What is a Planet? |
| Published: April 28, 2009, 7:05 pm |
| Tags: cosmology, general, history, q amp 38 a, resources |
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Just some conventions but we already define what is a continent and what is a island (difined by size), we know what is a moon, etc. but, what is a planet? How do we distinguish between a planet and a simple “rock” in the space? Do we have a 10th planet or not? What do YOU think? Here’s a interesting link about the “10th planet“: http://news.bbc.co.uk/2/hi/science/nature/3511678.stm Pluto was discovered in 1930, so 74 years ago. About the status of planet, the problem of classification is that some physical reason must be used, and not just arbitraty criteria such as “size” or “orbiting a star”. In other words, a physical-based classification for ‘planets’ would say something about the formation processes, initial physical conditions, etc.. all kind of information which is really important for solar system studies. Categories is just a thing defined by men to group other things that have something in common so people [ Full article ] |
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