Earth Sciences

Ken Amor looks at the science of large meteorite impacts on Earth.

Large Meteorite Impacts on Earth

Large Meteorite Impacts on Earth | CastVibes

The Chelyabinsk Meteor

3rd Annual Lobanov-Rostovsky Lecture in Planetary Geology delivered by Professor Raymond T Pierrehumbert. Atmospheres are dynamic entities, formed from the volatile substances that accrete when a planet is formed and later in its history, cooked out in the hot-high pressure interior of the planet, and exchanging with the interior through crustal processes (for planets which have a solid surface) or mixing into the deep interior (for fluid planets).  Loss of atmosphere to space is also a major mechanism whereby the chemical composition of entire planets evolve.  There is thus no distinct boundary between the disciplines of planetary geology and planetary atmospheres, and the dawning age of exoplanet discovery has made it even more essential to think across the boundaries of the two disciplines.  The likely characteristics of known exoplanets greatly expand the range of substances that have to be thought of as atmospheric components, with many things thought of as “rocks and minerals” on Earth being atmospheric or cloud forming substances.  There are planets hot enough to have permanent magma oceans which may give rise to rock vapor atmospheres, and others where clouds may be formed of enstatite or even sapphire (or more prosaically, corundum).  Some of these atmospheres are supersonic and local; others may be global and subsonic.  There is also a host of new problems to be thought about in connection with “gas midgets,” which are mostly fluid but small enough that they need not have a hydrogen dominated composition.  In this lecture, I will provide a survey of the emerging field of integrated planetary science, and conclude with some thoughts on how to train the next generation of planetary scientists to deal with the leading-edge problems of the future.

The Origins and Evolution of  Exoplanet Atmospheres and Oceans

Prof Alessandro Morbidelli of the Observatoire de la Cote d'Azur in Nice gives the 2nd Lobanov-Rostovsky Lecture in Planetary Geology. He talks about the formation of planets in the universe. Morbidelli uses numerical modelling and geochemical and cosmochemical analyses to explain planetary formation within our solar system. He provides a growth history of the Earth, with reference to the specific elements found in the Earth mantle, as well as insight into the composition and timing of moon formation.

The Formation of Terrestrial Planets - the 2nd Lobanov-Rostovsky Lecture in Planetary Geology

The first Lobanov-Rostovsky Lecture in Planetary Geology delivered by Professor Linda T. Elkins-Tanton.

Building Earth-like Planets: from gas and dust to ocean worlds.

From the 2010 Alumni Weekend. Phillip England talks about the history of Greece through its many earthquakes and seismic activity over the last 6000 years and shows how these events shaped the ancient world's history.