In 1974, astronomers sent a call out into the cosmos from a massive telescope in Puerto Rico. The anniversary of the message brings reflections on a new missive to the stars and grief for a lost ...
Aggregated measurements from millions of smartphones could be used to create a comprehensive map of the Earth's ionosphere, ...
A 3D map of our cosmic neighborhood has revealed hot and cold regions as well as an "escape tunnel" from our local bubble.
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