Scale of Earth’s Systems

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Light Years Grade 8 Unit 10.

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Presentation transcript:

Scale of Earth’s Systems https://www.youtube.com/watch?v=Zr7wNQw12l8 Journey tot eh Edge of the Universe

http://htwins.net/scale2/ The Universe- the largest SYSTEM What is the Universe? How large is the universe? How many galaxies are in the universe? Section 28.4 on page 631 http://htwins.net/scale2/

Powers of Ten Cosmic Zoom activity http://www.youtube.com/watch?v=0fKBhvDjuy0 Cosmic Zoom activity http://aspire.cosmic-ray.org/Labs/CosmicZoom/

Scientific Notation Convenient way to write extremely large or extremely small numbers Has 2 parts: base and exponent Base exponent Examples: 103 = 10x10x10 = 1000 10-2 = 1/10x1/10 = 0.01

Units to Measure the Universe Astronomical Unit = AU Unit of Length Average distance between Earth and Sun Ave. 93,000,000 miles Light Year = LY The DISTANCE light travels in one year Distance = speed of light x 1 year

Light years is a DISTANCE Speed of light: 300,000 km/sec. (186,000 miles/sec) Times 86,400 seconds in a day Times 365 days in a year 10 trillion kilometers! 10,000,000,000,000 km 1013 km Or about 6 trillion miles!!!

Lag Time Because the sun is 93,000,000 miles away from earth, It takes time for the sunlight to travel that distance (even at a speed of 186,000 mi/s) It takes 8 minutes for the sunlight to reach earth. So…. The light we see from a star that is 1500 ly away, left that star 1500 years ago!

Orion Nebula Nebula of gas, and stars. In the constellation Orion. 1500 light years away. 1344 ly x 6 trillion miles = ??

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