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Astronomical+Address - Explain communication problem across...

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Astronomical Address (like your return address, but more steps): (7 steps total) 1. Student's usual return address (street, city, state, country). 2. Earth (at light speed, about 186,000 miles per second, you could travel 7 times around the entire earth in just 1 second!) 3. The Solar System (about 10 light hours across -- somewhat bigger then Pluto's orbit diameter). 4. The Milky Way Galaxy (about 100,000 light years across) -- explain a light year.
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Unformatted text preview: Explain communication problem across vast distances (e.g., delay in talking with Mars Rovers, etc.). 5. The Local Group of Galaxies -- about 30 galaxies in a loose grouping -- MW and M31 largest -- diameter about 5 million light years. 6. The Local Supercluster -- thousands of galaxies (about 300 million light years across). 7. Universe -- about 30 billion light years across....
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