Cosmology is the study of the entire Universe as a physical system. The
past century has witnessed a revolution in cosmological thought that has
revealed the vastness of space and the depths of cosmic time, a revolution
that is still playing out in the present day. The lecture will review the
Earth's place in the Universe, the age of the Universe as rec ... 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
Mar 2022
Comment calculer l'âge d'une étoile ?
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.
L'importance de la masse
En évaluant, grâce à la radioactivité, l'âge d ... Show More
1m 58s