# How was the disc made? · Nebra Sky Disc > Three answers have been proposed. It was cast as a flat preform and hot-forged in about ten cycles of heating and hammering, then annealed. leads, with… Source: https://mysteriesdept.com/mysteries/nebra-sky-disc/questions/QST0D2SB8KT2F7H/how-was-the-disc-made Publisher: Mysteries Department Licence: CC BY 4.0 (credit Mysteries Department and link the page) Updated: 2026-10-26T11:58:13+00:00 --- **0** # How was the disc made? Asked 26 Oct 2026 by [**apollo** ](https://mysteriesdept.com/u/apollo)·Part of [When was the disc made and buried?](https://mysteriesdept.com/mysteries/nebra-sky-disc/questions/QST0D2SB8463DKB/when-was-the-disc-made-and-buried)·3 answers·0·0 following **Answered: It was cast as a flat preform and hot-forged in about ten cycles of heating and hammering, then annealed.** Passed its tests and review. ## Where it stands Three answers have been proposed. It was cast as a flat preform and hot-forged in about ten cycles of heating and hammering, then annealed. leads, with evidence 1 for: supported by its tests. Two are still possible. ## Why it matters Gebhard and Krause raised whether the disc was forged or cast⁠[[1]](https://mysteriesdept.com/sources/SRC0D2SB0J06GQQ/critical-comments-on-the-find-complex-of-the-so-called-nebra); the technology bears on whether it fits Early Bronze Age practice⁠[[2]](https://mysteriesdept.com/sources/SRC0D2SB02C59G6/archaeometallurgical-investigation-of-the-nebra-sky-disc). ## Answers 3 [**It was cast as a flat preform and hot-forged in about ten cycles of heating and hammering, then annealed.** ](https://mysteriesdept.com/mysteries/nebra-sky-disc/answers/ANS0D2SBEFA6ZFK/it-was-cast-as-a-flat-preform-and-hot-forged-in-about-ten) Supported by its tests Evidence: 1 for Most likely [**None of these.** ](https://mysteriesdept.com/mysteries/nebra-sky-disc/answers/ANS0D2SBFEJ4ZKB/none-of-these) Failed a test; not refuted outright Evidence: none yet Disputed [**The disc was cast close to its final shape.** ](https://mysteriesdept.com/mysteries/nebra-sky-disc/answers/ANS0D2SBEYY668R/the-disc-was-cast-close-to-its-final-shape) Failed a test; not refuted outright Evidence: 1 against Disputed ## History 1. 2020[Gebhard & Krause puts forward: the disc was cast close to its final shape.](https://mysteriesdept.com/sources/SRC0D2SB0J06GQQ/critical-comments-on-the-find-complex-of-the-so-called-nebra) 1. 2024[Dieck et al. puts forward: it was cast as a flat preform and hot-forged in about ten cycles of heating and hammering, then annealed.](https://mysteriesdept.com/sources/SRC0D2SB02C59G6/archaeometallurgical-investigation-of-the-nebra-sky-disc) 1. 2024[Dieck et al.: medium grains with annealing twins, elongated sulphide inclusions and random grain orientation; a replica of…](https://mysteriesdept.com/sources/SRC0D2SB02C59G6/archaeometallurgical-investigation-of-the-nebra-sky-disc)For: It was cast as a flat preform and hot-forged in about ten cycles of heating and hammering, then annealed. 1. 2024[Dieck et al.: the low-tin alloy flows poorly; a cast disc of this thinness is ruled out by the microstructure.](https://mysteriesdept.com/sources/SRC0D2SB02C59G6/archaeometallurgical-investigation-of-the-nebra-sky-disc)Against: The disc was cast close to its final shape. 1. 26 Oct 2026Asked on this site ## Discussion 0 [Add to the discussion](https://mysteriesdept.com/signin?next=/mysteries/nebra-sky-disc/questions/QST0D2SB8KT2F7H/how-was-the-disc-made%23discussion) Help with this question [ **Propose an answer** Something the evidence could support or rule out ] [ **Propose an answer** Something the evidence could support or rule out ](https://mysteriesdept.com/signin?next=/mysteries/nebra-sky-disc/questions/QST0D2SB8KT2F7H/how-was-the-disc-made%23add-answer) [ **Add evidence** A result for or against an answer ] [ **Add evidence** A result for or against an answer ](https://mysteriesdept.com/signin?next=/mysteries/nebra-sky-disc/questions/QST0D2SB8KT2F7H/how-was-the-disc-made%23add-evidence) [ **Ask a sub-question** A smaller question that would help settle this one ] [ **Ask a sub-question** A smaller question that would help settle this one ](https://mysteriesdept.com/signin?next=/mysteries/nebra-sky-disc/questions/QST0D2SB8KT2F7H/how-was-the-disc-made%23add-question) [ **Add a source** A paper, archive record or image ] [ **Add a source** A paper, archive record or image ](https://mysteriesdept.com/signin?next=/mysteries/nebra-sky-disc/questions/QST0D2SB8KT2F7H/how-was-the-disc-made%23add-source) Where it fits Nebra Sky Disc [**When was the disc made and buried?** ](https://mysteriesdept.com/mysteries/nebra-sky-disc/questions/QST0D2SB8463DKB/when-was-the-disc-made-and-buried)Key question · most likely the disc was made in the Early Bronze Age, perhaps 1800 to 1700 BC, used and altered for generations, and… **How was the disc made?** You're here · It was cast as a flat preform and hot-forged in about ten cycles of heating and hammering, then annealed. [Where did the copper, tin and gold come from?](https://mysteriesdept.com/mysteries/nebra-sky-disc/questions/QST0D2SB8VM1B5G/where-did-the-copper-tin-and-gold-come-from)Answered · Copper from the Mitterberg in the Salzburg Alps; tin and gold from Cornwall, the gold from the Carnon River. [ Ask a question under this one ]