¼®ÇаúÀÇ ¸¸³²: J. P. Ostriker
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Heart of Darkness: ¾ÏÈæÀÇ Á¤Ã¼
It is all around us; it fills the universe and yet we cannot
see it, touch it or even define what it is. Astronomers the world over are still
trying to explain this elusive presence in the Universe a presence with nothing
except its weight to prove its existence. So far all it has is a name: dark
matter.
In the last 100 years, an extraordinary amount has been
discovered about the universe. It wasn¡®t until the 20th century that astronomers discovered that
ours was not the only galaxy, but one of many. Later still we were able to use
increasingly sophisticated telescopes that allowed us to see so far out into
space that we can actually look back in time.
But this increased knowledge brings with it even deeper
mysteries, as Professor Ostriker explains:
¡°Once
we realized we could calculate the weights of planets and stars by measuring
their gravitational pull, we started to realize that there was much more matter
in the Universe than can be accounted for by the visible objects alone,¡± he said.
¡°There
are elements particles of some
kind perhaps that dont shine, dont
react with anything and yet they exist in the Universe. It seems to be their gravity
that is the glue that holds galaxies together.¡±
¡°More
recently still, we have discovered strong evidence to suggest that alongside
this dark matter is an even stronger component of dark energy, which dominates
gravity and is causing the universe to expand at an ever accelerating rate.
What this means for the future of this Universe is something we can still only
guess at.¡±
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