課程信息
66 個審閱
創建者 gaocen
•Jun 25, 2018
super cool and knowledgeable. review again.
創建者 Joy Smith
•May 15, 2018
Thorough, lengthy, weeks-long grounding in the subject. Only problem is stupid peer review.
創建者 Raul Рауль
•Apr 06, 2018
Something worthy.
創建者 luis juri
•Mar 09, 2018
E
創建者 Serge Danan
•Mar 07, 2018
Very clear, very interesting
創建者 derek j scarpelli
•Feb 27, 2018
https://www.nasa.gov/image-feature/jpl/pia22240/splitting-slope-streaks
Sorry Professor David>>>your presentation on the 'dark streaks' on Mars' crater sides is outdated. I personally have studied these some 10 years ago having followed the 3 rovers and the lander 10 years ago and watched the water sublimate from the Phoenix digs, at that point I knew 'instinctively' that the dark lines were sand. Please see NASA link above.
I can not continue your course for the obvious reason that some other data will be outdated.
However, I truly have enjoyed your presentation method and if and when your updates to other lectures are complete I will endeavor to complete the lecture course.
Thank you.
yt
derek scarpelli
Canada
創建者 叶斌龙
•Feb 14, 2018
非常好的课程
創建者 Aidan T.
•Jan 07, 2018
i love it and iam 10 years old
創建者 Richard Kouzes
•Jan 03, 2018
very interesting course
創建者 Justin Crevier
•Sep 27, 2017
A fascinating, excellent, and well-taught course.
