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Support teams work around the SpaceX Crew Dragon Resilience spacecraft shortly after it landed with NASA astronauts Mike Hopkins, Shannon Walker, and Victor Glover, and Japan Aerospace Exploration Agency (JAXA) astronaut Soichi Noguchi aboard in the Gulf of Mexico off the coast of Panama City, Florida, Sunday, May 2, 2021. (Bill Ingalls / NASA via AP)

SpaceX safely returned four astronauts from the International Space Station on Sunday, making the first U.S. crew splashdown in darkness since the Apollo 8 moonshot.

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This image provided by NASA, astronauts from SpaceX join the astronauts of the International Space Station for an interview on Saturday, April 24, 2021. A recycled SpaceX capsule carrying four astronauts has arrived at the International Space Station, a day after launching from Florida. The Dragon capsule docked autonomously with the orbiting outpost on Saturday. (NASA via AP)

The International Space Station’s population swelled to 11 on Saturday with the jubilant arrival of SpaceX’s third crew capsule in less than a year. It’s the biggest crowd up there in more than a decade.

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SpaceX's Falcon 9, left, and Blue Origin's New Shepard. (SpaceX / Flickr, Franke360 / Wikimedia)

Last month, Elon Musk's SpaceX successfully landed one of its Falcon 9 rockets back onto its launch pad. In November, Jeff Bezos’ company Blue Origin landed its sub-orbital capsule New Shepard. Space enthusiast and Fermilab physicist Don Lincoln recently wrote a column on the Musk versus Bezos competition and shares his insights.