What is the shape and size of the Earth? This lecture traces historical
ideas about the shape of the Earth, from ancient ideas of a Flat-Earth
to Aristotle's compelling demonstrations in the 3rd century BC that the
Earth was a sphere. We then discuss two famous classical measurements
of the circumference of the Earth by Eratosthenes of Cyrene in the 3rd
ce ... Show More
Jul 2019
Cosmic Queries – Summer School
<p>The sun is out, the weather is warm, and summer school is in session! Neil deGrasse Tyson, co-host Matt Kirshen, and astrophysicist Charles Liu answer fan-submitted questions on mathematics, the Big Bang, the laws of physics, neutrinos, relativity, Pluto, the smell of the Milk ... Show More
50m 4s
Mar 2025
Exoplanet Discovery, Dark Energy Evolution
SpaceTime Series 28 Episode 37
The Astronomy, Space and Science News Podcast
Exciting New Exoplanet Discovery, Evolving Dark Energy, and Insights into the Moon's Magnetic Field
In this episode of SpaceTime, we uncover the discovery of a potential new exoplanet, TOI 2818C, located ... Show More
27m 27s
Aug 2022
On Edwin Hubble’s "The Realm of the Nebulae"
Until the publication of Edwin Hubble’s 1936 book, The Realm of the Nebulae, astronomers believed that the Milky Way was the only galaxy in the universe. Hubble infinitely expanded our understanding of the cosmos and showed that what scientists thought was everything, was really ... Show More
38m 32s
Jan 2025
Charting the Architecture of the Universe & Human Life | Dr. Brian Keating
In this episode, my guest is Dr. Brian Keating, Ph.D., a cosmologist and professor of physics at the University of California, San Diego. We discuss the origins of the universe and how humans have used light and optics to understand where and how life on Earth emerged.
We explor ... Show More
3h 7m