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The rocky planets Mercury, Venus, Earth, and Mars were born at the same time from the same material - yet have lived radically different lives. What immense forces are at play?
S1E1 • The Planets 2019 • 2019 • Astronomy
Massive stars fuse heavier elements in their cores than lower mass stars. This leads to the creation of heavier elements up to iron. Iron robs critical energy from the core, causing it to collapse. The shock wave, together with a huge swarm of neutrinos, blast through the star’s outer layers, causing it to explode. The resulting supernova creates even more heavy elements, scattering them through space. Also, happily, we’re in no danger from a nearby supernova.
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Black holes are not the violent monsters people think they are, and new discoveries reveal that they might have been essential to creating stars, giving light, and building the universe itself.
S7E4 • How the Universe Works • 2019 • Astronomy
The multiverse hypothesis, suggesting that our universe is but one of perhaps infinitely many, speaks to the very nature of reality. Join physicist Brian Greene, cosmologists Alan Guth and Andrei Linde, and philosopher Nick Bostrom as they discuss and debate this controversial implication of forefront research and explore its potential for redefining the cosmic order. Moderated by Robert Krulwich and featuring an original musical interlude, inspired by parallel worlds, by DJ Spooky.
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Phil starts the planet-by-planet tour of the solar system right here at home, Earth.
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After we reached the moon, NASA refocused energy on mastering routine spaceflight and living in earth orbit. With the retirement of the Shuttle program, we explore the massive contributions Low Earth Orbit operations have brought to our lives and watch the new guys in town spread their wings, ready to take their place in space history
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