화성의 모습인 듯 싶습니다.

 

외행성의 겉보기 운동을 대표하는 역행현상이 보이는군요. 일주일 간격으로 정확히 같은 위치에서 찍어서 합성한 사진인 듯 하네요..

 

This composite of images spaced about a week apart - from late July 2005 (bottom right) through February 2006 (top left) - traces the retrograde motion of ruddy-colored Mars through planet Earth's night sky. On November 7th, 2005 the Red Planet was opposite the Sun in Earth's sky (at opposition). That date occurred at the center of this series with Mars near its closest and brightest. But Mars didn't actually reverse the direction of its orbit to trace out the Z-shape. Instead, the apparent backwards or retrograde motion with respect to the background stars is a reflection of the motion of the Earth itself. Retrograde motion can be seen each time Earth overtakes and laps planets orbiting farther from the Sun, the Earth moving more rapidly through its own relatively close-in orbit. The familiar Pleiades star cluster lies at the upper left.

 

[이 게시물은 최고관리자님에 의해 2012-12-20 12:46:57 웹 갤러리에서 이동 됨]