{
  "resource": "https://darksciencedocs.com/exploration-guides/time-dilation/",
  "author": "The Last Transmission",
  "reviewed": "2026-11-07",
  "primary_level": "Grades 9-12",
  "scope": "Publisher-authored selected NGSS practice/concept and CCSS mathematics connections; no complete NGSS performance expectation, external approval or college-accreditation claim.",
  "targets": [
    {
      "code": "NGSS SEP 2",
      "name": "Developing and using models",
      "tasks": [
        "1",
        "2",
        "5"
      ],
      "evidence": "Worldline prediction, parameter comparison and a stated model boundary."
    },
    {
      "code": "NGSS SEP 4",
      "name": "Analyzing and interpreting data",
      "tasks": [
        "3"
      ],
      "evidence": "Compares generated send and receipt events and distinguishes two durations."
    },
    {
      "code": "NGSS SEP 5",
      "name": "Using mathematics and computational thinking",
      "tasks": [
        "2",
        "3",
        "4"
      ],
      "evidence": "Calculations retain units and link values to the model."
    },
    {
      "code": "NGSS SEP 6",
      "name": "Constructing explanations",
      "tasks": [
        "5"
      ],
      "evidence": "Uses numerical clues, a principle and a model limitation."
    },
    {
      "code": "NGSS CCC 3",
      "name": "Scale, proportion and quantity",
      "tasks": [
        "2",
        "3",
        "4"
      ],
      "evidence": "Separates distance/time units, clock ratios and effect scales."
    },
    {
      "code": "NGSS CCC 4",
      "name": "Systems and system models",
      "tasks": [
        "1",
        "5"
      ],
      "evidence": "Defines Earth, ship, signals, inputs and omitted physics."
    },
    {
      "code": "CCSS HSN.Q.A.1",
      "name": "Quantities",
      "tasks": [
        "2",
        "3",
        "4"
      ],
      "evidence": "Uses consistent units and time origins in multistep work."
    },
    {
      "code": "CCSS HSA.CED.A.4",
      "name": "Rearranging formulas",
      "tasks": [
        "6"
      ],
      "evidence": "Shows the algebra isolating beta; only applies when Task 6 is completed."
    }
  ],
  "sources": [
    {
      "title": "NGSS: high-school science and engineering practices",
      "url": "https://www.nextgenscience.org/sites/default/files/HS%20Practices%20Combined.pdf"
    },
    {
      "title": "NGSS: Appendix G, crosscutting concepts",
      "url": "https://www.nextgenscience.org/resources/ngss-appendices"
    },
    {
      "title": "Common Core: quantities, HSN.Q.A.1",
      "url": "https://www.thecorestandards.org/Math/Content/HSN/Q/"
    },
    {
      "title": "Common Core: rearranging formulas, HSA.CED.A.4",
      "url": "https://www.thecorestandards.org/Math/Content/HSA/CED/"
    }
  ]
}