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American Physics Dreams Deferred
from the New York Times (Registration Required)
When three American astronomers won the Nobel Prize in Physics last year, for discovering that the expansion of the universe was speeding up in defiance of cosmic gravity--as if change fell out of your pockets onto the ceiling--it reaffirmed dark energy, the glibly named culprit behind this behavior, as the great cosmic surprise and mystery of our time.
And it underscored the case, long urged by American astronomers, for a NASA mission to measure dark energy--to determine, for example, whether the cosmos would expand forever or whether, perhaps, there might be something wrong with our understanding of gravity.
In 2019, a spacecraft known as Euclid will begin such a mission to study dark energy. But it is being launched by the European Space Agency, not NASA, with American astronomers serving only as very junior partners, contributing $20 million and some infrared sensors. For some scientists, this represents an ingenious solution, allowing American astronomers access to the kind of data they will not be able to obtain on their own until NASA can mount its own, more ambitious mission in 2024.