The US space agency Nasa has banned Chinese nationals from working on its space programs and accessing its facilities, citing national security concerns amid an accelerating space race between the two nations.

• Chinese nationals lost access to Nasa’s systems and facilities on September 5.
• Bethany Stevens, Nasa’s press secretary, confirmed the "internal action" restricting physical and cybersecurity access.
• The ban is part of a broader decline in scientific collaboration due to increasing suspicion, with both countries vying to be the first to send crews back to the Moon and control its valuable resources.