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
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 ·
High School Why do people not notice the equinox when it happens?
- Baluncore
- · Replies 20 ·
Undergrad Do supernovae generate neutrinos or antineutrinos?
- swampwiz
- · Replies 50 ·
Undergrad How Does μ¨ Based Cosmology Impact Our Understanding of Galaxy Evolution?
- 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 is the significance of the record-breaking Gamma-Ray Burst GRB221009A?
- 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 Maximizing S/N in Angular Power Spectrum Signals
- 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 Solutions that break the Lorentz invariance...?
- 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 Map of M87 Galaxy & Universe: Find & Explore Here!
- Flatwhite
- · Replies 5 ·
Undergrad Inhomogeneities and topological defects in cosmology...
- 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 paper and sources investigating Earth's moons
- emily-
- · Replies 15 ·
Undergrad Do Emission and Absorption Spectra Match? A Non-Physics Minded Tourist's Guide
- 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 is this JWST paper a cause for 'Panic'?
- 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, MNRAS
- 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 How Can Planetary Movements Affect Time and Illumination on an Inhabited Planet?
- 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 Please help solve the equation in black hole f(R) theories
- Boy_saber
- · Replies 1 ·
Undergrad Electron-Positron Pair Instability Supernova
- debs1
- · Replies 3 ·
Graduate Black holes: merged remnants have similar spin - why?
- 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 Lost Companions: Investigating the Existence of the Nemesis Star
- Jupiter60
- · Replies 6 ·
Undergrad Should I study astronomy first or cosmology first?
- Al-Layth
- · Replies 7 ·
Undergrad What is the difference between collisionless and self-interacting dark matter?
- Ranku
- · Replies 1 ·
High School Is Your Rock a Real Meteorite or a Common Meteorwrong?
- Patel het
- · Replies 9 ·
Undergrad Question on the horizon problem
- Nikolai01
- · Replies 17 ·
Undergrad What is the probability of life on exopanet LHS475b?
- NOSYLA
- · Replies 15 ·
High School Long String Theory: Unveiling the Universe's Secrets
- Conn_coord
- · Replies 5 ·
Undergrad Expansion-Collapse cycle in cosmological structures?
- Suekdccia
- · Replies 1 ·
Undergrad Local dark matter distribution
- Frabjous
- · Replies 14 ·
Graduate Has the merger of a neutron star and an anti-neutron star been modeled?
- Cato
- · Replies 4 ·
Graduate Does the gravitational rate of acceleration increase within a planet?
- sjbauer1215
- · Replies 54 ·
High School Does Ceres ever transit Jupiter?
- zuz
- · Replies 1 ·
Undergrad Lunar Slingshot Maglev: NASA's Energy Savings for Mars & Beyond
- darkdave3000
- · Replies 9 ·
Undergrad Comet Sublimation: Why Does Halley's Comet Still Exist?
- hexanol
- · Replies 6 ·
Undergrad Can Electromagnets Propel Starship Orion Using Nuclear Explosions?
- darkdave3000
- · Replies 17 ·
High School Data needed - Related bodies and their stats
- ForTheLoveOfPhysics
- · Replies 5 ·
Undergrad Successful predictions from anthropics? (History of science question)
- windy miller
- · Replies 11 ·
High School Projected linear separation between companion stars
- guv
- · Replies 14 ·
Undergrad Is it possible to unbind a neutron star?
- Cato
- · Replies 2 ·
Stargazing Can Stars Be Spaghettified in a Matter of Days by Black Holes?
- Gear300
- · Replies 17 ·
Undergrad How much better is HabEx going to be relative to Webb?
- swampwiz
- · Replies 4 ·
Undergrad Measuring the rotation curve of galaxies
- accdd
- · Replies 1 ·
High School Does Roger Penrose's Big Bang cyclic-universe thing make sense?
- HomesliceMMA
- · Replies 5 ·
High School Is there any kind of anti-matter "problem"?
- HomesliceMMA
- · Replies 1 ·