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Let's review what we know about NASA's Martian secret heard round the solar system last week:

An NPR reporter happened to be recording in the office of the lead scientist for the Curiosity rover as some data from the rover's on-board chemistry lab was coming in. When pressed by the reporter to interpret the data, NASA's John Grotzinger declined, commenting simply that the "data is going to be one for the history books."… Read more

Forget Mars! NASA has discovered signs of video gaming on a moon of Saturn. Recently released images from the Cassini mission show features on the icy moon of Thethys that look suspiciously like a famous '80s arcade creation.

The Pac-Man image was discovered in thermal data provided by Cassini's composite infrared spectrometer. You can read up on the nifty high-energy electrons bombardment theory for the shape over at NASA. The findings were published in the journal Icarus.… Read more

Why don't we have warp drive yet? Well, because, according to "Star Trek" lore, inventor Zefram Cochrane hasn't been born yet.

Baby Zefram is due in about 20 years, but in the meantime NASA and the Department of Energy are working on something somewhat tantalizing if you're planning a deep-space probe.

Researchers including engineers from Los Alamos National Laboratory have demonstrated a nuclear reactor that could power spaceflight. It's nowhere near as powerful as NASA's conceptual antimatter engine--the Demonstration Using Flattop Fissions (DUFF) experiment produces just 24 watts of electricity. … Read more

Astronaut Scott Kelly and cosmonaut Mikhail Kornienko, both veterans of long-duration space flights, will spend a full year aboard the International Space Station to help scientists learn more about how the body reacts and adapts to weightlessness and other aspects of the space environment.

The research is aimed at helping scientists and engineers develop possible countermeasures for future manned missions to deep space destinations including the moon, nearby asteroids and, eventually, Mars.

"Congratulations to Scott and Mikhail on their selection for this important mission," William Gerstenmaier, NASA's associate administrator for space flight, said in a statement. "… Read more

It seems NASA and the Curiosity rover have found something exciting and nerd-tastic on Mars, but the space agency's scientists are holding back for now, despite how painful it appears to be for them.

NPR science correspondent Joe Palca happened to be in the room recently when John Grotzinger, lead scientist for the Curiosity mission at NASA, started receiving data on his computer from the rover's on-board chemistry lab, also known as SAM (sample analysis at Mars). SAM and NASA scientists on Earth have been busy analyzing a sample of Martian soil of late, and apparently the dirt from the Red Planet has a secret to tell.

"This data is going to be one for the history books, it's looking really good," Grotzinger said in the story that aired yesterday.

And that's about all he said.… Read more

Three veteran space station fliers strapped into their Soyuz ferry craft, undocked and plunged back to Earth today, making a fiery descent to a frigid pre-dawn landing in Kazakhstan to close out a 127-day stay in space.

With Soyuz commander Yuri Malenchenko strapped into the descent module's center seat, flanked on the left by outgoing Expedition 33 commander Sunita Williams and on the right by Japanese astronaut Akihiko Hoshide, the crew undocked from the station's Russian Rassvet module at 5:26 p.m. EST as the two spacecraft sailed 250 miles above northwestern China.

Two-and-a-half hours later, positioned … Read more

"Now, this is the plan. Get your ass to Mars."

We all remember Schwarzenegger motivating himself to go to the Red Planet in "Total Recall" (anyone bother watching the remake?) and sure we'd like to go too. Now NASA's Curiosity Mars rover has determined that radiation levels on the planet's surface are safe for human explorers.

"The astronauts can live in this environment," Don Hassler, principal investigator on Curiosity's Radiation Assessment Detector instrument (RAD), told a news conference.

"Basically, we're finding that the Mars atmosphere is acting as a shield for the radiation on the surface and as the atmosphere gets thicker, that provides more of a shield and therefore we see a dip in our radiation dose," Hassler said.

The findings mark the first time that cosmic rays have been measured on the surface of another planet, and come 100 years after Victor Hess discovered cosmic rays on Earth by using a hot-air balloon.… Read more

Buffeted by ethereal whirlwinds and twisters, the Curiosity Mars rover is wrapping up initial soil analysis operations at a sandy drift where it's been parked for more than a month, project scientists said today. The rover is now being prepared to move on in search of suitable targets for a compact rock drill, the final major sample acquisition system to be tested.

Ashwin Vasavada, the deputy project scientist for the Mars Science Laboratory rover at the Jet Propulsion Laboratory in Pasadena, Calif., told reporters that Curiosity's robot arm had completed five scoops of martian soil, using the sandy … Read more

3D printing has captured the imaginations of just about anyone who knows what it is -- even NASA, apparently.

The space agency is using a similar technology to create precise metal parts for its next heavy-lift rocket, which it hopes will eventually help take humans to Mars.

The method is called selective laser melting, or SLM, but it's not quite the same as printing up a sweet "Star Wars" chess set out of extruded plastic. It's more of a cross between 3D printing and some high-end, defense-grade awesome tech.… Read more