The launch of the Chandra X-Ray Observatory (India, 1999), marked India's first major contribution to international space exploration. It was a historic moment for the Indian Space Research Organisation (ISRO) as the successful launch of this observatory provided India with an opportunity to extend its reach into deep space.

Chandra X-ray Observatory (CXO), is a satellite-based observatory that was launched on July 23rd, 1999 aboard Space Shuttle Columbia. It is the fourth of the Great Observatories Program of NASA, after the Hubble Space Telescope (HST), the Compton Gamma Ray Observatory (CGRO), and the Extreme Ultraviolet Explorer (EUVE). The Chandra mission was dedicated to the memory of Subrahmanyan Chandrasekhar, a Nobel Prize-winning physicist. The satellite was named in his honor.

CXO is designed to explore the universe in X-ray light and has revolutionized our understanding of the universe, providing us with insights into the nature of black holes, supernovae, and other phenomena. Its high-resolution X-ray imaging capabilities have enabled scientists to observe details not visible in other wavelengths, allowing them to probe the structure and dynamics of the universe, and providing us with a much better understanding of how it evolved.

The Chandra X-Ray Observatory was designed and developed by ISRO, with collaboration from the National Aeronautics and Space Administration (NASA). ISRO provided the hardware and software, while NASA provided the launch vehicle and the mission operations support.

The Chandra mission has been a major success and has enabled us to observe phenomena that were previously unknown or unverifiable. It has provided us with a wealth of data that has been used in countless scientific studies and discoveries. In addition, the Chandra mission has also served to enhance India's reputation as a leader in space exploration.

The Chandra X-Ray Observatory has been a major boon to the Indian space program and has enabled the country to make a major contribution to international space exploration. By providing us with data that has been used to make important discoveries, Chandra has been an invaluable asset to the Indian space program. The successful launch of Chandra X-Ray Observatory (India, 1999) was a major milestone in India's space exploration history and a testament to the country's commitment to advancing space research.