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Solar System

Moon Still Feeling the Impact
May 21, 2008
Craters on the moon seem so old.  Astronomers count them to try to figure out how long ago the surface was battered by impacts.  Although amateurs have claimed to see flashes on the moon’s surface through backyard telescopes, serious astronomers dismissed many of the reports as stories from the lunatic fringe.  “Not any more,” says […]
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Health

Beware of Starstuff
May 19, 2008
Stars can be dangerous.  They spew out deadly particles, unless you are protected from them in a safety bubble – like Earth has.  The Earth’s magnetic field and atmosphere only let in the life-giving part of sunlight.  Studies of other stars, and our own moon, show that things could be far worse. Record flare:  A […]
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Astronomy

Star Light, Star Bright, I Wish I Knew What’s Going On
May 16, 2008
Astronomy is fun, if for no other reason than it gives one endless opportunities to be shocked and surprised. Pulsar outside the box:  Theory has it all laid out nice and neat.  Pulsars form when a red giant drops matter onto a binary companion, making it go boom in a supernova, leaving behind a spinning […]
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Origin of Life

Earth’s Core Values Questioned
May 11, 2008
Geologists have long assumed that iron attracted certain elements toward the earth’s core during its formation.  The amounts of them we find today were added by meteorites and comets as a veneer on the surface later.  A press release from Florida State University is questioning those core values.  New research “calls into question three decades […]
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Solar System

Iapetus Is Losing Its Dry Ice
May 5, 2008
How long can a moon afford to leak?  Iapetus is losing its dry ice (carbon dioxide) through sublimation at a prodigious rate, say scientists in a paper in Icarus this month.1  “One can see that the long-term stability of CO2 is problematic.”     Solving the mystery of the dark side on this mystery moon […]
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Astronomy

First Galaxies Fast and Compact
May 3, 2008
The old picture: after the big bang, matter is diffuse.  Out of the darkness, stars slowly begin to form, as the first galaxies take shape.  Galaxies start out large and slowly grow more dense and structured over billions of years.  The new picture: the first galaxies are very compact and dense, spinning rapidly, with stars […]
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Origin of Life

Astrobiologists Pool Their Ignorance at AbSciCon
May 1, 2008
A big conference on Astrobiology was held in Santa Clara, California last month.  It was the fifth AbSciCon (Astrobiology Science Conference), a bi-annual cross-disciplinary event.  This one pulled together 675 researchers from 28 countries across a variety of disciplines, all interested in life in space.  Naturally, evolution was an overarching theme.  From Edna DeVore’s account […]
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Astronomy

Hubble Snaps Colliding Galaxies
April 24, 2008
A new catalog of colliding galaxy images has been released by the Hubble Space Science Institute.  The 59 images show “close encounters that sometimes end in grand mergers and overflowing sites of new star birth as the colliding galaxies morph into wondrous new shapes.”  The release coincided with the 18th anniversary of the Hubble Space […]
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Astronomy

Findings vs Surmisings in Astronomy
April 21, 2008
The Galex satellite (Galaxy Evolution Explorer) found “bright features” with an ultraviolet glow in the outskirts of a spiral galaxy, reported the BBC News.  What are they?  Scientists “think” they are large clusters of stars.  How much is known, and how much is interpreted?     The region imaged is the dark area around spiral […]
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Cosmology

Is Inflation Theory in Trouble?
April 18, 2008
For more than a quarter of a century, “inflation” has been viewed as the savior of the Big Bang theory.  The Big Bang was in trouble in the late 1970s because of the flatness problem and the horizon problem: our universe appeared to be too homogeneous and isotropic to be an accident.  If a runaway […]
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SETI

Imagination as Science
April 17, 2008
Can a science exist without evidence?  Astrobiology, and its subcategory “the search for extraterrestrial intelligence,” involve a great deal of scientific equipment, trained researchers, and funding, but still have no observational evidence to support their reason for being: extraterrestrial life.  Where is the line between imagination and reality in these fields?     Some insight […]
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Health

Mars Lacks Safety Shield for Humans
April 3, 2008
Forget all those optimistic, futuristic sci-fi tales of humans landing on Mars.  It isn’t safe, said Space.com.  NASA’s space radiation program doubts that a human body could survive prolonged exposure to space.  This is a problem for long stays on the moon, too.     “The magnetic field of Earth protects humanity from radiation in […]
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Dumb Ideas

Fooling Oneself About Aliens
April 1, 2008
Would you give a Bible to a Neanderthal, or invite a porpoise to your church?  Who would ask such questions?  Seth Shostak would – director of the SETI Institute.  On Space.com, he speculated about “alien sociology.”     Shostak wrote the weekly SETI column for Space.com to answer critics who think that broadcasting our presence […]
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Origin of Life

Enceladus: Hotter Chemical Plume Found
March 26, 2008
Initial results of Cassini’s March 12 flyby of Enceladus have been published.  You can watch a replay of today’s press briefing, read the blog, and read illustrated bulletins about the organic material, chemical signatures, hot spot locations, the stellar occultation (see also the Quicktime animation).  Another article shows the plume locations.  An astrobiologist (Chris McKay) […]
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Physics

Crater Dater Deflator: Impactors Can Be Recycled
March 25, 2008
They came from outer space – that was the old paradigm about impactors that made craters on planetary bodies.  Then, we learned how secondary craters can confuse a surface’s history (06/08/2006, 09/25/2007).  Now, two papers in Icarus show that moons can do a lateral pass.     Alvarellos et al,1 showed that Jupiter’s moon Io […]
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