Alex McColgan

speaker

27,837 appearances 101 recordings 1 series first heard Nov 2024 last heard 5d ago

Alex McColgan’s voice in public audio — every appearance, attributed to the second.

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recordings per month · last 12 months

Recordings per month over the last 12 months — 65 in all, peaking in Aug 2026 with 11.

Appearances

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Astrum Space · We Thought It Was Impossible, But We’ve Finally Seen It · 31 Aug 2026 podcast

This new type of stuff interacts with its ordinary baryonic counterpart through gravity. voice-verified

But it doesn't interact with the electromagnetic spectrum, meaning that it doesn't absorb, reflect, or emit any light. voice-verified

This makes dark matter extremely difficult to find and seemingly impossible to observe. voice-verified

At least directly. voice-verified

Yet it influences the cosmos on a galactic scale. voice-verified

It may even be helping to conceal our missing baryonic matter. voice-verified

Since the nineteen eighties, early observations of galaxy distribution have revealed a cosmic pattern. voice-verified

A web. voice-verified

Like a backbone across the universe. voice-verified

This skeleton-like structure has become known as the cosmic web. voice-verified

It's thought to have formed as a result of slight density fluctuations in the early universe, which can be seen in the cosmic microwave background or CMB, a fingerprint of our universe's ancient microwave radiation from about 380,000 years after the Big Bang. voice-verified

These tiny fluctuations in density laid out a blueprint for where matter would collect over space and time. voice-verified

Where there were higher densities, more mass would be drawn in until this great structure was formed. voice-verified

We already know that CMB simulations using supercomputers estimate that dark matter accounts for five times more of the universe than ordinary matter. voice-verified

So it's perhaps no surprise that the cosmic web is thought to contain primarily dark matter. voice-verified

Permeating every corner of our universe, it's made of filaments stretching tens to hundreds of millions of light years across the universe. voice-verified

Where filaments intersect, the concentration of mass is so great that high density nodes are able to form, containing hundreds or even thousands of galaxies. voice-verified

The cosmic web is real. voice-verified

We've mapped large swaths of it. voice-verified

Our galaxy is part of what's known as the local group. voice-verified

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