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 Without degeneracy, when would Solar cores collapse?
- Ken G
- · Replies 109 ·
Stargazing Question about my photos of a Full Moon -- What is this point of light?
- Graham 1956
- · Replies 5 ·
High School Can BepiColombo Detect Microbial Life on Mercury?
- Astrodome123
- · Replies 2 ·
Undergrad Lines of stars that we see in the sky
- sophiecentaur
- · Replies 26 ·
Undergrad Einstein, Friedman and the cosmological constant
- Jaime Rudas
- · Replies 5 ·
Undergrad James Webb telescope calibration
- Mordred
- · Replies 16 ·
Graduate Largest Galaxy In An Infinite Universe
- Hornbein
- · Replies 12 ·
Undergrad Is the expansion of the universe affecting time or just space?
- exander
- · Replies 22 ·
Undergrad Mass measurement of galaxies with non-gravitational means
- Ranku
- · Replies 14 ·
Graduate Has anyone read this new paper on extending the BGV?
- Luis Mijares
- · Replies 2 ·
High School Beware of "truthiness" in astronomy in seemingly reliable websites
- Ken G
- · Replies 21 ·
Undergrad Which one is Antares in this photo?
- swampwiz
- · Replies 7 ·
High School History of Cosmology: 1915-1929 | Einstein, Hubble & GR
- Jimmy87
- · Replies 19 ·
Graduate Evolution of radio sources mimics a non-expanding universe
- member 673059
- · Replies 1 ·
Undergrad Distinguishing between the effects of dark matter and MOND
- Ranku
- · Replies 40 ·
Undergrad Release of trapped light during supernova
- jml53
- · Replies 8 ·
Undergrad New research puts age of the Universe at 26.7 billion years
- pinball1970
- · Replies 6 ·
High School The Sun's Influence on the Moon's Orbit: Is it Negligible?
- LesRhorer
- · Replies 4 ·
Undergrad I need some support, please, for a gravity assist analysis
- LesRhorer
- · Replies 86 ·
Undergrad Circular polarization and linear polarization of pulsars
- ZX.Liang
- · Replies 1 ·
Undergrad Spectral class temperature range
- snorkack
- · Replies 9 ·
Undergrad Velocity of a given planet relative to the Galactic Center
- Entropix
- · Replies 22 ·
Undergrad Is anything not spinning in the Universe?
- Tate
- · Replies 2 ·
High School Age of Universe: Big Bang, Braneworlds & Perspective
- KobiashiBooBoo
- · Replies 22 ·
High School The fastest spinning and possibly the youngest magnetar known
- lomidrevo
- · Replies 1 ·
Undergrad NANOGrav results on Thursday (June 29)
- mfb
- · Replies 8 ·
Undergrad What is theorized to be the coldest white dwarf in the Universe?
- swampwiz
- · Replies 27 ·
Undergrad Solar internet problems in 2025?
- bigvuth
- · Replies 2 ·
High School Cosmological time dilation of high-redshift quasars
- Cerenkov
- · Replies 8 ·
Stargazing Inquiry Regarding Hypothetical Faster-Than-Light Travel Scenario
- sushilreang
- · Replies 2 ·
Graduate Help with IPTA Gravitational Waveforms Detected
- Sware
- · Replies 6 ·
High School Expanding Universe -- What is it expanding into?
- jwaldo
- · Replies 20 ·
Undergrad Testing for dark energy using the Local Group
- member 673059
- · Replies 1 ·
Undergrad Oblate Ellipsoid: Can Earth Be Modified?
- Ben2
- · Replies 7 ·
Undergrad How to find Heliocentric latitude data for each planet?
- Mikael17
- · Replies 9 ·
Undergrad Thoughts on this article: The Universe Is More in Our Hands Than Ever Before
- swampwiz
- · Replies 9 ·
High School Questions about Supermassive stars in the Milky Way Galaxy
- BWV
- · Replies 6 ·
Undergrad Could it be that the Big Bang had no cause?
- donglepuss
- · Replies 3 ·
Undergrad Any evidence of white holes in the Universe?
- Slavik Komarova
- · Replies 15 ·
Undergrad Is there any way in the future to determine the Universe's size?
- Maximum7
- · Replies 58 ·
Undergrad How is there any pressure at all in isotropic radiation?
- phyTens
- · Replies 20 ·
Graduate Mass density of radiation in Friedmann equation?
- darkdark10
- · Replies 6 ·
High School Has Earth Lost Its Status as a Planet?
- DaveC426913
- · Replies 24 ·
Undergrad Star with quadrupole in a binary system violates Newton's 3rd Law?
- andromeda123
- · Replies 4 ·
High School What is a parsec and how is it measured?
- dnl117
- · Replies 7 ·
Undergrad Measuring the Velocities of Astronomical Objects in the Milky Way
- Al-Layth
- · Replies 11 ·
Undergrad What keeps dark matter in galactic halos?
- Dennis Plews
- · Replies 26 ·
High School Glimpsing Orion's Setting in the Western Sky
- neilparker62
- · Replies 8 ·
Undergrad Comet Bernardinelli-Bernstein enters inner solar system
- fresh_42
- · Replies 1 ·
Undergrad Early Catalog of Planet-Hosting Multiple Star (≥ 3) Systems
- Astronuc
- · Replies 3 ·
Undergrad Gravity inside an exponential mass disk
- independentphysics
- · Replies 16 ·
High School Is the Universe's age 13.7B years in a particular frame?
- Devin-M
- · Replies 19 ·
High School Saturn's 145 Moons: The Latest Discoveries and What Sets Them Apart
- Astronuc
- · Replies 16 ·
Undergrad What are the conditions under which stars can radiate coherent light?
- ZX.Liang
- · Replies 29 ·
Stargazing Asteroid filmed over the English Channel
- pinball1970
- · Replies 2 ·
Undergrad Developing Inflation Theory w/o Dark Energy: Alan Guth 1980
- Aromalsp
- · Replies 1 ·
High School When Would Planets Go Dark if the Sun Went Out?
- mopc
- · Replies 2 ·
High School What caused the recent supernova in the Pinwheel Galaxy?
- swampwiz
- · Replies 4 ·
Undergrad Discovering the Truth About Antares: From Young Red Supergiant to Blue Giant
- Thecla
- · Replies 5 ·
High School How can the Universe be flat? Ridiculous
- JackB123
- · Replies 13 ·
Undergrad Is Penrose's Cyclic Cosmology Model Only Applicable on a Local Scale?
- PAllen
- · Replies 5 ·
High School How does gravity's warping of spacetime appear first among the forces?
- syfry
- · Replies 1 ·
Undergrad Where can I find publicly accessible data from observatories in Europe?
- GucciPotlood
- · Replies 5 ·
High School At what distance would a Venus-like planet have a HZ temperature?
- xpell
- · Replies 14 ·
Undergrad The curvature and size of the Universe
- Jaime Rudas
- · Replies 36 ·
High School Night Sky of Alpha Centauri: Sol as a Bright Star
- swampwiz
- · Replies 15 ·
High School How bright is the Sun compared to the sky?
- LightningInAJar
- · Replies 17 ·
Graduate Updated Hubble constant from TRGB measurements
- member 673059
- · Replies 4 ·
High School What Would Happen to the Elements in the Human Body If Teleported to the Sun?
- ds442
- · Replies 3 ·
Graduate Is M_{Pl} the Planck mass or the reduced Planck mass?
- Alpha2021
- · Replies 5 ·
High School What's a good website for aurora forecasts?
- swampwiz
- · Replies 5 ·
Undergrad Was Electroweak Symmetry Breaking in the Early Universe Controversial?
- Hornbein
- · Replies 28 ·
Undergrad Topological phase transitions for the whole Universe...?
- Suekdccia
- · Replies 3 ·
Undergrad What Could Cause the Earth's Rotation to Dramatically Slow Down?
- garymc11
- · Replies 39 ·
High School Ken's Constellation Query: Viewing Same Constellation in AUS & SA
- Ken Osbourne
- · Replies 7 ·
High School Celestial objects in the very far future
- KingGambit
- · Replies 11 ·
Undergrad Calculating Proportional Luminosity of Fictitious Star
- Chem10
- · Replies 11 ·
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 Please express this theory of mine mathematically or through equations
- 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 Discover Jupiter's Mysteries with James Webb Space Telescope
- 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 Estimating Hot & Cold Spots in CMB Sky Maps
- Rene Kail
- · Replies 1 ·
Graduate Is there a way to convert distance modulus to get H(z) values
- fab13
- · Replies 3 ·
Undergrad Non-homogeneous and anisotropic metric and laws of physics...?
- Suekdccia
- · Replies 1 ·