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Imagining Other Earths, Princeton University

271 ratings
66 reviews

About this Course

Are we alone? This course introduces core concepts in astronomy, biology, and planetary science that enable the student to speculate scientifically about this profound question and invent their own solar systems. All the features of this course are available for free. It does not offer a certificate upon completion....
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66 Reviews

By gaocen

Jun 25, 2018

super cool and knowledgeable. review again.

By Joy Smith

May 15, 2018

Thorough, lengthy, weeks-long grounding in the subject. Only problem is stupid peer review.

By Raul Рауль

Apr 06, 2018

Something worthy.

By luis juri

Mar 09, 2018


By Serge Danan

Mar 07, 2018

Very clear, very interesting

By derek j scarpelli

Feb 27, 2018

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your presentation on the 'dark streaks' on Mars' crater sides is outdated.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I can not continue your course for the obvious reason that some other data will be outdated.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.


derek scarpelli


By 叶斌龙

Feb 14, 2018


By Aidan T.

Jan 07, 2018

i love it and iam 10 years old

By Richard Kouzes

Jan 03, 2018

very interesting course

By Justin Crevier

Sep 27, 2017

A fascinating, excellent, and well-taught course.