On March 27, Prime Minister Narendra Modi announced that India had tested an anti-satellite weapon by firing a rocket at an Indian satellite in low-Earth orbit.The Indian government was quick to assert that debris from the test would fall safely to Earth and not pose a threat in space.But this week, the head of the US space agency, NASA, has said that this is not true and that some of the pieces from the satellite India destroyed could threaten the International Space Station.NASA administrator Jim Bridenstein noted that India’s test had created 60 pieces of debris “big enough to track”, and “24 of which rise higher than the ISS’s orbit around Earth”.