Turner -- who backs the elimination of nuclear weapons and weapons of mass destruction -- wanted to know whether the administration has considered ridding the world of weapons of mass destruction and supporting nuclear nonproliferation, rather than pursuing a missile defense program that would cost billions.
CNN: Security adviser says U.S. must be prepared for nuclear threats
He said the next stage was to confirm its exact identity using mass spectrometry and nuclear magnetic resonance analyses to produce it chemically on a larger scale.
While in that job he headed efforts to reduce threats to the United States from weapons of mass destruction, including nuclear, biological and chemical weapons.
Those white dwarf stars that find themselves near a "companion" star can draw material from their neighbour, building up to a critical mass and eventually sparking nuclear fusion again in a nova.
The Pilgrim Nuclear Power Station in Plymouth, Mass.
FORBES: This post was last updated on Monday, April 15 at 11 PM ET.
Buchholz, a physicist and a nuclear engineer, is an expert at something called accelerator mass spectrometry, an extraordinarily precise method of determining the chemical composition of materials.
Theory suggests that a certain type of giant, short-lived star can experience catastrophic collapse when the nuclear reactions at its core can no longer support its mass.
Clinton...find that the proliferation of nuclear, biological and chemical weapons ('weapons of mass destruction') and of the means of delivering such weapons, constitutes an unusual and extraordinary threat to the national security, foreign policy and economy of the United States, and hereby declare a national emergency to deal with that threat .
On November 14, 1994, by Executive Order 12938, the President declared a national emergency with respect to the unusual and extraordinary threat to the national security, foreign policy, and economy of the United States posed by the proliferation of nuclear, biological, and chemical weapons (weapons of mass destruction) and the means of delivering such weapons.
He also negotiated a limited nuclear test ban treaty that inhibited the proliferation of weapons of mass destruction.
Hitting the earth at 28, 000 mph an asteroid the size and mass of Apophis would pack the energy of 58, 000 Hiroshima nuclear bombs.
The second world war saw mass murder (in the Holocaust, notably) or wilful killing (the nuclear strike on Hiroshima, the firebombing of Dresden, the siege of Stalingrad) of tens of millions of non-combatants.
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