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A black hole is a region of spacetime from which gravity prevents anything, including light, from escaping. The theory of general relativity predicts that a sufficiently compact mass will deform spacetime to form a black hole. Around a black hole, there is a mathematically defined surface called an event horizon that marks the point of no return. The hole is called 'black' because it absorbs all the light that hits the horizon, reflecting nothing, just like a perfect black body in thermodynamics. 

Science,Physics,Chemistry,The Universe

Inside a Black Hole

A black hole is a region of spacetime from which gravity prevents anything, including light, from escaping. The theory of general relativity predicts that a sufficiently compact mass will deform spacetime to form a black hole. Around a black hole, there is a mathematically defined surface called an event horizon that marks the point of no return. The hole is called 'black' because it absorbs all the light that hits the horizon, reflecting nothing, just like a perfect black body in thermodynamics.
August 29, 2014 - [ 1 part ]
Gold is a chemical element with the symbol Au and atomic number 79. It is a dense, soft, malleable, and ductile metal with an attractive, bright yellow color and luster that is maintained without tarnishing in air or water. Chemically, gold is a transition metal and a group 11 element. It is one of the least reactive chemical elements, solid under standard conditions. The metal therefore occurs often in free elemental (native) form, as nuggets or grains in rocks, in veins and in alluvial deposits. Less commonly, it occurs in minerals as gold compounds, such as with tellurium as calaverite, sylvanite and krennerite.

History,Science,Places,Geology,Chemistry,The Universe,Economics

Gold

Gold is a chemical element with the symbol Au and atomic number 79. It is a dense, soft, malleable, and ductile metal with an attractive, bright yellow color and luster that is maintained without tarnishing in air or water. Chemically, gold is a transition metal and a group 11 element. It is one of the least reactive chemical elements, solid under standard conditions. The metal therefore occurs often in free elemental (native) form, as nuggets or grains in rocks, in veins and in alluvial deposits. Less commonly, it occurs in minerals as gold compounds, such as with tellurium as calaverite, sylvanite and krennerite.
August 29, 2014 - [ 1 part ]


The Universe

The Universe - Deep Space Disasters

May 31, 2014 - [ 1 part ]
It is commonly theorized that the universe began with the Big Bang 13.7 billion years ago. But since we can only see as far as light has traveled in that time, we can't actually make out the edge of the universe. Could it be that the universe is infinite? Is there any way to find out what the shape of the universe really is? Can we find the edge, discover what might lie beyond it, and perhaps even discover a universe next to ours? 

Physics,The Universe

Is There an Edge to the Universe

It is commonly theorized that the universe began with the Big Bang 13.7 billion years ago. But since we can only see as far as light has traveled in that time, we can't actually make out the edge of the universe. Could it be that the universe is infinite? Is there any way to find out what the shape of the universe really is? Can we find the edge, discover what might lie beyond it, and perhaps even discover a universe next to ours?
January 24, 2014 - [ 1 part ]
Stephen Hawking

Science,People,Physics,The Universe

Master Of The Universe

Stephen Hawking
January 4, 2014 - [ 1 part ]
Birth of the Earth

History,Science,Geology,Physics,The Universe

How The Earth Was Made Birth of the Earth

Birth of the Earth
December 28, 2013 - [ 1 part ]
Neil Armstrong, Apollo 11 Commander and first person to walk on the moon, guides us through the history of the National Aeronautics and Space Administration in the half-century since its establishment in 1958. Produced by NASA TV, 2008.

History,Science,The Future,The Universe,Machinery

Armstrong Hosts NASA 50th Anniversary

Neil Armstrong, Apollo 11 Commander and first person to walk on the moon, guides us through the history of the National Aeronautics and Space Administration in the half-century since its establishment in 1958. Produced by NASA TV, 2008.
August 31, 2012 - [ 1 part ]
A discussion on the life of Stephen Hawking and the topic of information loss in a black hole. 

Science,Physics,The Universe

The Hawking Paradox

A discussion on the life of Stephen Hawking and the topic of information loss in a black hole.
March 14, 2012 - [ 5 parts ]
There was a time, not so long ago, when science seemed to understand how the universe worked. Everything us, the Earth, the stars and even exotic-sounding supernovae was made of atoms which were all created at time-zero: the Big Bang. In between the atoms was nothing, a void: quite literally, 'space'.  But recently things have started to unravel. There is, it seems, a lot more to the universe than meets the eye. According to the best estimates, we only really know what about 4% of it is made of. But if only 4% is made of atoms, what about the rest? The rest is made of mysterious entities about which very little is understood, with equally mysterious names: dark matter and dark energy.

Science,Physics,Chemistry,The Universe

Most of our Universe is Missing

There was a time, not so long ago, when science seemed to understand how the universe worked. Everything us, the Earth, the stars and even exotic-sounding supernovae was made of atoms which were all created at time-zero: the Big Bang. In between the atoms was nothing, a void: quite literally, 'space'. But recently things have started to unravel. There is, it seems, a lot more to the universe than meets the eye. According to the best estimates, we only really know what about 4% of it is made of. But if only 4% is made of atoms, what about the rest? The rest is made of mysterious entities about which very little is understood, with equally mysterious names: dark matter and dark energy.
March 14, 2012 - [ 5 parts ]
This NASA documentary explains the complexity of planning a lunar mission trajectory. Includes mission analysis, new mathematical techniques, hybrid computers, mission operational plan, and real-time support for the NASA JSC's Mission Operations Control Room.

Science,Physics,The Universe,Mathematics

Fly me to the Moon and back

This NASA documentary explains the complexity of planning a lunar mission trajectory. Includes mission analysis, new mathematical techniques, hybrid computers, mission operational plan, and real-time support for the NASA JSC's Mission Operations Control Room.
January 20, 2012 - [ 1 part ]