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I've noticed that many stars in GAIA DR2 have highly uncertain distances. Why can't a space agency send multiple Gaia spacecraft into orbit around different places (One in L2 Earth, one in heliosynchronous orbit, and one around Jupiter) so the accuracy of observations can be greatly improved?

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    $\begingroup$ In the funding-doesn't-play-a-role-fairyland, sure they would to that. $\endgroup$ Jan 25 at 9:40
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    $\begingroup$ Satellites are not cheap to build. Satellites are not cheap to launch. Satellites are not cheap to operate. Data from satellites is not cheap to process. Need I say more? $\endgroup$ Jan 25 at 9:57
  • $\begingroup$ The premise that ESA "can't" isn't really true, they probably could if they had enough money and resources for it. It might be better to adjust your question and ask in what ways, and by how much would a second GAIA out at 5 AU improve data, and what the technical challenges would be. You might be surprised! $\endgroup$
    – uhoh
    Jan 25 at 15:18
  • $\begingroup$ This is a different question but it's related: How would 2 JWSTs make stereo pictures? $\endgroup$
    – uhoh
    Jan 25 at 15:21

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