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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 ...

NASA’s Roman Space Telescope has been cleared for final launch preparations ahead of a targeted August 30 liftoff aboard SpaceX’s Falcon Heavy. The powerful new observatory will probe cosmic expansion ...

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 ...