Question

What are 2 popular ideas of what cause fluctuations?

Answer 1

density

Step-by-step explanation:

population density when telling some one that an areea id densly populated you are telling them that this is highly populated but the next year you might come and see that actually it is not densly but sparsly populated

Answer 2

While gravity can enhance the tiny fluctuations seen in the early universe, it can not produce these fluctuations. Cosmologists speculate about the new physics needed to produce the primordial fluctuations that formed galaxies. Two popular ideas are: Inflation.