"The reports that some of the space debris created by this test has been pushed above the apogee of the International Space Station (ISS) increasing the risk of collision are deeply worrying", it added. It did not, however, acknowledge that some debris may pose a threat to the ISS on its path back to Earth.
A day after India successfully carried out its ASAT test, acting USA defence secretary Patrick Shanahan warned that the event could create a "mess" in space but said Washington was still studying the impact.
NASA said the long-duration flight was "in the best interest of the agency's needs to ensure continued access and better utilization" of the space station.
But 24 of the pieces "are going above the apogee of the International Space Station", said Bridenstine.More news: ‘Marxist’ Corbyn ‘extremely dangerous’, says minister as Government seeks deal
Should the August target be confirmed and the test be a success, Boeing will send up a crew in "late 2019", meaning that it will be well into 2020 before the company's space taxi will perform its first operational mission to the ISS.
"While the risk went up 44 per cent, our astronauts are still safe".
The head of NASA, Jim Bridenstine, is not happy with how other world leaders are treating space.
Officially, the company says the orbital flight test delay from April to August has come because more time is needed to allow its engineers to test and validate Starliner's performance.
He had also pointed out that China which did such a test had also created debris some of which are yet to come down to earth and hence were risky.More news: Ezequiel GARAY scores match victor for Valencia against Real Madrid
"Destroying satellites orbiting in altitude bands that are heavily used for both military and civil satellites also can have ripple effects, producing unsafe clouds of debris that could stay in orbit for decades or centuries, disabling or destroying any satellites they collide with", said Grego in a statement.
Some have suggested constructing smaller satellites that could orbit at lower altitudes and escape the potentially deadly debris cloud above. The risk is expected to eventually return to normal.
India is the fourth country to have carried out such a test.
US Strategic Command's Joint Force Space Component Command (JFSCC) had said earlier that 250 pieces of debris associated with an Indian ASAT launch last Wednesday were being actively tracked.
Media captionIs India's prime minister right when he calls his country a space superpower? Using a hit-to-kill interceptor to destroy a satellite in low Earth orbit is a very similar task to destroying a Pakistani nuclear-armed missile on a ballistic trajectory outside of Earth's atmosphere.More news: Malignaggi Strikes Out At Lobov During Media Event For BKFC