इसरो (ISRO) का SSLV-D4 मिशन सफल: छोटे उपग्रहों के बाजार में भारत की पकड़ मजबूत
भारतीय अंतरिक्ष अनुसंधान संगठन (ISRO) ने अपने लघु उपग्रह प्रक्षेपण यान (SSLV) की चौथी विकासात्मक उड़ान को सफलतापूर्वक पूरा किया।
2-Minute Summary (TL;DR)
- ISRO's SSLV-D4 successfully launched on May 3, 2026, placing EOS-07, AzaadiSAT-2, and Janus-1 into orbit.
- SSLV is designed for satellites up to 500 kg, offering 'launch on demand' capability for Low Earth Orbit (LEO).
- The mission enhances India's competitiveness in the global small satellite launch market.
- AzaadiSAT-2 was developed by 750 girl students from rural India, promoting STEM education.
- SSLV's key advantages include low cost, reduced turnaround time, and minimal infrastructure needs.
- EOS-07 is an Earth Observation Satellite crucial for disaster management, resource monitoring, and climate studies.
- SSLV-D4 builds on previous developmental flights (SSLV-D1, SSLV-D2), demonstrating improved reliability.
- The success strengthens India's self-reliance and commercial potential in the space sector.
How This Topic is Tested in Competitive Exams
| Exam | Frequency | Approx. Marks | What Gets Asked |
|---|---|---|---|
| UPSC / State PCS | Medium | 5–8 | UPSC tests Science & Technology through governance: space policy, biotech regulations, cyber security. |
| SSC (CGL / CHSL / MTS) | High | 4–8 | Basic science, space missions, ISRO launches, and defence technology are standard SSC GK topics. |
| Railway (RRB NTPC / Group D) | Very High | 6–10 | Science and Technology is one of the largest GK sections in Railway papers. |
| State PCS / PSC | Medium | 3–5 | Space missions, defence acquisitions, and health research appear regularly. |
Key Facts to Remember: इसरो (ISRO) का SSLV-D4 मिशन सफल: छोटे उपग्रहों के बाजार में भारत की पकड़ मजबूत
- ISRO's SSLV-D4 successfully launched on May 3, 2026, placing EOS-07, AzaadiSAT-2, and Janus-1 into orbit.
- SSLV is designed for satellites up to 500 kg, offering 'launch on demand' capability for Low Earth Orbit (LEO).
- The mission enhances India's competitiveness in the global small satellite launch market.
- AzaadiSAT-2 was developed by 750 girl students from rural India, promoting STEM education.
- SSLV's key advantages include low cost, reduced turnaround time, and minimal infrastructure needs.
- EOS-07 is an Earth Observation Satellite crucial for disaster management, resource monitoring, and climate studies.
- SSLV-D4 builds on previous developmental flights (SSLV-D1, SSLV-D2), demonstrating improved reliability.
- The success strengthens India's self-reliance and commercial potential in the space sector.
Practice Questions
Q1. What is the primary objective of ISRO's Small Satellite Launch Vehicle (SSLV)?
- To launch heavy communication satellites to Geostationary Orbit.
- To deploy small satellites weighing up to 500 kg into Low Earth Orbit (LEO) on demand.
- To carry astronauts to the International Space Station.
- To launch interplanetary missions to Mars and beyond.
Explanation: The SSLV is specifically designed to cater to the growing market for small satellites, offering a flexible and cost-effective 'launch on demand' service for payloads up to 500 kg destined for LEO.
Q2. Which of the following was a co-passenger satellite launched aboard SSLV-D4?
- RISAT-2B
- Chandrayaan-3 Lander Module
- AzaadiSAT-2
- GSAT-31
Explanation: AzaadiSAT-2, a CubeSat developed by 750 girl students from rural India, was one of the co-passenger satellites successfully deployed by the SSLV-D4 mission.
Q3. What is a key advantage of the SSLV platform compared to ISRO's larger launch vehicles like PSLV?
- Higher payload capacity to Geostationary Orbit.
- Ability to carry heavier payloads to Lunar missions.
- Lower cost, reduced turnaround time, and minimal infrastructure requirements.
- Faster ascent speed during launch.
Explanation: The SSLV is designed for efficiency and cost-effectiveness, featuring a significantly lower launch cost, quicker integration and launch capabilities (reduced turnaround time), and requiring less ground support infrastructure than the PSLV.
Q4. The Earth Observation Satellite (EOS-07) launched by SSLV-D4 is primarily intended for:
- Deep space communication.
- Studying the Sun's corona.
- Monitoring Earth's resources, disaster management, and climate change.
- Testing new propulsion systems in orbit.
Explanation: EOS-07 is an advanced Earth Observation Satellite designed to provide data crucial for applications such as resource management, urban planning, disaster response, and monitoring environmental changes and climate patterns.
Q5. What does the 'Launch on Demand' capability of SSLV signify?
- ISRO can launch satellites only during specific astronomical alignments.
- Missions can be scheduled and launched relatively quickly based on customer requirements.
- The launch vehicle requires extensive pre-launch preparations that take months.
- It allows for manned missions to be launched at any time.
Explanation: 'Launch on Demand' means that the SSLV system is designed for agility, enabling ISRO to respond to customer needs and launch satellites with shorter lead times compared to traditional launch schedules.
How to Prepare Science & Technology for Government Exams — इसरो (ISRO) का SSLV-D4 मिशन सफल: छोटे उपग्रहों के…
For Railway exams, make flashcards for every major ISRO launch — name, payload, purpose, date. These repeat frequently.
For SSC, focus on defence acquisitions and their strategic significance rather than technical specs.
For UPSC, connect every scientific development to policy — climate targets, digital India, health policy.
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