Question

open - ended response
describe the motion of the galaxy.

1. how did edwin hubble change our understanding of the universe?

Explanation:

Edwin Hubble made two key contributions. First, he distinguished between galaxies and nebulae, showing there are many galaxies beyond the Milky Way. Second, he discovered the redshift - distance relationship (Hubble's law, $v = H_0d$, where $v$ is velocity, $d$ is distance, $H_0$ is Hubble constant), proving the universe is expanding. This overturned the static universe model and supported the Big Bang theory, revolutionizing our view of the universe's structure and evolution.

Answer:

Edwin Hubble changed our understanding of the universe in two major ways: 1. He identified that "nebulae" like the Andromeda Nebula were actually other galaxies (extragalactic nature), showing the universe has countless galaxies beyond the Milky Way. 2. He discovered Hubble's law ($v = H_0d$), demonstrating the universe is expanding (most galaxies move away from us, with velocity proportional to distance). This disproved the static universe model, supported the Big Bang theory, and reshaped ideas about the universe's origin, structure, and evolution.