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A major international effort has produced an ultra-precise measurement of the Universe’s expansion rate, confirming it’s faster than early-Universe models predict. By linking multiple ...

Einstein’s abandoned cosmological constant made a spectacular comeback when astronomers discovered that the universe’s expansion is accelerating. It now sits at the heart of our best cosmological ...

This article predates the current owners of Science Blog. It has not been reviewed under the current editorial process and is kept as part of the archive. The primary techniques for charting cosmic ...