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 FRW pertubations in overdense and underdense regions
- center o bass
- · Replies 1 ·
Undergrad Would the sky be red if the atmosphere was thicker?
- willstaruss22
- · Replies 9 ·
Graduate Non equilibrium boson distribution function
- center o bass
- · Replies 1 ·
Graduate If the sun becomes a black hole will its schwarzschild radius change?
- avito009
- · Replies 2 ·
Undergrad What is the significance of the foci in gravitational orbits?
- MattWakes
- · Replies 2 ·
Undergrad Which Has A Stronger Gravitational Pull - A Black Hole or Neutron Star?
- Uberhulk
- · Replies 5 ·
High School I saw the 23 Oct 2014 N America partial solar eclipse
- lpetrich
- · Replies 2 ·
Graduate Why two terms "Dark Energy" and "Dark Matter"
- atuldpatil
- · Replies 2 ·
"Churning galaxy boasts a fiery halo of baby stars"
- Spinnor
- · Replies 1 ·
Graduate Photon's History: Quantum Expression for Energy Loss with Scale Factor Increase
- anorlunda
- · Replies 9 ·
High School Trying to understand the universe .possible at 13 years old?
- canutej
- · Replies 12 ·
Graduate White dwarf mass-radius relationship
- MattWakes
- · Replies 7 ·
High School Boundaries between the Constellations
- Philosophaie
- · Replies 2 ·
Graduate Can black holes hold the key to the origin of our universe?
- wolram
- · Replies 1 ·
Graduate Origin of our universe 4D black hole
- StonedPhysicist
- · Replies 33 ·
Undergrad Were all galaxies quasars when they were young?
- Robin
- · Replies 2 ·
Graduate Dark matter possibly explained by axions?
- Tanelorn
- · Replies 19 ·
High School Moon Phases: Rise & Set Timings & Direction Explained
- ajay.05
- · Replies 3 ·
Undergrad I require help with understanding beginner astronomy questions.
- SigmaOctans
- · Replies 4 ·
Graduate How is the Rotational Velocity of Galaxies Measured?
- ChrisVer
- · Replies 3 ·
Graduate Why do large elliptical galaxies not collapse due to their gravity?
- Tanelorn
- · Replies 8 ·
Undergrad Is Infinite Space the Key to Understanding the Big Bang?
- DHooley
- · Replies 16 ·
Graduate Does cosmic time (or comoving clock) run at the same pace at all times?
- Vincentius
- · Replies 23 ·
Undergrad How Stars Ignite - The Fusion Reaction
- avito009
- · Replies 13 ·
Graduate Are High Z SNe Brighter than LCMD Predicts?
- RCopernicus
- · Replies 1 ·
Graduate Current Research on Communication Between Universes?
- Mandy mae
- · Replies 8 ·
Undergrad Determine the least value of declination of stars so that stars can be seen?
- nicolauslamsiu
- · Replies 3 ·
Graduate Can a Balloon Float Inside a Hollow, Air-Filled Space Elevator?
- udtsith
- · Replies 4 ·
Graduate Why do black holes vanish over time?
- NTW
- · Replies 16 ·
Undergrad What's the scale on Mars rover "Microscopic Imager" images ?
- B0b-A
- · Replies 2 ·
Graduate Measuring Cosmic Rays: There's an App for that
- TumblingDice
- · Replies 1 ·
High School Uranus' closest approach to earth and its interval
- BOAS
- · Replies 4 ·
Graduate What exactly is the Hubble parameter?
- 21joanna12
- · Replies 7 ·
Undergrad Kepler's 3rd Law: Solving Questions & Math
- mh8780
- · Replies 3 ·
Graduate Dark Matter does not exist, what do you think?
- wolram
- · Replies 59 ·
Graduate Lagrange Point and orbital velocity
- _Stew_
- · Replies 2 ·
What would you do if you were in space
- Mitxigan
- · Replies 1 ·
Undergrad What Are the Mysteries of the Universe We Still Need to Understand?
- CKaiser1985
- · Replies 9 ·
Unraveling the Expansion of Our Universe: Seeking Answers | Nautical Thoughts
- ocset
- · Replies 3 ·
Graduate Is the universe NOT accelerating ?
- fencewalker
- · Replies 5 ·
Graduate Proof that black holes do not destroy information
- Ipquarx
- · Replies 2 ·
High School Solar Cycle: Current State & Update
- !Jon Snow!
- · Replies 5 ·
Undergrad How can I determine right ascension and declination of a star in the sky?
- r m williams
- · Replies 4 ·
Total Lunar Eclipse 8th Oct 2014
- davenn
- · Replies 23 ·
Graduate What is the true purpose of inflation in the early universe?
- CKH
- · Replies 41 ·
Stargazing Is a Geo Stationary Satellite the Key to Building the World's Biggest Telescope?
- gaurav0751
- · Replies 10 ·
Graduate What is the Visible Mass of the Milky Way?
- RCopernicus
- · Replies 4 ·
Graduate Galaxy Formation: Searching for Primordial Origins
- wolram
- · Replies 29 ·
Graduate Inertia in Space: Opening a Hatch
- Prof Null
- · Replies 13 ·
Graduate ULXs & Black Holes: Unveiling Secrets of Escape Velocity
- Dryson
- · Replies 6 ·
Graduate Is Dark Matter Only Interacting Through Gravity or Are There Other Theories?
- Ciro Spaciari
- · Replies 19 ·
Graduate Can There Be Time Without Space? A Question for Discussion
- iDimension
- · Replies 3 ·
Graduate Calculating Exoplanet Habitability using Stefan-Boltzmann Law | Habitable Zones
- |Glitch|
- · Replies 15 ·
Graduate Why does light travel radially in the FRW universe?
- center o bass
- · Replies 5 ·
Graduate Is there an unseen part of the universe older than the known universe?
- cjackson
- · Replies 3 ·
Graduate Big Bang, big rip, lQc, has anyone ever run a computer simulation?
- yoda-morpheus
- · Replies 5 ·
Undergrad Introdutions to mathematical astronomy?
- moriheru
- · Replies 1 ·
Undergrad Reynolds Number and Turbulence in Atmospheric Boundary Layers
- Martina835
- · Replies 4 ·
Graduate Could the Big Bang be related to the flow of current in vacuum tubes?
- Dryson
- · Replies 7 ·
Graduate Why does inflation generate gravity waves?
- thecommexokid
- · Replies 5 ·
Graduate Was the CMB Radiation Predicted or Post-Dicted by Big Bang Cosmology?
- AdkinsJr
- · Replies 28 ·
Undergrad Does the observable universe support the idea of circular math?
- Physics_Kid
- · Replies 7 ·
Graduate Is a Connection Between Black Holes and Time Machines Possible?
- Sandhani Boruah
- · Replies 4 ·
Graduate Dark Matter: Why doesnt dark matter coalesce 'into' Ordinary Matter - Repost
- curiouschris
- · Replies 9 ·
Undergrad Black Holes Colliding: Evidence & Expectations
- Johan0001
- · Replies 3 ·
Graduate Mass Profile in Elliptical Galaxies
- RCopernicus
- · Replies 1 ·
Graduate Where Is Dark Matter in the Universe?
- curiouschris
- · Replies 15 ·
Graduate I don't believe in singularities
- omegabeta
- · Replies 10 ·
Graduate Relationship between Ultracold neutrons and neutron stars
- skujesco2014
- · Replies 6 ·
Graduate A Question Concerning Solar Flares
- |Glitch|
- · Replies 8 ·
Graduate Are neutrons in a neutron star relativistic?
- skujesco2014
- · Replies 15 ·
Graduate Is the Universe Actually Collapsing Instead of Expanding?
- stefanow
- · Replies 8 ·
Graduate Making basic astro/cosmo calculations easy with google calculator--examples
- marcus
- · Replies 2 ·
Can Microorganisms Help Us Understand Aging Rates on Other Planets?
- ozzlight
- · Replies 4 ·
Graduate Can You Orbit the Photon Sphere Without Being Pulled into the Event Horizon?
- avito009
- · Replies 2 ·
Undergrad Is it accurate to say 99% of the universe is pure black with no sound?
- zeromodz
- · Replies 4 ·
Graduate When Was the Universe's Expansion Rate Zero?
- SteveK2
- · Replies 53 ·
Graduate Dark Energy an effect of inhomogeneity?
- CKH
- · Replies 5 ·
Graduate Beginning of accelerating expansion
- hendoS
- · Replies 3 ·
Graduate Missing low-metalicity Red Dwarves
- RCopernicus
- · Replies 1 ·
Graduate Why is temperature inversely proportional to the horizon's area?
- David Carroll
- · Replies 7 ·
Graduate How did massive black holes form and grow in the early universe?
- wolram
- · Replies 16 ·
Undergrad Could Super-Bacteria from Space Pose a Threat to Earth?
- Dryson
- · Replies 1 ·
Undergrad Gravitational Lens with home scope?
- mishima
- · Replies 2 ·
Graduate Unraveling the Mysteries of Dark Energy and Dark Matter in the Universe
- gianeshwar
- · Replies 6 ·
Graduate Where can I find an updated Milky Way density profile for my simulation?
- RCopernicus
- · Replies 4 ·
Graduate Who should we give credit for considering the possibility of Black Hole?
- avito009
- · Replies 6 ·
Graduate Infinite Regress | Why is everyone telling me I am wrong?
- iDimension
- · Replies 40 ·
Graduate How far from Event horizon are you safe?
- avito009
- · Replies 7 ·
Graduate Is hyperbolic space consistent with homogeneity?
- center o bass
- · Replies 4 ·
Graduate Why is stellar ash found in the core of a White Dwarf so dense?
- avito009
- · Replies 2 ·
Graduate The fabric of the cosmos - Universe or Multiverse
- benlahbib
- · Replies 2 ·
Graduate How can black holes coexist with the expanding universe?
- Grajek
- · Replies 22 ·
Graduate Gravity and Gas Pressure on an Accelerating Object
- Dryson
- · Replies 2 ·
Graduate Can another blackhole pull you out of the event horizon of a blackhole
- maa105
- · Replies 34 ·
Graduate Horizon distance at last scattering surface
- Orodruin
- · Replies 6 ·
Graduate Spiral Galaxies as Gravity Lense
- RCopernicus
- · Replies 3 ·
Graduate Explore Laniakea: The Supercluster Earth is in
- Astronuc
- · Replies 1 ·
Undergrad How does solar wind effects Geomagnetic Field?
- space0
- · Replies 5 ·
Stargazing UY Scuti, the biggest known star, viewed through a telescope
- Haktarfone
- · Replies 6 ·