This preview shows pages 1–3. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: But picture the difference between someone earning $10,000, $100,000, and $1,000,000 a year. The difference is huge. But we can write this as the difference between someone earning $10 4 , $10 5 , and $10 6 . This is a difference of only 2 powers of 10, but clearly a large difference in terms of wealth. The usefulness of understanding powers of 10 notation cannot be overstated. Picturing big numbers. The number of grains of sand in a onegallon plastic jar is about a billion  1 x 10 9 . How big is a billion? The number of seconds in a year is 3 x 10 7 , and multiplied by 33, you get about 1 x 10 9 . That is, if you are 30 years old you have lived about a billion seconds. If we think about how long a billion years is, then the ration of a year to a billion years is the same as the ratio of a second to about 30 years. The Universe is 13.7 billion years old. So, the ratio of a year to the age of the Universe is the same as the ratio of a second to 300 years....
View
Full
Document
 Spring '06
 NORM
 Astronomy

Click to edit the document details