Multiple choice

Who first propounded the theory of expanding universe?

  1. Newton

  2. Galileo

  3. Hubble

  4. Pluto

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Edwin Hubble discovered the expanding universe theory in 1929 by observing that galaxies are moving away from each other, with more distant galaxies receding faster. Newton's laws describe gravity but not universal expansion. Galileo focused on planetary motion, and Pluto is not a scientist.