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Grade 12 Stars, Galaxies & the Big Bang Worksheet with Answers

Grade 12 (US) · Year 13 (UK) · Class 12 (India) · Physics

Unit 4: Modern PhysicsStars & the Big BangNGSS HS-ESS1-2

How stars shine and evolve, galaxies, and evidence for the Big Bang. This free high school worksheet has 12 questions and a full answer key. Print it or save it as a PDF — every answer is checked by code, not guessed.

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Stars, Galaxies & the Big Bang

Grade 12 · Physics

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Name

Class

Date

Learning goal: Stars & the Big Bang · NGSS HS-ESS1-2

Directions: This worksheet has 2 parts. Read the instructions at the start of each part.

RememberOrbits and stars

1. Orbits are ellipses, Sun at one focus.2. Planets move faster near the Sun.3. T² ∝ a³ (farther = longer year)Stars: nebula → star → red giant→ white dwarf (or supernova)
Part A

Match each clue to the right word. Write the letter in the box.

  1. 1What powers a star?
  2. 2What element do stars mainly fuse in their cores?
  3. 3What galaxy do we live in?
  4. 4Where do elements heavier than iron mostly form?
  • AIn supernova explosions
  • BHydrogen
  • CMilky Way
  • DNuclear fusion
Part B

Answer each question. Use full sentences where you can.

  1. 5

    Why do hotter stars look blue?

  2. 6

    What is the cosmic microwave background?

  3. 7

    What evidence shows the universe is expanding?

  4. 8

    What is a light-year?

  5. 9

    What is a galaxy?

  6. 10

    What theory describes the origin of the universe?

  7. 11

    What forms when a very massive star collapses?

  8. 12

    What will our sun become at the end of its life?

★ Challenge corner for fast finishers

You are in a closed room with a candle, a match and a lamp. What do you light first?

How did I do?

Teacher's comments

Free printable worksheets with answer keys · aethelsystems.com/worksheets/physics/12/universe

Answer key (click to show)
  1. 1.D — nuclear fusion
  2. 2.B — hydrogen (into helium)
  3. 3.C — the Milky Way
  4. 4.A — in supernova explosions (and neutron star mergers)
  5. 5.they emit more short-wavelength light
  6. 6.leftover radiation from the early universe
  7. 7.light from distant galaxies is redshifted
  8. 8.the distance light travels in one year
  9. 9.a huge system of stars, gas and dust held together by gravity
  10. 10.the Big Bang theory
  11. 11.a neutron star or a black hole
  12. 12.a red giant, then a white dwarf
  13. ★the match (challenge corner)

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