The successful test of India's brand new anti-satellite weapon last month has drawn criticism from NASA and Pakistan, but New Delhi does not plan to stop yet.
"There was a risk for 10 days and we have crossed that period", he told a press conference.
Reddy said according to Indian simulations, there were no possibilities of hitting the International Space Station with A-SAT debris.
Speaking further on the main objective of the test, Reddy said, "Space has gained importance in the military domain".
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.
On March 27, India conducted its first successfull test of an Anti-Satellite missile becoming the fourth country in the world after Russia, USA and China to posses this technology.
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Attacking the Left parties, he said, they consider their "party's constitution bigger than that of the country's". Taking to Twitter, the Congress chief said, "You can run Mr Modi but you can't hide".
When asked about the need for a space command and serial production of the A-Sat, he said, "It is for the government to take a decision". "This test won't breach any global law or treaties", said Prime Minister Narendra Modi. The US expressed concerns about the spread of debris from the test. "Best way of defence is to have deterrence".
The DRDO chief said the weapon has boosted the country's defence.
The government on Wednesday declined to comment on the U.S. space agency NASA evaluation that India's anti-satellite weapon test a week ago contributed To the creation of 400 pieces of space debris which may pose a threat to the International Space Station.
Prime Minister Narendra Modi had hailed the A-SAT test's success as "an unprecedented achievement" that makes India a "space power". Some 150 scientists worked round-the-clock and some 2,000 components were sourced from 50 private industries.
Deputy National Security Advisor Pankaj Saran, who was present during the briefing, in response to a question said, "We do keep in touch with some of our friendly nations and we were in touch with them about this mission".
Asked if India has informed United States of America or other nations about the test, Saran admitted that India was "in touch" with other space powers. However, the agency did not revealed the number of petitions received by it in the first five days.