Meg Urry: All-female spacewalk a ludicrous casualty of all-male assumptions

March is Women’s History Month, so it would have been a great moment for the first all-women spacewalk, with astronauts Anne McClain and Christina Koch. That was NASA’s plan this week, until it realized it had a problem: two women astronauts, but only one space suit available in their size. So instead of McClain, a man — Nick Hague — will join Koch for the spacewalk, wearing the large suit that is flight-ready.