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Ultracold matter

Ultracold matter

Astronomy and physics dominate Science top ten

17 Dec 1999

Five breakthroughs in astronomy and physics have made Science magazine's top ten highlights of the year. Degenerate fermion gases, further evidence that the universe is flat, the discovery of two types of gamma-ray bursts, photonic crystals and the first independent confirmation of extra-solar planets all made the list. A special blunder of the year award was given to NASA for losing the Mars Climate Orbiter in a mix up between Imperial and metric units.

Confirmation that the universe is flat – expanding at just the right rate not to collapse – came from measurements of ripples in the cosmic background radiation left over from the big bang. Gamma-ray bursts have been one of the hottest topics in astrophysics in the 1990s and earlier this year astronomers found that a new ‘softer’ type of burst could be connected to supernovae explosions. Extrasolar planets have been another hot topic but until astronomers witnessed the dimming of light from star HD 209458 as it was eclipsed by a planet, all the evidence had been indirect.

In a degenerate fermion gas all the atoms occupy the lowest possible energy states, which leads to radical new quantum statistical properties. Science selected photonic crystals — structures that can trap and guide specific wavelengths of light — because of their potential for applications in the IT and telecommunications.

PhysicsWeb will be publish its own top ten highlights of 1999 next week.


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