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The measured rates strongly deviate from uniform expansion, decreasing radially by about 60% along the X-ray bright SE-NW axis from 0.84% +/- 0.06% per yr to 0.52% +/- 0.03% per yr. This corresponds to undecelerated ages of 120-190 yr, confirming the young age of G1.9+0.3, and implying a significant deceleration of the blast wave. The synchrotron-dominated X-ray emission brightens at a rate of 1.9% +/- 0.4% per yr. We identify bright outer and inne"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1406.2287","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2014-06-09T19:12:03Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"4fc190e3d4af7363cc912b64d7a947edf757bbcab7acf6f43c809d9903da7aa7","abstract_canon_sha256":"191af2e979eeb30a66753bd2d72a021bab82253cb0069712c188539a9cc4f3df"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:43:00.961702Z","signature_b64":"HpNYelLdouaBXZod9sQP3Gs0PoN33YtfaayfrxXG+g8h35ysaEp4EadCaxF9G3ICB1eGem8zEwJqP2BIgq7tAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a85aa3c57b70f25f9d3a342ac0fe8a4f7f3f25228eed809f5642fa71c98fb58d","last_reissued_at":"2026-05-18T01:43:00.961201Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:43:00.961201Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Nonuniform Expansion of the Youngest Galactic Supernova Remnant G1.9+0.3","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.HE","authors_text":"D. 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