Cosmology Forum

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Join in expert discussion on topics revolving around cosmology. Cosmology is the origin, evolution, structure and eventual fate of the universe.
B Is the Universe's age 13.7B years in a particular frame?
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354
B History of Cosmology
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316
B The expanding universe (an analogy) I
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2
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128
B How does gravity's warping of spacetime appear first among the forces?
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1
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114
B Celestial objects in the very far future
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11
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284
B Which statement is more accurate? (Hubble's redshift vs. Hubble's law)
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13
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321
B Images with CMB used to Illuminate Dark Matter
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0
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222
B Subatomic particles and dark matter
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6
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468
B B-Modes in CMB Polarization - any change since BICEP2 in 2015?
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6
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265
B Where did the first universe come from?
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2
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307
B Georges Lemaître primeval atom
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16
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2K
B Expansion of space affecting photon's energy
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11
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1K
B Mass of Space (B but approaching I)
2
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50
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1K
B One light year distance
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21
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696
B Long string theory
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5
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614
B Does Roger Penrose's Big Bang cyclic-universe thing make sense?
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5
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602
B Is there any kind of anti-matter "problem"?
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1
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499
B Why so many want, or are not disturbed by, a "deterministic" universe?
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10
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531
B Is the Universe really infinite?
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11
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943
B Why did the Big Bang happen?
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24
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988
B Why the expansion after the "Big Bang" is showed in cylindrical form?
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2
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642
B Size of universe - rewinding big bang versus "flat" universe
2
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54
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1K
B Age of the Universe
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21
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918
B Multiverse and Fictional Ideas
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5
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685
B Dark Energy, Dark Matter and the Speed of Light
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23
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752
B Does a contracting universe destroy its black holes?
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29
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906
B Matter-antimatter asymmetry - a simple explanation?
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8
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736
B Clarification on how old the Universe is
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11
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1K
B Can physical constants be different in other galaxies?
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26
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1K
B Light element abundances for He3/H?
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0
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635
B Gravitomagnetic explanation of Dark Matter
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7
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942
B Gas planets with solid satellites
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2
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724
B Expansion of Space Itself, rather than due to an Explosion like the Big Bang?
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9
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1K
B What is the recession speed today of the matter which created the CMBR?
2
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B Expansion of the Universe
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1K
B Expansion of space
3
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B Could the source of dark energy be our parent black hole feeding?
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6
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859
B Exploring the Possibilities: A Pre-13.8 Billion Year Old Galaxy
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4
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742
B Temporal differences across a galaxy?
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6
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654
B Big Bang Question -- How was the first matter formed?
2
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69
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3K
B How much energy does our Universe have?
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12
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928
B Explaining Cosmic Inflation using analogies
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3
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668
B How good are our ears? (Detectable Interstellar signals)
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7
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673
B What is the oldest of each class of star?
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2
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689
B Experimental evidence on cosmological redshift
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34
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2K
B What is Dark Matter or Energy?
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13
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1K
B For object 3.26 million light-years away, light redshifted by 70 km/s
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12
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704
B How could something that is infinite (the Universe) expand?
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30
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1K
B What does the Universe exapand into?
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27
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1K
B Basic confusion about the Big Bang and light cones
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11
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843
B Question regarding light from distant objects
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8
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901
B Does dark energy's effect or strength vary over time?
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24
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835
B Ways for the universe to die
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1
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568
B Size of the Big Bang
2
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58
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3K
B Does dark energy or cosmic inflation explain flatness?
2
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37
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2K
B How do the candidates for Dark Energy 'work'?
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4
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767
B Does the CMB itself tell us that it started at 3000K?
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23
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842
B What Space Does the Universe Occupy?
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4
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700
B Why doesn't cosmic inflation violate conservation of energy?
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3
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936
B Accelerating expansion of the Universe
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6
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1K
B Earth's orbit and the expansion of the Universe
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27
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1K
B What is the relationship between expansion and curvature?
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20
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1K
B Matter/Antimatter asymmetry
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27
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1K
B Inflation/Multiverse concepts
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1
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579
B Where is the center?
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6
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820
B Observers sending signals to measure expansion
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5
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618
B No way to catch up with galaxies currently receding at >c?
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5
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1K
B Is an infinite universe compatible with cyclic models?
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1
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842
B Confused About the Source of CMB Photons: Two Possibilities
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7
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1K
B Are there more theories about the start of our Universe?
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22
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1K
B Can we measure acceleration of galaxies and stars?
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1
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639
B Why does MOND fit rotation curves so exactly?
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14
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2K
B Traveling to alternate universes
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15
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B Please help in explaining 'we are not the center of the Universe'
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21
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1K
B Question on paper: Inflationary spacetimes are not past-complete
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16
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855
B Can particles interact without a mass?
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36
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B Exploring the Possibility of Expanding Atoms
3
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3K
B What is the Universe expanding into?
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5
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1K
B Spacetime: The cause of matter?
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2
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503
B Questions about dark matter, matter and elements
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7
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812
B Accelerating expansion
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3
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528
B What happens to time as space is expanding?
2
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68
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4K
B Cosmological constant for the Universe's expansion
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5
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1K
B Feasibility of multiple "big bangs"
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5
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617
B The Fate of the Universe -- Expansion or Collapse?
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5
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619
B Question about "our observed universe"
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15
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780
B 2D Model of the Universe as an expanding ball
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4
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714
B Gravitational fields affecting each other?
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21
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1K
B Request for an up to date list of cosmological theories
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11
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671
B A question about which Cosmology theories are mainstream and how?
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5
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694
B Early Universe Radiation: Gamma to Microwave?
2
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42
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B How can the Observable Universe be a closed system?
2
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37
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3K
B Will Cosmic web filaments eventually vanish?
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0
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470
B The Universe is now closed and curved?
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26
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3K
B Dark Matter Periodic Table?
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12
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1K
B Did the Big Bang expand faster than light?
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26
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2K
B Void to the End of our Universe?: Exploring the Unknown
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14
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1K
B The infinite and the infinitesimal
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10
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1K
B An interesting consequence of the closedness of the Cosmos
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13
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1K
B How can dark energy comprise 74% of the Universe?
2
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36
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2K

Cosmology

Welcome to the Cosmology forum!

Cosmology deals with the large-scale structure and geometry of the universe, its history, how it has evolved. It's overall particle and chemical make-up and how that has evolved. Its age.

Nowadays we have both theoretical and observational cosmology. One of the main reasons for putting up the Hubble Space Telescope was to accurately determine the expansion rate. And other cosmo parameters. Measuring a largescale parameter, like overall curvature or expansion rate would be observational cosmology.

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