Ep. 2: What the Universe Is Made of скачать в хорошем качестве

Ep. 2: What the Universe Is Made of

MIT RES.8-007 Cosmic Origin of the Chemical Elements, Fall 2019 Instructor: Anna Frebel View the complete course: https://ocw.mit.edu/RES-8-007F19 YouTube Playlist:    • MIT RES.8-007 Cosmic Origin of the Chemica...   After the Big Bang, the universe was composed of just hydrogen, helium and tiny amounts of lithium. With time, heavier elements were forged in the many generations of stars. After about 8 billion years, the Sun was born, from gas that contained 1.4% of heavier elements. Today, this amount has increased to 2%. The Astronomer's Periodic Table depicts the three most important constituents of the universe: X (= hydrogen), Y (= helium), and Z (= metals). (In the astronomical sense, 'metals' refers to all the elements except hydrogen and helium.) License: Creative Commons BY-NC-SA More information at https://ocw.mit.edu/terms More courses at https://ocw.mit.edu