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 Compute the total stellar mass from a galaxy with Red Giants
- fab13
- · Replies 1 ·
Undergrad Colliding black holes: when will linear acceleration end?
- gneill
- · Replies 4 ·
Undergrad Restricted three body problem (numerical simulation of gravitational attraction)
- Silviu
- · Replies 3 ·
Undergrad Gravitational field in the galaxy and Schwarzschild´s time dilation
- Ennio
- · Replies 3 ·
High School Was the initial condition extremely cold?
- Atlas3
- · Replies 10 ·
Insights Calculating the Spin of Black Hole Sagittarius A* - Comments
- stevebd1
- · Replies 2 ·
Undergrad Matter density in Weinberg's Cosmology book
- jouvelot
- · Replies 5 ·
High School Is one side of the Earth faster at night and slower at daytime?
- shawnr
- · Replies 10 ·
High School Does galaxy formation conserve mass and angular momentum?
- fbs7
- · Replies 31 ·
Undergrad Is the inflationary universe a scientific theory?
- mitosis
- · Replies 3 ·
Undergrad Redshift Along Galactic Plane: Study & Research
- Ennio
- · Replies 5 ·
Undergrad A steady-state solution for the flow in the Boussineq approximation in a star
- fab13
- · Replies 1 ·
Stargazing Telescope recommendations for watching a galaxy?
- fbs7
- · Replies 17 ·
Undergrad A question about a popular example of expansion
- nomadreid
- · Replies 7 ·
High School Expanding Universe - Could It Be Rotating?
- zuz
- · Replies 7 ·
Stargazing Comet 46P/Wirtanen Visible to Naked Eye Dec 16
- jim mcnamara
- · Replies 2 ·
High School Dark matter is "normal" matter in black holes?
- Alfredo Tifi
- · Replies 7 ·
Undergrad Rotation profile for radiative zone of Sun - convection
- fab13
- · Replies 1 ·
Undergrad Is the increment of the expanding universe part of cosmology
- Hugh de Launay
- · Replies 6 ·
Undergrad What happens to a star's heat when it gets torn apart by a black hole?
- mitosis
- · Replies 11 ·
High School Does everything in space have or inherit inertia?
- DeckSmeck
- · Replies 33 ·
High School Can Black Holes Be Annihilated?
- Tree Universe
- · Replies 6 ·
Graduate Model of the Universe/Multiverse
- Tree Universe
- · Replies 5 ·
High School Discuss Dark Matter & Light: Photons Affecting Space-Time?
- Swedeson
- · Replies 3 ·
Undergrad Definition of 'dynamical equilibrium'?
- yahastu
- · Replies 7 ·
Undergrad Solar spectral intensity per wavelength - frequency
- Drugstore Cowboy
- · Replies 3 ·
Undergrad What was there before everything came to existence?
- Veer Vardhan Singh
- · Replies 39 ·
Undergrad How many galaxies do we have red shift data for?
- windy miller
- · Replies 15 ·
Undergrad Interpreting the Behavior of Galaxies in an Expanding Universe
- PhDnotForMe
- · Replies 8 ·
Stargazing What is the likelihood of another solar grand minimum occurring soon?
- davenn
- · Replies 16 ·
High School When light arrives at the end of space, what happens?
- Jinsuk Kim
- · Replies 49 ·
Undergrad Does Planet Mass Affect Orbital Period?
- Johnnyallen
- · Replies 5 ·
High School HSC dark matter survey...where is it?
- yahastu
- · Replies 1 ·
High School Is the energy of empty space concentrated differently in curved spacetime?
- Justin Hunt
- · Replies 12 ·
High School What is the Correct Formula for Calculating the Velocity of Saturn's Rings?
- nmsurobert
- · Replies 3 ·
High School Does the Path of an Interstellar Object Curve Due to Solar System Movements?
- DeckSmeck
- · Replies 18 ·
High School The Red Light Shift and Space Debris
- wlc88
- · Replies 5 ·
Undergrad What is the acceleration of the universe?
- DLeuPel
- · Replies 11 ·
High School How Does Time Dilation Vary Across the Galaxy?
- PhDnotForMe
- · Replies 4 ·
High School Expansion or Attraction: What's Driving Our Universe?
- Andy_K
- · Replies 24 ·
Undergrad How do we know age of the universe?
- yahastu
- · Replies 14 ·
High School Ratio of Earth-Sized exoplanets to other sizes of exoplanet?
- Cerenkov
- · Replies 7 ·
Graduate How are parameters in inflation models tuned to align with CMB constraints?
- Rafid Mahbub
- · Replies 1 ·
Graduate How much does peculiar velocity affect distance measurement?
- TomServo
- · Replies 2 ·
Undergrad Measuring the Effects of Dark Energy on Bound Objects: An Experimental Study
- DLeuPel
- · Replies 4 ·
Undergrad Were Population III stars powered entirely by p-p fusion?
- bbbl67
- · Replies 11 ·
High School What is the reasoning behind MOND's modification of gravity?
- PhDnotForMe
- · Replies 6 ·
Undergrad Solid diprotium saturated vapour density
- snorkack
- · Replies 6 ·
Stargazing Possibility of small bodies of liquid etc
- diegzumillo
- · Replies 13 ·
Graduate Is Dark Matter a Dead End in Physics?
- BillKet
- · Replies 82 ·
Undergrad How do we calculate galactic gravitation?
- PhDnotForMe
- · Replies 17 ·
High School No low-frequency emission from Fast Radio Bursts
- Imager
- · Replies 1 ·
Undergrad Liouville Theorem and the Expanding Universe
- Irishdoug
- · Replies 20 ·
High School Does dark matter interact with Baryons?
- wolram
- · Replies 4 ·
Undergrad A little doubt regarding specific angular momentum
- cptolemy
- · Replies 5 ·
Undergrad Force as a function of time/space
- fog37
- · Replies 12 ·
Undergrad Would complexity re-emerge if cosmic expansion reversed?
- Swamp Thing
- · Replies 5 ·
Graduate Do vacuum Ironing boards cause negative pressure in my Space
- tj00343
- · Replies 5 ·
High School IB Extended Essay in Astrophysics
- Victoria Petrov
- · Replies 4 ·
High School Barnard's Star, 6 Light-Years Away, May Have Cold SuperEarth
- CygnusX-1
- · Replies 8 ·
Graduate Artistic sense-ualisation of elementary origins of the Universe
- Cantor080
- · Replies 14 ·
Stargazing Southern hemisphere flickering orange/green star
- BilbobagginsINSPACE
- · Replies 4 ·
High School Parallel Spacetimes: Matter & Antimatter Separated?
- Chris W Kullander
- · Replies 5 ·
High School Is Dark Energy Causing the Universe's Expansion?
- Marcus1122
- · Replies 44 ·
Undergrad Hypatia, Elliptic orbits, conic sections
- JTC
- · Replies 6 ·
Undergrad Positive energy density of the universe
- Swamp Thing
- · Replies 1 ·
Undergrad List of modified gravity theories
- windy miller
- · Replies 2 ·
Graduate How to calculate Saturn's mass from Kepler's third law?
- sams
- · Replies 8 ·
Undergrad How much does the Universe accelerate?
- KurtLudwig
- · Replies 18 ·
High School Magnetospheric eternally collapsing objects
- tovisonnenberg
- · Replies 3 ·
Undergrad Merging Neutron Stars: What We Know So Far
- Vanadium 50
- · Replies 92 ·
Undergrad Calculating the Sun's core temperature?
- bbbl67
- · Replies 13 ·
High School Was the universe is infinitely large at the big bang?
- Green dwarf
- · Replies 11 ·
Undergrad What would happen if dark energy density decreased?
- KurtLudwig
- · Replies 6 ·
Graduate Accretion rate onto a WD over time (relation)
- physicschick21
- · Replies 6 ·
Undergrad Gaia parallaxes might reduce tension for Hubble constant
- mfb
- · Replies 14 ·
Graduate Numerical solution of the Mukhanov-Sasaki equation
- Rafid Mahbub
- · Replies 1 ·
Undergrad Why Is Jupiter's Surface Gravity Not as High as Expected?
- nmsurobert
- · Replies 10 ·
Undergrad Why limited discussion of only looking at history
- CONANGIB
- · Replies 4 ·
High School Why Doesn't Earth's Strong Gravity Crush Everything on Its Surface?
- nichos
- · Replies 14 ·
High School When a star exhausted it's nuclear fuel
- Marcus1122
- · Replies 20 ·
Undergrad Gravity and how it starts and stops
- Eric pelland
- · Replies 35 ·
Undergrad Ratio of Normal to Dark Matter: Unchanged Since Beginning?
- webb202
- · Replies 16 ·
High School What does it mean to say that "space" has a temperature?
- Graeme M
- · Replies 19 ·
Undergrad Core collapse of a supernova: the "void" left by the collapsed core?
- nikkkom
- · Replies 45 ·
Undergrad What areas of nano/optical research applies to astrophysics?
- astroman707
- · Replies 2 ·
High School Why Does Cosmic Growth End and Why Is Our Era Unique?
- wolram
- · Replies 2 ·
High School Is the cosmic expansion uniform everywhere?
- GTrax
- · Replies 15 ·
Undergrad Understanding Gunn-Peterson through the Reionization epoch
- fab13
- · Replies 11 ·
Undergrad Move the Earth Away from the Sun
- christian everett
- · Replies 17 ·
Undergrad What formulas would apply during a Big Crunch
- KurtLudwig
- · Replies 2 ·
Undergrad Redshift of Star Light: Proportionality to Distance & Other Theories
- msumm21
- · Replies 2 ·
Undergrad What is the Drift Rate of Jupiter's Great Red Spot?
- nmsurobert
- · Replies 1 ·
High School What is the correct way to calculate the speed of the Great Red Spot on Jupiter?
- nmsurobert
- · Replies 2 ·
Undergrad Correlation between a Star's Luminosity and Distance?
- fizixfan
- · Replies 10 ·
High School A Valid Position on Time Theory?
- Cerenkov
- · Replies 2 ·
High School Picture of the Day: Gas Swirling Around a Black Hole
- wolram
- · Replies 2 ·
Undergrad How to differentiate Doppler shift from star emission
- semc
- · Replies 5 ·
High School What is containing the Universe?
- Spin2win
- · Replies 63 ·
Undergrad Question on the Derivation of Temperature/Scale Factor Relation
- TRB8985
- · Replies 3 ·