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 Could dark matter have gamma-ray absorption lines?
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Small scale effects of expansion, and 'bound' objects
  • · Replies 16 ·
Replies
16
Views
4K
Graduate How do we define 'Earth like planet'
  • · Replies 20 ·
Replies
20
Views
8K
Graduate Dark Energy, Dark Matter, and Empty Space
  • · Replies 8 ·
Replies
8
Views
7K
Graduate Need help learning about Dark Matter
  • · Replies 5 ·
Replies
5
Views
3K
Graduate Does Space Expand? What Do You Think?
  • · Replies 176 ·
6
Replies
176
Views
42K
Graduate The meaning of the curvature term
  • · Replies 6 ·
Replies
6
Views
5K
Graduate Cosmo calculator-recession speed tutorial
  • · Replies 67 ·
3
Replies
67
Views
31K
Graduate Cantor, infinity and cosmology
  • · Replies 24 ·
Replies
24
Views
5K
Graduate Hubble's law and cosmological density
  • · Replies 20 ·
Replies
20
Views
5K
Graduate Does Creation of Energy in Universe Violate Conservation of Energy?
  • · Replies 13 ·
Replies
13
Views
5K
High School I understanding the edge of the universe
  • · Replies 5 ·
Replies
5
Views
3K
Graduate Is order a natural occurrence or a result of chaos?
  • · Replies 7 ·
Replies
7
Views
2K
Graduate What Are the Major Conflicts with Standard Cosmology Models?
  • · Replies 16 ·
Replies
16
Views
6K
Graduate How Can an Infinite Universe Have Finite Energy?
  • · Replies 45 ·
2
Replies
45
Views
11K
Graduate How Can the Big Bang Be Visible Everywhere in the Universe?
  • · Replies 7 ·
Replies
7
Views
3K
Graduate Gnawing questions about the Edge of our Universe
  • · Replies 4 ·
Replies
4
Views
3K
Undergrad Is Anti-Matter Hiding in the Universe as Dark Matter?
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Are galaxies moving faster than the speed of light?
  • · Replies 46 ·
2
Replies
46
Views
13K
Graduate Dark matter and gravitational pull of energy
  • · Replies 2 ·
Replies
2
Views
3K
Graduate Where can i find tensor analysis expained physically in simplest words?
  • · Replies 8 ·
Replies
8
Views
5K
Graduate Redshift Effect on Absorption/Emission Lines
  • · Replies 6 ·
Replies
6
Views
4K
Graduate What is the conflict between General theory of relativity and Quantum theory?
  • · Replies 38 ·
2
Replies
38
Views
20K
Dark Matter Core Defies Explanation
  • · Replies 28 ·
Replies
28
Views
6K
Graduate Why don't we see the other dimensions ?
  • · Replies 2 ·
Replies
2
Views
4K
Graduate Time curvature and twin paradox.
  • · Replies 24 ·
Replies
24
Views
5K
Graduate Understanding Universe from laws extracted from the Universe?
  • · Replies 5 ·
Replies
5
Views
3K
Graduate Does any gravitating body emit Hawking radiation?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Will the Universe End in a Big Crunch?
  • · Replies 35 ·
2
Replies
35
Views
8K
Graduate Exploring Black Hole Anatomy: The Singularity, Event Horizon, and Photon Sphere
  • · Replies 67 ·
3
Replies
67
Views
11K
Undergrad Newbie question about expanding universe
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad What lies beyond the visible universe?
  • · Replies 1 ·
Replies
1
Views
4K
Graduate List of Questions about Black Holes
  • · Replies 15 ·
Replies
15
Views
4K
Graduate What Are Essential Papers on Big Bang and Energy Origins?
  • · Replies 2 ·
Replies
2
Views
3K
Graduate How comes the big bang singularity didn't need space and time?
  • · Replies 6 ·
Replies
6
Views
5K
Graduate What are the Physical effects of the expansion of the Universe
  • · Replies 5 ·
Replies
5
Views
3K
Graduate Age of the Universe: Can We Assign an Exact Age?
  • · Replies 2 ·
Replies
2
Views
3K
Undergrad What is a wormhole and how does it relate to the universe and space?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Can We Witness the Big Bang with FTL Travel?
  • · Replies 5 ·
Replies
5
Views
2K
Graduate Is the Universe Finite or Infinite?
  • · Replies 115 ·
4
Replies
115
Views
26K
Stephen Hawking starring in The big bang thoery.
  • · Replies 12 ·
Replies
12
Views
3K
Is the Multiverse Theory Changing Our Understanding of Cosmology?
  • · Replies 78 ·
3
Replies
78
Views
18K
Graduate Distances to galaxies using the Hubble Relation: look-back time
  • · Replies 17 ·
Replies
17
Views
5K
High School What Geomagnetic Storms release proton or electron?
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Dark energy expansion and the Hubble diagram
  • · Replies 1 ·
Replies
1
Views
2K
Graduate The Significance of Pi: Is It Related to Spatial Dimensions?
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Scalefactor calculations for special cases using the Friedmann Equation
  • · Replies 6 ·
Replies
6
Views
3K
Undergrad Dark matter - observational evidence
  • · Replies 14 ·
Replies
14
Views
5K
High School Uncovering the Mystery of Anti-Matter in Our Galaxy
  • · Replies 5 ·
Replies
5
Views
3K
Graduate Maximum entropy implies linear expansion?
  • · Replies 7 ·
Replies
7
Views
3K
Graduate Light elements abundance in a static toy universe
  • · Replies 69 ·
3
Replies
69
Views
12K
Graduate What is the total entropy of the universe today
  • · Replies 11 ·
Replies
11
Views
5K
The expansion of the universe art video
  • · Replies 10 ·
Replies
10
Views
2K
Graduate LQC Lambda-CDM model bounce radius
  • · Replies 2 ·
Replies
2
Views
4K
Graduate Does the expansion of space only occur in unbound systems?
  • · Replies 6 ·
Replies
6
Views
4K
Graduate Transferring Matter between Bubble Universes
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Where Does Our Universe Exist in Relation to Branes?
  • · Replies 1 ·
Replies
1
Views
3K
Graduate What are the Main Theories for the Current State and Structure of the Universe?
  • · Replies 3 ·
Replies
3
Views
3K
Graduate How Does Expansion Effect the Frequency of Light
  • · Replies 4 ·
Replies
4
Views
4K
Graduate Inflation and electroweak and GUT vacuum
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Did Space Really Expand or Is It Just a Misinterpretation?
  • · Replies 2 ·
Replies
2
Views
3K
Graduate BLACK MATTER what is it? wheres it come from?
  • · Replies 15 ·
Replies
15
Views
5K
Graduate Dark energy, matter in a Multiverse Schemata
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Why is the Universe the Way it is?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Who said aether viscosity is ridiculously large ?
  • · Replies 26 ·
Replies
26
Views
5K
High School Can Black Holes Grow, Merge, and Affect the Universe's End?
  • · Replies 17 ·
Replies
17
Views
5K
Graduate Why does comoving Hubble radius increase with time?
  • · Replies 11 ·
Replies
11
Views
6K
Graduate Age of a vaccum energy dominated universe
  • · Replies 7 ·
Replies
7
Views
3K
Graduate Black Hole & Black Body Radiation: Why Can't It Absorb?
  • · Replies 6 ·
Replies
6
Views
3K
Graduate Development of dimensional universe since big bang.
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Inflaton Field and Boucne Models
  • · Replies 7 ·
Replies
7
Views
3K
Graduate Non-ballistic big bang and expansion not from a center
  • · Replies 67 ·
3
Replies
67
Views
19K
High School Closest Habitable Planet: Gliese 581g | 79 Year Trip?
  • · Replies 17 ·
Replies
17
Views
4K
Graduate Unifying GR + EM: Inflation & Gravity Effects
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Why does light and gravity travel at the same speed?
  • · Replies 57 ·
2
Replies
57
Views
12K
Impossible Thought: Galaxy Traveling at Light Speed, Milky Way Merging/Ripping
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Spacetime: Stretching or Growing? Or
  • · Replies 29 ·
Replies
29
Views
8K
Graduate Density Parameter for radiation dominated universe
  • · Replies 3 ·
Replies
3
Views
4K
Graduate Metric Perturbation: Finding Info for Einstein's Field Equation
  • · Replies 1 ·
Replies
1
Views
3K
Graduate Could The Universe be a Wave emanating from a greater source?
  • · Replies 1 ·
Replies
1
Views
2K
High School Is the Universe Truly Unbounded?
  • · Replies 18 ·
Replies
18
Views
5K
Graduate Time and distance relative to an expanding universe
  • · Replies 9 ·
Replies
9
Views
4K
Graduate Neutrinos Interaction with EH of Black Holes
  • · Replies 11 ·
Replies
11
Views
4K
Graduate Duration of the original CMB radiation
  • · Replies 2 ·
Replies
2
Views
3K
Undergrad What is the expansion of the universe
  • · Replies 40 ·
2
Replies
40
Views
8K
Undergrad Where is the center of the universe?
  • · Replies 233 ·
8
Replies
233
Views
49K
Graduate How is the age of the universe determined through light and cosmic expansion?
  • · Replies 17 ·
Replies
17
Views
5K
Graduate Could Black Holes Be Cosmic Centrifuges?
  • · Replies 4 ·
Replies
4
Views
3K
Graduate Is There a Weak Repulsive Force of Empty Space in the Universe?
  • · Replies 6 ·
Replies
6
Views
4K
Graduate Applying the uncertinty principle to the big bang
  • · Replies 2 ·
Replies
2
Views
2K
Graduate I've got my FTL boots on (another silly black hole question)
  • · Replies 24 ·
Replies
24
Views
6K
Undergrad Is the Shapiro time delay effect accepted in science ?
  • · Replies 8 ·
Replies
8
Views
4K
Graduate Cluster Intergalactic Gas Heating & Cooling Problem
  • · Replies 6 ·
Replies
6
Views
6K
How Big Is the Universe?
  • · Replies 21 ·
Replies
21
Views
15K
Graduate Questions regarding the Cause of the Universe
  • · Replies 12 ·
Replies
12
Views
3K
Graduate Center of the Universe - Is it Possible?
  • · Replies 62 ·
3
Replies
62
Views
16K
Graduate The End of the Universe: A Black Hole Solution?
  • · Replies 54 ·
2
Replies
54
Views
11K
Undergrad Hello and a question about our universe
  • · Replies 18 ·
Replies
18
Views
5K
Graduate Universe as a cellular automaton
  • · Replies 4 ·
Replies
4
Views
3K
Graduate Rest frames in the early universe?
  • · Replies 3 ·
Replies
3
Views
3K