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How did one graph show the universe is growing?

Algebra 1Lines of fitabout 2 minCCSS HSS.ID.B.6.cCCSS HSS.ID.C.7

Stretch some dough and run the universe backward.

Lesson Plan

Fit a line to real data, then interpret its slope with Hubble's law.

  1. Question: Ask what students spot and what they are curious about. Read “How fast does the far one move away?” aloud. Have each student guess and say why.

  2. Question: Read “Are we at the center?” aloud. Have partners explain their guesses to each other.

  3. Big idea: Pause. Ask a student to say the idea in their own words.

  4. Real-world application: Ask: Where else have you seen this?

  5. Your turn: Have students try their own. Ask them to predict before they test.

How to run it

  1. Whole classPut the lesson on the board. At each choice the class votes, then you select the winner.
  2. SoloShare the link, QR code, or post to Google Classroom. Each student gets to take their own path.