by AlexAntropov86 / https://pixabay.com/ja/illustrations/blackhole-%E9%BB%92-%E7%A9%B4-6281865/ 2015년 9월 14일 세계 최초로... by geralt / https://pixabay.com/ja/illustrations/%E5%AE%87%E5%AE%99-%E7%A9%BA-%E5%87%BA%E6%BC%94%E8%80%85-%E3%82%B9%E3%83%9A%E3%83%BC...