McAlester News-Capital, McAlester, OK

Features

July 24, 2013

Origin of gold found in rare neutron-star collisions

Gold — atomic number 79, element symbol Au, the most widely beloved of the precious metals — might have its origin in extremely rare and violent explosions in the far reaches of outer space. The bling apparently begins with a blam.

For many years, scientists had theorized that the heavy elements of the periodic table, such as gold, platinum, lead and uranium, had their origin in supernova explosions. But the source, scientists announced Wednesday, might be even more exotic: the collision of two ultra-dense objects called neutron stars.

"We now have kind of a smoking gun," said Edo Berger, an astronomer who led the research at the Harvard-Smithsonian Center for Astrophysics in Cambridge, Mass.

The elements on Earth are all of cosmic origin. Carbon and oxygen atoms in our bodies, for example, come from the interior of stars, where they were formed under high pressure and heat. They were later spewed into the universe in supernova explosions. It is literally true, as Carl Sagan was fond of saying, that we are all star stuff.

But what hasn't been known is whether these supernova events could account for the heaviest of the elements. A heavy element such as gold has 79 protons, 79 electrons and 118 neutrons. That's a lot of mass for one atom. Most of the elements are simpler; gold and the other heavy elements are cosmically extravagant.

The neutron stars might provide the explanation.

Neutron stars are the collapsed cores of stars that have exploded in a supernova. A neutron star might be roughly the diameter of Washington but contain as much mass as our sun, all of it crammed together by the force of gravity, until even the atoms have collapsed, leaving the object with the density of an atomic nucleus.

A teaspoon full of neutron-star material would weigh, on Earth, about 5 billion tons, Berger said.

Text Only | Photo Reprints
Features
Seasonal Content
AP Video
Kerry: Humanitarian Cease-fire Efforts Continue Raw: Corruption Trial Begins for Former Va Gov. The Carbon Trap: US Exports Global Warming UN Security Council Calls for Gaza Cease-fire Traditional African Dishes Teach Healthy Eating 13 Struck by Lightning on Calif. Beach Baseball Hall of Famers Inducted Israel, Hamas Trade Fire Despite Truce in Gaza Italy's Nibali Set to Win First Tour De France Raw: Shipwrecked Concordia Completes Last Voyage Raw: Sea Turtle Hatchlings Emerge From Nest Raw: Massive Dust Storm Covers Phoenix 12-hour Cease-fire in Gaza Fighting Begins Raw: Bolivian Dancers Attempt to Break Record Raw: Israel, Palestine Supporters Rally in US Raw: Air Algerie Flight 5017 Wreckage Virginia Governor Tours Tornado Aftermath Judge Faces Heat Over Offer to Help Migrant Kids Kangaroo Goes Missing in Oklahoma More M17 Bodies Return, Sanctions on Russia Grow
NDN Video
'Hunger Games: Mockingjay Part 1' Sneak Peek GMA: Dog passes out from excitment to see owner Chapter Two: Designing for Naomi Watts Baseball Hall of Famers Inducted Florida Keys Webcam Captures Turtles Hatching Morgan Freeman Sucks Down Helium on 'Tonight Show' Robin Wright Can Dance! (WATCH) She's Back! See Paris Hilton's New Carl's Jr. Ad Big Weekend For Atlanta Braves In Cooperstown - @TheBuzzeronFox Chapter Two: Becoming a first-time director What's Got Jack Black Freaking Out at Comic-Con? Doctors Remove 232 Teeth From Teen's Mouth Bradley Cooper Explains His Voice in 'Guardians of the Galaxy' Deja vu: Another NYPD officer choke-holding a suspect 'Fifty Shades of Grey': Watch the Super Sexy First Trailer Now! Reports: Ravens RB Ray Rice Suspended For 1st 2 Games Of The Season Air Algerie plane with 119 on board missing over Mali Diamond Stone, Malik Newman, Josh Jackson and others showcase talent Free Arturo - The World's Saddest Polar Bear A Look Back at Batman On Film Through The Years
Parade
Magazine

Click HERE to read all your Parade favorites including Hollywood Wire, Celebrity interviews and photo galleries, Food recipes and cooking tips, Games and lots more.