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Nereid is the outermost known satellite of Neptune. It was discovered in 1949 by G. Kuiper. Its mean radius is 170km and it is a very faint object as its magnitude is 18. With an orbital period of 360 days and a highly eccentric orbit, it remains outside the field of view of Neptune.

Dennis Simmons, from Brisbane, Australia, has shot this picture showing the motion trail over a 140 minute exposure as an integration of 7 subframes.

 
2012-10-07 06:21:38       
15. by bus /car / plane 乘公汽 打的 乘飞机16. catch up with 迎头赶上17. catch cold 感冒18. day after day 一天又一天19. do some cleaning 使 干净20. eat up / use up 吃光 用光21. in the end 最后 最终22. fall ill 生病23. on foot 步行24. make fdniers with sb. 与某人交朋友25. in front of 在。。。。前方26. get back /in /off /on 返回 、得到27. get on with 与某人相处28. give up 放弃29. go on doing sth. 继续干某事30. go shopping 购物31. be good at 在某方面擅长32. hand in / out 交上 承上33. have a good time 旅途愉快34. have breakfast / supper 吃早餐/午餐35. have sports 做运动36. hear from 收到某人来信37. here and there 到处38. hold a meeting 举行会议39. hold on 坚持 抓住40. hurry up 匆忙
 
2011-04-11 23:50:25       
Kewl you slohud come up with that. Excellent!
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