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 Are black holes bound to galactic revolution?
- CowedbyWisdom
- · Replies 7 ·
Undergrad Can u'g'r'i'z' filters be converted to ugriz filters?
- CINA
- · Replies 2 ·
Undergrad What Does Unusual Auroral Activity Mean in Astronomy?
- CallMeSusan
- · Replies 3 ·
Graduate Question combining - black holes & conservation of angular momentum
- ruspj
- · Replies 5 ·
Undergrad Discover the Speed of Our Movement in Relation to the Center of the Universe
- wetwonder
- · Replies 10 ·
Graduate Colliding Black Holes & Einstein's Equations
- Yosty22
- · Replies 5 ·
Graduate Dark Energy Horizon: Light's Eternal Boundary?
- wolram
- · Replies 7 ·
Undergrad Looking for some help with gravitational lensing and dark matter
- jmandell
- · Replies 5 ·
High School Is the Earth-Moon System a Double Planet or Planet and Satellite?
- jbar18
- · Replies 5 ·
Graduate Conservation of mass - Stellar equation
- shounakbhatta
- · Replies 16 ·
High School Why do 1A Supernovas always explode at the same exact point?
- brucemitchell
- · Replies 5 ·
Graduate Blackhole temeperature and bigbang
- spidey
- · Replies 10 ·
High School Is the moon orbiting the earth at the same speed that earth spins?
- Erika E.
- · Replies 5 ·
Interstellar travel is impossible, moore's law is finite, the heat dea
- Denisovich
- · Replies 6 ·
Graduate Why do I never hear that the BB was caused by a collapsing black hole?
- Tzikin
- · Replies 11 ·
Undergrad If the universe is finite in size, what is at the end of it?
- Kutt
- · Replies 53 ·
Graduate Hydrostatic equilibrium of a cylindrical area
- shounakbhatta
- · Replies 8 ·
Graduate The Dark Flow & the Existence of Other Universes -New Claims of Har
- Tanelorn
- · Replies 28 ·
Undergrad Mars in Future: What's Ahead 1-3 Billion Years?
- willstaruss22
- · Replies 2 ·
Undergrad A 13.2Billion year old star just 186 Lyrs from earth
- Tanelorn
- · Replies 4 ·
Undergrad Brown Dwarf more massive than stars?
- Flatland
- · Replies 8 ·
Graduate Origin of Time: Theory of Big Bang Universe
- night_sky
- · Replies 44 ·
Graduate How have supernovae shaped the evolution of heavy elements in the Milky Way?
- sumi-e
- · Replies 2 ·
This is how Atlantic wire scientific columnists roll
- DHF
- · Replies 5 ·
High School Why wouldn't the Earth gravitate towards the Sun?
- Kyoma
- · Replies 19 ·
Graduate Can the universe be flat, yet finite?
- epovo
- · Replies 10 ·
Graduate State-space model of magnetically suspended ball
- rasco
- · Replies 10 ·
Undergrad Had an, oh, that's how moment - Slingshot manuever
- thecow99
- · Replies 3 ·
Graduate Why do we need the inflaton to expland space-time?
- fairy._.queen
- · Replies 4 ·
Graduate What is Dispersion Measure and How is it Used in Astrophysics?
- nenyan
- · Replies 7 ·
Graduate Re: artificial intelligence tied to universe construct?
- sgo2387
- · Replies 8 ·
Graduate Velocities in space relative to other objects
- schonovic
- · Replies 4 ·
Graduate Cosmic Slow Down: Is Dark Energy Variable?
- skydivephil
- · Replies 3 ·
Graduate Mass of the Universe: Dark Energy, Inflation & Observations
- HowardTheDuck
- · Replies 37 ·
Graduate Why isn't there Cosmic Visible Background Radiation from gamma rays?
- metsophi
- · Replies 10 ·
How can I contribute to the field of cosmology?
- Alektene
- · Replies 5 ·
Graduate Unification of Forces: Heating Up Spacetime & 4 Forces
- DiracPool
- · Replies 2 ·
Graduate Is the Big Bang Still Happening and Could It Lead to a Big Crunch?
- VernonNemitz
- · Replies 32 ·
Graduate Did Hubble opine that the universe was expanding?
- CCWilson
- · Replies 4 ·
Graduate Does the Acceleration of the Universe Change?
- falcon32
- · Replies 38 ·
Undergrad How many parsecs is it when the redshift z=1
- nenyan
- · Replies 4 ·
Undergrad Naive Understanding of Dark Matter and Dark Energy
- Niteo
- · Replies 3 ·
Undergrad How deep would you have to dig into Mars to reach Earth's gravity?
- Zaku2
- · Replies 16 ·
Graduate What are the unanswered questions in Cosmology?
- jimjohnson
- · Replies 11 ·
Graduate Is the New Lunar Mascon Model the Key to Understanding Moon's Gravity Anomalies?
- jim mcnamara
- · Replies 1 ·
Graduate Idea for cosmo Basics (minimum to understand meaning of expansion)
- marcus
- · Replies 36 ·
Graduate Balloon Analogy with different visualisation
- Ogr8bearded1
- · Replies 9 ·
Undergrad Thinking about going to school for Cosmology/Astonomy.
- mattblaster500
- · Replies 1 ·
High School Floating Objects Affected by the Moon
- CuriousGirl13
- · Replies 2 ·
Graduate Is the Universe Infinite in Time as Well as Size?
- ah12049
- · Replies 8 ·
Graduate Fermi energy approximation for white dwarfs
- Guffie
- · Replies 5 ·
Graduate Does Time Expand in All Directions in the Universe?
- Whitefire
- · Replies 70 ·
Graduate Astronomical Archives: Finding Distances to Stars
- Skyler0114
- · Replies 2 ·
Undergrad Will Light Travel Further in an Expanding Universe?
- johne1618
- · Replies 13 ·
Undergrad Rings & Tidal Locking: Formation Possibilities
- JohnSmith1980
- · Replies 1 ·
Graduate Aspiring Theoretical Physicist Seeks Grand Unified Theory Impact
- G.U.T.finder
- · Replies 7 ·
Undergrad Animating Solar System Evolution from Real Physics Data
- sina12345
- · Replies 8 ·
High School Need axial tilt info of earth daily
- axialhelp
- · Replies 5 ·
Graduate The idea behind a reverse shock
- Kidphysics
- · Replies 5 ·
Graduate Calculating the probability of a Boltzmann Brain
- lukesfn
- · Replies 2 ·
Graduate Earth-Moon Barycenter and Pro-Retrograde motions
- Lifepsy
- · Replies 5 ·
Graduate Will the Expansion of Space Prevent Overlapping Cosmic Horizons?
- Alektene
- · Replies 8 ·
High School Getting Started with DS9: A Beginner's Guide
- mateomy
- · Replies 1 ·
Undergrad After help understanding black drop effect
- aussieskywatch
- · Replies 2 ·
High School At which distance can you see Saturn's ring with a naked eye?
- Tiger Blood
- · Replies 14 ·
Graduate What can stellar kinematics tell us about the IMF?
- johnnnyboy92
- · Replies 1 ·
Graduate Universe geometry article development
- Mordred
- · Replies 13 ·
Undergrad Theory about the end and beginning of the universe.
- scienceislife
- · Replies 9 ·
Graduate Why not an equal amount of matter and antimatter in the universe?
- Mpcahn
- · Replies 15 ·
Graduate Cosmology questions, something that is puzzling me for days
- CarpathianLord
- · Replies 10 ·
Graduate Can Atmosphere exist in Moon Craters?
- Qshadow
- · Replies 4 ·
Undergrad Why do stars appear to have different colors?
- nicedazed
- · Replies 4 ·
Graduate Is It Possible to Destroy a Blackhole?
- Mordred
- · Replies 6 ·
Undergrad What to study to be an astronomer
- Kateenaclarke
- · Replies 2 ·
Graduate Could the Redshift of Light Challenge Our Understanding of the Big Bang?
- Hamish64
- · Replies 11 ·
Graduate Metaphysical description of the cosmos, help with theory?
- marshallmeyer1
- · Replies 4 ·
Graduate Matter in a super condensed state?
- sorrybadbeat
- · Replies 26 ·
Undergrad Universe is speeding up? Are we traveling with it? Dark Energy.
- PhaLynX
- · Replies 8 ·
Graduate Could the universe be a big ripple?
- Mpcahn
- · Replies 2 ·
Graduate Implications of a 2-Dimensional Universe
- kaikalii
- · Replies 6 ·
Graduate What gives a Black Hole its tremendous gravity?
- DHF
- · Replies 5 ·
High School What Caused the Bright Flash on the Moon on March 17, 2013?
- Astronuc
- · Replies 4 ·
Undergrad Debunking the Myth: Why Exposing to Vacuum of Space Won't Make You Explode
- mrquantum
- · Replies 7 ·
High School Static Universe vs Expanding Universe
- Grove1996
- · Replies 6 ·
Undergrad Will the Moon Ever Escape Tidal Locking?
- DHF
- · Replies 2 ·
Graduate Criteria for causal independence (new paper, Planck data)
- marcus
- · Replies 11 ·
Graduate Stellar formation / Expansion / Education questions
- TigerDaveJr
- · Replies 19 ·
High School Facts/Figures on Stars & Galaxies for Year 7 Class
- SUDOnym
- · Replies 8 ·
Graduate Is it possible that nature laws constants changed over time
- TeCNoYoTTa
- · Replies 4 ·
Graduate GALAXIES - what was 'extra' so visible matter was presumed missing?
- stephenn
- · Replies 9 ·
Graduate How would you teach quantitative cosmology? What examples to use?
- marcus
- · Replies 13 ·
Undergrad Is It Natural for the World to Have Zero Angular Momentum?
- mrblint
- · Replies 12 ·
Graduate Doppler shift, c, observation, recession, spacetime expansion
- Bojan Keevill
- · Replies 1 ·
Graduate Unraveling the Mystery of Dark Matter and Mass: Fact or Fiction?
- Philosopha
- · Replies 15 ·
Graduate A few questions about using power laws
- sfbsoccer25
- · Replies 3 ·
Graduate Is the Universe able to evolve due to fundamental forces?
- Lyre
- · Replies 2 ·
Undergrad Why are all the orbits elliptical and not circular?
- Monsterboy
- · Replies 6 ·
Graduate Why aren't black holes the brightest objects in the universe?
- DARKSYDE
- · Replies 15 ·
Graduate Initial Conditions of Astrophysical Simulations in 3D
- jwdozer327
- · Replies 4 ·