Water Above, Water Below, Water Within: The Many Roles of Water in Making Planets Habitable

Dr. Laura Schaefer (Stanford University)
Nov. 15, 2023
Water is everywhere. Its atoms, hydrogen and oxygen, are the first and fifth most abundant elements in the universe. Water is found in abundance in many environments; it finds its way into planets of all shapes and sizes, where it modifies the properties of everything it touches. Water is crucial to life, both as a habitat and as a solvent. But it also has many other roles in the evolution of habitable and uninhabitable environments on a planetary scale. In this talk, Dr. Schaefer discusses the ways in which Earth acquired its water, how water modifies the evolution and habitability of the Earth, and how the habitability of rocky planets orbiting other stars may be different.
Laura Schaefer is an Assistant Professor of Earth and Planetary Sciences at Stanford University.

[@rtropson]

Very informative, Loved this lecture! However, I question the illustration showing the sphere radius of water for the earth compared to other moons, etc. In particular, the radius of water on the surface of the earth is shown as 225 miles which equates to a volume of 47.7 million cubic miles. However NOAA and other sites show approximately 321 Million cubic miles as an estimate (plus or minus a few percent). Using that data, the radius of water on the surface of the earth would equate to 425 miles - nearly twice the radius. Could you explain the discrepancy?

[@rhoddryice5412]

Ads every six minutes is a wee bit excessive I think.

[@Draliseth]

Yeeeesh. That's.. I'm sorry.