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Dark energy force is accelerating the universe.

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Dark Energy Universe.
Dark Energy - the mysterious force that's accelerating the Universe.

Neutrino Mass Linked to Dark Energy.

Researchers from the University of Washington have developed a theory which links together Dark energy - the mysterious force that's accelerating the universe - with the recent discovery that neutrinos have mass. They believe the link comes from the interaction between neutrinos and undiscovered subatomic particles called "accelerons". Dark energy results when the universe tries to pull the neutrinos and accelerons apart. One interesting prediction from this theory is that the acceleration of the universe will slow down as the neutrinos get further apart.

Astronauts Prepare for Third Spacewalk.

Halfway through their 6-month mission, the crew of Expedition 9 are preparing for their third spacewalk outside the International Space Station. On August 3, Gennady Padalka and Mike Fincke will exit the station and install retroreflectors and communications equipment. This will be used by the European Space Agency's Automated Transfer Vehicle which will make its first flight next year to deliver supplies to the station.

Some of the Hazards in Space.

It's mostly empty, but space can still be a dangerous place for spacecraft. They're usually filled with delicate and sensitive scientific equipment, and the first major risk comes with launch. A typical rocket launch is so loud and violent that spacecraft can be shaken apart. Once in space, they need to deal with the temperature extremes, which can range hundreds of degrees above and below freezing. They're blasted by radiation from the Sun and cosmic rays which come from deep space. And the tiny dust in meteor showers can punch holes in the spacecraft because of their tremendous speed. Engineers need to account for all of these when designing them to survive.

Fractured Crater on Mars.

This perspective image of a fractured crater near the Valles Marineris was taken by the European Space Agency's Mars Express spacecraft during its 61st orbit in January, 2004. The image was obtained using its High Resolution Stereo Camera (HRSC), which enables scientists to build a realistic 3D model of the surface of Mars which can then be tilted and rotated to examine from different angles. scientists aren't sure why the floor of this crater is broken up like this, but it could be from cooled lava, dried clay, or frozen ground.

Cassini spacecraft Closer to Titan.

NASA's Cassini spacecraft took this image of Saturn's Moon Titan on July 2, 2004, when it was only 347,000 km (216,000 miles) away. This closer image and better resolution is an improvement over Cassini's previous images of the enshrouded Moon by a factor of four. It's a natural colour image, built by merging photographs taken through the spacecraft's red, blue and green filters.

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