youngcelly209
youngcelly209 youngcelly209
  • 25-11-2022
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Question 7 of 15
Complete these sentences by matching the phrases below.
Astronomers are
able to
determine the
speed at which
certain
redshifted stars
move using:
Radiotelescopes
reveal that space
?
the Doppler effect.
cosmic microwave
background radiation.

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