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Earth in Our Universe

Earth in Our Universe. Big Bang Theory: the universe originated billions of years ago in an explosion from a single point of nearly infinite energy density. ( red shift & cosmic background radiation evidence) https://www.youtube.com/watch?v=koyojPcpbG0 (2 min. video).

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Earth in Our Universe

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  1. Earth in Our Universe

  2. Big Bang Theory: the universe originated billions of years ago in an explosion from a single point of nearly infinite energy density. (red shift & cosmic background radiation evidence) https://www.youtube.com/watch?v=koyojPcpbG0 (2 min. video)

  3. Galaxies are a large-scale group of stars 100,000 light years across (100 – 400 billion stars per galaxy). • Believed to be between 50 billion to 1 trillion galaxies in the universe. • 3 main types: Spiral, Elliptical, & Irregular. https://www.youtube.com/watch?v=pOjZInwd5Ks (1 min. video) Light-year: distance light travels in one year at a rate of 186,000 miles per second. (669,600,000 mph)

  4. Nebular Theory: force of gravity caused gases and dust to contract with a densely packed core to form our solar system about 5 billion years ago. https://www.youtube.com/watch?v=PL3YNQK960Y(3 minute video)

  5. https://www.youtube.com/watch?v=YU6X3SPZAJo (2 minute video)

  6. White dwarf stars are very dense: its mass is comparable to that of the Sun, while its volume is comparable to that of Earth. • Black dwarf stars are a white dwarf that has cooled down to the temperature of the cosmic microwave background, and so is invisible. • Neutron stars are city-size stellar objects with a mass about 1.4 times that of the sun.

  7. https://www.youtube.com/watch?v=mn3Egf59F8c(3 minute video)

  8. Sun-Earth-Moon System: https://www.youtube.com/watch?v=ssA7Ew_BQHY(4 min. video)

  9. https://www.youtube.com/watch?v=JQmgttClZCc (3 minute video)

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