Quote:
Originally Posted by Rekisha
If all the planets align wouldn't the gravitational field of the larger planets 'pull' in the the smaller planets...
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Right so far. In fact Jupiter alone changes the orbits of the other planets a little bit with its pull. The Earth aligns with Jupiter every 13 years or so. It aligns with all of Mars, Jupiter, and Saturn every (roughly) century and a half. This pull is the majority of why the the planets' perihelia move.
Quote:
Originally Posted by Rekisha
...close to them into their gravitational field resulting in the planets colliding with one another?
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No, this part is wrong. These alignments happen very frequently, and no such collision has occurred, or even come close to occurring in billions of years.