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Download Dr. Huerta SCALES MLS 603 • 1 mile = 1.6 kilometers • speed of
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Transcript
Dr. Huerta SCALES MLS 603 • 1 mile = 1.6 kilometers • speed of light c = 3 × 105 km/sec • 1 light-year (ly) = 3 × 105 km/sec × 365 days × 24hours × 3, 600 sec = 9.461 × 1012 km • parsec = 3.26 ly • Radius of the Earth = 4,000 miles = 6,400 kilometers • Radius of the Moon = 1,738 km = 1.738×103 km = 0.27 times the radius of the Earth. • Earth - Moon distance = 384,400 km = 3.84 × 105 km = 1.28 light-second • Radius of the Sun = 696,000 km = 6.96 × 105 km = 109 times the radius of the Earth. • Earth - Sun distance = 150,000,000 km = 1.5 × 108 km = 1 A. U. = 8.3 light-minutes • Distance to the nearest star, Proxima Centauri = 4.2 ly • Diameter of our galaxy = 105 ly • Number of stars in our galaxy = 1011 • Distance to Andromeda galaxy (M31) = 2.3×106 ly • Time since Big Bang (Age of the“universe”) ≈ 13.75 × 109 yr • Radius of “observable universe” (distance to Cosmic Microwave Background CMB) ≈ 46 × 109 ly ?
