Tag: science

A place on Mars that was possibly habitable only 200 million years ago.

9:43 pm

A place on Mars that was possibly habitable only 200 million years ago.

This article discusses the possibility of liquid water from the melting of the glaciers that scientists think once covered the western slopes of the giant volcano Arsia Mons. I have also written about this area in an article I wrote for Sky & Telescope last year on exploring caves in space. It is thought that there might be caves here in which some of that water from those glaciers might still be found.

As one scientist is quoted as saying in this article, “Arsia Mons would be the next place I would want to go.” Like the south pole of the Moon, it likely has all the ingredients for establishing a habitable colony.

One comment

An summary of the past week’s private effort at Aceibo to reactivate ISEE-3.

9:59 am

A summary of the past week’s private effort at Aceibo to reactivate ISEE-3.

They have discovered that the spacecraft is approximately 150,000 miles away from its expected position. This complicates the rescue effort significantly, as all their course corrections have to be recalculated based on this new position and they don’t yet have it refined enough to do those recalculations.

This has become extremely important as there is a solid statistical chance that the spacecraft could impact the moon or even be off course enough to threaten other spacecraft in Earth orbit. We are working with Mike Loucks of Space Exploration Engineering (SEE) our trajectory guy on this issue. An east coast company, Applied Defense (ADS) has also offered their help and engineering support to derive a new ephemeris from our new position reports. ADS and SEE did the trajectories for NASA’s just completed LADEE mission.

Hopefully by the end of this weekend they will have more to report.

One comment

The predicted new meteor shower last night was less than hoped but intriguing nonetheless.

9:18 am

The predicted new meteor shower last night was less than hoped but intriguing nonetheless.

Based on a few reports via e-mail and my own vigil of two and a half hours centered on the predicted maximum of 2 a.m. CDT (7 UT) Saturday morning the Camelopardalid meteor shower did not bring down the house. BUT it did produce some unusually slow meteors and (from my site) one exceptional fireball with a train that lasted more than 20 minutes.

One comment

Short of money for astrophysics because of the overruns on the James Webb Space Telescope as well as federal budget woes, NASA has decided to shut down the Spitzer Space Telescope.

9:11 am

Short of money for astrophysics because of the overruns on the James Webb Space Telescope as well as federal budget woes, NASA has decided to shut down the Spitzer Space Telescope.

Other missions, such as Kepler, Chandra, Hubble, NuStar, and Swift got extensions, however.

Leave a comment

The Sun settling down?

3:43 pm

Two weeks ago NOAA posted its monthly update of the solar cycle, showing the sunspot activity for the Sun in April. I have been remiss about doing my monthly post about this, so here it is now, posted below with annotations.

April Solar Cycle graph

The graph above has been modified to show the predictions of the solar science community. The green curves show the community’s two original predictions from April 2007, with half the scientists predicting a very strong maximum and half predicting a weak one. The red curve is their revised May 2009 prediction.

The Sun continued the drop in sunspots seen the previous month, though the total number remains above the 2009 prediction for this moment in the solar cycle. As already noted, that the second peak of this double peaked solar maximum has been much stronger than the first remains unprecedented.

Overall, the maximum continues to be the weakest seen in a hundred years. Whether this is an indicator of future events or an anomaly can only be discovered after the Sun completes this solar solar cycle and begins the ramp up to its next solar maximum, at least five years away.

The next update is only a few weeks away. Stay tuned.

5 comments

Designed and funded on the premise that it would fly past a Kuiper belt asteroid after it flew past Pluto, the New Horizons team has so far failed to find such an asteroid and is running out of time.

9:29 am

Designed and funded on the premise that it would fly past a Kuiper belt object (KBO) after it flew past Pluto, the New Horizons team has so far failed to find such an asteroid and is running out of time.

In theory, project scientists should have identified a suitable KBO long ago. But they postponed their main search until 2011, waiting for all the possible KBO targets to begin converging on a narrow cone of space that New Horizons should be able to reach after its Pluto encounter. Starting to look for them before 2011 would have been impossible, says Grundy, because they would have been spread over too much of the sky.

Now that the hunt for KBOs is on, the New Horizons researchers have mainly been using the 8.2-metre Subaru Telescope in Hawaii and the 6.5-metre Magellan Telescopes in Chile. They have found about 50 new KBOs; none is close enough for New Horizons to reach.

I always thought it unlikely that they would be able to, on the fly, find a suitable candidate that New Horizons could reach in the very empty vastness beyond Pluto. In fact, it seemed absurd and to me seemed instead a transparent public relations ploy to get the funding for the fly-by mission to Pluto. Sadly, my cynical perspective here appears to be turning out to be true.

6 comments

The first preliminary list of candidate landing sites for NASA’s next Mars rover have been proposed.

9:59 am

The first preliminary list of candidate landing sites for NASA’s next Mars rover have been proposed.

At the conclusion of the workshop, attendees voted informally on the nearly 30 candidate sites that researchers had presented—ranking the sites as being of high, medium, or low scientific interest. Floating to the top was a site called Northeast Syrtis Major, a terrain at the edge of the Isidis Basin, the remnant of one of Mars’s biggest and most ancient asteroid impacts. Jack Mustard, a planetary scientist at Brown University and an advocate for the site, says material from the impact could offer a precise date for that event. Scientists also want a piece of nearby lava flows, thought to have oozed out and cooled several hundred million years later.

Nothing is even close to being decided yet, however.

In related news, a new study suggests that dozens of microbes might have stowed away on Curiosity when it left for Mars.

Emphasis must be placed on the word “suggests” however.

One comment

NASA has approved a new mission for the crippled Kepler space telescope, allowing observations to continue for another two years.

9:03 am

Like a phoenix: NASA has officially approved the new mission for the crippled Kepler space telescope, allowing observations to continue for another two years.

During the K2 mission, Kepler will stare at target fields in the plane of Earth’s orbit, known as the ecliptic, during observing campaigns that last about 75 days each. In this orientation, solar radiation pressure can help balance the spacecraft, making the most of Kepler’s compromised pointing ability, team members said.

Hopefully the application of clever engineering will allow scientists to get data good enough to spot some more exoplanets.

One comment

After concluding eight years of science observations in orbit around Venus, Venus Express is about to begin a series of atmospheric plunges to test the engineering of aerobraking at the extreme.

11:28 am

After concluding eight years of science observations in orbit around Venus, Venus Express is about to begin a series of atmospheric plunges to test the engineering of aerobraking at the extreme.

They plan to dive into Venus’s hellish atmosphere as low as 80 miles, where they hope not only to get data about this little studied region but to also learn more about the engineering of aerobraking. The article also gives a nice overview of the knowledge that Venus Express gathered in the past eight years.

Leave a comment

Want to watch some astronomers blow up the top of a mountain? You can!

11:14 am

Want to watch some astronomers blow up the top of a mountain? You can!

Seriously, construction crews will in June begin blasting to prepare this mountain top in Chile for the European Extremely Large Telescope (E-ELT), a gigantic optical telescope that will have a primary mirror 39 meters or 128 feet across and is scheduled for completion sometime in the next decade. To mark the event they will be providing a live stream for everyone worldwide to watch.

Leave a comment

According to a prominent climate scientist, a research paper he co-authored suggesting the threat of global warming from carbon dioxide is exaggerated was rejected for publication for political reasons.

9:37 am

According to a prominent climate scientist, a research paper he co-authored suggesting the threat of global warming from carbon dioxide is exaggerated was rejected for publication for political reasons.

The five contributing scientists submitted the paper to Environmental Research Letters – a highly regarded journal – but were told it had been rejected. A scientist asked by the journal to assess the paper under the peer review process reportedly wrote: ‘It is harmful as it opens the door for oversimplified claims of “errors” and worse from the climate skeptics media side.’

Prof Bengtsson, 79, said it was ‘utterly unacceptable’ to advise against publishing a paper on the political grounds. He said: ‘It is an indication of how science is gradually being influenced by political views. The reality hasn’t been keeping up with the [computer] models.

Bengtsson is also the same climate scientist who was forced to resign last week from a skeptical global warming think tank because of threats of blacklisting if he did not.

Leave a comment

Rosetta photographs its target comet as it comes to life.

6:25 am

Rosetta photographs its target comet as it comes to life.

The comet 67P/Churyumov-Gerasimenko, target of ESA’s Rosetta mission, has begun to develop a dust coma. This can be seen in a series of images taken by OSIRIS, the spacecraft’s scientific imaging system, between March 27th and May 4th. In the images from the end of April, the dust that the comet is already emitting is clearly visible as an evolving coma and reaches approximately 1300 kilometers into space.

Leave a comment

Though they really don’t need it, a private effort to reactivate a 1970s spacecraft has now gotten NASA’s okay.

10:34 am

Though they really don’t need it, a private effort to reactivate a 1970s spacecraft has now gotten NASA’s okay.

This piece of paper from NASA is a definite nice-to-have, given that “a private entity cannot legally salvage U.S. government property in space,” according to Mike Gold, a space law expert and attorney who works full time as the head of Washington operations for Bigelow Aerospace, the North Las Vegas, Nevada, company developing inflatable space habitats with technology licensed from NASA.

But practically speaking, it appears NASA could have done little to stop the ISEE-3 Reboot project from moving ahead with its plan to take over the old spacecraft — an Earth-Sun observatory that launched to the gravitationally stable Earth-Sun Lagrange point 1 in 1978 and is now swinging back toward the home planet in the heliocentric orbit NASA nudged it into in 1982 to chase comets.

What is really more important is that their effort to raise the necessary private funds for this project has largely succeeded.

Leave a comment

Using computer models and data collected in the past decade, some climate scientists now believe that a major Antarctica ice sheet is in the process of collapsing.

10:20 am

Using computer models and data collected in the past decade, some climate scientists now believe that a major Antarctica ice sheet is in the process of collapsing.

One team combined data on the recent retreat of the 182,000-square-kilometer Thwaites Glacier with a model of the glacier’s dynamics to forecast its future. In a paper published online today in Science, they report that in as few as 2 centuries Thwaites Glacier’s outermost edge will recede past an underwater ridge now stalling its retreat. Their modeling suggests that the glacier will then cascade into rapid collapse. The second team, writing in Geophysical Research Letters (GRL), describes recent radar mapping of West Antarctica’s glaciers and confirms that the 600-meter-deep ridge is the final obstacle before the bedrock underlying the glacier dips into a deep basin.

Because inland basins connect Thwaites Glacier to other major glaciers in the region, both research teams say its collapse would flood West Antarctica with seawater, prompting a near-complete loss of ice in the area. “The next stable state for the West Antarctic Ice Sheet might be no ice sheet at all,” says the Science paper’s lead author, glaciologist Ian Joughin of the University of Washington (UW), Seattle.

This result really falls under the category of the uncertainty of science. Though the data suggests a glacier that is part of the much larger West Antarctica ice sheet is melting, the prediction that the ice sheet itself will collapse sometime in the next two centuries is solely based on computer models that have all too often turned turned out to be wrong.

4 comments

Some scientists are now calling into question the BICEP2 results that confirmed the existence of inflation just after the Big Bang.

10:12 am

The uncertainty of science: Some scientists are now calling into question the BICEP2 results that confirmed the existence of inflation just after the Big Bang.

The biggest discovery in cosmology in a decade could turn out to be an experimental artifact—at least according to an Internet rumor. The team that reported the discovery is sticking by its work, however.

Eight weeks ago, researchers working with a specialized telescope at the South Pole reported the observation of pinwheel-like swirls in the polarization of the afterglow of the big bang, or cosmic microwave background (CMB). Those swirls are traces of gravitational waves rippling through the fabric of spacetime a sliver of a second after the big bang, argue researchers working with the Background Imaging of Cosmic Extragalactic Polarization 2 (BICEP2) telescope. Such waves fulfilled a prediction of a wild theory called inflation, which says that in the first 10-32 seconds, the universe underwent a mind-boggling exponential growth spurt. Many scientists hailed the result as a “smoking gun” for inflation.

However, scientists cautioned that the result would have to be scrutinized thoroughly. And now a potential problem with the BICEP analysis has emerged, says Adam Falkowski, a theoretical particle physicist at the Laboratory of Theoretical Physics of Orsay in France and author of the Résonaances blog. The BICEP researchers mapped the polarization of the CMB across a patch of sky measuring 15° by 60°. To study the CMB signal, however, they first had to subtract the “foreground” of microwaves generated by dust within our galaxy, and the BICEP team may have done that incorrectly, Falkowski reports on his blog today.

When the BICEP2 result was announced, the media went crazy over it. I however didn’t even post anything about it, as I know from experience that cosmological results such as this are very tentative and require confirmation. Too often, they turn out to be false results, with the scientists in charge fooled by the uncertain nature of their data.

The results from BICEP2 might still hold up. We need to wait a bit longer to find out.

Leave a comment
1 … 183 184 185 186 187 … 271