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Latest Mark Thiemens Stories

Earthen Crust Oxygen Got Its Start During Creation Of Solar System
2013-10-25 07:03:56

April Flowers for redOrbit.com - Your Universe Online A long standing mystery in the formation of the Solar System has been solved by cosmochemists from the University of California, San Diego (UCSD). In the oldest, most pristine rocks, oxygen, the most abundant element in the Earth's crust, follows a strange, anomalous pattern that must result from a different chemical process than the well-understood reactions that form minerals containing oxygen on Earth. "Whatever the source of...

Cooking Up Our Solar System, What's The Recipe?
2013-02-21 05:05:42

April Flowers for redOrbit.com - Your Universe Online A research team from the University of California, San Diego is hoping to learn how our solar system evolved by studying the origins of different isotope ratios among the elements that make up today´s smorgasbord of planets, moons, comets, asteroids, and interplanetary ice and dust. The scientists are led by Mark Thiemens, Dean of the Division of Physical Sciences, who has worked on this problem for over three decades. Most...

2011-08-16 05:05:00

A small spike in radioactive sulfur from Japan's crippled nuclear plant was detected in southern California between March 22 and April 1, according to the first quantitative measurement of the amount of radiation leaked from the damaged Fukushima Daiichi plant. However, scientists say the amount of radiation, while higher than normal background levels, was too small to pose health threats. "The levels we recorded aren't a concern for human health. In fact, it took sensitive instruments,...

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2010-11-08 14:27:45

By Kim McDonald, UC San Diego Chemists at UC San Diego have uncovered a new chemical reaction on tiny particulates in the atmosphere that could allow scientists to gain a glimpse from ancient rocks of what the atmospheres of the Earth and Mars were like hundreds of millions years ago. Their discovery also provides a simple chemical explanation for the unusual carbonate inclusions found in a meteorite from Mars that was once thought by some scientists to be evidence of ancient Martian life....

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2008-09-08 09:35:00

Results critical to interpretation of GENESIS spacecraft samples of the sun A strange mix of oxygen found in a stony meteorite that exploded over Pueblito de Allende, Mexico nearly 40 years ago has puzzled scientists ever since. Small flecks of minerals lodged in the stone and thought to date from the beginning of the solar system have a pattern of oxygen types, or isotopes, that differs from those found in all known planetary rocks, including those from Earth, its Moon and meteorites from...

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2008-08-21 18:06:08

Ah, nothing like breathing clean coastal air, right? Think again. Chemists at UC San Diego have measured for the first time the impact that dirty smoke from ships cruising at sea and generating electricity in port can have on the air quality of coastal cities. The scientists report in this week's early online edition of the journal Proceedings of the National Academy of Sciences that the impact of dirty smoke from ships burning high-sulfur fuel can be substantial, on some days accounting for...

2005-08-11 13:38:32

WASHINGTON (Reuters) - Our Sun was already shining brightly more than 4.5 billion years ago, as dust and gas was swirling into what would become the planets of the solar system, U.S. researchers reported on Thursday. They said their finding is the first conclusive evidence that the so-called protosun affected the developing the solar system by emitting enough ultraviolet energy to catalyze the formation of organic compounds, water and other elements necessary for the evolution of...

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2005-08-11 13:35:00

WASHINGTON -- Our Sun was already shining brightly more than 4.5 billion years ago, as dust and gas was swirling into what would become the planets of the solar system, U.S. researchers reported on Thursday. They said their finding is the first conclusive evidence that the so-called protosun affected the developing the solar system by emitting enough ultraviolet energy to catalyze the formation of organic compounds, water and other elements necessary for the evolution of life on Earth. "The...


Word of the Day
cacodemon
  • An evil spirit; a devil.
  • A nightmare.
  • In astrology, the twelfth house of a scheme or figure of the heavens: so called from its signifying dreadful things, such as secret enemies, great losses, imprisonment, etc.
'Cacodemon' comes from a Greek term meaning 'evil genius.'
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