The ISS in perspective, and bad news for Venusians

Two new papers challenge the discovery of phosphine in Venus’ atmosphere. The original announcement of the detection of phosphine—a chemical associated with life—came in September 2020. Since then, other scientists have challenged the findings. One of the new papers argues that sulfur dioxide could be producing the phosphine signal. New observations of Venus are planned in the coming weeks and months. Pictured: Venus’ upper clouds imaged in infrared by JAXA’s Akatsuki spacecraft. Image credit: JAXA/DARTS/ISAS.

The first 2 of 3 new Mars missions arrive next week. The United Arab Emirates’ Hope spacecraft enters orbit on Tuesday, and China’s Tianwen-1 enters orbit Wednesday. Both launched in mid-2020. Tianwen-1 includes a rover; the rover will remain attached for now with a landing planned for May. For the latest news, see our Mars 2021 Missions Arrival Guide.

SpaceX plans to launch 4 private astronauts into orbit on a 4-day mission in late 2021. Tech entrepreneur Jared Isaacman purchased the flight at an undisclosed price. His fellow passengers will be a healthcare worker, the winner of a charity raffle, and a contest winner from a pool of people who use his company’s software to launch an online store.

SpaceX’s big Starship rocket flew again, but didn’t stick its landing. The company, which plans to use Starship to send humans to Mars, is conducting high-altitude test flights in Texas. This one ended the way the first did, with a spectacular crash-landing. Another test vehicle is already waiting in the wings. Learn how NASA and SpaceX rely on one another for success.

NASA astronauts Michael Hopkins and Victor Glover completed a second spacewalk outside the International Space Station. The crew members, who arrived at the ISS via SpaceX’s second astronaut flight in November, wrapped up battery replacement work that began in 2017 and installed a new high-definition camera.

The Space Launch System will conduct a second test-firing of its engines. NASA says a faulty wire harness and overly conservative test parameters stopped the first test of the big rocket. The second test is scheduled for the week of 21 February.

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