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Voyager 1 spacecraft reaches interstellar space

University of Iowa researchers confirm Voyager 1's entry into interstellar space after detecting electron plasma oscillations at a frequency corresponding to an electron density about 40 times greater than expected. The spacecraft is now the most distant human-made object at over 11.6 billion miles from the sun.

SourceUniversity of Iowa·JournalScience·DateSep 12, 2013

Angling for gold

A new model provides an alternative description of atomic-level gold bonding, taking into account bond directionality. The Tersoff potential model allows for reliable covalent bonds between gold atoms and other materials.

SourceSpringer·JournalThe European Physical Journal B·DateSep 19, 2012