Cosmology Forum

Post thread
Join in expert discussion on topics revolving around cosmology. Cosmology is the origin, evolution, structure and eventual fate of the universe.
Graduate Did inflation set off the universe?
  • · Replies 19 ·
Replies
19
Views
3K
Graduate Video talk on Planck results by Kendrick Smith
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Black Hole Singularity of a Universe
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad How can the big bang allow infinate universes
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Is the Universe Infinite or Does It Have a Center?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Observational Cosmology & LCDM Model: What We Know
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Searching for Dark Energy, Dark Matter & Gravitational Radiation
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Our ideas on v_rec/c column added to J's calculator
  • · Replies 31 ·
2
Replies
31
Views
4K
Undergrad Does three Dimension realy exsist and why?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Report on expansion history of universe
  • · Replies 3 ·
Replies
3
Views
2K
Is Dark Matter Finally Revealing Its Secrets?
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad How exactly does the universe expand?
  • · Replies 16 ·
Replies
16
Views
4K
Graduate Stress Energy Tensor - Confusion about signs and metrics
  • · Replies 2 ·
Replies
2
Views
2K
Graduate What Was the Initial Energy of the Universe: Planck Energy or Singularity?
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Could Dark Energy be concentrated inside galactic bubbles?
  • · Replies 5 ·
Replies
5
Views
2K
Graduate Cosmological Observations Conundrum
  • · Replies 43 ·
2
Replies
43
Views
9K
Graduate Is Big Bang a Misleading Term for Describing the Early Universe?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Is the Solar system expanding with the Universe?
  • · Replies 7 ·
Replies
7
Views
6K
Graduate The awkward expression 1 km/s per Mpc-the radius is better
  • · Replies 12 ·
Replies
12
Views
4K
Is the Universe Organized or Chaotic in its Younger Years?
  • · Replies 11 ·
Replies
11
Views
3K
Graduate Shape of Universe: Is Flatness Approved? Causes of Big Crunch
  • · Replies 119 ·
4
Replies
119
Views
17K
Undergrad Is there a place in the Universe without any matter and energy?
  • · Replies 12 ·
Replies
12
Views
12K
Graduate It's a rate (not a constant) so let's call it that
  • · Replies 8 ·
Replies
8
Views
3K
Graduate Nature of spacetime and interest in the field
  • · Replies 1 ·
Replies
1
Views
2K
Graduate What's the latest update on the possible discovery of dark matter?
  • · Replies 13 ·
Replies
13
Views
3K
Graduate What is the relationship between light and space?
  • · Replies 7 ·
Replies
7
Views
5K
Graduate Which Planck numbers to use? (Ned Wright's choice?)
  • · Replies 10 ·
Replies
10
Views
3K
Graduate Thoughts/Questions about GR and dark matter
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Would Dark Energy Alter Layzer's Entropy Model?
  • · Replies 8 ·
Replies
8
Views
3K
Graduate Formula for the dark energy density (dark energy formula)
  • · Replies 5 ·
Replies
5
Views
6K
Graduate Challenging the Big Bang: Addressing Objections to the Expanding Universe Theory
  • · Replies 13 ·
Replies
13
Views
9K
Graduate Redshift at 11.9 and the Hubble Constant
  • · Replies 11 ·
Replies
11
Views
4K
Graduate Is it wrong to see the bang as insertion of space?
  • · Replies 8 ·
Replies
8
Views
3K
Graduate Cosmological redshift, how fast can the universe expand?
  • · Replies 16 ·
Replies
16
Views
4K
Graduate Given expansion, finally each particle will have only 1 neighbor
  • · Replies 10 ·
Replies
10
Views
2K
Graduate Why Stephen Hawking says universe can create itself from nothing?
  • · Replies 81 ·
3
Replies
81
Views
17K
Graduate Singularity Paradoxes: Nothing or Something?
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Did Quasars Play a Role in the Formation of Galaxies?
  • · Replies 17 ·
Replies
17
Views
4K
Conspiratorial cosmology - the case against the Universe
  • · Replies 1 ·
Replies
1
Views
2K
Graduate When Will the Big Crunch Happen According to Current Models?
  • · Replies 37 ·
2
Replies
37
Views
6K
Redshift FAQ article development
  • · Replies 142 ·
5
Replies
142
Views
19K
Graduate Is Inflation the Key to Understanding a Flat Universe?
  • · Replies 12 ·
Replies
12
Views
3K
Undergrad How big was the Universe 13 billion years ago?
  • · Replies 41 ·
2
Replies
41
Views
11K
Graduate Energy has mass & therefore gravity. Yet dark energy is repulsive ?
  • · Replies 5 ·
Replies
5
Views
3K
Graduate How did the CMB Lorentz frame get chosen?
  • · Replies 5 ·
Replies
5
Views
3K
Graduate Does the boundary of the causal universe function as an event horizon?
  • · Replies 18 ·
Replies
18
Views
5K
Undergrad Cosmological constant calculation
  • · Replies 5 ·
Replies
5
Views
3K
Graduate Higgs/vacuum stability and the universe
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Definiton of Schwarzschild radius clarification request
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad How should I see the CMB picture
  • · Replies 3 ·
Replies
3
Views
2K
Graduate A Gravitational Entropy proposal from Ellis, Tavakol, and Clifton
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Possible reason for dark energy (?)
  • · Replies 16 ·
Replies
16
Views
3K
Graduate What slowed or stopped inflation?
  • · Replies 15 ·
Replies
15
Views
3K
Graduate Article on New Planck Satellite data
  • · Replies 20 ·
Replies
20
Views
5K
Graduate Composition of the Universe can be Derived from PI?
  • · Replies 21 ·
Replies
21
Views
5K
Interesting facts about the Universe
  • · Replies 1 ·
Replies
1
Views
2K
Graduate A history of the universe using the new Planck numbers
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Where in the universe am I absolutely still ?
  • · Replies 5 ·
Replies
5
Views
2K
Graduate Large Scale anomaly in Planck data
  • · Replies 11 ·
Replies
11
Views
4K
Graduate Is Wikipedia's Explanation of Olber's Paradox Misleading?
  • · Replies 14 ·
Replies
14
Views
4K
Graduate The Higgs mechanism and the Beginning of the Universe
  • · Replies 22 ·
Replies
22
Views
7K
Graduate Planck Mission Reveals Universe Features: String Theory Hits
  • · Replies 5 ·
Replies
5
Views
2K
Graduate Inflation of singularity at moment of evaporation?
  • · Replies 9 ·
Replies
9
Views
3K
What Exciting Discoveries Will the Live Planck Results Reveal?
  • · Replies 10 ·
Replies
10
Views
3K
Undergrad Evolution of a star from a nebula
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Is the universe large and finite, or infinite?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate How can the universe be infinite, if it has a finite age?
  • · Replies 1 ·
Replies
1
Views
6K
Graduate What is a Vacuum in General Relativity?
  • · Replies 8 ·
Replies
8
Views
4K
Undergrad Gravitation as answer to whether the Universe is infinite?
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Interpreting Gravitational Lensing Images?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Is Dark Matter Absorbing Photons and Emitting Undetectable Radiation?
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Differences between polarisations and temperature anisotropies in the
  • · Replies 1 ·
Replies
1
Views
2K
High School Looking for some good websites for Physics and Cosmology
  • · Replies 3 ·
Replies
3
Views
4K
Graduate Normal&good question about redshift
  • · Replies 8 ·
Replies
8
Views
3K
Graduate Could the universe just be a piece of something bigger?
  • · Replies 13 ·
Replies
13
Views
4K
Graduate Is dark energy or dark matter created to keep the Cosmological constant
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Evidence of Dark Matter within the Solar System?
  • · Replies 30 ·
2
Replies
30
Views
6K
Graduate Gravitational Waves: Cosmic Inflation Equation
  • · Replies 11 ·
Replies
11
Views
3K
Graduate Is the big bang singularity really a rapid expansion of spacetime?
  • · Replies 11 ·
Replies
11
Views
3K
Graduate Rethinking Cosmology (Steinhardt)
  • · Replies 27 ·
Replies
27
Views
6K
High School Why are we crashing with Andromeda?
  • · Replies 20 ·
Replies
20
Views
4K
Graduate Dark Energy Confusion - Unraveling the Mystery
  • · Replies 12 ·
Replies
12
Views
3K
Graduate Poincaré recurrence and maximum entropy
  • · Replies 4 ·
Replies
4
Views
3K
When Will We Know If Planck Discovered B Mode Polarisation?
  • · Replies 9 ·
Replies
9
Views
3K
Graduate Largest structure in the universe discovered so far
  • · Replies 7 ·
Replies
7
Views
2K
Graduate Original location of the Big Bang
  • · Replies 42 ·
2
Replies
42
Views
26K
Graduate Why Isn't the Entire Universe a Black Hole Despite the Big Bang Singularity?
  • · Replies 28 ·
Replies
28
Views
7K
Graduate Would a Universe be considered part of the standard model?
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Is Gravitational Energy Truly Negative in a Zero-Energy Universe?
  • · Replies 5 ·
Replies
5
Views
3K
Graduate Inflation, as a tool for supersymmetry breaking
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Questions on observational cosmology
  • · Replies 3 ·
Replies
3
Views
2K
Graduate What is the source of dark energy?
  • · Replies 6 ·
Replies
6
Views
4K
Graduate Gravitino production in the early universe.
  • · Replies 1 ·
Replies
1
Views
2K
Graduate What are e-foldings and how are they used in various fields of study?
  • · Replies 3 ·
Replies
3
Views
20K
Time Magazine: Dark Matter May Not Exist At All
  • · Replies 3 ·
Replies
3
Views
3K
Undergrad Accelerating Universe: Stephen Hawking, Carl Sagan, Arthur C. Clarke
  • · Replies 13 ·
Replies
13
Views
3K
Graduate Probability of stars in a multiverse
  • · Replies 61 ·
3
Replies
61
Views
11K
Graduate Is There Evidence for the Universe's Expansion and a Constant Speed of Light?
  • · Replies 3 ·
Replies
3
Views
3K
Undergrad Does the Universe have a Frame Rate ?
  • · Replies 11 ·
Replies
11
Views
8K
Graduate Is there a limit to the universe's expansion?
  • · Replies 17 ·
Replies
17
Views
4K