Chapter
The Mystery of Dark Energy and Dark Matter
06:46 - 17:53 (11:07)
This episode explores the two categories of dark energy and theories surrounding it, including the zero point energy and a new energy field, as well as the nature of dark matter and its gravitational attraction on galaxies and clusters of galaxies.
Clips
The universe is accelerating in its expansion, and measurements suggest this is due to dark energy.
06:46 - 09:14 (02:28)
Summary
The universe is accelerating in its expansion, and measurements suggest this is due to dark energy. This is predicted to be a result of energy from the vacuum, which is not actually "state of zero energy."
ChapterThe Mystery of Dark Energy and Dark Matter
Episode#137 – Alex Filippenko: Supernovae, Dark Energy, Aliens & the Expanding Universe
PodcastLex Fridman Podcast
The two broad categories of energy in the universe are the vacuum zero point energy and the new energy field that pervades the universe, which was responsible for the exponential expansion of the universe in its early stages.
09:14 - 12:33 (03:18)
Summary
The two broad categories of energy in the universe are the vacuum zero point energy and the new energy field that pervades the universe, which was responsible for the exponential expansion of the universe in its early stages. Later, this energy decayed into gravitationally attractive matter which dominated the universe for about 9 billion years.
ChapterThe Mystery of Dark Energy and Dark Matter
Episode#137 – Alex Filippenko: Supernovae, Dark Energy, Aliens & the Expanding Universe
PodcastLex Fridman Podcast
The heliocentric system, while improving upon some aspects of Ptolemy's system, did not provide a significantly better match for the observed positions of planets in the 16th century.
12:33 - 17:53 (05:19)
Summary
The heliocentric system, while improving upon some aspects of Ptolemy's system, did not provide a significantly better match for the observed positions of planets in the 16th century. Backward motion of planets among the stars required the addition of epicycles to their orbits around Earth.