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- 우주 이야기 1641 - 마이크로 중력 렌즈를 통해 외계 행성을 포착한 TESS Credit: NASA's Goddard Space Flight Center) (This graphic highlights the search areas of three planet-hunting missions: NASA’s upcoming Nancy Grace Roman Space Telescope, the retired Kepler Space Telescope, and
- Epilogue 2 - Fictional space-time and cave torches Epilogue 2 - Fictional space-time and cave torches . Paleolithic people who lived by hunting and gathering used caves in rocky mountains as safe shelters.
