What happens to a low-mass star (less than 4 solar masses) when
it runs out of core Hydrogen and must leave the Main Sequence.
This lecture describes the changes inside a low-mass star after
Hydrogen exhaustion through the Red Giant, Horizontal Branch,
Asymtotic Giant, and Planetary Nebula phases. In the end, we will
see the star's envelope and core go the ... Show More
Jan 2006
Lecture 13: Energy Generation and Transport in Stars
How do stars generate energy in their cores, and once made, how is
that energy transported to the surface where it can be radiated away
as Luminosity? This lecture revisits nuclear fusion and the Kelvin-Helmholz
Mechanism, and discusses the 3 ways energy can be transported in sta ... Show More
40m 32s
Jun 2009
Telescopes that Rocked Our World
This year marks the 400th anniversary of Galileo’s use of the first telescope. On this week’s show, we reflect on how telescopes have shifted our perspective on how small we are in size, space, and time. We also discuss how they help astronomers discover new and interesting aspec ... Show More
56 m