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Its mentioned here https://www.theguardian.com/science/2019/feb/22/japans-hayabusa-2-successfully-touches-down-on-ryugu-asteroid that Ryugu is a part of the Solar System material that did not get swept into forming a planet. But how can we be sure that it was not created later for example by an asteroid striking Mars or some other planet? Why do we think its "primordial"?

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    $\begingroup$ This is a great question! It's certainly on-topic here (primordialness is part of the reason for the space exploration mission) but the topic of solar system evolution is probably better for Astronomy SE, I think there are more people able to address that there. If you don't receive any answers here after a while, you could consider moving it. Welcome to Space! $\endgroup$ – uhoh Feb 23 '19 at 0:59
  • $\begingroup$ Thanks. Posted there too: astronomy.stackexchange.com/questions/29825/… $\endgroup$ – safe_malloc Mar 2 '19 at 13:51
  • $\begingroup$ Oh, in Stack Exchange cross-posting the exact same question on two sites is strongly discouraged. I meant that you could ask there instead of here, or wait a while and if no answer, then delete here and post there instead. Why don't you take a little time and decide which site you want to keep your original question, and then modify the question on the other site so that it isn't the same question simply cross-posted. $\endgroup$ – uhoh Mar 2 '19 at 13:55

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