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Transcript of The Universe
Supporting TEKS – 7.2.A & 7.3.A&C Daily Objective: Understand the vastness of the universe, and understand the characteristics of the sun and its relationship to the universe universe - all of space and everything in it Most of our universe is empty.
- 25% is dark matter
- 70% is dark energy 5% is visible to us There are several theories of how our universe
came into existence.
Of these theories, one
of the most well known
is the big bang theory. According to the big bang theory, our universe began 10-15 billion years ago with a large explosion. After the explosion, our universe began expanding and has continued to expand. As we look at objects in space, we are observing objects that were once much closer to us. The Size of the Universe The diameter of the “observable” universe is estimated to be about 93 billion light-years. Light-year: The distance light travels in 1 year. This is a measure of distance, NOT TIME. To truly understand the magnitude of our universe, we first need some perspective. You are Here Now Here The sun is the closest star to the Earth and it rotates once every 27 days. The sun's radiant energy is a source of light and heat for all living things on Earth. Our Sun The sun is:
- A medium-sized star
- Average brightness
- Average temperature
The sun is about 5 billion years old and only about halfway through it’s life-cycle. Why does the sun look so large to us if
it’s only medium-sized? The Sun is about 109 times wider than Earth.
The Sun is composed of:
- 92% Hydrogen
- 7% Helium
- 1% other gases The Sun is at the center of our solar system. The sun has an interior and atmosphere and it is a ball of glowing gas. The sun’s energy comes from nuclear fusion. The temperature inside the sun’s core reaches about 15 million degrees Celsius. The sun’s atmosphere has three layers:
Photosphere: inner layer; what you see when you look at an image of the sun.
Chromosphere: middle layer
Corona: outer layer; looks like a halo; Latin for “crown” Even in an area of the universe that is “crowded”, such as our solar system, objects are still very far apart. If you could travel at the speed of light, which is 186,282 miles per second or 299,792,458 meters per second, it would take 8 minutes and 19 seconds to get to the sun from Earth. On a jet, it would take 17 years! Distance in the Universe It would take 25,000 years to travel to the center of our galaxy. What galaxy are we in? Milky Way Galaxy The next nearest galaxy is the Andromeda Galaxy and it would take 2 million years at the speed of light to reach it from Earth! There are some other interesting galaxies too! http://hubblesite.org/gallery/album/ The Universe Prezi References & Picture References
Adapted from Julie Galle's PowerPoints, 7th & 8th grade Science teacher; Brenham Junior High School; Brenham, TX