Ethan Siegel

Author Archive

  • May 7, 2021
    In the early half of the 20th century, even after the discovery of the expanding Universe, physicists considered a wide variety of origin stories for our Universe. In the mid-1960s,...
  • May 4, 2021
    In theory, the Universe should be the same, on average, everywhere.
  • Mar 29, 2021
    Ask anyone — even someone with no background in science — to name something that Einstein did, and odds are they’ll come back with his most famous equation: E =...
  • Mar 15, 2021
    One of the greatest puzzles in all of physics is that the laws of nature — as we know them, at least — do a remarkably good job of explaining what matter is and how all...
  • Feb 26, 2021
    When we look out at the Universe today, it simultaneously tells us two stories about itself. One of those stories is written on the face of what the Universe looks like today, and...
  • Feb 24, 2021
    If you wanted to uncover the secrets of the Universe for yourself, all you’d have to do is interrogate the Universe until it revealed the answers in a way you could comprehend...
  • Feb 15, 2021
    When most of us think about the Universe, we think about the material objects that are out there across the great cosmic distances. Matter collapses under its own gravity to form...
  • Jan 24, 2021
    As we step forward in time, a number of things always seem to happen together. Objects move through the Universe proportional to their velocity. They change their motion due to the...
  • Jan 7, 2021
    If you take a look at the structures that form in the Universe, many of the things we see on large scales appears at smaller scales, too. The dark matter halos that form around the...