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Before 2006, Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto were considered as planets. Below is a partial list of these mnemonics: "Men Very Easily Make Jugs Serve Useful Needs, Perhaps" – The structure of this sentence, which is current in the 1950s, suggests that it may have originated before Pluto's discovery.
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Rare Earth was succeeded in 2003 by the follow-on book The Life and Death of Planet Earth: How the New Science of Astrobiology Charts the Ultimate Fate of our World, also by Ward and Brownlee, which talks about the Earth's long-term future and eventual demise under a warming and expanding Sun, showing readers the concept that planets like Earth ...
The first one I learned (in the mid 1950's) was "Man very early made jars serve useful needs, period." (None too good, I agree.) I suspect this predates the discovery of Pluto, when the "period" was added. Also, the original form of the "My very energetic mother" mnemonic featured pickles, not pizzas. (Unimportant, of course.)
For example, Komarr is a cold planet with high CO 2 that is going through long-term terraforming to make it habitable, while Beta Colony is a hot, sandy planet where humans must live underground. Barrayar's vegetation is incompatible with Earth's, and often poisonous or allergenic to humans; Barrayarans clear native forest and use compost from ...
A parade of planets occurs when several planets are visible in the night sky at once, and appear to form a line. "The planets will orbit the sun in roughly the same plane (called the ecliptic ...
The distance separating the two planets in the sky will be less than the width of a pinky finger held out at arm's length. The planetary convergence is one of the top astronomy events of 2023.
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