China Launches Shenzhou 23, Sends Three Astronauts to Space Station

China sent three astronauts to its Tiangong space station on Sunday, May 24, aboard the Shenzhou 23 spacecraft — and this one's got a few angles worth paying attention to.

First, the basics: the spacecraft blasted off from the Jiuquan Satellite Launch Center in northwestern China. It lifted off atop a Long March-2F carrier rocket at 11:08 p.m. Beijing time. Everything went smoothly — Li Benqi, an official at the center, called the launch "a complete success."

Who's on board?

The astronauts on the mission are Zhu Yangzhu, the commander, Zhang Zhiyuan, and Lai Ka-ying, also identified by Chinese authorities as Li Jiaying using the Mandarin transliteration of her name. Lai is the headline name here: she was born and raised in Hong Kong and has a doctoral degree in computer forensics, and is the first astronaut from the city on a space mission. She's also the country's fourth female astronaut to travel to space, according to Chinese state media. Notably, before being selected, Zhang was an air force pilot while Li worked in the Hong Kong Police Force.

The big deal: a year in space

Here's where this mission really stands out. One crew member aboard the Shenzhou 23 is expected to remain in space for one year, which would be among the world's longest single stays in space. That's a huge deal physiologically — your body wasn't designed for zero gravity that long. The astronaut's mission is to "explore human adaptability and performance limits" in long-duration spaceflight environments, state media reported.

There's a clever logistical reason for this unusual arrangement: Shenzhou 24, due to launch later this year, will send a Pakistani astronaut to Tiangong for a short-duration visit. This first international visitor will arrive on Shenzhou 24 but then take the seat of one of the Shenzhou 23 astronauts when the spacecraft returns to Earth — leaving one Shenzhou 23 astronaut to complete a year in orbit. The selection of which astronaut stays will be determined later in the mission based on physical and psychological evaluations.

What are they actually doing up there?

The Shenzhou 23 crew will conduct more than 100 new science and application projects, focusing on frontier fields such as space life science, materials science, microgravity fluid physics, aerospace medicine, and new space technologies. In the field of space life sciences, the mission will use zebrafish and mouse embryos, as well as stem cell-derived "artificial embryos," to establish a space embryonic research system. They're also picking up where the previous crew left off: they are expected to complete an in-orbit rotation with the crew of Shenzhou 21, who has been at the Tiangong space station for more than 200 days.

Why does this matter to you?

Because it's a direct window into a very real space race. China has carried out multiple missions to the Tiangong space station, developed after China was effectively excluded from the International Space Station on U.S. concerns over national security. In other words, China built its own station from scratch after being locked out — and it's now running year-long missions and welcoming international visitors. The launch comes as China prepares for its first crewed lunar landing by 2030, while the U.S. is seen as China's top space rival, with NASA aiming to land astronauts on the lunar surface in 2028. Two years apart. The race to the Moon is very much on — and whoever gets there first will have a major claim to scientific and geopolitical prestige for years to come.