What is the nature of matter, and how did we come to understand the
chemical elements and atomic structure? This lecture is a brief and
selective overview of the history of our understanding of the nature of
matter and chemistry. We will also introduce spectroscopy and
radioactivity, two very powerful tools that came out of the chemical
revolution that are ... Show More
Sep 2009
Lecture 6: The Geological Revolution - Deep Time and the Age of the Earth
The geological revolution revealed that the Earth is of great antiquity and yet has a history we can read in the land. We will discuss ideas of cyclic and linear time, historical versus physical age estimates, the discovery of geological time, and radiometric dating methods that ... Show More
46m 11s
<p>La durée de vie d'une étoile peut nous renseigner sur sa composition et sur l'existence éventuelle de la vie dans le cosmos. mais, en dehors du Soleil, il est assez difficile de déterminer l'âge d'une étoile.</p><br><p>L'importance de la masse</p><br><p>En évaluant, grâce à la ... Show More
