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Cosmology Forum

Join in expert discussion on topics revolving around cosmology. Cosmology is the origin, evolution, structure and eventual fate of the universe.

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Redshift as evidence of expansion

Jan 25, 2012 · Replies 56 · Jan 31, 2012

2

Replies: 56

Views: 12K

How can a 1-dimensional being prove they live on a circle?

Jan 19, 2012 · Replies 35 · Jan 30, 2012

2

Replies: 35

Views: 12K

Is the Universe Expanding Into 4th Dimension?

Jan 25, 2012 · Replies 17 · Jan 30, 2012

Replies: 17

Views: 5K

Will we always be in observation mode?

Jan 28, 2012 · Replies 7 · Jan 30, 2012

Replies: 7

Views: 3K

Girl Reaches 99.9% of Train's Speed Despite Time Slowing Down

Jan 29, 2012 · Replies 5 · Jan 30, 2012

Replies: 5

Views: 3K

Cosmological constant supports MOND

Jan 25, 2012 · Replies 19 · Jan 29, 2012

Replies: 19

Views: 5K

Are the Laws of the Universe Influenced by the Structure of Our Brains?

Jan 28, 2012 · Replies 1 · Jan 28, 2012

Replies: 1

Views: 3K

Toroidal Universe: A 2003 Analysis

Mar 4, 2010 · Replies 16 · Jan 28, 2012

Replies: 16

Views: 9K

What happened to the center of the universe?

Jan 15, 2012 · Replies 19 · Jan 27, 2012

Replies: 19

Views: 5K

Black Holes Relation to an Accelerated Expanding Universe

Jan 25, 2012 · Replies 12 · Jan 27, 2012

Replies: 12

Views: 4K

Human Limitations of understanding.

Jan 25, 2012 · Replies 4 · Jan 27, 2012

Replies: 4

Views: 4K

How Do Scientists Use Zircons to Date the Earth's Formation?

Sep 15, 2011 · Replies 18 · Jan 26, 2012

Replies: 18

Views: 8K

Is There Such a Thing as Dark Time?

Jan 19, 2012 · Replies 30 · Jan 25, 2012

2

Replies: 30

Views: 6K

How does CMB support the predictions of inflation ?

Jan 21, 2012 · Replies 15 · Jan 24, 2012

Replies: 15

Views: 4K

Question about a torodial universe

Jan 23, 2012 · Replies 5 · Jan 24, 2012

Replies: 5

Views: 3K

Flatness-infiniteness logical problem

Jan 19, 2012 · Replies 11 · Jan 23, 2012

Replies: 11

Views: 3K

Critical density and observable mass

Jan 22, 2012 · Replies 4 · Jan 23, 2012

Replies: 4

Views: 4K

What would happen to black holes if Lambda increased?

Jan 22, 2012 · Replies 13 · Jan 23, 2012

Replies: 13

Views: 4K

Can Scientists Locate the Center of the Universe?

Jan 22, 2012 · Replies 3 · Jan 22, 2012

Replies: 3

Views: 3K

Liberate all the matter from a black hole

Jan 21, 2012 · Replies 31 · Jan 22, 2012

2

Replies: 31

Views: 2K

A thought experiment regarding the nature of space expansion

Jan 16, 2012 · Replies 30 · Jan 21, 2012

2

Replies: 30

Views: 5K

Is space-time flat or curved over time?

Mar 9, 2009 · Replies 7 · Jan 21, 2012

Replies: 7

Views: 21K

Singularity, Infinity, Edge, Expansion

Jan 17, 2012 · Replies 34 · Jan 20, 2012

2

Replies: 34

Views: 6K

Layman's question on Cosmic Microwave Background

Jan 19, 2012 · Replies 7 · Jan 20, 2012

Replies: 7

Views: 4K

Fridman's Equation: Understanding Lambda, K, and the Hubble Parameter

Jan 18, 2012 · Replies 6 · Jan 19, 2012

Replies: 6

Views: 3K

The Universe - infinite or not ?

Mar 16, 2003 · Replies 139 · Jan 19, 2012

5

Replies: 139

Views: 45K

Poll

'A Universe From Nothing' by Lawrence Krauss, AAI 2009

Oct 28, 2009 · Replies 63 · Jan 19, 2012

3

Replies: 63

Views: 27K

Gravity & Universe: Is Everything Falling?

Jun 14, 2011 · Replies 5 · Jan 19, 2012

Replies: 5

Views: 10K

Expanding Universe: What We See & How We Know

Jan 14, 2012 · Replies 33 · Jan 18, 2012

2

Replies: 33

Views: 6K

What is the basis for the theory that WIMPs could be detected by

Jan 18, 2012 · Replies 6 · Jan 18, 2012

Replies: 6

Views: 2K

What is the size of the universe

Jan 17, 2012 · Replies 5 · Jan 17, 2012

Replies: 5

Views: 3K

Can expansion be due to large-scale curvature?

Jan 16, 2012 · Replies 3 · Jan 17, 2012

Replies: 3

Views: 2K

Proxima Centauri closest star. super nova

Jan 11, 2012 · Replies 20 · Jan 16, 2012

Replies: 20

Views: 9K

Discovering the Universe's Flatness: Insights from an Amateur Astronomer

Dec 8, 2011 · Replies 13 · Jan 16, 2012

Replies: 13

Views: 5K

Fermions in Early Universe: Why We Ignore Them?

Jan 12, 2012 · Replies 3 · Jan 15, 2012

Replies: 3

Views: 3K

Universe radius 1,000 years ago?

Jan 2, 2012 · Replies 4 · Jan 15, 2012

Replies: 4

Views: 3K

Into what dimension is Spacetime Curved?

Jan 9, 2012 · Replies 23 · Jan 15, 2012

Replies: 23

Views: 7K

Can Planets Revolve Without Rotating and What Determines Their Direction?

Jan 10, 2012 · Replies 14 · Jan 15, 2012

Replies: 14

Views: 5K

Neutrinos & Gravity: Faster than Light?

Jan 12, 2012 · Replies 10 · Jan 15, 2012

Replies: 10

Views: 4K

Scanning pattern in Planck's maps

Jan 12, 2012 · Replies 4 · Jan 14, 2012

Replies: 4

Views: 2K

Inflation and accelerated expansion of the universe

Jan 13, 2012 · Replies 1 · Jan 13, 2012

Replies: 1

Views: 2K

Is There Experimental Proof of Dark Energy and Antigravity?

Jan 11, 2012 · Replies 3 · Jan 12, 2012

Replies: 3

Views: 2K

Ultimate fate of the universe via a Bose-Einstein condensate

Jan 10, 2012 · Replies 3 · Jan 11, 2012

Replies: 3

Views: 3K

Why Is the Universe Non-Uniform Despite Uniform Physical Laws?

Jan 2, 2012 · Replies 44 · Jan 11, 2012

2

Replies: 44

Views: 9K

The source of cosmic background radiation

Jan 10, 2012 · Replies 5 · Jan 11, 2012

Replies: 5

Views: 3K

If the universe is truly expanding, why aren't any stars getting dimmer?

Dec 25, 2011 · Replies 9 · Jan 11, 2012

Replies: 9

Views: 5K

Regarding Higgs boson and ether model

Jan 9, 2012 · Replies 1 · Jan 9, 2012

Replies: 1

Views: 4K

How well has the force of Dark Energy been calculated?

Jan 3, 2012 · Replies 26 · Jan 8, 2012

Replies: 26

Views: 7K

Distance expansion and escape velocity ( thought experiment )

Jan 8, 2012 · Replies 1 · Jan 8, 2012

Replies: 1

Views: 3K

Where Did the Original Matter Come From?

Jan 7, 2012 · Replies 8 · Jan 8, 2012

Replies: 8

Views: 4K

Dark Energy: Big Bang, Big Crunch & Expansion

Jan 6, 2012 · Replies 4 · Jan 7, 2012

Replies: 4

Views: 2K

Can quasars reactivate within an established galaxy?

Jan 4, 2012 · Replies 10 · Jan 7, 2012

Replies: 10

Views: 3K

The Cyclic Universe: A Theory of Formation and Evolution

Jan 3, 2012 · Replies 45 · Jan 6, 2012

2

Replies: 45

Views: 9K

Is There Infinite Matter in an Infinite Universe?

Jan 6, 2012 · Replies 2 · Jan 6, 2012

Replies: 2

Views: 3K

Universe of indistinguishable quanta?

Jan 4, 2012 · Replies 11 · Jan 6, 2012

Replies: 11

Views: 2K

Is the Universe's Energy Increasing Due to Dark Energy?

Jan 4, 2012 · Replies 6 · Jan 5, 2012

Replies: 6

Views: 2K

Special thread for answers to Mathbrain's questions

Nov 28, 2011 · Replies 31 · Jan 4, 2012

2

Replies: 31

Views: 7K

Modular Physics: Largest Number in the Universe

Jan 3, 2012 · Replies 8 · Jan 4, 2012

Replies: 8

Views: 3K

Why no attribution to Bohm regarding holographic principles

Dec 31, 2011 · Replies 3 · Jan 4, 2012

Replies: 3

Views: 5K

Topic: Neutrinos and Gravity: Can They Travel Faster in Contracted Space?

Jan 2, 2012 · Replies 19 · Jan 3, 2012

Replies: 19

Views: 4K

How do I become God? I want a promotion in the universe

Dec 30, 2011 · Replies 35 · Jan 3, 2012

2

Replies: 35

Views: 6K

Why do black holes appear to be eternal red instead of black?

Dec 29, 2011 · Replies 9 · Jan 3, 2012

Replies: 9

Views: 3K

Why is it considered the 'end of the universe' when the stars go dark?

Dec 30, 2011 · Replies 18 · Jan 3, 2012

Replies: 18

Views: 5K

Are Infinite Universes Compatible with M-Theory and Chaotic Inflation?

Dec 31, 2011 · Replies 7 · Jan 2, 2012

Replies: 7

Views: 4K

Is time measured at receding objects dilated?

Dec 28, 2011 · Replies 6 · Dec 31, 2011

Replies: 6

Views: 3K

What Are Entropy Perturbations in Cosmology?

Dec 18, 2011 · Replies 2 · Dec 29, 2011

Replies: 2

Views: 4K

Can We Aim Our Telescopes Towards the Edge of the Universe?

Dec 26, 2011 · Replies 3 · Dec 29, 2011

Replies: 3

Views: 3K

Time can't exist without matter (mass) and motion

Oct 26, 2007 · Replies 65 · Dec 28, 2011

3

Replies: 65

Views: 29K

Does the Universe Ever Reach Maximum Entropy?

Dec 27, 2011 · Replies 1 · Dec 28, 2011

Replies: 1

Views: 3K

Sitting on a (very) extended object in space

Dec 27, 2011 · Replies 1 · Dec 27, 2011

Replies: 1

Views: 2K

Could a Supermassive Black Hole be the Center of our Finite Universe?

Dec 22, 2011 · Replies 14 · Dec 26, 2011

Replies: 14

Views: 4K

New Teacher Seeks Help on Universe Expansion & Space

Nov 16, 2011 · Replies 86 · Dec 24, 2011

3

Replies: 86

Views: 18K

What is the True Meaning of 'Nothing' in A Universe from Nothing?

Dec 23, 2011 · Replies 3 · Dec 23, 2011

Replies: 3

Views: 4K

Are You Using the Correct Formula to Convert Redshift to Megaparsecs?

Dec 21, 2011 · Replies 2 · Dec 23, 2011

Replies: 2

Views: 15K

How Universe is Born: Start of Universe

Dec 23, 2011 · Replies 1 · Dec 23, 2011

Replies: 1

Views: 2K

How do we know space is not infinite?

Sep 9, 2011 · Replies 126 · Dec 23, 2011

5

Replies: 126

Views: 32K

How long ago did inflation end in the universe?

Dec 21, 2011 · Replies 12 · Dec 23, 2011

Replies: 12

Views: 3K

Are thermalized neutrinos stable at temperatures their rest energy?

Dec 21, 2011 · Replies 4 · Dec 22, 2011

Replies: 4

Views: 4K

Some clarity on Black Hole Theory and Observations.

Dec 16, 2011 · Replies 14 · Dec 22, 2011

Replies: 14

Views: 5K

Current value of the scale factor(R₀)?

Dec 20, 2011 · Replies 8 · Dec 21, 2011

Replies: 8

Views: 3K

What is the current value of the scale factor?

Jul 11, 2008 · Replies 5 · Dec 21, 2011

Replies: 5

Views: 11K

Has the Universe's Entropy Decreased Over Time?

Dec 20, 2011 · Replies 2 · Dec 21, 2011

Replies: 2

Views: 3K

Weinberg's Cosmology: Neglecting (1+z(eq)) in Denominator

Dec 20, 2011 · Replies 2 · Dec 20, 2011

Replies: 2

Views: 2K

I'd like to know your interpretation.

Dec 18, 2011 · Replies 10 · Dec 20, 2011

Replies: 10

Views: 3K

Why Doesn't Dark Matter Collapse into Black Holes Like Regular Matter?

Dec 13, 2011 · Replies 13 · Dec 19, 2011

Replies: 13

Views: 4K

Protogalactic clouds vs protogalaxies help

Dec 17, 2011 · Replies 2 · Dec 18, 2011

Replies: 2

Views: 2K

Is the Big Bang the Only Explanation for the Universe's Nature?

Dec 18, 2011 · Replies 21 · Dec 18, 2011

Replies: 21

Views: 3K

Some repetitive mistakes and misconceptions about DM, MOND, TeVeS, and cosmology

Dec 18, 2011 · Replies 1 · Dec 18, 2011

Replies: 1

Views: 3K

Simple proof that the zero-point energy spectrum is Lorentz Invariant?

Aug 26, 2011 · Replies 3 · Dec 18, 2011

Replies: 3

Views: 4K

Can a Particle with Repulsive Properties Explain Dark Matter and Dark Energy?

Nov 30, 2011 · Replies 28 · Dec 18, 2011

Replies: 28

Views: 9K

Particle horizon in Lemaître model

Dec 18, 2011 · Replies 1 · Dec 18, 2011

Replies: 1

Views: 2K

Can Space Warp Independently of Mass?

Dec 2, 2011 · Replies 13 · Dec 18, 2011

Replies: 13

Views: 4K

Why the universe is expanding faster and faster

Apr 18, 2007 · Replies 49 · Dec 17, 2011

2

Replies: 49

Views: 29K

What is the total energy of the universe?

Dec 15, 2011 · Replies 5 · Dec 17, 2011

Replies: 5

Views: 4K

Are supermassive black holes just big stars?

Dec 15, 2011 · Replies 11 · Dec 16, 2011

Replies: 11

Views: 4K

Can the Universe's Path be Definitively Determined?

Dec 14, 2011 · Replies 16 · Dec 16, 2011

Replies: 16

Views: 4K

What Existed Before the Big Bang?

Dec 8, 2011 · Replies 21 · Dec 16, 2011

Replies: 21

Views: 6K

Data to derive Hubble's constant

Dec 12, 2011 · Replies 2 · Dec 14, 2011

Replies: 2

Views: 4K

Why is There Space in the Universe?

Dec 9, 2011 · Replies 24 · Dec 13, 2011

Replies: 24

Views: 13K

Did Matter Really Exceed the Speed of Light During the Big Bang?

Dec 13, 2011 · Replies 2 · Dec 13, 2011

Replies: 2

Views: 3K

Cosmology

Cosmology is the scientific study of the large-scale structure, origin, evolution, and ultimate fate of the universe. It seeks to understand the fundamental nature of the cosmos, including the distribution of galaxies, dark matter, dark energy, and the overall geometry of space-time. Cosmologists explore the early moments of the universe, moments after the Big Bang, and employ various observational tools, such as telescopes and satellites, to gather data that informs our understanding of cosmic evolution.

Key concepts in cosmology include the expansion of the universe, cosmic microwave background radiation, and the formation of galaxies and large-scale structures. It is a field that intersects with physics, astronomy, and astrophysics, providing insights into the vast and intricate tapestry of the cosmos.

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