This lecture was to be about the Earth's atmosphere, its composition and
structure, the greenhouse effect, and the primordial atmosphere, but
about 2 seconds into the lecture, unbeknownst to me, the battery
compartment on my digital voice recorder came open in my pocket. At the
end of lecture, I took it out of my pocket to turn it off and the
battery didn' ... Show More
Oct 2009
Lecture 9: Inside the Earth
What is the interior structure of the Earth and how does it drive the
Earth's magnetic and geologic activity? We will review our current
knowledge of the interior of the Earth, how we measure it using
Seismology, the origins of the Earth's magnetic field, and discuss the
workings ... Show More
42m 47s
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