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Tuesday, 21 February 2012

DIAMONDS ARE FOREVER...



Diamond star thrills astronomers

Twinkling in the sky is a diamond star of 10 billion trillion trillion
 carats, astronomers have discovered.The cosmic diamond is a chunk of crystallised carbon, 4,000 km across,
some 50 light-years from the Earth in the constellation Centaurus.
It's the compressed heart of an old star that was once bright like our
Sun but has since faded and shrunk.
Astronomers have decided to call the star "Lucy" after the Beatles song,
 Lucy in the Sky with Diamonds.
Twinkle twinkle
"You would need a jeweller's loupe the size of the Sun to grade this
diamond," says astronomer Travis Metcalfe, of the Harvard-Smithsonian
 Center for Astrophysics, who led the team of researchers that discovered it.
The diamond star completely outclasses the largest diamond on Earth,
 the 546-carat Golden Jubilee which was cut from a stone brought out
 of the Premier mine in South Africa.
The huge cosmic diamond - technically known as BPM 37093 - is actually
 a crystallised white dwarf. A white dwarf is the hot core of a star, left
over after the star uses up its nuclear fuel and dies. It is made mostly
 of carbon.
For more than four decades, astronomers have thought that the
interiors of white dwarfs crystallised, but obtaining direct evidence
 became possible only recently.
The white dwarf is not only radiant but also rings like a gigantic gong,
 undergoing constant pulsations.
"By measuring those pulsations, we were able to study the hidden
 interior of the white dwarf, just like seismograph measurements of
 earthquakes allow geologists to study the interior of the Earth.
"We figured out that the carbon interior of this white dwarf has
 solidified to form the galaxy's largest diamond," says Metcalfe.
Astronomers expect our Sun will become a white dwarf when it dies
 5 billion years from now. Some two billion years after that, the Sun's
ember core will crystallise as well, leaving a giant diamond in the
centre of the solar system.
"Our Sun will become a diamond that truly is forever," says Metcalfe. 
Twinkling in the sky is a diamond star of 10 billion trillion trillion carats, astronomers have discovered.The cosmic diamond is a chunk of crystallised carbon, 4,000 km across, some 50 light-years from the Earth in the constellation Centaurus.
It's the compressed heart of an old star that was once bright like our Sun but has since faded and shrunk.
Astronomers have decided to call the star "Lucy" after the Beatles song, Lucy in the Sky with Diamonds.
Twinkle twinkle
"You would need a jeweller's loupe the size of the Sun to grade this diamond," says astronomer Travis Metcalfe, of the Harvard-Smithsonian Center for Astrophysics, who led the team of researchers that discovered it.
The diamond star completely outclasses the largest diamond on Earth,
the 546-carat Golden Jubilee which was cut from a stone brought out
of the Premier mine in South Africa.
The huge cosmic diamond - technically known as BPM 37093 - is actually
a crystallised white dwarf. A white dwarf is the hot core of a star, left
 over after the star uses up its nuclear fuel and dies. It is made mostly
 of carbon.
For more than four decades, astronomers have thought that the
 interiors of white dwarfs crystallised, but obtaining direct evidence
became possible only recently.
The white dwarf is not only radiant but also rings like a gigantic gong,
 undergoing constant pulsations.
"By measuring those pulsations, we were able to study the hidden
interior of the white dwarf, just like seismograph measurements of
 earthquakes allow geologists to study the interior of the Earth.
"We figured out that the carbon interior of this white dwarf has
solidified to form the galaxy's largest diamond," says Metcalfe.
Astronomers expect our Sun will become a white dwarf when it dies
 5 billion years from now. Some two billion years after that, the Sun's
ember core will crystallise as well, leaving a giant diamond in the
centre of the solar system.
"Our Sun will become a diamond that truly is forever," says Metcalfe.