Tag: science

More evidence that there are active flows of water on Mars

2:34 pm

flow features on Mars

More evidence that there are active flows of water on Mars.

Dark, finger-like features appear and extend down some Martian slopes during late spring through summer, fade in winter, and return during the next spring. Repeated observations have tracked the seasonal changes in these recurring features on several steep slopes in the middle latitudes of Mars’ southern hemisphere.

Though there are a number of unsolved issues about these features, the best explanation appears to be a liquid brine.

Saltiness lowers the freezing temperature of water. Sites with active flows get warm enough, even in the shallow subsurface, to sustain liquid water that is about as salty as Earth’s oceans, while pure water would freeze at the observed temperatures.

Go here to see the full image.

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It’s the coverup, not the crime

10:39 am

A new Rasmussen poll finds that 69% of the public now believe that climate scientists falsified data to support their own theories about global warming. Moreover, these numbers are up ten points since December 2009, which happens to be just after the climategate emails were released.

These terrible numbers are further evidence that the willingness of the scientific community to whitewash their investigations of the climategate scientists, what I consider to be the equivalent of a community-wide cover-up, has done serious harm to science and its reputation.
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Did the Earth once have two moons? And did they collide?

3:44 pm

Did the Earth once have two moons?

Both satellites would have formed from debris that was ejected when a Mars-size protoplanet smacked into Earth late in its formation period. Whereas traditional theory states that the infant Moon rapidly swept up any rivals or gravitationally ejected them into interstellar space, the new theory suggests that one body survived, parked in a gravitationally stable point in the Earth–Moon system.

This new model also posits that the two moons eventually collided, producing the moon we have today.

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Dawn begins science operations in orbit around Vesta

2:46 pm

The Dawn science team today released what they are calling “the first full-frame image” of Vesta. The image is shown below the fold.

The picture was taken from 3,200 miles, and shows a pockmarked irregularly shaped world. While many features that resemble the Moon (the craters, the rays radiating out from those craters), that Vesta itself is not spherical makes it very much unlike the Moon. It is probably going to take scientists several months at least to decipher the data they are getting and come up with some concrete conclusions about this strange dwarf planet.
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John Marburger: The passing of a scientific gentleman

5:40 pm

Guest post by Phil Berardelli

John H. Marburger III, former science adviser to President George W. Bush and head of the White House Office of Science and Technology Policy, died this past week from non-Hodgkins lymphoma. He was 70.

Just about every news article reporting the death describes Dr. Marburger, a physicist and former head of the Brookhaven National Laboratory, as a controversial figure. This article, for instance, in The New York Times, said the following about Marburger:

In a critical editorial in April 2004, The New York Times, addressing accusations that the Bush administration had distorted or suppressed scientific information that would conflict with its policy preferences, acknowledged the respect Dr. Marburger commanded, calling him “a respected physicist and lifelong Democrat who would not seem an automatic apologist for this administration.” But it added, “The question yet to be answered is whether he is speaking from conviction when he claims that the critics are off base or is serving as a frontman for an administration whose activities in this area are sometimes hard to defend.”

Apparently, because Marburger — a Democrat and one of the longest-serving members of the administration — supported some of the positions espoused by the Bush White House, that made him controversial. But in my 40 years as a journalist and 15 years of covering science, I can’t think of a person I encountered who was more earnest and straightforward.
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The Painted Desert of Mars

11:58 pm

Mars Reconnaissance Orbiter released this picture yesterday of what the Orbiter’s scientists have labeled “The crazy floor of Hellas Basin.” Below you can see a cropped image of only one part of the large higher resolution image. The NASA caption says that the wild colors probably “indicate that diverse minerals are present,” meaning that any settlers of the red planet will probably take a close look at this location with the reasonable hope of finding the resources they need to colonize a planet.

To me, these colors also indicate that this place on Mars would probably one of its most popular tourist spots. As I look at the image my eye instinctively wants to trace out the best trail route along the ridges and down into the gullies in order to give hikers the best view of this colorful terrain.

Hellas Basin

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New NASA Data Blow Gaping Hole In Global Warming Alarmism

1:25 pm

The headline says it all: New NASA data blow gaping hole in global warming alarmism.

Scientists on all sides of the global warming debate are in general agreement about how much heat is being directly trapped by human emissions of carbon dioxide (the answer is “not much”). However, the single most important issue in the global warming debate is whether carbon dioxide emissions will indirectly trap far more heat by causing large increases in atmospheric humidity and cirrus clouds. Alarmist computer models assume human carbon dioxide emissions indirectly cause substantial increases in atmospheric humidity and cirrus clouds (each of which are very effective at trapping heat), but real-world data have long shown that carbon dioxide emissions are not causing as much atmospheric humidity and cirrus clouds as the alarmist computer models have predicted.

The new NASA Terra satellite data are consistent with long-term NOAA and NASA data indicating atmospheric humidity and cirrus clouds are not increasing in the manner predicted by alarmist computer models. The Terra satellite data also support data collected by NASA’s ERBS satellite showing far more longwave radiation (and thus, heat) escaped into space between 1985 and 1999 than alarmist computer models had predicted. Together, the NASA ERBS and Terra satellite data show that for 25 years and counting, carbon dioxide emissions have directly and indirectly trapped far less heat than alarmist computer models have predicted. [emphasis mine]

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Astronomers identify Earth’s first Trojan asteroid

9:53 pm

Astronomers have spotted the first Trojan asteroid to the Earth.

The asteroid is roughly 1,000 feet (300 meters) in diameter. It has an unusual orbit that traces a complex motion near a stable point in the plane of Earth’s orbit, although the asteroid also moves above and below the plane. The object is about 50 million miles (80 million kilometers) from Earth. The asteroid’s orbit is well-defined and for at least the next 100 years, it will not come closer to Earth than 15 million miles (24 million kilometers).

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ISS to be deorbited in 2020

7:47 am

The head of the Russian space agency said today that ISS will be deorbited in 2020, as agreed to by the governments running it.

Wanna bet? They are only now starting to do the research the station is best designed for, and learning how to live in space for years is going to take years. Come 2020, that work will hardly be done. Moreover, the impossibility of replacing ISS without a shuttle to haul up large modules and trusses will make very appealing the idea of keeping the present station in operation.

Then again, everything I just wrote is simple common sense, and who ever expected common sense from these governments?

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ISS partners discuss how to use the space station as a test bed for missions beyond low Earth orbit.

8:43 pm

Now why didn’t they think of this before? The ISS partners met today to discuss how to use the space station as a test bed for missions beyond low Earth orbit.

As I wrote in Leaving Earth, a space station is nothing more than a prototype interplanetary spaceship. This kind of research is really its main purpose, and I am glad that the governments running ISS are finally beginning to recognize it, even though their engineers have known it for decades. Note too that the press release above also gives a nice overview of some of the ongoing research on ISS that is directly related to learning how to survive in space for long periods.

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Better constants in science

1:22 pm

More precise constants in science.

The numbers include reduced uncertainties for several key constants, which physicists say is encouraging because these will allow for better tests of theory. The more precise figures will also aid plans to redefine familiar units of measure­ment, such as the kelvin and the kilogram, in terms of unchanging fundamental constants rather than relying on a material object that might not be stable (as for the kilogram standard).

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Thank the Gods for Climategate

1:03 pm

Thank the gods for climategate.

We are certainly in a far different world vis-a-vis global warming than 21 months ago. The [global warming] climatologists are, to a very large extent, being ignored. Yes, there is an IPCC coming up, and perhaps we should wait until that is over. But I will predict that no matter what hoohah comes out of it, it will not have 50% of the energy of the previous IPCCs, because governments just aren’t listening with baited breath anymore. If there is any place where the mojo counted, it was with governments. But it ain’t there any more.

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Junk journalism

12:50 pm

In a piece today at the Huffington Post, science journalist Seth Borenstein declares the wonders of NASA’s next mission: to send astronauts to an asteroid by 2025, as declared by President Obama.

If you believe this is going to happen, then I have a bridge I want to sell you. To do it we need a spaceship in which people can live for at least a year, and a rocket to get that ship into orbit. Not only do we not yet know how to build such a spaceship, we no longer have the capability of putting it into orbit. In case you’re unaware (Borenstein acts like he is), the space shuttle no longer exists. And under this administration and Congress, any replacement we get isn’t going to be able to launch such an interplanetary spaceship anywhere in the near future, especially faced as we are with the present federal debt.

The disgraceful thing about this article, however, is the lack of skepticism shown by Borenstein.
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In color from Mercury

2:30 pm

The Messenger spacecraft has now been in orbit around Mercury since the end of March, almost four months. During that time the probe has sent back many fascinating images, showcasing a hot, alien planet whose surface was formed by impacts, volcanic activity, and some processes that no one as yet understands.

Most of the released images, however, have been in black and white, which at first glance makes one think that Mercury is not unlike the Moon. This week the Messenger team released a color image, demonstrated clearly how false this assumption is. The image below shows two very different craters, a dark-haloed crater named Basho at the bottom left of the image, and a very bright crater, Kalidasa crater, near the top left. On the right of the image is a dark haloed Tolstoj basin. For an uncropped full resolution version go here.

color image from Mercury
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The next Mars rover will land at Gale Crater

11:46 am

The next Mars rover will land at Gale Crater.

The car-sized Mars Science Laboratory, or Curiosity, is scheduled to launch late this year and land in August 2012. The target crater spans 96 miles (154 kilometers) in diameter and holds a mountain rising higher from the crater floor than Mount Rainier rises above Seattle. Gale is about the combined area of Connecticut and Rhode Island. Layering in the mound suggests it is the surviving remnant of an extensive sequence of deposits. The crater is named for Australian astronomer Walter F. Gale. . . . The portion of the crater where Curiosity will land has an alluvial fan likely formed by water-carried sediments. The layers at the base of the mountain contain clays and sulfates, both known to form in water.

More here, including images of landing site.

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