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.
Undergrad What is the chemical makeup of stars and how does it affect their lifespan?
  • · Replies 7 ·
Replies
7
Views
3K
Graduate Another large scale structure of the universe idea
  • · Replies 4 ·
Replies
4
Views
3K
Graduate Inflation Theory: Matter-Antimatter Annihilation Concept
  • · Replies 5 ·
Replies
5
Views
3K
Graduate Galaxy at redshift z=8.6 (the actual paper)
  • · Replies 1 ·
Replies
1
Views
3K
Graduate How Is the Distance to the CMB Measured and How Does It Relate to Its Structure?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Does the universe need an escape velocity?
  • · Replies 12 ·
Replies
12
Views
8K
Graduate How Do Critical Density and CMB Irregularities Explain the Universe's Shape?
  • · Replies 2 ·
Replies
2
Views
2K
CERN scientists eye parallel universe breakthrough
  • · Replies 2 ·
Replies
2
Views
3K
Graduate Superstring Cosmology: Compactifying 7 Dimensions
  • · Replies 5 ·
Replies
5
Views
3K
Undergrad How do I normalize the likelihood distribution?
  • · Replies 8 ·
Replies
8
Views
5K
Undergrad Is the Big Bang Theory Debunked?
  • · Replies 55 ·
2
Replies
55
Views
20K
Undergrad Are Wormholes the Key to Unlocking the Universe's Secrets?
  • · Replies 6 ·
Replies
6
Views
4K
Graduate Could Dark Energy be Caused by a Slow Shift in the Base State?
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Inflation and initial conditions
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Dark matter and keplerian revolution
  • · Replies 19 ·
Replies
19
Views
3K
High School The Grand Design - Stephen Hawking and Leonard Mlodinow
  • · Replies 5 ·
Replies
5
Views
3K
Undergrad From physics how can we figure out how old the earth and the universe is?
  • · Replies 7 ·
Replies
7
Views
2K
Graduate Can a "Dead Universe" be Revived?
  • · Replies 8 ·
Replies
8
Views
3K
Graduate How is the Final Velocity of Star Movements Calculated?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Can FLRW metric be taken to describe stretching in time rather than space?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Quasar Alignment to Cosmic Strings
  • · Replies 5 ·
Replies
5
Views
4K
Graduate Expanding Present Time Universe at Omega 0 = 1: Help Needed
  • · Replies 8 ·
Replies
8
Views
2K
Undergrad Galaxies on the Edge: Understanding the Expansion of the Universe
  • · Replies 5 ·
Replies
5
Views
2K
Graduate What caused the expansion of the universe for the 1st 7 billion years?
  • · Replies 10 ·
Replies
10
Views
4K
Graduate What is the relationship between mathematical structures and real existence?
  • · Replies 8 ·
Replies
8
Views
4K
Graduate Is the Expansion of the Universe Driven by Mass?
  • · Replies 22 ·
Replies
22
Views
8K
Graduate Cosmological Constant: Dark Energy vs Gravity Ratio
  • · Replies 18 ·
Replies
18
Views
5K
Graduate Are Distant Globular Clusters the Key to Testing Newtonian Gravity?
  • · Replies 19 ·
Replies
19
Views
3K
Graduate If Big Crunch = True, then Reincarnation = True?
  • · Replies 18 ·
Replies
18
Views
11K
Graduate Origin of Dark Energy: Before the Big Bang
  • · Replies 7 ·
Replies
7
Views
2K
Graduate How many methods for dating a galaxy
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Was the Universe Really Chaotic Right After the Big Bang?
  • · Replies 15 ·
Replies
15
Views
5K
Graduate Explore the Possibility of Other Universes with Hawking's "The Grand Design
  • · Replies 11 ·
Replies
11
Views
3K
Undergrad Was the Moon Ever Touching Earth Billions of Years Ago?
  • · Replies 10 ·
Replies
10
Views
6K
Graduate Dark Energy, Light, the Universe, and Black Holes
  • · Replies 4 ·
Replies
4
Views
3K
Graduate Some questions about energy conservation
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Why Doesn't Light from the Big Bang Get Stretched Out?
  • · Replies 10 ·
Replies
10
Views
3K
Graduate Will the Planck Satellite Illuminate Loop Quantum Cosmology Insights?
  • · Replies 7 ·
Replies
7
Views
3K
Undergrad Theory of the end of the universe
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Exploring Primordial Universe w/ QUBIC: 400 Horns at 100 mK in Antarctica
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Is the Universe Analogous to Water with Entropy and Symmetry?
  • · Replies 6 ·
Replies
6
Views
3K
Graduate Understanding Radiation Pressure and Its Role in Star Dynamics
  • · Replies 4 ·
Replies
4
Views
3K
Graduate Could Dark Energy Be Linked to a Primordial Mother-Universe?
  • · Replies 5 ·
Replies
5
Views
2K
Graduate What made the universe have 3 dimensions, instead of some other number?
  • · Replies 42 ·
2
Replies
42
Views
12K
Graduate Variation of fine structure constant and spacetime?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Size of the universe and human brain
  • · Replies 6 ·
Replies
6
Views
3K
Graduate Eternal Inflation Time Will End
  • · Replies 5 ·
Replies
5
Views
3K
High School How are clusters of galaxies formed?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Is the Cosmological Principle Limited to Space Only?
  • · Replies 136 ·
5
Replies
136
Views
23K
Graduate What is the relationship between spacetime and energy?
  • · Replies 4 ·
Replies
4
Views
3K
Graduate Particles in our universe undetectable by us
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Is the Standard Model of Cosmology built on a house of cards?
  • · Replies 26 ·
Replies
26
Views
5K
Graduate Can the Li7 problem be resolved by increasing the dark matter ratio?
  • · Replies 3 ·
Replies
3
Views
2K
Graduate How Does B Mode Polarization Help Trace Gravitational Radiation?
  • · Replies 5 ·
Replies
5
Views
9K
Graduate About the origin of the universe? big bang cause?
  • · Replies 12 ·
Replies
12
Views
4K
Graduate What Happens Inside a Black Hole's Event Horizon?
  • · Replies 105 ·
4
Replies
105
Views
20K
Graduate Was the Universe Always Infinite from the Moment of the Big Bang?
  • · Replies 10 ·
Replies
10
Views
4K
Graduate Are Matter and Space-Time the Only Things That Exist in Our Universe?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate What/how created first brane? first source of everything what/how
  • · Replies 3 ·
Replies
3
Views
3K
Graduate What Are the Key Questions About Supernova Data and the Modified Milne Model?
  • · Replies 116 ·
4
Replies
116
Views
25K
Graduate How dark energy make universe to inflate?
  • · Replies 28 ·
Replies
28
Views
6K
Undergrad Could Black Holes Be Tears in Space?
  • · Replies 14 ·
Replies
14
Views
5K
Graduate Were There Any Proposed Non-Expanding Cosmological Models Without Lambda?
  • · Replies 56 ·
2
Replies
56
Views
10K
Graduate Is the Planck Length real? How do we know?
  • · Replies 47 ·
2
Replies
47
Views
16K
Graduate Identifying the Inflaton (new paper Easson et al)
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Looking Back Through Spacetime in the Future
  • · Replies 5 ·
Replies
5
Views
3K
Graduate Yet another Dark Energy question
  • · Replies 5 ·
Replies
5
Views
2K
Graduate Used infinity to predict that another ClamShell
  • · Replies 8 ·
Replies
8
Views
3K
Graduate On String Theory's Predictiveness
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Is the Big Bang Expanding into a Preexisting Void?
  • · Replies 77 ·
3
Replies
77
Views
23K
Graduate Time at the edge of the universe
  • · Replies 10 ·
Replies
10
Views
6K
Graduate Impact of Free Will: How Much Can We Alter Universe?
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Dark Matter Distribution Around Galaxies
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Fine Structure Constant appears to vary across the distant sky
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Is the Hubble Red-Shift Gravitational Instead of Doppler?
  • · Replies 14 ·
Replies
14
Views
4K
Graduate Where was the big bang singularity?
  • · Replies 58 ·
2
Replies
58
Views
15K
Graduate After Big Bang: What if Anti Mass Had Upperhand?
  • · Replies 27 ·
Replies
27
Views
12K
Graduate Cosmology Questions That Have Perplexed Me Over the Years
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Fine structure constant probably doesn't vary with direction in space
  • · Replies 124 ·
5
Replies
124
Views
24K
Graduate Quick question about the properties of dark matter/energy
  • · Replies 5 ·
Replies
5
Views
2K
Graduate Virtual particles and accelerated expansion
  • · Replies 10 ·
Replies
10
Views
3K
Graduate Curvature in a Universe with No Cosmological Constant and Zero Density
  • · Replies 34 ·
2
Replies
34
Views
10K
Undergrad Susskind and Hawking on hard determinism
  • · Replies 47 ·
2
Replies
47
Views
13K
Graduate Why is the speed of light in a vacuum ~299,793 km/s?
  • · Replies 24 ·
Replies
24
Views
6K
Undergrad Infinitely Old Earth: Cambridge A Level Physics Student
  • · Replies 10 ·
Replies
10
Views
3K
Graduate Creation of Matter: Higgs Boson & Other Explanations
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Evaporating black holes, a kind of flux of space?
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Our Universe then and now, energy verses space.
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Thoughts on Hawking's No-Boundary Proposal of Universe
  • · Replies 9 ·
Replies
9
Views
3K
Graduate Is Entropy the Key to Understanding Time in an Expanding Universe?
  • · Replies 4 ·
Replies
4
Views
2K
Can Love Transcend Across Parallel Universes?
  • · Replies 17 ·
Replies
17
Views
20K
Graduate Where did the energy and mass in the singularity come from?
  • · Replies 2 ·
Replies
2
Views
4K
High School Big Bang: Discovering the Reasons Behind Its Occurrence
  • · Replies 105 ·
4
Replies
105
Views
21K
Graduate Calcluating the Hubble Radius for an open universe?
  • · Replies 9 ·
Replies
9
Views
4K
Graduate What happens to time when spacetime expands
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Is the Universe in an Eternal Cycle of Expansion and Rebirth?
  • · Replies 58 ·
2
Replies
58
Views
11K
Undergrad Is Everything in the Universe Made of Wavelengths?
  • · Replies 4 ·
Replies
4
Views
4K
Undergrad What is the connection between Olber's paradox and the age of the universe?
  • · Replies 6 ·
Replies
6
Views
3K
Graduate Temperature can it alter space time
  • · Replies 16 ·
Replies
16
Views
5K
Graduate Gravity center; Virtual particles near BH; Motion reality; Universe contracting
  • · Replies 24 ·
Replies
24
Views
5K