The US space agency has said that cooperation with ISRO remains intact despite India doing "terrible thing" for creating about 400 pieces of orbital debris. Fast-moving debris, flying around the planet at some 8 km per second, poses an ever-growing threat to spacecraft and crew. The first 10 days are critical and those have passed.
"We have no option but to clear space debris from Low Earth Orbit", says ClearSpace CEO Luc Piguet in a statement published by EPFL on Friday.
The DRDO chief said that the weapon had the capability to intercept satellites at an orbit of 1,000 km, but keeping all the factors in mind, India chose a much lower orbit for Mission Shakti to avoid the threat of debris to global space assets.
His remarks come days after NASA raised concerns about the spread of debris from the A-SAT test India conducted under Mission Shakti.
"As per our simulations, there were no possibilities of hitting the International Space Station with debris from the satellite", he added. "That kind of activity is not compatible with the future of human spaceflight that we need to see have happen", he said.
India shot down one of its satellites in space on March 27 with an anti-satellite (A-SAT) missile to demonstrate this complex capability, joining the elite club of countries - the US, Russia and China - which have such capabilities. "The best way of defence is to have deterrence".
Amid political debate on when the project was initiated, Reddy said the first discussion on the A-SAT test started in 2014 and the formal detailed presentation was made in 2016.
The DRDO chief said the weapon has boosted the country's defence. "Space debris is composed of satellites, parts of launch vehicles, etc".
Prime Minister Narendra Modi announced on March 27 that India had achieved a "historic feat" by shooting down its own low-orbit satellite with a ground-to-space missile, making the country a "space power".
However, Pentagon has earlier strongly denied the reports that the United States spied on India's anti-satellite or ASAT missile test by sending a reconnaissance aircraft from its base in Diego Garcia in the Indian Ocean to monitor the development.
These includes about 10,000 pieces of space debris, of which almost 3,000 were created by a Chinese anti-satellite test.