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Astronomy

How to Avoid Dark Energy
March 15, 2008
Who needs dark energy?  Copernicus?  George Ellis (U. of Cape Town) said we could get rid of dark energy by throwing the Copernican Principle overboard.  Writing in Nature,1 he said that dark energy may simply be an artifact of the geometry of space-time.     Copernicus did not invent the Copernican Principle.  He was just […]
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Physics

Falling Rocks Leave Holes in Science
March 13, 2008
Hard data in astronomy is hard to come by, except when it comes by special delivery – as with meteorites.  If there is any class of phenomena that should be well understood, it should be space debris and the craters they form, because the processes involved can be watched in real time.  Meteorites adorn many […]
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Solar System

Saturn Moons Continue to Surprise Scientists
March 10, 2008
Just days before a long-awaited dive into the plume of Enceladus (see PhysOrg and JPL press release, flyby stats and news release), Cassini found another surprise in the Saturn system: a moon with rings.     A Jet Propulsion Lab press release on March 6 reported that the large moon Rhea may have rings – […]
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Astronomy

Is Cosmology Getting Wimp-y?
February 28, 2008
Physics and astronomy are usually thought of as the “hard” sciences, where empiricism is king.  Read the following excerpts from a story on the BBC News science page with that in mind (suggestion: replace “dark matter” with “mysterious unknown stuff”). The first stars to appear in the Universe may have been powered by dark matter, […]
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Astronomy

Distant Galaxy Surprises Astronomers
February 19, 2008
Using the Hubble Space Telescope viewing a distant galaxy cluster as a gravitational lens, astronomers detected a new record-holder: a galaxy bright with stars almost as old as the big bang.  The story on Science Daily called this a galaxy, with redshift 7.6, a “strong contender for the galaxy distance record.”     According to […]
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Origin of Life

Mars Life Hung Out to Dry in Salt
February 18, 2008
Scientists have just about hanged the possibility for life on Mars.  At first, the acid measured by the Spirit and Opportunity rovers made the environment look inhospitable.  “Now, we also appreciate the high salinity of the water when it left behind the minerals Opportunity found,” said Mark Knoll on a JPL press release.  “This tightens […]
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Solar System

Titan Is Old-Age Problem, Despite News Media Coverage
February 15, 2008
A paper in Geophysical Research Letters1 about Saturn’s largest moon, Titan, reads like a good-news, bad-news joke.  The good news is that Titan appears to have more hydrocarbons than Earth.  The bad news is that it is not enough to save the assumption that Titan is 4.5 billion years old.     Several science news […]
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Solar System

Something is Cooking Under Enceladus
February 9, 2008
Planetary scientists have been puzzling over Enceladus, a small moon of Saturn, since geysers were discovered erupting from its south pole three years ago.  Some models suggested that eruptions could occur without liquid water, but others were not sure.     Opinion now seems to be shifting back to the necessity of a wet interior, […]
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Physics

Are Long-Term Climate Models Trustworthy?
February 5, 2008
Everything from global warming policy to evolutionary history depends on long-term climate models.  Textbooks make it seem like earth keeps reliable recordings that allow scientists to simply read off the record of years, decades, centuries, millennia and millions of years objectively.  It’s not that simple, wrote Maureen E. Raymo and Peter Huybers in Nature last […]
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Intelligent Design

SETI Signals Could Be Loaded with Information
February 4, 2008
Unusual properties of electromagnetic waves allow for a higher carrying capacity of information than thought.  SETI researcher Seth Shostak reported on Space.com that Swedish researchers have found a possible “subspace channel” in the orbital angular momentum of narrowband radio waves that might allow the encoding of information.  This information would be impervious to the jumbling […]
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Intelligent Design

Explorer 1 Chief Discovers Design
January 31, 2008
On this day 50 years ago, America entered the space race.  On January 31, 1958, America gave its answer to Sputnik: a civilian satellite named Explorer 1.  Within a few hours of the time of day these words are being written, von Braun’s Jupiter-C rocket at Cape Canaveral, Florida, successfully launched a JPL satellite into […]
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Solar System

The Geologists Were Wrong
January 25, 2008
More examples of collapsing theories have appeared in the literature this week (compare last week, 01/21/2008): Dirty Comet:  The Stardust spacecraft that collected comet samples in 2006 was so named because it was believed comets contained pristine material from the birth of the sun.  That has all changed.  National Geographic News summarized a paper in […]
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Solar System

Messenger Sends Postcards from Mercury
January 17, 2008
Images downloaded from MESSENGER’s first flyby of Mercury on January 14 are starting to be published.  The Science Images page of the MESSENGER website (MErcury Surface, Space ENvironment, GEochemistry, and Ranging) posted the first image January 16, with more being added from time to time.  Launched in 2004 (07/27/2004, bullet 3), the spacecraft has unveiled […]
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Cosmology

NY Times: Cosmologists Have Lost Their Brains
January 15, 2008
Naked brains floating in space, disconnected from reality – this describes the minds of some modern cosmologists, accused Dennis Overbye in a shocking article in the New York Times January 15.  While attempting to be sympathetic to the smart guys who can cover a blackboard with equations about higher dimensions, it was clear he was […]
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Astronomy

Zatta Fact?  “Scientific Facts” Evolve
January 14, 2008
Every once in awhile it is good to be reminded that “scientific facts” are in a constant state of revision.  Here are some recent examples of scientists with surprised looks on their faces: Cholesterol for health:  Surprise, says EurekAlert: cholesterol may actually pose health benefits.  “… don’t push aside bacon and eggs just yet,” it […]
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