Chapter
The Threat of Asteroids to Earth
17:53 - 29:28 (11:34)
The danger of asteroids lies in their trajectory and outgassing, which can cause changes in their paths, and early detection and action are key in preventing a potential catastrophic collision with Earth.
Clips
Tycho Brahe's precise astronomical data aided Kepler in discovering that the orbits of planets are actually ellipses rather than circles.
17:53 - 22:00 (04:07)
Summary
Tycho Brahe's precise astronomical data aided Kepler in discovering that the orbits of planets are actually ellipses rather than circles. The Inquisition's punishment of Galileo gave him time to publish his findings on the eccentricity of the Sun's position, which supports Kepler's discovery.
ChapterThe Threat of Asteroids to Earth
Episode#137 – Alex Filippenko: Supernovae, Dark Energy, Aliens & the Expanding Universe
PodcastLex Fridman Podcast
Neil deGrasse Tyson discusses a few of the existential threats to life on Earth, including energy depletion and the extinction of complex beings due to asteroid collisions.
22:00 - 25:20 (03:19)
Summary
Neil deGrasse Tyson discusses a few of the existential threats to life on Earth, including energy depletion and the extinction of complex beings due to asteroid collisions. He also mentions the upcoming event of the sun brightening enough to potentially evaporate the Earth's oceans.
ChapterThe Threat of Asteroids to Earth
Episode#137 – Alex Filippenko: Supernovae, Dark Energy, Aliens & the Expanding Universe
PodcastLex Fridman Podcast
It’s difficult to determine the trajectories of comets accurately, especially since outgassing from the comet of gases can change the trajectory.
25:20 - 29:28 (04:08)
Summary
It’s difficult to determine the trajectories of comets accurately, especially since outgassing from the comet of gases can change the trajectory. Early detection and early action are vital, and it's estimated that there are a trillion or 10 trillion comet-like objects that occasionally get disturbed by a passing star or another cosmic phenomenon.