guest Moderator 管理成员 注册 2002-10-07 消息 402,593 荣誉分数 76 声望点数 228 2012-06-03 #1 Tuesday afternoon brings a rare chance to see Venus pass in front of the sun, visible as a black dot through telescopes at the Canada Science and Technology Museum. The “transit” of Venus (passing in front of the sun) won’t happen again until 2117. 更多...
Tuesday afternoon brings a rare chance to see Venus pass in front of the sun, visible as a black dot through telescopes at the Canada Science and Technology Museum. The “transit” of Venus (passing in front of the sun) won’t happen again until 2117. 更多...
