Latest Mark Thiemens Stories
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.
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.
A small spike in radioactive sulfur from Japanâ€™s crippled nuclear plant was detected in southern California between March 22 and April 1.
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.
Results critical to interpretation of GENESIS spacecraft samples of the sun.
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.
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.
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.
- A poem in which the author retracts something said in an earlier poem.