Spitzer telescope observes gas emission from Comet ISON

Astronomers using NASA's Spitzer Space Telescope have observed what most likely are strong carbon dioxide emissions from Comet ISON ahead of its anticipated pass through the inner solar system later this year.

NASA's Mars Rover Makes Longest One-Day Trek

NASA's Hubble shows link between stars' ages and their orbits

Astronomers using NASA's Hubble Space Telescope have determined the orbital motion of two distinct populations of stars in an ancient globular star cluster, offering proof they formed at different times and providing a rare look back into the Milky Way galaxy's early days.

NASA's interplanetary probes to snap images of Earth from space

Two NASA spacecraft, one studying the Saturn system, the other observing Mercury, are maneuvering into place to take pictures of Earth on July 19 and 20.

NASA's Curiosity Mars rover passes one kilometer mark

The latest drive by NASA's Curiosity Mars rover brought the total distance that the rover has driven on Mars to more than 1 kilometer. One kilometer is about 0.62 miles.

NASA Hubble locates new Neptune moon

NASA's Hubble Space Telescope has discovered a new moon orbiting the distant blue-green planet Neptune, the 14th known to be circling the giant planet.

The heart of space weather observed in action

Two NASA spacecraft have provided the most comprehensive movie ever of a mysterious process at the heart of all explosions on the sun: magnetic reconnection. Magnetic reconnection happens when magnetic field lines come together, break apart and then exchange partners, snapping into new positions and releasing a jolt of magnetic energy.

NASA study shows disks don't need planets to make patterns

Many young stars known to host planets also possess disks containing dust and icy grains, particles produced by collisions among asteroids and comets also orbiting the star. These debris disks often show sharply defined rings or spiral patterns, features that could signal the presence of orbiting planets.

NASA’s IBEX provides first view of the solar system’s tail

It has long been assumed that our solar system, like a comet, has a tail. Just as any object moving through another medium – for example, a meteor traveling through Earth’s atmosphere – causes the particles to form a stream trailing off behind it.

NASA’s polar robotic ranger passes first Greenland test

Defying 30 mph gusts and temperatures down to minus 22 F, NASA’s new polar rover recently demonstrated in Greenland that it could operate completely autonomously in one of Earth’s harshest environments.

Mars Rover Curiosity begins trek toward Mount Sharp

With drives on July 4 and July 7, NASA's Mars rover Curiosity has departed its last science target in the "Glenelg" area and commenced a many-month overland journey to the base of the mission's main destination, Mount Sharp.

NASA's Mars rover Opportunity passes half-way point to next destination

NASA's Mars Exploration Rover Opportunity has driven more than half of the distance needed to get from a site where it spent 22 months to its next destination.

Gas-giant exoplanets cling close to their parent stars

Finding extrasolar planets has become so commonplace that it seems astronomers merely have to look up and another world is discovered.

NASA's Voyager 1 explores final frontier of "solar bubble"

Data from Voyager 1, now more than 11 billion miles (18 billion kilometers) from the sun, suggest the spacecraft is closer to becoming the first human-made object to reach interstellar space.

Sounding rocket to study electric currents in atmosphere

Swirling through Earth’s upper atmosphere is a layer of charged particles called the ionosphere. Constantly on the move, currents through the ionosphere can be much more complicated than winds at lower altitudes, because the currents vary in concert with magnetic fields around Earth and solar activity.

Water and ice on the moon - a metamorphosis

Using data gathered by NASA's Lunar Reconnaissance Orbiter (LRO) mission, scientists believe they have solved a mystery from one of the solar system's coldest regions—a permanently shadowed crater on the moon.

A billion-pixel view from Mars

A billion-pixel view from the surface of Mars, from NASA's Mars rover Curiosity, offers armchair explorers a way to examine one part of the Red Planet in great detail.

Got any ideas about ducking asteroids? NASA wants to hear them

NASA has announced a "Grand Challenge" focused on finding all asteroid threats to human populations and knowing what to do about them.

Marks on Martian dunes may be tracks of dry-ice sleds

NASA research indicates hunks of frozen carbon dioxide - dry ice - may glide down some Martian sand dunes on cushions of gas similar to miniature hovercraft, plowing furrows as they go.

Video: These noctilucent clouds get an early start

Every summer, something strange and wonderful happens high above the north pole. Ice crystals begin to cling to the smoky remains of meteors, forming electric-blue clouds with tendrils that ripple hypnotically against the sunset sky.