Tag: science
Testimony at a House hearing yesterday suggests OMB plans to end NASA’s planetary program are true
Testimony at a House hearing yesterday, including the refusal of an OMB representative to appear, lend weight to the rumors that OMB plans to end NASA’s planetary program.
Scientists have found evidence of a great lake below the surface of Europa
Scientists have found evidence for the existence of great shallow lakes below the surface of Europa.
Is shooting down Phobos-Grunt an option?
Is shooting down Phobos-Grunt an option?
Curing cancer using DNA and drugs
Curing cancer using DNA and drugs.
The Winds of Mars
Images taken 1363 days apart.
In two different papers published in two different journals in the past month, scientists have concluded that — despite the thinness of the planet’s atmosphere — the dunes and sands of Mars are being continually shaped and changed by its winds. In both papers the data from which this conclusion was drawn came from high resolution images taken by the HiRISE camera on Mars Reconnaissance Orbiter.
What is especially interesting about this conclusion is that the climate models that had been developed for the Martian atmosphere, combined with wind measurements gathered by the various Martian landers, had all suggested that the kind of strong winds necessary to move sand were rare. To quote the abstract of the paper published on Monday in the journal Geology, Bridges, et al,
Prior to Mars Reconnaissance Orbiter data, images of Mars showed no direct evidence for dune and ripple motion. This was consistent with climate models and lander measurements indicating that winds of sufficient intensity to mobilize sand were rare in the low-density atmosphere.
Similarly, the second paper, Silvestro, et al, published on October 22 in Geophysical Research Letters, stated that
results from wind tunnel simulations and atmospheric models show that such strong wind events should be rare in the current Martian atmospheric setting.
Yet, both studies found significant evidence that such winds do occur on Mars, and are moving sand in many different places.
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Congress has slashed the budget of John Holdren’s White House Science Office
The Senate/House final deal for the White House Science Office has slashed its budget by one third.
Frustrated that White House officials [i.e. John Holdren] have ignored congressional language curtailing scientific collaborations with China, legislators have decided to get their attention through a 32% cut in the tiny budget of the Office of Science and Technology Policy (OSTP).
See this story for more background.
NASA extends Messenger mission at Mercury one year
No surprise here: NASA has extended the Messenger mission at Mercury for one more year.
Bronze artifact found in Alaska
A bronze artifact, resembling the remains of a buckle and a thousand years older than the house being excavated, has been found by archeologists in Alaska.
One Asia archaeologist suggested the piece may have been part of a harness or horse ornament. The researchers are looking for an East Asia expert to confer with on the bronze piece. Mason said it’s not likely the bronze piece was washed ashore after being dropped by a Russian explorer or a whaler. “That’s totally unlikely, in fact nearly impossible, considering where it is,” he said.
The Mystery of the Lunar Ionosphere
The mystery of the Moon’s ionosphere.
Gold plated interstellar clouds, sprayed by supernovae
Russian space agency head says there is still a chance to save Phobos-Grunt
The head of the Russian space agency said yesterday that there is still a chance to save Phobos-Grunt.
“The probe is going to be in orbit until January, but in the first days of December the window will close” to re-programme it, he told Russian news agencies at Russia’s Baikonur cosmodrome in Kazakhstan.
He also said that the probe will not pose a threat, and will burn up in the atmosphere if it should fall to Earth.
Scientists have released a new 28 frame movie of asteroid 2005 YU55
Scientists have released a new 28 frame movie of asteroid 2005 YU55, created as the asteroid zipped past the Earth this past week.
Toxic Russian Mars probe aims for Earth
It now looks like the stranded and toxic Russian Mars probe, Phobos-Grunt, is likely aimed at Earth.
We are looking at an uncontrolled toxic reentry scenario. Phobos-Grunt . . . is fully-laden with unsymmetrical dimethylhydrazine and nitrogen tetroxide; that’s ten tons of fuel and oxidizer. The probe itself weighs-in at only three tons. . . . Phobos-Grunt’s batteries are draining and its orbit is degrading. It looks as if the probe will reenter later this month/early December. NORAD is putting a Nov. 26 reentry date on Phobos-Grunt.
Supernova may have kicked off solar system
A supernova may have kicked off the birth of our sun.
I have a article awaiting publication at Sky & Telescope on this same subject, though my piece also asks the question: What was the star cluster like in which the sun formed? And can we find that star cluster today?
New data says scientists must look underground for life on Mars
New data says scientists must look underground for life on Mars.
Are cows magnetic?
The uncertainty of science: Are cows magnetic?
The fastest spinning normal star
Astronomers find the fastest spinning normal star.
Astronomers find clouds of primordial gas from the early universe
Astronomers find clouds of primordial gas from the early universe.
And in related news, a new computer simulation suggests that the very first stars were not the giant monsters scientists had predicted.
New data suggests that the asteroid Lutetia is a Rare Survivor from the Birth of the Earth
A new analysis of data suggests that the asteroid Lutetia is a leftover fragment from the same original material that formed the Earth, Venus and Mercury.