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The size of Earth? Or bigger? I'd think they'd have to be pretty big to attract all that gas when the planets were being formed.

edit I'm writing a short story and the setting consists of late eighties/early nineties type of technology and knowledge of astronomy, so a rough estimate as an answer is fine

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    $\begingroup$ This looks like something you can easily look up. $\endgroup$ – user1569 Feb 6 '18 at 8:53
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    $\begingroup$ Wikipedia tells you as much as we know, which is very little. $\endgroup$ – StephenG Feb 6 '18 at 11:20
  • $\begingroup$ @StephenG This abstract seems to hold the information I needed. $\endgroup$ – harada Feb 6 '18 at 13:54
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    $\begingroup$ Search for "formation of Jupiter pdf" and you'll get a feel for how many theories and variations on them there are for the formation of gas giants. Lots. :-) $\endgroup$ – StephenG Feb 6 '18 at 14:01
  • $\begingroup$ Wikipedia suggests the question of what materials and in which phase state comprise the core of Jupiter is less than settled. $\endgroup$ – Carl Witthoft Feb 6 '18 at 16:42
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10-30 Earth masses is an estimate from this abstract, but 12-45 is a more accurate answer.

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  • $\begingroup$ That gives an answer, supported by a source. The nature of the question is that it doesn't need much explanation. $\endgroup$ – James K Feb 9 '18 at 21:21

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