast reaches of the galaxy, but "Voyage to the Planets and Beyond" is content with exploring our own planetary backyard.
29 March 2005, 01:10 PM ET
CAPE CANAVERAL -- NASA is offering people a chance to comment tonight and Wednesday on a planned mission to Pluto that will carry nuclear fuel.
11 March 2005, 06:15 AM ET
The challenge highlights the difficulty professional astronomers faced many decades ago when trying to find the elusive world in the first place.
15 February 2005, 07:00 AM ET
Pluto was discovered 75 years ago this week, and astronomers still don't know what to make of the frigid rocky world.
07 February 2005, 08:22 PM ET
In two findings, researchers find setups of stars and planets that confound current theory and definition.
27 January 2005, 02:03 PM ET
Pluto might have been hit long ago by a virtual twin in a collision that created the ninth planet's moon Charon, according to a new computer simulation.
22 November 2004, 06:24 AM ET
A fabled tenth planet out beyond Neptune, often referred to as Planet X, hasn't been found despite years of searching. But astronomers involved in the hunt are beginning to speculate that something like Planet X will be discovered, along with Y and Z.
04 October 2004, 05:23 AM ET
WASHINGTON -- NASA is still targeting a January 2006 launch of the New Horizons Pluto probe after the U.S. Department of Energy (DOE) confirmed it can deliver most of the nuclear fuel the spacecraft will need for its 10-year mission. A post-mission encoun
09 October 2002, 01:25 PM ET
Astronomers today said Pluto is undergoing global warming in its thin atmosphere even as it moves farther from the Sun on its long, odd-shaped orbit.
02 February 2001, 03:30 PM ET
Astronomer Niel de Grasse Tyson, director of the Hayden Planetarium at the American Natural History Museum in New York, discusses the center’s advocacy for dropping Pluto’s planetary status.
21 July 1999, 05:42 PM ET
Astronomers using the Japanese Subaru Telescope on Hawaii have detected frozen ethane on the surface of Pluto.