Published: 27 September 2025ISROScience & Technology
ISRO's AstroSat Completes 10 Years in Orbit — India's First Multi-Wavelength Space Observatory
AstroSat, India's first dedicated multi-wavelength space astronomy observatory, completed 10 years in orbit on September 28, 2025. Launched on September 28, 2015, by PSLV-C30 (XL) from Sriharikota, the satellite has far exceeded its designed mission life of five years and continues to provide scientific data.
AstroSat can simultaneously observe in the visible, ultraviolet, low-energy and high-energy X-ray regions of the electromagnetic spectrum from a single platform — a capability rare among global observatories. Over 10 years, it has generated over 500 scientific publications and attracted more than 2,000 observation proposals from the global scientific community. Key discoveries include detecting far-UV photons from nine billion light-years away, revealing the Butterfly Nebula's emissions extending three times beyond previous estimates, and studying black holes, neutron stars, and Proxima Centauri.
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Frequently asked questions
When did AstroSat complete 10 years in orbit?
**AstroSat**, India's first multi-wavelength space observatory, completed **10 years in orbit** on **28 September 2025**, having been launched by ISRO on 28 September 2015 from Sriharikota using the PSLV-C30 rocket.
What is AstroSat and what makes it special?
**AstroSat** is India's first dedicated **multi-wavelength space astronomy observatory**, launched by ISRO in 2015. It can simultaneously observe celestial objects in **ultraviolet, optical, low and high energy X-ray** wavebands, making it unique among Indian satellites.
What major discoveries has ISRO's AstroSat made?
**AstroSat** has made significant contributions to astronomy including studying **pulsars, black holes, neutron stars**, and distant galaxies. Notably, it detected **ultraviolet light from a galaxy 9.3 billion light-years away**, contributing to research on galaxy evolution.
Which rocket launched AstroSat and from where?
**AstroSat** was launched by ISRO on **28 September 2015** using the **PSLV-C30** rocket from the **Satish Dhawan Space Centre, Sriharikota**. It was placed in a 650 km circular orbit.
How long has AstroSat been operational?
**AstroSat** has been operational for **10 years** as of September 2025, far exceeding its initial designed life. ISRO's astronomy satellite continues to function and contribute to global astrophysics research.
