Top news for 2021-02-21

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Europe is recruiting astronauts. Here’s what it takes to become one

Researchers Warn: At Least 50% of COVID-19 Infections Are Transmitted by People Without Symptoms

On This Day In Space: May 25, 2008: NASA's Phoenix spacecraft lands on Mars

Studies Suggest People Who Had Covid-19 Should Get Single Vaccine Dose

Texas Blackouts Point to Coast-to-Coast Crises Waiting to Happen

NASA’s Ingenuity Helicopter Reports In From Mars

Astronomers Make a Weird Discovery: A Concentration of Smaller Black Holes Lurking Where They Expected a Single Massive Black Hole

Getting to Net Zero Carbon Emissions – and Even Net Negative – Is Surprisingly Feasible and Affordable

Mars Reconnaissance Orbiter Captured Perseverance During Descent to Red Planet

Natural Antifreeze: Ice-Binding Molecules Stop Ice Growth