Having completed our tour of the Solar System, we now turn to a
discussion of the requirements for life, and where those requirements
might be satisfied elsewhere in the Solar System. Some - energy,
complex chemistry, and liquid water - seem obvious, but they are not the
only possibilities or considerations. At the end, we will have a short
list of possib ... Show More
Sep 2009
Lecture 2: Astronomical Numbers
An introduction and review of the basic notation and physical units we will be
using throughout this course. In particular, we will be using the
Metric (SI) system for lengths, masses, times, and temperatures, and
special astronomical units for distances (AU and Light Years) and ... Show More
43m 56s
<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
