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 Is Time Reversal Possible? New Research Challenges Long-Held Assumptions
- wolram
- · Replies 4 ·
Graduate Proper distance for co-moving bodies
- TheCanadian
- · Replies 4 ·
Graduate What are the basic mechanics of pulsar IGR J1104-6103?
- Bernie G
- · Replies 1 ·
Graduate Expansion of the universe and quantum perturbations
- tim9000
- · Replies 23 ·
Graduate Can Anyone Explain the Spin Foam Model in Simple Terms?
- Feeble Wonk
- · Replies 8 ·
Undergrad Does the mass of subatomic particles differ on different planets?
- ayush solanki
- · Replies 7 ·
Undergrad How did large star elements reach the Sun's primordial dust cloud?
- anorlunda
- · Replies 9 ·
Graduate Ending point for initial condition theories
- michaeljmj
- · Replies 2 ·
Graduate How to Transform Angular Velocity Vector of a Satellite from ECI to LVLH System?
- johnsnow
- · Replies 1 ·
Graduate Schwarzschild radius calculation
- verschrankung
- · Replies 4 ·
Graduate Can time dilation in different galactic zones prevent us perceiving aliens?
- graemecr
- · Replies 4 ·
Undergrad Ability to measure distances with parallax versus size
- Yosty22
- · Replies 4 ·
Graduate Gamma rays unlikely to originate from Dark Matter
- wolram
- · Replies 3 ·
Graduate Was the Einstein-Rosen bridge formed by a black hole and white hole?
- Francesco_C
- · Replies 2 ·
High School What color is the sky from space for an astronaut?
- Shivansh Mathur
- · Replies 6 ·
Graduate Understanding Virialized Dark Matter Halos in Galaxy Formation
- shadishacker
- · Replies 3 ·
Graduate Does this neutron star have an accretion disk?
- Bernie G
- · Replies 4 ·
Graduate Earth's precession rate from equatorial bulge torque
- bznm
- · Replies 5 ·
Graduate Wormhole Metric: Solving Difficult Differential Equations
- Francesco_C
- · Replies 1 ·
Graduate Did the universe gain energy after Planck time in the big bang model?
- big_bounce
- · Replies 14 ·
Graduate Can cosmic expansion slowdown explain redshift without dark energy?
- Bruce Wilson
- · Replies 3 ·
Insights Knut Lundmark and the Prehistory of Dark Matter - Comments
- Orodruin
- · Replies 15 ·
Graduate Can I Build My Own Deep Space Antenna Network for Receiving Planetary Probes?
- king yasin ally
- · Replies 6 ·
Graduate LaGrangian Points, L1,L2, L3 and L4
- Philosophaie
- · Replies 1 ·
Undergrad Range of Earth's year within habitable zone?
- Lapsangtea
- · Replies 14 ·
Insights LightCone7Combo Tutorial Part II - Charts - Comments
- Jorrie
- · Replies 3 ·
Graduate Brown dwarfs and close binary systems
- magic9mushroo
- · Replies 4 ·
Graduate Expanding space or contracting matter?
- sami_m
- · Replies 7 ·
Undergrad How often do satellites pass the moon?
- Mr. Fizzix
- · Replies 3 ·
Graduate How does the event horizon of a black hole form during the collapse of a star?
- anorlunda
- · Replies 6 ·
Graduate How Does Turbulence Restore the Poloidal Magnetic Field in Solar Reversals?
- astrolollo
- · Replies 9 ·
Undergrad Center of Mass of separating Orbiting Mass
- LydiaJ
- · Replies 2 ·
Graduate Is the Sun Positively Charged?
- Plok
- · Replies 5 ·
Undergrad How to calculate light intensity?
- R Sarwar
- · Replies 1 ·
Undergrad Why does the observable universe appear so large if it was tiny after the Big Bang?
- scopehead
- · Replies 13 ·
High School What does the Milky Way orbit if galaxies are all moving apart?
- Stephanus
- · Replies 5 ·
Undergrad How does the expansion of the universe work?
- EdColider
- · Replies 112 ·
Graduate Gaussian vs. non-Gaussian fluctuations
- Einj
- · Replies 5 ·
Graduate How does the CMBR require dark matter?
- alw34
- · Replies 6 ·
Graduate What are Black Hole Singularities: Physical or Mathematical?
- wolram
- · Replies 2 ·
Graduate Oribit integrator for a logarithmic potential
- Serna
- · Replies 3 ·
High School Finding exoplanets with Kepler data on Planet Hunters
- AngularMomentum
- · Replies 2 ·
Graduate Inflationary misconceptions and the basics of cosmological horizons
- bapowell
- · Replies 45 ·
Graduate Are black holes more redshifted than the CMB?
- Gerinski
- · Replies 10 ·
Undergrad Could 0.9c neutron star jets originate from the core?
- Bernie G
- · Replies 7 ·
High School "Gravitational Compression in Neutron Stars"
- billj
- · Replies 56 ·
Graduate Is space an entity, a relationship or a concetual framework?
- AndyFin
- · Replies 40 ·
High School What Is the Evidence for Dark Matter and Dark Energy?
- wolram
- · Replies 19 ·
Graduate Does the event horizon change as large objects approach it?
- newjerseyrunner
- · Replies 9 ·
Graduate Does this dynamic model complement the Balloon Analogy?
- alw34
- · Replies 4 ·
High School How Do Orbits Work?
- Fez98
- · Replies 11 ·
High School Zig Zag Star Movement in Singapore 2011
- Faisal Shaukat
- · Replies 24 ·
Graduate What constitutes negative and positive energy
- DiracPool
- · Replies 21 ·
Undergrad Aerostat on Venus vs Surface Colony on Mars
- Algren
- · Replies 11 ·
Graduate Stellar-mass black hole formation sequence
- sevenperforce
- · Replies 30 ·
Graduate X-ray bursts might not happen for larger neutron stars?
- Jonathan Scott
- · Replies 54 ·
Graduate Astronomical source extraction in non uniform background
- sonutabitha
- · Replies 2 ·
Undergrad Question Concerning the Rate of Expansion
- quantumphysics11
- · Replies 7 ·
Undergrad Has Gravitational radiation been found
- wolram
- · Replies 3 ·
Graduate How massive would an impactor need to be to destabilize the sun?
- DET
- · Replies 14 ·
Graduate A possible super-Earth or Brown Dwarf in our Solar System
- |Glitch|
- · Replies 12 ·
Graduate Could Planet 9 have caused the gap between the heliopause and the Oort cloud?
- Blayde Keel
- · Replies 4 ·
Undergrad Space Travel Physics: Realistic 2D Simulation
- Noah J
- · Replies 1 ·
Graduate The probable trajectory of the ninth planet in night sky?
- sami_m
- · Replies 3 ·
Undergrad How would a spaceship travel at light speed reach a destination safely?
- Brunolem33
- · Replies 8 ·
Graduate Dark Energy in Relation to Spacetime
- physicsquestion11
- · Replies 12 ·
Graduate Did Black Holes appear in the first billion years?
- wolram
- · Replies 4 ·
Graduate Space-Time Distortion and Warp-Drive
- srs101
- · Replies 8 ·
Graduate How Does Normalization in LightCone7zeit Enhance Cosmological Graph Comparisons?
- Jorrie
- · Replies 8 ·
Insights LightCone7Combo Tutorial Part I - Comments
- Jorrie
- · Replies 2 ·
Graduate Supermassive black hole evolution
- Chronos
- · Replies 1 ·
Undergrad Calculating Relative Brightness of Type Ia Supernovae
- shadishacker
- · Replies 5 ·
Graduate What is the cause of variations in lunar eccentricity?
- fizzy
- · Replies 28 ·
Graduate Time evolution of density profile
- throneoo
- · Replies 1 ·
Undergrad Two stars with the same mass equals the same luminosity?
- JoAstro
- · Replies 7 ·
Graduate Can an external observer see their reflection in a mirror falling toward a black hole?
- rjbeery
- · Replies 5 ·
Graduate Speed of light from BB to present day
- Tanelorn
- · Replies 20 ·
Graduate Loss of stellar information in a black hole
- airydisc2004
- · Replies 8 ·
Graduate Speed of light/electromagnetic waves is constant?
- Yash1993
- · Replies 6 ·
Graduate Could dark matter effects be spatial distortions rather than matter?
- meBigGuy
- · Replies 20 ·
Graduate Possible Intermediate-Mass Black Hole in Milky Way Galaxy
- |Glitch|
- · Replies 1 ·
Graduate Sigma_8 and n_s Cosmological Parameters
- SteveDC
- · Replies 2 ·
Graduate Why do phase-space points representing microstates follow trajectories?
- Harry Mason
- · Replies 1 ·
Undergrad What Are the Unique Properties of a Black Dwarf?
- dendros
- · Replies 5 ·
Insights Can We Tell Whether the Universe Is Rotating? - Comments
- Multiple_Authors
- · Replies 3 ·
High School Can you tell the Physical Properties of a Messier Object?
- Atominate
- · Replies 3 ·
Graduate Question regarding Friedmann equation
- Buzz Bloom
- · Replies 9 ·
Graduate The Simpson-Hawking Donut Universe
- klotza
- · Replies 1 ·
High School Can a Black hole also be a wormhole?
- Sangam Swadik
- · Replies 23 ·
High School Can Cosmology Be Experimentally Verified?
- wolram
- · Replies 3 ·
Graduate Black hole singularty definable In 3D space?
- nospoon2016
- · Replies 4 ·
Undergrad Venus' Synodic Year: Why Does It Take Longer Than Earth's?
- sivaswetha
- · Replies 5 ·
Graduate Is There Evidence for Redshift Drift in High-z Galaxies?
- ConformalGrpOp
- · Replies 1 ·
Undergrad Why don't atoms expand if space itself is expanding?
- apurvmj
- · Replies 2 ·
Undergrad How fast was the expansion during the big bang?
- Javaxcore
- · Replies 35 ·
Stargazing How to calculate the amount of light a telescope collects?
- JoAstro
- · Replies 1 ·
Graduate Best Place to View Stars: North Pole
- Brian T
- · Replies 4 ·
Graduate Loop quantum cosmology vs string cosmology
- kodama
- · Replies 7 ·
Graduate Questions about the topology of the universe
- dougy
- · Replies 3 ·
Graduate How long would it take two planets to collide?
- rohanlol7
- · Replies 14 ·