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Origin of Life

Early Oxygen Fuels Fire in OOL Camp
August 25, 2006
Live Science reported a new claim about oxygen on the early earth appearing far earlier than usually assumed.  A Penn State astrobiologist is claiming that uniformly high oxygen levels existed on earth 3.8 billion years ago, a billion years before previous estimates.     Oxygen’s presence on Earth has been typically inferred from sulfur isotope […]
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Astronomy

Early Large Spiral Galaxy Resembles Milky Way
August 18, 2006
Astronomers using adaptive optics at the Very Large Telescope (VLT) in Paranal, Chile took spectra of a galaxy at red-shift 2.38 described as an “early young galaxy” that must have, according to current theory, formed very rapidly, because it looks like the Milky Way.  The observations by Genzel et al., published in Nature,1 were described […]
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Solar System

Mars Annually Pops Its Polar Cork
August 17, 2006
A unique geological phenomenon has been found on Mars.  Every year, when the southern polar cap heats up, carbon dioxide gas forms underneath a layer of translucent ice.  This gas levitates large portions of the ice cap until it finds weaknesses, and bursts out at over a hundred miles an hour in spectacular fumaroles (see […]
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Solar System

It’s Tough to Get a Date, but Fun to Keep Trying
August 8, 2006
Geochronology is a perverse sort of game.  Like the proverbial clock shop apprentice who went crazy trying to get all the grandfather clocks to tick together, the scientist trying to interpolate earth’s past climate patterns from geochronometers has so many uncooperative variables, he can never hope for anything better than partial conformity to accepted visions […]
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Fossils

Is This Frog Marrow Really 10 Million Years Old?
July 25, 2006
LiveScience reported finding intact bone marrow from fossils of frogs and salamanders.  Without blinking an eye, reporter Ker Than croaked that the marrow is ten million years old.  He compared it with the intact soft tissue and blood cells found in a T. rex specimen last year (see 02/22/2006, 06/03/2005, 03/24/2005), and said, The discovery […]
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Cosmology

Theory Battles Observations in Near-Field Cosmology
July 23, 2006
Which is more important in science: a consistent model, or a good fit with observations?  Clearly both would be the ideal.  A report in Science1 this week revealed that astronomers are having trouble holding the two together.  The problem is especially acute for near-field cosmology that deals with nearby galaxies.     It may seem […]
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Fossils

Bear Tooth DNA Yields New Date Record: 400,000 Years
July 22, 2006
According to a story posted on Yahoo News, Swedish scientists found intact DNA in a bear tooth claimed to be 400,000 years old.  The team leader remarked, “It is usually hard to find DNA that is older than 100,000 years, and work on fossilized DNA mostly focuses on material that is a few tens of […]
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Uncategorized

Plate Tectonics: Are Modern Geologists Treading on Solid Ground?
July 14, 2006
Plate tectonics is the reigning theory of earth’s dynamic crust.  Laymen may not realize that acceptance of plate tectonic theory came quite suddenly in the 1960s.  It was like a revolution.  For decades, the consensus of geological scientists was adamantly against the notion of shifting plates moving horizontally in various directions.  Those who taught such […]
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Amazing Facts

Saturn E-Ring Oxygen Bubble Blown by Enceladus
July 11, 2006
From a distance, the little moon Enceladus at Saturn looks for all the world like a leaking water balloon.  The Cassini Mission just released a new photo of Enceladus that fits that description well.  The plumes are faintly visible emanating from the south pole of the 300-mile-across moon as it orbits beyond the rings.  A […]
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Solar System

Update:  Crater-Count Dating Squabble Unresolved
June 8, 2006
Remember the revelation last year that many craters on Mars used to infer ages may have been secondary impacts from fallback debris? (see 10/20/2005 entry).  Well, a microsymposium on this subject was held in Houston in March, and Richard Kerr in Science1 said that “125 planetary scientists deadlocked over how to apply crater-dating techniques to […]
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Early Man

Hobbit Man, Neanderthal Man Further Scrutinized
June 6, 2006
The positions of two alleged human ancestors in the family tree is becoming clearer, or murkier, depending on whom you ask.  This illustrates the uncertainty and disparity of opinions in this field. Hobbit workshop:  Regarding the diminutive skeletons dubbed Homo floresiensis found in Indonesia, opinions seems to be condensing around the idea they were true […]
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Solar System

Asteroid Sticks Together While Theories Disintegrate
June 1, 2006
[Guest article]  In an story entitled “Rubbly Itokawa revealed as ‘impossible’ asteroid,” New Scientist Space reported on findings gathered from the recent visit of Japanese spacecraft Hayabusa to the asteroid Itokawa (see 11/28/2005 bullet).  There seems to be no end of problems for scientists trying to fit the solar system into billions of years.  Now […]
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Solar System

See Comet Crumble
May 10, 2006
A comet is breaking up before our eyes.  Comet Schwassmann-Wachmann 3 has split into dozens of pieces and is crumbling quickly, like pieces of dried meringue.  Science News tells about the breakup, and it made Astronomy Picture of the Day.  The Hubble and Spitzer space telescopes are also documenting the event.     This is […]
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Uncategorized

Mt. St. Helens Performs Fast Rock
May 10, 2006
Before reading the caption, look at the picture of this football-field size mountain of rock at Astronomy Picture of the Day and guess how old it is.  The answer: about five months.  The smooth rock slab with its cornice tip has grown as much as a meter a day.  The caption contains links to more […]
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Origin of Life

The Porridge Before the Soup: Too Hot?
May 8, 2006
In the evolutionary theory of everything, there is a soup before the primordial soup we normally think of.  It’s the solar nebula, the whirling disk of dust, gas and ice that preceded the planets.  Scientists used to think the nebula was differentiated like chemicals in a giant centrifuge, with the rocks close to the sun […]
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