This Will Help You Grasp the Sizes of Things in the Universe
Caleb Scharf wants to take you on an epic tour. His latest book, The Zoomable Universe, starts from the ends of the observable universe, exploring its biggest structures, like groups of galaxies, and goes all the way down to the Planck length—less than a billionth of a billionth of a billionth of a meter. […]
Is Our Universe Like Oil & Vinegar or Homogenized Milk?
Is our Universe inhomogeneous, lumpy and uneven on many size scales, like oil droplets in water?via Shutterstock In the earliest moments after the Big Bang, the Universe was a turbulent mess, a high-temperature stew of quantum fluctuations. As with turbulence in water, the fluctuations acted at every level: If you could imagine observing the […]
What It Means to Live in a Holographic Universe
When you look in the mirror, the image you see looks a lot like you—not exactly the same, because when you raise your right hand, your mirror-self raises its left. What’s more, the mirror image is merely an assemblage of reflected light, without a physical body behind it. Despite these differences, you can see an […]
The Madness of the Planets
Astronomy:Our home in the universe continues to rock out of control.
Universal Remoteness: What the Multiverse Means About Us
Our Universe is vast and mostly empty. Even if many of the billions of planets we suspect are out there have life, most of the cosmos is uninhabitable, and those worlds are unreachable by any means we know. That’s just within our galaxy, which is one of about 100 billion in the part of the […]