Earth in Our Universe.

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Presentation transcript:

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)

Elliptical, & Irregular. 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)

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)

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

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.

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

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

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