चंद्रमा और मंगल पर आश्रय खोजने का रास्ता तैयार कर रहे हैं नासा वैज्ञानिक: Researchers create seismic signals by pounding a steel plate with a 10-pound sledgehammer. The seismic signals scattered back to a string of detectors to reveal voids below ground, including lava tubes and caves comparable to those on the Moon and Mars that may offer shelter for planetary explorers. ~जेम्स रिओर्डन- दस पाउंड (4.5 किलोग्राम)
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