What happens when a high-mass (more than 4 solar masses) Main Sequence
stars runs out of Hydrogen in its core. At first the internal evolution
looks like that of a low-mass star, but now we get first a Red Supergiant
then a sucession of blue and red supergiant phases as different nuclear
fuels are tapped by the star for its energy. This lecture describes
... Show More
Jan 2006
Lecture 16: The Evolution of Low-Mass Stars
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 Planet ... Show More
40m 10s
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