Archive for the ‘Cosmology’ Category

The Big Bang Wasn’t The Beginning, After All


(Starts With A Bang!) – Ethan Siegel:

Why you can’t extrapolate back to a singularity. …

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Big Bang expansion timeline


Dark Matter in Black Holes


(Nautilus Cosmos) – Pedro Ferreira:

The elusive substance may not be a new kind of particle at all. … 142 dark-matter

Black Hole simulation at LMC

The Too-Small God


(Patheos::Excommunications) – Dave Cortesi:

Had I been born in another time and place, there are gods I could have believed in. In ancient Greece, I’m sure I would have been a devotee of the great Athena, and gone often to the beautiful temple on the Acropolis to worship.

Had I been born in India before 1800, I probably would have prayed often to Ganesha, the elephant-headed god of wit and wisdom. Born to a Native American tribe before the coming of the whites, I’d have felt close affiliation with Coyote, the trickster and storyteller.

But as it happened, I had the great good fortune to be born in a Western culture after the Enlightenment, and that placed a lower limit on the size of my God. …

patheos 2017/05 too-small-god

Galaxies in Hubble Extreme Deep Field

If the Universe is expanding, why aren’t we?


(Starts With A Bang!) – Ethan Siegel:

Space is getting bigger, but atoms, humans, Earth and our Milky Way stay the same size. How is this possible? …

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Is there a Center of the Universe?


(Starts With A Bang!) – Ethan Siegel:

Perhaps the Universe has a finite shape and a finite size, but if it does, that information is inaccessible to us. The portion of the Universe observable to us is finite, and that information isn’t contained within it.

What we’re sure of is that it’s expanding, it’s getting less dense, and the farther away we look, the farther back in time we’re able to see. …

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Two Micron All-Sky Survey (2MASS)

Fictional Multiverses Are Lame


(Nautilus Cosmos) – Shannon Stirone:

The multiverse movie that scientists usually rate the highest is Sliding Doors, wherein the simple act of Gwyneth Paltrow’s character missing her train creates a new branch of reality. We see the world play out as if she had or hadn’t missed her train. “That’s a pretty faithful story in terms of there is a crucial event that happened and things go two different ways,” physicist Sean Carroll says. “They don’t really interfere with each other in any way, but you follow the two parallel tracks.” … fictional-multiverses

Sliding Doors, 1998 film

Scientific Myths About the Universe


(Starts With A Bang!) – Ethan Siegel:

How a little knowledge can bring about some huge misconceptions… and how to fix it …

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Universes arise

Is Physical Law an Alien Intelligence?


(Nautilus::Fakes) – Caleb Scharf:

Alien life could be so advanced it becomes indistinguishable from physics. … alien-intelligence

Universes arise

Could the Universe Be Infinite?


(Starts With A Bang!) – Ethan Siegel:

Perhaps the limits of what we can observe aren’t just artificial; perhaps there are no limits to what’s out there at all. …

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Universes arise

Why Hubble Will Never See the First Stars


(Starts With A Bang!) – Ethan Siegel:

Even if it looked for an infinite amount of time, they’d always be invisible. …

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Cosmic Reionization Era