NASA links urban population with air pollution

Live in a large city like New York, London, Beijing or Mumbai, and you are likely exposed to more air pollution than people in smaller cities in surrounding areas. But exactly how a city's pollution relates to the size of its population has never been measured, until now.

Hubble explores the origins of modern galaxies

The Hubble Sequence classifies galaxies according to their morphology and star-forming activity, organising them into a cosmic zoo of spiral, elliptical, and irregular shapes with whirling arms, fuzzy haloes and bright central bulges. Two main types of galaxy are identified in this sequence: elliptical and spiral, with a third type, lenticular, settling somewhere between the two.

Spaceflight alters bacterial social networks

When astronauts launch into space, a microbial entourage follows. And the sheer number of these followers would give celebrities on Twitter a run for their money. The estimate is that normal, healthy adults have ten times as many microbial cells as human cells within their bodies; countless more populate the environment around us. Although invisible to the naked eye, microorganisms – some friend, some foe – are found practically everywhere.

Cosmic turbulences result in star and black hole formation

Just how stars and black holes in the Universe are able to form from rotating matter is one of the big questions of astrophysics. What we do know is that magnetic fields figure prominently into the picture.

Mysterious magnetar boasts one of strongest magnetic fields in Universe

Scientists using ESA’s XMM-Newton space telescope have discovered that a curious dead star has been hiding one of the strongest magnetic fields in the Universe all along, despite earlier suggestions of an unusually low magnetic field.

Two moons passing in the Martian night

The larger of the two moons of Mars, Phobos, passes directly in front of the other, Deimos, in a new series of sky-watching images from NASA's Mars rover Curiosity.

NASA tracks Chelyabinsk meteor plume

Atmospheric physicist Nick Gorkavyi missed witnessing an event of the century last winter when a meteor exploded over his hometown of Chelyabinsk, Russia. From Greenbelt, Md., however, NASA's Gorkavyi and colleagues witnessed a never-before-seen view of the atmospheric aftermath of the explosion.

Video: Dream Pacer spacecraft rolls through ground tests

Hours before the heat rose in the Mojave Desert of Southern California on Aug. 2 the Dream Chaser rolled out of a hangar at dawn as teams prepared to pull the flight vehicle through a series of 60 mph ground tow tests.

JPL, Masten testing spacecraft precision landing software

NASA's Mars Science Laboratory spacecraft inspired millions of people worldwide a year ago when its unprecedented "sky crane" landing system successfully landed the Curiosity rover in a crater on the red planet on Aug. 6, 2012 (Aug. 5, 2012, PDT).

NASA's Juno is now halfway to Jupiter

NASA's Juno spacecraft is now halfway to Jupiter. 

Swapping motion-sensing units around Mars

NASA's Mars Reconnaissance Orbiter is switching from one motion-sensing device to a duplicate unit onboard.

NASA wants to mine asteroids

Over the last hundred years, the human population has exploded from about 1.5 billion to more than seven billion, driving an ever-increasing demand for resources. To satisfy civilization's appetite, communities have expanded recycling efforts while mine operators must explore forbidding frontiers to seek out new deposits, opening mines miles underground or even at the bottom of the ocean.

Heliophysics nugget - mapping tons of meteoric dust in the sky

Heliophysics nuggets are a collection of early science results, new research techniques, and instrument updates that further our attempt to understand the sun and the dynamic space weather system that surrounds Earth.

If we landed on Europa, what would we want to know?

Most of what scientists know of Jupiter's moon Europa they have gleaned from a dozen or so close flybys from NASA's Voyager 2 spacecraft in 1979 and NASA's Galileo spacecraft in the mid-to-late 1990s.

NASA works on balloon-based telescope

Dr. Rinehart is hoping to change the way scientists study the stars. To do this he needs a group of interns…and one very large balloon.

NASA says Sun's magnetic field is about to flip

Something big is about to happen on the sun. According to measurements from NASA-supported observatories, the sun's vast magnetic field is about to flip.

Big ice may explain Mars’ double-layer craters

Geologists from Brown University have developed a promising new explanation for a mysterious type of crater on the surface on Mars.

Astronomers image lowest-mass exoplanet around a sun-like star

Using infrared data from the Subaru Telescope in Hawaii, an international team of astronomers has imaged a giant planet around the bright star GJ 504. Several times the mass of Jupiter and similar in size, the new world, dubbed GJ 504b, is the lowest-mass planet ever detected around a star like the sun using direct imaging techniques.

NASA showcases Ironman-like exoskeleton

Marvel Comic's fictional superhero, Ironman, uses a powered armor suit that allows him superhuman strength. While NASA's X1 robotic exoskeleton can't do what you see in the movies, the latest robotic, space technology, spinoff derived from NASA's Robonaut 2 project may someday help astronauts stay healthier in space with the added benefit of assisting paraplegics in walking here on Earth.

NASA's Curiosity rover nears first anniversary on Mars

NASA's Curiosity rover will mark one year on Mars next week and has already achieved its main science goal of revealing ancient Mars could have supported life. The mobile laboratory also is guiding designs for future planetary missions.