Physics 0625 · IGCSE · Stars and the Universe

Stars and the Universe — practice question

A galaxy is receding from the Earth with a velocity of $3000\,\text{km s}^{-1}$. What is the distance between the Earth and this galaxy?

  • A$7.3 \times 10^{-25}\,\text{m}$
  • B$7.3 \times 10^{-22}\,\text{m}$
  • C$1.4 \times 10^{21}\,\text{m}$
  • D$1.4 \times 10^{24}\,\text{m}$

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