Multiple choice

Directions: The following question contains paragraph with sentence or phrase missing indicated parenthetically. From the alternatives, select the sentence or phrase that best provides the missing link. As an unseen planet orbits a distant star, the gravitational pull causes the star to move back and forth in space. ( _____ ). The AAT team measures the Doppler shift of stars to an accuracy of 3 metres per second –bicycling speed. This very high precision allows the team to find planets.

  1. At planetary spectacle can be detected by ‘Doppler shifting’

  2. ‘Doppler shifting’ can detect this pull in the bicycling speed.

  3. This causes a shift in the absolute location of the star itself.

  4. That wobble can be detected by the ‘Doppler shifting’ it causes in the star’s light.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

(4) The clue is in the purpose. “This very high precision allows the team to find planets”. The accuracy is important.

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