Paris: Astronomers are preparing for one of the highlights of the skywatchers' year, when the Sun, Mercury and Earth all line up -- a phenomenon that happens just a dozen or so times per century.
from NationMultimedia.com - http://ift.tt/1NnTqPS
via IFTTT
トンデモナイ感じがするけど科学的な話 4選
34 分前
0 件のコメント:
コメントを投稿