Do the planets ever line up?
Due to planet's eclipical orbit, probability of exact planetary alignment is 1 in 86 billion-trillion-trillion-trillion years!
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About Planetary Alignment
Many have foretold a planetary alignment for the date 12/21/2012, which will signal the end of the world. But a true alignment of all the planets and moons means they would form a straight line leading directly to the sun, an event that scientists say would happen only happen once in 86,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000 years. The earth is only 4 billion years old now, so this wont happen any time soon.
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About Planet
A planet is a celestial body, apparently bigger than poor little Pluto, orbiting a star. They typically have semi-solid metalic core, and the rest of the planet can be either gaseous like Jupiter and Saturn, or more dense and solid like Earth and Mars.
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