Unformatted text preview: which exist in our own solar system. The Telescope frequently spots “protoplanetary disks” around stars, which are debris of gas and dust where planets may be formed, suggesting that planetary formations around stars is not at all uncommon. There may be even more planets than the telescopes show because the telescopes can only detect planets that are the same size or bigger than that of the Earth; it is likely that many smaller planets have yet to be discovered. Even today, new planets are being discovered every day. Using the data that telescopes have gathered over the years, namely an educated estimation of the amount of stars there are in the galaxy and then how many of those stars have planets, a fraction can be derived. Currently, f p = about 0.4. http://library.thinkquest.org/C003763/index.php?page=origin09 Lecture slides – Feb 28...
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- Winter '10
- Solar System, Planet, Hubble Space Telescope, terrestrial planets