vicki holt

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Nova Centauri 2013 Now visible to the unaided eye (southern hemisphere) Copyright: Yuri Beletski

WIRED Space Photo of the Day 2013 | WIRED

Jan. 19, 2014: Solar X-Flare<p>The largest sunspot group of the solar cycle unleashed a large (X1.2 class) flare just when it was facing right towards …

APOD: Naked Eye Nova Centauri (2013 Dec 07) Image Credit & Copyright: Yuri Beletsky (Las Campanas Observatory, Carnegie Institution) http://apod.nasa.gov/apod/ap131207.html Explanation: Brightest stellar beacons of the constellation Centaurus, Alpha and Beta Centauri are easy to spot from the southern hemisphere. For now, so is new naked eye Nova Centauri 2013. In this night skyscape recorded near Las Campanas Observatory in the Chilean southern Atacama desert on December 5, the new star joins the old in the expansive constellation, seen at early morning hours through a greenish airglow. Caught by nova hunter John Seach from Australia on December 2 as it approached near naked eye brightness, Nova Cen 2013 has been spectroscopically identified as a classical nova, an interacting binary star system composed of a dense, hot white dwarf and cool, giant companion. Material from the companion star builds up as it falls onto the white dwarf's surface triggering a thermonuclear event. The cataclysmic blast results in a drastic increase in brightness and an expanding shell of debris. The stars are not destroyed, though. Classical novae are thought to recur when the flow of material onto the white dwarf eventually resumes and produces another outburst. http://www.lco.cl/ http://carnegiescience.edu/ Starship Asterisk* • APOD Discussion Page http://asterisk.apod.com/discuss_apod.php?date=131207 #APOD

Nelson Mandela, 1918-2013

Honoring one of the world’s greatest leaders.<p>Nelson Mandela, former President of South Africa, Nobel Peace Prize recipient, and the transformational civil rights leader largely responsible for the dismantling of apartheid, died today at the age of 95.<p>Mandela was one of the world’s most celebrated …

Nelson Mandela: Letters to Loved Ones From Prison

In the 27 years that Nelson Mandela spent imprisoned in South Africa, he wrote letters to his loved ones.<p>Razia Saleh of the Nelson Mandela Foundation …

Inside The Tiny Prison Cell That Held Nelson Mandela For Nearly 20 Years

Former South African President Nelson Mandela died today at the age of 95, after succumbing to a long battle with a lung infection.<p>He served as the first black president of South Africa and brought an end to apartheid, but his story of struggle began decades before — when he was arrested and …

Nelson Mandela: An Indispensable Life in Pictures

Mandela was born on July 18, 1918, in the village of Mviza in South Africa’s Eastern Cape. His father was a counselor to<p>... VIEW MORE<p>Eyedea …

Nelson Mandela (1918-2013)

A look back at the life and career of Nelson Mandela. Narrated by TIME's former managing editor, Richard Stengel

Nelson Mandela, South Africa's first black president, dies aged 95

Nelson Mandela, the towering figure of Africa's struggle for freedom and a hero to millions around the world, has died at the age of 95.<p>South Africa's first black president died in the company of his family at home in Johannesburg after years of declining health that had caused him to withdraw from …

Nelson Mandela, 1918–2013: Remembering an Icon of Freedom

Nelson Mandela was always uncomfortable talking about his own death. But not because he was afraid or in doubt. He was uncomfortable because he …

Nelson Mandela dies at 95

South African president Jacob Zuma made the announcement at a news conference late Thursday, saying, "We've lost our greatest son."<p>Mandela's death …

Nelson Mandela in Pictures

Discovery of oldest human DNA in Spanish cave sheds light on evolution

Researchers have read strands of ancient DNA teased from the thigh bone of an early human who died 400,000 years ago in what is now northern Spain.<p>The genetic material was pieced together from a clutch of cells found in bone fragments – the oldest human remains ever to yield their genetic code.<p>The …

Forget the Asian Carp. Here’s a New Great Lakes Invasive Species to Worry About

Conservationists and wildlife officials have been policing the porous border between the Mississippi watershed and the Great Lakes for years. Their …

Neanderthals Were Neat Freaks: Inside the Original Man Caves

Free-association test: in the old sitcom “The Odd Couple,” Felix was the fussy neat freak who sipped wine, listened to opera and straightened up …