We end our exploration of life on the Earth with a look at death in the
fossil record. This lecture looks at the role asteroidal impacts have
played in the history of the Earth, and their possible role in mass
extinction events in the fossil record. We will discuss near-earth
asteroids, historical impacts, and the K-T event in which a massive
asteroid imp ... Show More
Oct 2009
Lecture 19: The Origin of Life on Earth
How did life arise from non-life? Frankly, we don't know, but current
experimental work is aimed at trying to understand how it might work in
biochemical terms. This lecture sets out the problem of "abiogenesis",
and describes our current thinking about the likely origins of life ... Show More
46m 8s
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