TST Trainer

3 Random Tidbits

Topic:
Cosmology

The universe including astronomy, physics, and structure.

MODE:
Main Menu

Cosmology.

3 random tidbits in about 5 minutes.

1.

A Cosmology FAQ.

Subject: Big Bang.

Will the universe end in an ever-expanding cold isolated death?.

The universe is likely to expand forever toward a cold, isolated end known as the Big Freeze, but that’s trillions of years from now.

Simply put.

Cosmologists model the universe using three models: the eternally expanding Big Freeze, the runaway expanding Big Rip, or the recycling Big Crunch. The leading framework, Lambda Cold Dark Matter, best fits current data. It points toward endless expansion because gravity is not strong enough to stop it.

Now, the details…

Right now, with the galactic material we can observe, it appears the universe is on a path to a “Big Freeze.” This is a depressing thought, but you have to remember this is speculation. We really just don’t know.

There are currently three categories of models that describe the movement of the universe: Lambda Cold Dark Matter theory, Big Rip, and Big Crunch. These three are centered around the strength of gravity and whether or not it will overpower the expanding universe. Essentially, the Lambda Cold Dark Matter theory, the leading theory, describes a universe where the expansion wins, a universe that expands forever, ultimately ending in a Big Freeze.

Right now, based on our limited observations and knowledge, one of our best guesses is that the universe ends in a Big Freeze. Right now, with what we know, we need more galactic material for this not to be true.

 


That Cosmology FAQ, 

was first published on TST 2 years ago.

The flashcard inspired by it is this.

Front: What is the category of outcome, and the leading model, for an ever-expanding universe?
Back: The Big Freeze and the Lambda Cold Dark Matter (ΛCDM) model.

 

2.

A Cosmology Quote.

Subject: Impermanence.

“Everything is in flux.”.

  • Heraclitus.
  • 500 BCE.
Change is the only form of permanence that exists—first glimpsed by ancient thinkers, and now woven into the fabric of modern science.

At its core.

Heraclitus’ claim that “everything is in flux” captures a deep truth shared by both metaphysics and classical physics. The world appears stable only because change often happens gradually. Beneath every solid object, fixed identity, and steady law lies continuous motion, transformation, and becoming. What endures is not stillness, but patterned change.

Now, the details…

Around 500 BCE, Heraclitus looked at the world and rejected the comforting idea of permanence. He noticed that rivers flow, fires consume, bodies age, and societies transform. His famous insight—often paraphrased as you cannot step into the same river twice—was not poetic exaggeration. It was a metaphysical claim: reality is not made of static things, but of ongoing processes.

Classical physics eventually echoed this intuition. What looks solid is actually motion at every scale—atoms vibrating, planets orbiting, energy transferring. Even a rock sitting still is not truly still. It is held together by forces in balance, not frozen in time. Stability, in physics, is not the absence of change; it is change arranged in a lasting pattern.

Metaphysically, this challenges how we think about identity. If everything is always changing, what does it mean to be something? Heraclitus’ answer is subtle: identity is not sameness over time, but continuity through change. We persist not because we are unchanged, but because change follows a recognizable path. Flux is not chaos—it is the rule that makes persistence possible at all.

 


That Cosmology Quote, 

was first published on TST 4 months ago.

The flashcard inspired by it is this.

Front: In physics, what does apparent “stillness” usually represent?
Back: Dynamic equilibrium.

 

3.

A Cosmology Story.

From History:
Subject: Galileo.

Galileo: Observation Corrects the Map.

1610
In 1610, Galileo set incorrect maps of the cosmos on the right path. Our mental model of Earth at the center of the universe had to evolve to match observations.

The central point is this.

In 1610 Galileo started the process of fixing centuries of incorrect mental models. In Sidereus Nuncius, observation began publicly challenging the old map of the cosmos. The world had not changed. Before then, most inherited the idea that the heavens were perfect, smooth, and fundamentally different from Earth. Then Galileo turned his telescope upward and saw a rough Moon, countless stars, and moons circling Jupiter.

Now, the details…

Galileo did not change the heavens. He changed how humans described them. When his telescope revealed a rough Moon and moons orbiting Jupiter, it exposed a gap between inherited ideas and the material world itself. That gap is the split: reality is one thing, our models of it another. Wisdom begins when we remember the difference.

Translated from early Italian, Galileo wrote the following in his Il Saggiatore (The Assayer) in 1623:

“Philosophy is written in that great book which ever lies before our eyes—I mean the universe.”

 


That Cosmology Story, 

was first published on TST 2 months ago.

The flashcard inspired by it is this.

Front: The view that mind or ideas are more fundamental than the material world.
Back: Idealism.

 

The end. Refresh for another set.

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Writing and coding by Michael Alan Prestwood.
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