Triple Crescents

Astro News & Info 2015.06.23 21:36 |

Triple Crescents.

3개의 초승달.

3개의 초승달: 토성의 위성인 타이탄 (직경 5,159 km), 미마스 (직경 396 km), 그리고 레아 (직경 1,527 km).

카시니 (Cassini)가 촬영한 토성의 위성들 (타이탄, 미마스, 레아)의 모습들. 3개의 위성이 모두 초승달 모양을 하고 있다.

사진에서 가장 큰 초승달 모양은 타이탄이고, 왼쪽 위에 있는 초승달 모양은 레아이다. 그리고 중앙의 아래쪽에 있는 아주 작은 초승달 모양은 미마스이다.

A single crescent moon is a familiar sight in Earth's sky, but with Saturn's many moons, you can see three or even more.

The three moons shown here -- Titan (5,150 kms across), Mimas (396 kms across), and Rhea (1,527 kms across) -- show marked contrasts. Titan, the largest moon in this image, appears fuzzy because we only see its cloud layers. And because Titan's atmosphere refracts light around the moon, its crescent "wraps" just a little further around the moon than it would on an airless body. Rhea (upper left) appears rough because its icy surface is heavily cratered. And a close inspection of Mimas (center bottom), though difficult to see at this scale, shows surface irregularities due to its own violent history.

The image was taken in visible light with the Cassini spacecraft narrow-angle camera on March 25, 2015.

Image Addition Date: 2015-06-22.

Image Credit: NASA/JPL-Caltech/Space Science Institute.

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