I recently read an article about whether the universe was homogeneous and/or isotropic. (the story is at the top - sorry I couldn't get the link to the permanent article to work here) “gargantuan ripples in the density of matter across the universe, known as baryon acoustic oscillations” is what the article says causes inhomogeneities in the universe, and that we can test for them. First of all, do you think the universe is homogeneous and/or isotropic? Why or why not? and Second, how would we be able to realistically test these properties? Would we have to send a spaceship to the far reaches of the universe and measure the force of gravity between some set of standardized masses? Thoughts on this?