AstroSat is India’s first multi-wavelength space observatory. ISRO launched it on 28 September 2015 by PSLV-C30, and it completed 10 years in orbit on 28 September 2025. For Science and Technology current affairs, this matters because AstroSat represents India’s capability in space-based astronomy. For exams, it should be linked with ISRO, PSLV-C30, and multi-wavelength observation.

The key feature of AstroSat is its ability to observe simultaneously in ultraviolet, optical, and X-ray wavelengths. This means one observatory can study celestial sources across different energy bands. In prelims, the facts most likely to be tested are its identity as India’s first multi-wavelength space observatory, its launch vehicle, and the wavelength bands it covers. For static GK, it connects with the electromagnetic spectrum, scientific satellites, space observatories, and major achievements of ISRO.

AstroSat has contributed to the study of pulsars, black holes, neutron stars, and distant galaxies. It is also associated with the detection of ultraviolet light from a galaxy 9.3 billion light-years away. AstroSat has contributed to more than 1,600 research publications. So this is not just a launch-date fact; it is an example of India’s long-term scientific mission capability, space-based astronomy, and research-oriented satellite use. For RAS and UPSC preparation, place AstroSat under Science and Technology as well as the broader development of India’s space programme.