Question 28
Gordon Walker and Bruce Campbell are the pioneers of exoplanetary science. Using the wobble method of detecting stars (hundreds of light years away) wobbling ‘around invisible planets’, they discovered the first planet outside of the Solar System _______.
Editorial review: check discovery dates, researchers and the reference year of “ago”.
Original choices:
A. 5 years ago
B. 10 years ago
C. 30 years ago
D. 75 years ago
E. 100 years ago
Editorial review: check discovery dates, researchers and the reference year of “ago”.
Original choices:
A. 5 years ago
B. 10 years ago
C. 30 years ago
D. 75 years ago
E. 100 years ago