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So Near, and Yet So Far
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1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 So Near, and Yet So Far We can directly observe the composition of the rings of Saturn - 850 million miles away - but we still can't figure out what lies at the center of our Earth - a mere 4,000 miles away! Traditional theory suggests it is a solid core of nickel-iron, surrounded by a liquid region of iron, nickel, and a mix of sulfur, oxygen and silicon. A more avant-garde postulate claims a literal nuclear reactor core of uranium and plutonium, surrounded by a molten core of iron, sulfur and silicon. Both dynamo models account handily for the Earth's magnetic field - including the cyclic variations. The greatest hole ever drilled, on Russia's Kola Peninsula, is only 7.5 miles deep, or less than 0.2% of the way to the center. In geophysicist Herndon's words, "That's roughly comparable to learning about Alaska by driving from St. Petersburg, FL to Tampa." |
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| About RF Cafe | |
 Copyright: 1996 - 2024 Webmaster: Kirt Blattenberger, BSEE - KB3UON |
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RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived... All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged. My Hobby Website: AirplanesAndRockets.com
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