Thursday, June 21, 2007

Mars Rover Update

Status (Spirit's solar panels got cleaned by the wind and power is up to more than 600 watts; it is still looking at rocks at Home Plate. Opportunity is on Cape Verde and observing Duck's Bay where it might drive into Victoria Crater):

No new pictures.

Friday, June 15, 2007

Thursday, June 14, 2007

Oceans on Mars

Confirmed! (well as confirmed as anything like this can be...)

Mars is tipsy.

Saturn's Moons are spewing material into space

Carolina Martinez 818-354-9382
Jet Propulsion Laboratory, Pasadena, Calif.

Monica Talevi +31-71-565-3223
European Space Agency, Noordwijk, Netherlands

Gill Ormrod +44-1793-442012
Science and Technology Facilities Council, London, England

Maria Martinez 210-522-3305
Southwest Research Institute, San Antonio

NEWS RELEASE: 2007-065 June 14, 2007

Cassini Finds Saturn Moons Are Active

Saturn's moons Tethys and Dione are flinging great streams of particles into space, according to data from the Cassini mission to Saturn. The discovery suggests the possibility of some sort of geological activity, perhaps even volcanic, on these icy worlds.

These results appear in this week's issue of the journal Nature. The Cassini mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency.

The particles were traced to the two moons because of the dramatic outward movement of electrically charged gas, which could be mapped back to the moons' orbits in the magnetic environment of Saturn. Known as plasma, the gas is composed of negatively charged electrons and positively charged ions, which are atoms with one or more electrons missing. Because they're charged, the electrons and ions can become trapped inside a magnetic field.

Saturn rotates in just 10 hours and 46 minutes. This sweeps the magnetic field and the trapped plasma through space. Just like a child on a fast-spinning merry-go-round, the trapped gas feels a force trying to throw it outwards, away from the center of rotation.

Soon after the Cassini spacecraft reached Saturn in June 2004, its instruments revealed that the planet's hurried rotation squashes the plasma into a disc, and that great fingers of gas are being thrown out into space from the disc's outer edges. Hotter, more tenuous plasma then rushes in to fill the gaps.

Now, Jim Burch, team member of the Cassini Plasma Spectrometer at the Southwest Research Institute, San Antonio, Texas, and his colleagues have made a careful study of these events using the instrument. They have found that the direction of the ejected electrons points back towards Tethys and Dione. "It establishes Tethys and Dione as important sources of plasma in Saturn's magnetosphere," said Burch.

Until this discovery, the only moons of Saturn known to be active worlds were Titan and Enceladus. "This new result seems to be a strong indication that there is activity on Tethys and Dione as well," said Andrew Coates from the Mullard Space Science Laboratory, University College London, co-author and member of the Cassini Plasma Spectrometer team.

Activity is a draw for planetary scientists, as it means that the planet has yet to become geologically dead or is perhaps being supplied with energy. The activity on Enceladus was detected first by Cassini's Dual Technique Magnetometer. This led the flight team to schedule a particularly close pass of Enceladus, which revealed a wealth of data about Enceladus' alien geysers - and spectacular pictures, too.

"The best results arise when we combine a variety of data sets to understand the observations," said Michele Dougherty, Imperial College, London, who is principal investigator of the magnetometer.

Future flybys of Dione and Tethys will allow the magnetometer team and the other instrument teams a close-up look at the moons. Before that happens, the teams have to go back and search for further signs of activity in the data already collected during the Tethys and Dione flybys of 2005.

In addition, having detected the electrons, they will try to determine the composition of the Tethys and Dione plasma using ion data.

More information on the Cassini mission is available at:, http://saturn.jpl.nasa.govand .

The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Cassini-Huygens mission for NASA's Science Mission Directorate, Washington. The Cassini orbiter was designed, developed and assembled at JPL. The Cassini Plasma Spectrometer team is based at the Southwest Research Institute in San Antonio. The magnetometer team is based at Imperial College in London, working with team members from the United States and several European countries.


More to learn about Titan

When Burt Rutan Talks

I listen!

Mars Rover Update

Status (Spirit is still looking at Home Plate Rocks; Opportunity is still driving back to Duck Bay along the rim of Victoria Crater where it will likely drive into the crater):

No new photos

Wednesday, June 13, 2007

Lunar Lander Challenge Update

Nine teams this year. Should be exciting.

Ode to the Mars Rovers

Not a dry eye in the house! :)

Orion could fly in 2013

Bring it on!

Hubble Repair Mission

September 2008. I'd like to get it done before Bush leaves office or else the next President may cancel it.

SOFIA Update

More tests. So far so good.

Mars Cave

Likely place to look for life.

Mars Rover Update

Good general article about what the rovers are doing and a little about the next Mars probe landing in May 2008.

Mercury Messenger Update

Tuesday, June 12, 2007

Monday, June 11, 2007