［Island Universes 孤立した「島」の宇宙］ Stephen Smith March 12, 2014Picture of the Day Three interacting galaxies: NGC 7173 (middle left), NGC 7174 (middle right), and NGC 7176 (lower right). 3つの相互作用銀河：NGC 7173（中長）、NGC 7174…

［Misbehaving Gas ガスの誤動作］ Mel Acheson March 16, 2014Picture of the Day Galaxy cluster RX J1532.9+3021 (RX J1532 for short). X-ray in purple; optical in yellow. 銀河団RXJ1532.9 + 3021（略してRX J1532）。 紫色はX線波長; 黄色は光学波長…