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I've had this dream tonight about a planet that is Earth but inside out. The outside of the planet are rocks, stone, a surface like that of the moon. There a few holes that tunnel through the surface and lead to the inside. There in the center is a tiny sun. On the inside surface everything is like on Earth.

What would this world be like? Can such a world exist?

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    $\begingroup$ Questions about this kind of world are so common, WB has a tag for the category! Take your pick: worldbuilding.stackexchange.com/questions/tagged/hollow-earth $\endgroup$
    – SRM
    Commented Jan 24, 2017 at 6:15
  • $\begingroup$ You said "tiny sun." Depending on how big that gets, you might also be dreaming of a Dyson Sphere. Again... a tag: worldbuilding.stackexchange.com/questions/tagged/dyson-spheres $\endgroup$
    – SRM
    Commented Jan 24, 2017 at 6:17
  • $\begingroup$ I'm not good at interpreting dream but that world you are describing isn't stable and an unstable world can't exist, if it does it won't look anything like Earth! $\endgroup$
    – user6760
    Commented Jan 24, 2017 at 6:29
  • $\begingroup$ Voting too broad, because it is too broad to pick one question and mark duplicate. $\endgroup$
    – Mołot
    Commented Jan 24, 2017 at 7:18

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you had a dream about the hollow earth.

there can be caves, but not a complete shell. Gravity and entropy will crumble such a planet into its lowest energy configuration.

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  • $\begingroup$ What if gravity was virtual? $\endgroup$ Commented Jan 24, 2017 at 6:13
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    $\begingroup$ @SovereignSun: What is "virtual gravity"? $\endgroup$
    – AlexP
    Commented Jan 24, 2017 at 10:21
  • $\begingroup$ @AlexP Created by human $\endgroup$ Commented Jan 24, 2017 at 11:10
  • $\begingroup$ Definition of virtual: 1. Existing or resulting in essence or effect though not in actual fact, form, or name: the virtual extinction of the buffalo. 2. Existing in the mind, especially as a product of the imagination. Used in literary criticism of a text. $\endgroup$
    – L.Dutch
    Commented Jan 24, 2017 at 11:54
  • $\begingroup$ created by human is artificial, but still it will crumble down any shell on the long run $\endgroup$
    – L.Dutch
    Commented Jan 24, 2017 at 11:55
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Or you had a dream about a Dyson Sphere

For your inhabitants on the inside it would look like a hollow earth with a sun at the centre.


Can such a world exist?

As of human technology in 2017. No.

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