Dark energy is an unknown form of energy which is hypothesized to permeate all of space, tending to accelerate the expansion of the universe. SPACE'S DEEPEST SECRETS Tuesdays 9/8c on Science...
========== ♪♪Narrator: IN 1998,A YOUNG SCIENTIST
NAMED SAUL PERLMUTTERWAS THINKING
SOME VERY BIG THOUGHTS, INDEED.Perlmutter: THE QUESTION
THAT'S BEEN REALLY EXCITING MEIS WHETHER THE UNIVERSE
WILL LAST FOREVER.DO WE LIVE IN A UNIVERSE
THAT IS INFINITE,OR IT WILL SOMEDAY
COME TO AN END?THE TWO BIG OPTIONS AT THAT TIME
WERE THAT THE UNIVERSECOULD EXPAND FOREVER,BUT JUST SLOW AND SLOW AND SLOW,
BUT FOREVER BE EXPANDING,OR, IF THERE WAS ENOUGH STUFF
IN THE UNIVERSETO GRAVITATIONALLY ATTRACT IT,IT COULD SLOW TO A HALTAND THEN COLLAPSE
AND COME TO AN END.Narrator:
PERLMUTTER WAS MEASURINGTHE WAY THE UNIVERSE
WAS EXPANDINGBY OBSERVING EXPLODING STARS
CALLED SUPERNOVAE.ONE PARTICULAR KIND OF SUPERNOVA
ALWAYS EXPLODES THE SAME WAYBECAUSE IT WAITS UNTIL
JUST A CRITICAL AMOUNT ...
