US space agency NASA has blocked Chinese citizens with valid US visas from its facilities - a move that effectively bars them from working at one of the most respected space research centres. Chinese nationals, who could only work at NASA as contractors or students contributing to research, found out on 5 September that they had lost all access to NASA's systems and facilities, Bloomberg news reported, citing sources.

NASA confirmed this, stating that Chinese nationals would be restricted from using the agency's 'facilities, materials, and networks to ensure the security of our work'. China's accelerated space programme has alarmed the US, intensifying competition between the two leading economies.

Chinese astronauts are already excluded from the International Space Station (ISS) due to a US ban on data sharing with China. This latest restriction adds to the decline in scientific collaboration driven by national security fears.

The growing suspicions between the US and China have complicated the visa processes for Chinese students, especially in science and technology fields. Recent allegations of espionage involving Chinese nationals have further strained relations. According to sources, affected Chinese nationals suddenly found themselves locked out of NASA’s data systems and barred from meetings associated with their work.

NASA’s press secretary confirmed actions were taken involving Chinese nationals, including restricting access to facilities. As both nations race to achieve technological superiority, each is wary of the other's ambitions. The competition extends beyond lunar exploration, focusing also on future resource control on the Moon.

Senator Ted Cruz recently emphasized the necessity for the US to establish a presence on the Moon before China, citing the significant risks posed by adversarial dominance in space capabilities. The Moon, rich in minerals like rare earths, iron, and helium, represents a crucial area of contention as the space race continues.