Join in expert discussion on the topics of Astronomy, astrophysics and cosmology. This may include discussion on celestial objects, space, and the physical universe as a whole. Mainstream science only.
Threads
Undergrad Runaway supermassive black hole?
- timmdeeg
- · Replies 1 ·
Undergrad Is the light from Andromeda truly blue shifted?
- sol47739
- · Replies 33 ·
Stargazing Huge daytime fireball over Israel earlier today
- davenn
- · Replies 3 ·
Undergrad CMBR Evidence for Non-Baryonic Dark Matter
- Ranku
- · Replies 26 ·
High School Exoplanet TOI-4603 b, ~13x Jupiter mass, ~1.04 Jupiter diameter
- Astronuc
- · Replies 22 ·
Undergrad Models where all symmetries would be approximate?
- Suekdccia
- · Replies 1 ·
High School Images with CMB used to Illuminate Dark Matter
- .Scott
- · Replies 1 ·
High School Which statement is more accurate? (Hubble's redshift vs. Hubble's law)
- louislaolu
- · Replies 13 ·
Graduate Black hole mass coupled to expansion -- astrophysical source of dark energy?
- Bandersnatch
- · Replies 134 ·
Graduate Mathematical formulation of determinism from initial conditions
- Sumeru
- · Replies 3 ·
High School Ultramassive Black Hole (UMB), 30 billion solar masses?
- Astronuc
- · Replies 4 ·
High School Are the stars that we see in constellations within the Milky Way galaxy?
- FactChecker
- · Replies 31 ·
Graduate Scalar Field Dynamics in Inflation
- AHSAN MUJTABA
- · Replies 1 ·
Graduate New paper claims there is evidence of suppression of structure growth
- member 673059
- · Replies 2 ·
High School Circumgalactic Black hole imaged by the Hubble Space Telescope
- pinball1970
- · Replies 1 ·
High School AI Enhanced image of M87 black hole
- pinball1970
- · Replies 0 ·
Insights Planning to buy a first telescope? - Comments
- turbo
- · Replies 161 ·
High School James Webb Space Telescope observations of Jupiter
- neilparker62
- · Replies 15 ·
High School How many astronomers use JWST data?
- ohwilleke
- · Replies 1 ·
Undergrad Research on conservation of spacetime curvature
- Structure seeker
- · Replies 6 ·
Undergrad How many 1° hot and cold spots are in a full-sky CMB map?
- Rene Kail
- · Replies 1 ·
Graduate Is there a way to convert distance modulus to get H(z) values
- fab13
- · Replies 3 ·
Undergrad Can non-homogeneous anisotropic spacetimes break Lorentz invariance?
- Suekdccia
- · Replies 1 ·
High School Subatomic particles and dark matter
- dano718
- · Replies 6 ·
High School Vulpecula, pulsars and neutron stars
- Astronuc
- · Replies 10 ·
High School B-Modes in CMB Polarization - any change since BICEP2 in 2015?
- Cerenkov
- · Replies 6 ·
Graduate As stars contract, why does total entropy rise?
- Ken G
- · Replies 4 ·
Undergrad Do supernovae generate neutrinos or antineutrinos?
- swampwiz
- · Replies 50 ·
Undergrad Galaxy evolution in μ¨ based cosmologies
- ohwilleke
- · Replies 7 ·
Undergrad If GRB-221009A had been in Milky Way, would we have been fried?
- swampwiz
- · Replies 1 ·
Graduate What does the TE CMB spectrum reveal?
- Rene Kail
- · Replies 2 ·
Undergrad What Can We Learn About Stellar Nucleosynthesis at the NIC-XVII Symposium?
- Astronuc
- · Replies 0 ·
High School What made GRB221009A record-breaking?
- Astronuc
- · Replies 12 ·
High School Where did the first universe come from?
- BadgerBadger92
- · Replies 2 ·
Undergrad How to Independently Determine the Proportion of Dark Energy Density?
- Ranku
- · Replies 3 ·
Undergrad Should binned power spectrum signal replace multipole sum with bin centers?
- SherLOCKed
- · Replies 3 ·
Stargazing U.S. Solar Eclipse of Aug. 21, 2017
- Borg
- · Replies 414 ·
Undergrad Are there non-smooth metrics for spacetime (without singularities)?
- Suekdccia
- · Replies 3 ·
Undergrad Phase Contrast Telescope - Part II
- Quarker
- · Replies 25 ·
Undergrad Gravity does negative or positive work with cosmos redshift?
- doudou
- · Replies 7 ·
Stargazing Is Plutonium Found in Space Naturally?
- Andy DS
- · Replies 36 ·
High School Did Georges Lemaître Think the Universe Began from a Point?
- Helios
- · Replies 16 ·
Undergrad Approximate local flatness = Approximate local symmetries?
- Suekdccia
- · Replies 1 ·
Undergrad Angle of Sun by date and zip code?
- gary350
- · Replies 6 ·
Undergrad Oort Cloud and Kuiper Belt: differences
- sophiecentaur
- · Replies 3 ·
Undergrad Lorentz-violating solutions in cosmology with examples
- Suekdccia
- · Replies 2 ·
Undergrad When did the consensus on the maximum recession speed in cosmology change?
- epovo
- · Replies 7 ·
Undergrad Oort Cloud Dynamics: Interaction, Composition, Hazards
- happyhacker
- · Replies 3 ·
Undergrad How Long Does Water Ice Take to Sublimate in Space?
- Albertgauss
- · Replies 7 ·
Undergrad Can a scalar field model account for the cosmic redshift?
- Tertius
- · Replies 20 ·
Graduate N-Body Simulations of Chaos in the Orbits of Trappist System Planets
- charlesM
- · Replies 12 ·
High School Finding a universe map animation showing Earth and M87
- Flatwhite
- · Replies 5 ·
Undergrad Can inhomogeneities and topological defects break fundamental symmetries?
- Suekdccia
- · Replies 2 ·
High School 'Universe Breaking' results from JWST -- What does this mean?
- Cerenkov
- · Replies 36 ·
Graduate Interpreting SDSS extragalactic data in the era of JWST
- afmayer
- · Replies 1 ·
High School Deriving the Approach Velocity of Meteorites
- Jimmy87
- · Replies 6 ·
Undergrad Research on how many moons Earth could have
- emily-
- · Replies 15 ·
Undergrad Why don't hot stellar atmospheres show both emission and absorption spectra?
- Paul Howard A
- · Replies 4 ·
High School Forming Stars/ Brown Dwarfs by photo-erosion
- Florens
- · Replies 2 ·
High School Expansion of space affecting photon's energy
- stuart100
- · Replies 11 ·
Graduate Stephen Hawking's doctoral thesis is available online
- Borg
- · Replies 4 ·
Undergrad Estimating Mass of Central Object Using S2's Orbit Motion and Kepler's 3rd Law
- doopa
- · Replies 3 ·
Undergrad Density parameter and curvature index
- Ranku
- · Replies 5 ·
Undergrad What Milky Way stars could go supernova to < +3 at any time?
- swampwiz
- · Replies 3 ·
High School Why do early spiral galaxies in JWST images contradict galaxy formation models?
- Cerenkov
- · Replies 16 ·
Undergrad What does it mean that symmetries do not hold globally?
- Suekdccia
- · Replies 1 ·
Undergrad Massive galaxies during the early Universe, new JWST data
- gleem
- · Replies 1 ·
High School Can a T-tauri star degenerate into a Brown dwarf?
- Florens
- · Replies 20 ·
High School Formation of Brown Dwarfs in filaments?
- Florens
- · Replies 4 ·
Undergrad Is there a difference between an ultracool dwarf and a brown dwarf？
- ZX.Liang
- · Replies 5 ·
NASA confirms half-ton meteor crashed in South Texas
- Astronuc
- · Replies 18 ·
High School Who was the first person to recognize the stars as very distant suns?
- Thecla
- · Replies 12 ·
Graduate Does the invariable plane of the Solar system have axial precession?
- Hoon Sol
- · Replies 15 ·
Graduate Data on galaxy rotation curves vs visible matter
- bakerjay
- · Replies 3 ·
High School Mass of Space (B but approaching I)
- Thkaal
- · Replies 50 ·
Undergrad Could Dark Matter Be Stray Exoplanets or Collapsed Stars?
- GreenLemon
- · Replies 14 ·
Undergrad Expansion of the Universe and the cosmological principle
- member 673059
- · Replies 9 ·
High School What is the best source for this star data? (M44 Beehive Cluster)
- terado
- · Replies 11 ·
High School Hot white dwarfs and pre-white dwarfs discovered with SALT
- Astronuc
- · Replies 2 ·
Undergrad Microwave background radiation - temperature at recombination
- timmdeeg
- · Replies 3 ·
High School What is the “Unknown physics” of the new Kilonovae explosion?
- Maximum7
- · Replies 17 ·
Undergrad Some reasoning about Alfvén’s frozen-in flux theorem
- ZX.Liang
- · Replies 18 ·
High School Timekeeping and eclipses on a planet with four moons and two suns
- delie
- · Replies 45 ·
Stargazing The Happy Fall Day for Meteorites
- davenn
- · Replies 1 ·
Undergrad What is the basic definition and application of the virial theorem?
- Browntown
- · Replies 2 ·
Graduate Schwarzschild radius of the Universe
- Ivan Seeking
- · Replies 30 ·
Undergrad Cosmic Microwave Background Surveys
- Martyn Arthur
- · Replies 3 ·
High School Is There a Standard Definition for One Light Year Distance?
- KingGambit
- · Replies 21 ·
High School Planetary Orbits - Elliptical or Wavelike?
- Devin-M
- · Replies 10 ·
Graduate Black hole f(R) theory equation solution error
- Boy_saber
- · Replies 1 ·
Undergrad Electron-Positron Pair Instability Supernova
- debs1
- · Replies 3 ·
Graduate Why do merged black holes have similar spin around a=0.7?
- Vrbic
- · Replies 9 ·
High School The green comet is just a weak smudge now
- swampwiz
- · Replies 4 ·
High School How Do Gamma Ray Bursts Compare to Man-Made Plasma Emissions?
- braxton
- · Replies 6 ·
Undergrad What Causes the High Tide on the Antipodal Side of the Earth?
- KurtLudwig
- · Replies 7 ·
High School Are the stars of the constellations stationary?
- lighthouse1234
- · Replies 8 ·
Undergrad Understanding diagrams of the late stages of stellar evolution
- rnielsen25
- · Replies 1 ·
High School Question regarding supermassive black holes in the early Universe
- WIM_PHOTON
- · Replies 1 ·
High School Does the Nemesis star really exist?
- Jupiter60
- · Replies 6 ·
Undergrad Should I study astronomy first or cosmology first?
- Al-Layth
- · Replies 7 ·