भारत द्वारा प्रमोचित खगोलीय वेधशाला, ‘ऐस्ट्रोसैट (Astrosat)’ के संदर्भ में निम्नलिखित कथनों में से कौन-सा/से सही है/हैं?
- 1.USA और रूस के अलावा केवल भारत एकमात्र ऐसा देश है जिसने अंतरिक्ष में उसी प्रकार की वेधशाला प्रमोचित की है।
- 2.ऐस्ट्रोसैट 2000 किलोग्राम का एक उपग्रह है, जो पृथ्वी की सतह के ऊपर 1650 किलोमीटर पर एक कक्षा में स्थापित है।
नीचे दिए गए कूट का प्रयोग कर सही उत्तर चुनिए।
Read this question in English
With reference to 'Astrosat', the astronomical observatory launched by India, which of the following statements is/are correct?
1. Other than USA and Russia, India is the only country to have launched a similar observatory into space.
2. Astrosat is a 2000 kg satellite placed in an orbit at 1650 km above the surface of the Earth.
Select the correct answer using the code given below.
(a) 1 only · (b) 2 only · (c) Both 1 and 2 · (d) Neither 1 nor 2
उत्तर और व्याख्या · explanation in English
Answer: (d) न तो 1, न ही 2
Neither statement is correct. Astrosat weighed about 1,513 kg at lift-off and was put into a 650 km orbit, not 2,000 kg and 1,650 km; and India is not the only country beyond the USA and Russia to have launched a space observatory, since Europe's ESA, for one, had already done so.
- ✗ 1. Other countries and agencies have launched space observatories. For example, ESA's Integral gamma-ray observatory was launched on 17 October 2002, long before Astrosat (September 2015).
- ✗ 2. ISRO gives Astrosat's lift-off mass as about 1,513 kg and its orbit as 650 km, inclined at 6 degrees to the equator, launched by PSLV-C30.
Remember · Astrosat: India's multi-wavelength space observatory (UV to X-ray), launched by PSLV-C30 on 28 September 2015; about 1,513 kg, 650 km orbit at 6 degrees inclination.
Sources
- ASTROSAT (Indian Space Research Organisation; page as archived in 2016) ↗ “ASTROSAT with a lift-off mass of about 1513 kg was launched into a 650 km orbit inclined at an angle of 6 deg to the equator by PSLV-C30.”
- Integral overview (European Space Agency) ↗ “Integral was launched by a Proton rocket, Russia's largest operational launch vehicle, on 17 October 2002 from the Baikonur Cosmodrome in Kazakhstan.”
Question and answer: UPSC's official GS Paper I (2016, Series A) — paper ↗ · answer key ↗. Explanation: Minimalist IAS, checked 30 Sept 2026 (how we verify). ·