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
Graduate Looking for information about spectroscopy isotopes and stellar formation
- Teraformer
- · Replies 1 ·
High School Do Fictional Worlds Exist in the Multiverse?
- R0dr1go
- · Replies 8 ·
High School Questions about a paper on reconciling JWST and HST data
- Cerenkov
- · Replies 4 ·
Undergrad How we are in a matter dominated universe (without antimatter annihilation)
- brooknorton1
- · Replies 13 ·
Undergrad J0524-0336: metal-poor red giant with extreme lithium enhancement
- Astronuc
- · Replies 2 ·
Undergrad Can there be free electrons in interstellar gas?
- Suekdccia
- · Replies 7 ·
Graduate Does modified gravity somehow explain galaxies that don't need it?
- user-000
- · Replies 3 ·
Undergrad Regarding the accuracy of the description of a pulsar in a 1977 paper
- tade
- · Replies 5 ·
Undergrad Wow! signal could be from interstellar hydrogen clouds
- mfb
- · Replies 2 ·
Undergrad Comet A117uUD Goes Interstellar after Encountering Saturn in 2022
- Astronuc
- · Replies 1 ·
Undergrad Toward the spectral index in slow roll
- ergospherical
- · Replies 1 ·
Undergrad Density fluctuations in a homogeneous linearly expanding universe?
- Suekdccia
- · Replies 7 ·
High School Will we ever communicate with extraterrestial life in a reasonable time frame?
- KurtLudwig
- · Replies 148 ·
Undergrad What is the reason for density perturbations in the CMB?
- timmdeeg
- · Replies 1 ·
High School Zig-zagging lights over northeast England, fast and non-twinkling
- All year camper
- · Replies 5 ·
Undergrad Question on halos of matter made from massive and stable particles?
- Suekdccia
- · Replies 53 ·
High School Temperature difference between Venus and Mercury
- Agent Smith
- · Replies 15 ·
High School Asteroid Dimorphous easier to move because it's made up of rubble?
- DaveC426913
- · Replies 17 ·
Graduate N-Body inputs from Keplerian Orbits
- Shivi20
- · Replies 6 ·
Graduate Efficient cone searches with Healpix-alchemy
- BOAS
- · Replies 0 ·
Graduate Celestial objects - older than the CMB
- Phantom-objects
- · Replies 7 ·
High School Matter/Anti-Matter in a Vacuum
- keeney123
- · Replies 6 ·
Undergrad What Factors Create the Windiest Exoplanets?
- Tazerfish
- · Replies 8 ·
High School Big Bang as the Collapse of a Wave Function
- f00gass
- · Replies 3 ·
Undergrad Any Galaxy (Milky-way) based coordinate systems?
- vsrawat
- · Replies 8 ·
High School Expected Earth-relative velocity of interstellar particles
- Grinkle
- · Replies 7 ·
High School Interstellar navigation to Proxima B with an unmanned probe
- BWV
- · Replies 28 ·
Undergrad Galaxy collision separates dark matter from regular matter
- DaveC426913
- · Replies 2 ·
Stargazing Any Heliocentric planetrorium software or site?
- vsrawat
- · Replies 2 ·
Stargazing Some photos of Antares and Sigma Sagittarii (Nunki)
- PhysicsEnjoyer31415
- · Replies 3 ·
Undergrad Shell structure topological defects as substitute for dark matter
- Ranku
- · Replies 3 ·
Graduate HST measures Draco dwarf galaxy over 18 years in DM study
- pinball1970
- · Replies 1 ·
Undergrad Orbital periods in binary and trinary star systems
- Exy
- · Replies 6 ·
Graduate Trying to plot a graph of energy densities for radiation and PBHs
- di_a_tonic17
- · Replies 2 ·
Undergrad Very bright geo satellite in my night sky?
- avicenna
- · Replies 36 ·
Undergrad Diameter of the observable Universe
- Thecla
- · Replies 13 ·
Undergrad What is the Possibility of Habitable Planets Around Brown Dwarfs?
- DiamondTiara
- · Replies 6 ·
Undergrad Why can't we photograph magnetic lines of force emitted by planetary and beyond objects (like we can for the Sun)?
- DenniSys
- · Replies 15 ·
Undergrad Is Baryogenesis a Convincing Hypothesis?
- Morgo
- · Replies 3 ·
Undergrad Could cosmic rays induce a vacuum decay in the future?
- Suekdccia
- · Replies 5 ·
Undergrad Early Universe massive Black Holes question
- ShadowKraz
- · Replies 10 ·
High School Questions about dark matter/energy
- imsmooth
- · Replies 50 ·
Undergrad Galaxies as systems extended from the solar system
- Martyn Arthur
- · Replies 4 ·
Graduate Is the Jeffry Scale/Bayes Factor Still Used for Testing Inflationary Models?
- Mordred
- · Replies 0 ·
High School Approximately how long does it take for a galaxy to form?
- Tanelorn
- · Replies 12 ·
High School Why is the CNO Cycle considered catalytic in stellar nucleosynthesis?
- DrLich
- · Replies 2 ·
High School Is the Universe older than we think?
- TheOrionNebula
- · Replies 40 ·
High School Discussion on the source or cause of Dark Energy Dark Matter et al
- Tanelorn
- · Replies 6 ·
Undergrad Does Organic Matter Experience Gravity on the Moon?
- samcan
- · Replies 15 ·
High School Is the Sun's Magnetic Field About to Flip?
- DaveC426913
- · Replies 1 ·
High School Why is silicon-burning exothermic beyond iron?
- DrLich
- · Replies 4 ·
Stargazing How Can You Capture Stunning Moon Photos with a Remote Control?
- PhysicsEnjoyer31415
- · Replies 9 ·
High School A question regarding Heliocentric Latitude
- Mikael17
- · Replies 1 ·
Graduate Very last pulse from a neutron star
- CGHW01
- · Replies 2 ·
Graduate Should luminosity distance be 0 at z=0?
- johnio09
- · Replies 4 ·
Graduate Horndeski theory: zero denominator in metric derivative chain rule
- fab13
- · Replies 16 ·
High School Dark Energy: Are We All Missing The Obvious?
- despoi1er
- · Replies 4 ·
Undergrad Unknown Radio Signal from Space Repeats Every Hour -- Usually
- Tom.G
- · Replies 6 ·
Undergrad How did the universe expand from a finite singularity to infinity?
- outremer
- · Replies 13 ·
Undergrad Hydrogen line observation frequency range and space Hydrogen speed?
- Jaaanosik
- · Replies 33 ·
High School Asteroid 2024 BX1 entered Earth's atmosphere over Germany 21 Jan 2024
- Astronuc
- · Replies 1 ·
Stargazing What can I see with 10x50 binoculars in Bortle class 4?
- AryaanHegde
- · Replies 4 ·
Undergrad What temperature would 1 keV neutrinos have today?
- ergospherical
- · Replies 14 ·
Undergrad Energy conservation in Friedmann equations and expanding spacetime
- timmdeeg
- · Replies 17 ·
Undergrad Retro/prograde flyby galaxies and their bar formation
- milkism
- · Replies 1 ·
High School Are some objects in the night sky just older images of other objects?
- hjgfx697
- · Replies 12 ·
Undergrad Questions about paper "How closed is cosmology"
- KleinMoretti
- · Replies 18 ·
High School Why does neon-20 fuse to oxygen-16 and magnesium-24 instead of calcium-40?
- DrLich
- · Replies 2 ·
Undergrad Why do stars at galaxy edges orbit faster than Newtonian physics predicts?
- tedj121
- · Replies 8 ·
Undergrad Observational Astronomy Project Ideas to Show Special Relativity
- Sciencemaster
- · Replies 26 ·
Undergrad Brian Cox and the end of the Universe?
- KDP
- · Replies 13 ·
Stargazing My photo of Jupiter (I think)
- PhysicsEnjoyer31415
- · Replies 4 ·
Undergrad Latest Findings from DESI Collaboration
- MrRobotoToo
- · Replies 2 ·
Undergrad Matter power spectrum scalings from the Mészáros equation
- ergospherical
- · Replies 1 ·
High School Does matter accelerate indefinitely in a vacuum and could this explain cosmic expansion?
- zuz
- · Replies 4 ·
Undergrad Speed of light on cosmological scales
- Grinkle
- · Replies 9 ·
Undergrad Cosmological Scalar Field Density Dilution
- Samama Fahim
- · Replies 3 ·
Graduate Matter density crude estimates
- Floyd_13
- · Replies 2 ·
Stargazing Dark matter and its effect on the orbit of stars
- petercl14
- · Replies 13 ·
High School Percentage of known energy in the Universe
- mister i
- · Replies 9 ·
Stargazing Documenting the setup of my new telescope
- collinsmark
- · Replies 54 ·
Undergrad Deriving the Roche limit(d) for body of mass M and satellite m
- PhysicsEnjoyer31415
- · Replies 4 ·
Undergrad Questions about Black Holes, Hawking Radiation, and Dark Matter
- ShadowKraz
- · Replies 11 ·
High School Pressure on creation of the Universe
- joshcitylife
- · Replies 7 ·
High School Can the "creation" of space in the Universe affect the speed of light?
- mister i
- · Replies 7 ·
Undergrad Can time on elliptical orbit be expressed analytically?
- snorkack
- · Replies 6 ·
Undergrad Global properties of the universe
- south
- · Replies 10 ·
Undergrad Can there be structures made from neutrinos with angular momentum?
- Suekdccia
- · Replies 18 ·
Undergrad Do Cosmological Models Influence Quantum Field Theory?
- KleinMoretti
- · Replies 10 ·
High School History of CMB, prediction of 1 in 100,000?
- windy miller
- · Replies 4 ·
Undergrad Light curving around vortex simulating a black hole
- addddb
- · Replies 5 ·
High School U.S. solar eclipses Oct. 14, 2023 (annular) and Apr. 8, 2024 (total)
- Borg
- · Replies 68 ·
High School Expansion of the Universe
- petercl14
- · Replies 9 ·
Undergrad Determining stellar mass independent of its gravity
- Ranku
- · Replies 3 ·
Undergrad Post Big Bang Gravity
- Hyku
- · Replies 11 ·
Graduate Why Do Novas Emit Visible Light Despite Nuclear Reactions Producing Gamma Rays?
- Brzohn
- · Replies 2 ·
High School NASA names asteroid "Hossi" after Sabine Hossenfelder
- Swamp Thing
- · Replies 3 ·
Undergrad Why on Earth do we not see older stars close to us?
- Martyn Arthur
- · Replies 3 ·
High School Solar Wind Particles, - reaching into Earth's magnetic field?
- Mikael17
- · Replies 1 ·
High School Big Crunch in an infinite, symmetrical, Newtonian universe?
- Pony
- · Replies 10 ·