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UPSC 2020: “The experiment will employ a trio of spacecraft flying in formation in the shape of an equilateral triangle that has sides one million kilometres long, with lasers shining between the craft.” The experiment in question refers to
(a)Voyager-2
(b)New Horizons
(c)LISA Pathfinder
(d)Evolved LISA
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Not attemptedCorrect Answer: (d) Evolved LISA
The description matches ESA’s Evolved Laser Interferometer Space Antenna (eLISA/LISA), a planned constellation of three spacecraft in an equilateral-triangle formation ~1 million km apart using laser interferometry to detect low-frequency gravitational waves. Voyager-2 and New Horizons are single interplanetary probes, and LISA Pathfinder was a much smaller technology-demo mission, not the full three-craft configuration. Hence option (d) ‘Evolved LISA’ is correct. ([drishtiias.com](https://www.drishtiias.com/prelims-analysis/2020-prelims-analysis?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2020 Science & Technology question?▼
The correct answer is option (d): Evolved LISA. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Space Technology & Astronomy question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2020, GS Paper 1, as Question 43. It falls under Science & Technology > Space Technology & Astronomy.
What is the difficulty level of this UPSC question?▼
This question is rated "moderate". It requires sound conceptual understanding of the topic.
How many UPSC Prelims questions have been asked from Space Technology & Astronomy?▼
UPSC has asked 69 questions from Space Technology & Astronomy (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.