Answer :
Final answer:
The discovery made in 1998 that revolutionized our thinking regarding the expansion of the Universe was the evidence for accelerating expansion of the Universe.
Explanation:
The important discovery made in 1998 that revolutionized our thinking regarding the expansion of the Universe was the evidence for accelerating expansion of the Universe. This discovery was made by two research teams studying distant supernovae: the Supernova Cosmology Project and the High-Z Supernova Search Team. They found that the light from these supernovae was fainter than expected, indicating that the expansion of the Universe was actually speeding up rather than slowing down due to gravity.
Learn more about accelerating expansion of the Universe here:
https://brainly.com/question/33720142
#SPJ11
