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Traditionally, the study of planet formation has proved frustrating, as astronomers have never been sure whether their theories apply to other planetary systems. ----. Now, however, the observations of debris discs around stars of different masses and ages are helping to place our solar system in context.
B) Most of the discs, however, could not be seen directly
C) What the recent images show is wonderfully unexpected
D) This is because the solar system is the only known example of a planetary system
E) The dust particles probably result from collisions among asteroids
Çözüm:
A) Some discs look like gigantic versions of the rings of SaturnB) Most of the discs, however, could not be seen directly
C) What the recent images show is wonderfully unexpected
D) This is because the solar system is the only known example of a planetary system
E) The dust particles probably result from collisions among asteroids
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