|COOKIES: By using this website you agree that we can place Google Analytics Cookies on your device for performance monitoring.|
Is the Earth Rare?
If you have a question about this talk, please contact Richard McMahon.
Sackler Lecture 2012
In their 2000 book, Rare Earth, Peter Ward and Don Brownlee argue that complex life (i.e., animal life) is rare, for a variety of reasons, some of which are based on the idea that habitable planets are themselves rare. Possible reasons for this include: 1) Plate tectonics (possibly necessary to stabilize planetary climates) is rare; 2) large moons (possibly necessary to stabilize planetary obliquities) are rare; 3) magnetic fields (possibly necessary to retain atmospheres) are rare; 4) the Sun is anomalously metal-rich; 5) Jupiter-sized outer planets (possibly necessary to protect the Earth from frequent large impacts) are rare. In my talk, I will review these Rare Earth arguments and show that most, or all, of them are less troubling than Ward and Brownlee supposed. That said, there could be other factors not discussed by these authors that could make habitable planets scarce. But this should not discourage us from building the types of large space telescopes required to actually answer this question.
This talk is part of the The Sackler Lectures series.
This talk is included in these lists:
Note that ex-directory lists are not shown.
Other listsCambridge Carbon Footprint Climate week Seminar Bertone Group
Other talksAssassins inside us: how to wield an immunological synapse 'Constructing identities in multilingual classrooms: the experiences of immigrant-background children in primary schools in France and England' Northern Harvests: Hunting, Fishing and Long-term Economic Cycles in the Medieval North Experimental sensitivity analysis of some flow or system Summit diplomacy or top level of the Council? The European Council's role in energy and climate change before and after Lisbon ‘Though this be madness, yet there is method in't’. Landscapes and Identities: the case of the English Landscape c. 1500 BC – AD 1086