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Measurements in Astronomy

Measurements in Astronomy. For really, really big and faraway things!!!. U.S. Customary (English Units) Units of Distance. Inch – good for measuring little things, like a pencil (thumb) Foot – 12 inches – good for measuring things like a room or a car (human foot)

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Measurements in Astronomy

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  1. Measurements in Astronomy For really, really big and faraway things!!!

  2. U.S. Customary (English Units)Units of Distance • Inch – good for measuring little things, like a pencil (thumb) • Foot – 12 inches – good for measuring things like a room or a car (human foot) • Yard – 3 feet – good for measuring things like a swimming pool or a football field (nose to finger) • Mile – 1760 yards or 5280 feet – good for measuring distances between cities (1000 paces of Roman Legion)

  3. We’re used to thinking in these measurements, but it’s much harder to do calculations between them. Who wants to divide by 12 or multiply by 1760? Not you, I bet! That’s why metric is awesome!!!

  4. The Metric System • Also called the International System of Measurement – Why? Because every other country in the world uses it! • If you know the prefixes of metric words, you’ll know how to convert between different units.

  5. Prefixes to know • Centi = 100 (cents in a dollar, years in a century) • Milli = 1000 (years in a millenium) • Kilo = 1000 (but kilo is really big, and milli is really small) • So… • 1000 millimeters in a meter • 100 centimeters in a meter • 1000 meters in a kilometer

  6. Metric System Chart

  7. FYI • Prefixes in metric are not just used for distance (meters). They are also used for mass (grams) and volume (liters) too! Isn’t that easy?!?

  8. Scientific Notation • Helps scientists make really, really big and really, really small numbers easier to write. • Who wants to write 1,700,000,000,000,000,000,000,000 when you can write 1.7 x 1024, or 0.0000000000000000000000000002 when you can write 2 x 10-28?

  9. Skill Builder: Scientific Notation • Follow the four steps in the skill builder to fill in the chart on page 1, then answer the questions under part 2.

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