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40 years ago today, Mikhail Gorbachev became leader of the Soviet Union. His policies of glasnost ("openness") and perestroika ("restructuring") and his negotiations with ...

Mar. 11, 2025 — A new study presents a compelling new model for the formation of super-Earths and mini-Neptunes -- planets that are 1 to 4 times the size of Earth and among the most common in ...