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 Can black holes form directly from collapsing gas clouds?
- rrchr
- · Replies 15 ·
Graduate Black Hole Event Horizon and the Observable Universe
- nicksauce
- · Replies 89 ·
Graduate Critique of relativistic cosmology
- wolram
- · Replies 2 ·
Graduate Could superfluid baryonic matter explain dark matter?
- MuggsMcGinnis
- · Replies 4 ·
Graduate Recent research relevant to quasar evolution
- Nereid
- · Replies 6 ·
Hubble Mystery Light Puzzles Astronomers
- stevebd1
- · Replies 4 ·
Is love like curved spacetime in this poem?
- marmot
- · Replies 3 ·
Graduate Q: Space expansion and black holes
- grkuntzmd
- · Replies 2 ·
Undergrad Why isn't the sun's rate-of-change in elevation constant?
- irotas
- · Replies 7 ·
Undergrad Physical forces of a space collision
- ElNarin
- · Replies 3 ·
Graduate Source of synchotron radiation causing galactic background noise
- Yakult
- · Replies 1 ·
Graduate Read article on Pulsars, not clear how a sphere sources pole-only emission?
- ndvcxk
- · Replies 3 ·
Undergrad Do different layers of the Sun rotate at different speeds?
- mubashirmansoor
- · Replies 8 ·
Graduate Deriving radial velocity as observed from infinity
- stevebd1
- · Replies 3 ·
Graduate Correcting for sun diameter and refraction in sunrise/sunset equations
- irotas
- · Replies 1 ·
Graduate What Happens Inside a Black Hole If Dark Matter Falls In?
- friend
- · Replies 21 ·
Graduate Have the Laws of Physics Changed Over Time?
- YZFR6
- · Replies 10 ·
Undergrad Where does the galactic distance equation come from?
- Ayame17
- · Replies 2 ·
Graduate Methanol Maser Emission: Strength and Effects on Earth
- smithy
- · Replies 2 ·
Graduate Is the wavefunction nonphysical, and does the universe contain nonphysical stuff?
- Dave2007
- · Replies 64 ·
Undergrad Universal Constants: Books for Laymen about Observable Effects
- Pjpic
- · Replies 1 ·
Undergrad Gravity Leaking = Dark energy increasing
- AnTiGrAvItY
- · Replies 2 ·
Undergrad How large would a moon impact event have to be to affect the Earth?
- Skoll
- · Replies 2 ·
Loud cosmic noise detected from distant space
- RunSwimSurf
- · Replies 9 ·
Graduate Energy required to fracture a planetary mass
- bitrex
- · Replies 2 ·
Graduate Imperfections in perfection? Big bang
- johnintheuk
- · Replies 6 ·
Graduate Is the CDM particle still elusive?
- wolram
- · Replies 1 ·
Astrophysicist Neil DeGrasse Tyson. Death by Black Hole
- jowjowman
- · Replies 41 ·
Graduate Does Density Affect Gravity in the Formation of Neutron Stars?
- electerr
- · Replies 4 ·
Undergrad Proof of the Big Bang and the Age of The Universe?
- RiseAgainst
- · Replies 8 ·
Graduate Why was the steady state theory abandoned in the 1960s?
- LennoxLewis
- · Replies 13 ·
Graduate Is all matter in the universe moving at light speed?
- gabriel4786
- · Replies 12 ·
Graduate Why is dark energy/matter better than a new theory?
- kenewbie
- · Replies 4 ·
Graduate High-redshift quasars in SDSS challenge cosmological models
- turbo
- · Replies 114 ·
Graduate Could There Be a Place in the Universe That's Completely Black?
- ValenceE
- · Replies 6 ·
PF PHOTO CONTEST - I'm in a wide open space (jan3-10)
- matthyaouw
- · Replies 30 ·
Undergrad Milky Way spins faster, has more mass than thought
- Redbelly98
- · Replies 5 ·
Graduate How Did Planets and Moons Form from Cosmic Debris?
- lealla
- · Replies 11 ·
Graduate Universe's Missing Matter and Black Holes
- exwso2001
- · Replies 6 ·
Undergrad Arriving at Friedmann Equation with Newton's Mechanics
- pi.rootpi
- · Replies 9 ·
Graduate Origin of suspected black hole in Omega Centauri
- oldman
- · Replies 33 ·
Graduate Twice as much dark energy as dark matter
- aguycalledwil
- · Replies 9 ·
Graduate Do quasar and galaxy redshifts show periodic quantization?
- Suede
- · Replies 80 ·
High School Why is my Meade NGC-70TC telescope image inverted left-to-right?
- DocZaius
- · Replies 1 ·
Graduate Young galaxy's magnetism surprises astronomers
- Suede
- · Replies 2 ·
Graduate I have a little problem with the big bang
- feloniuspunk
- · Replies 11 ·
Undergrad What is the Electric Field Strength of the Sun?
- DiamondGeezer
- · Replies 7 ·
High School Can a parachute deploy in deep space without an atmosphere?
- QuantumLove
- · Replies 8 ·
Graduate How effective would neutronium armor actually be?
- Tisthammerw
- · Replies 61 ·
Graduate Why not steady and Quasi staedy state?
- Sriram.S
- · Replies 1 ·
Graduate Do quasars have intrinsic redshifts incompatible with black holes?
- Jonathan Scott
- · Replies 25 ·
Graduate Is cherry picking evidence a hindrance to scientific progress?
- wolram
- · Replies 43 ·
Graduate Can the physics of consciousness transcend space-time?
- KennethV
- · Replies 64 ·
What Are Some Stunning Astronomy Pictures?
- _mariyan_
- · Replies 3 ·
High School How do satellites stay in orbit?
- waznboyd
- · Replies 7 ·
Graduate Is Dark Energy Just a Misunderstood Form of Gravity?
- Mephisto
- · Replies 5 ·
Graduate How can the universe be 15 billion years old if light from it took that long to arrive?
- BenClark
- · Replies 10 ·
Graduate Could a Collapsing Universe Result in a Cosmological Blueshift?
- 2203312
- · Replies 2 ·
Graduate Could dark matter be particles existing in higher dimensions?
- Jonjo
- · Replies 1 ·
High School Is the World Really Ending in 2012 as Some Predictors Claim?
- Dingo69
- · Replies 40 ·
Stargazing Why isn't my telescope magnifying properly?
- GetPhysical
- · Replies 22 ·
Graduate Baryon density of the universe at recombination epoch
- 2203312
- · Replies 2 ·
Graduate Moon's Tidal Forces puff up Earth
- Widdekind
- · Replies 7 ·
Undergrad Why Do Satellite Ground Tracks Oscillate in Latitude?
- hhhmortal
- · Replies 2 ·
Graduate Higgs Boson and Hawking Radiation
- Kindayr
- · Replies 5 ·
Graduate Why does light escape expanding space in the balloon model?
- BoyangQin
- · Replies 6 ·
Graduate Can Antimatter Collision Create a Black Hole?
- Ebonscaith
- · Replies 6 ·
Graduate Is the total energy of the Universe Zero?
- LaserMind
- · Replies 5 ·
Graduate Intuitive problems with the standard model
- tickle_monste
- · Replies 2 ·
Photo of Einstein, Hubble, and LeMaitre together?
- knightsod08
- · Replies 2 ·
Graduate Fine tuning - island of stability of our world
- Dmitry67
- · Replies 7 ·
What is the 2 cap/hole on the 5 tube cap of the Celestron 130 SLT used for?
- jaam1969
- · Replies 2 ·
Graduate Modeling Earth's mass accumulation with exponential debris decline
- Widdekind
- · Replies 6 ·
Is Space Exploration Humanity's New Manifest Destiny?
- FlufferNuterFSU
- · Replies 14 ·
High School How Do Spacecrafts Gain Speed in Space?
- Sakha
- · Replies 7 ·
High School Universe is made of baryonic matter
- koolmodee
- · Replies 7 ·
Greek astronomer making simultaneous observations across great distances
- quddusaliquddus
- · Replies 24 ·
Graduate Can condensates at near absolute zero explain black hole event horizons?
- mtisfullofit
- · Replies 1 ·
Graduate Does space itself provide the background for light and gravity?
- wolram
- · Replies 6 ·
High School Info 'bout black holes, and is there one in the center of the galaxy?
- The-BRA!N
- · Replies 3 ·
Graduate How to read a supernova Ia spectrum and its link to dark energy
- pi.rootpi
- · Replies 12 ·
Undergrad How universe gradually becoming flat?
- lol1986
- · Replies 2 ·
Graduate Unveiling the Real Age of the Universe: Could It Change Our Thinking?
- Fluxman
- · Replies 2 ·
Graduate Why would large quantities of dark matter not stick together ?
- mikenovice
- · Replies 3 ·
Graduate Galactic cosmic rays and our world.
- Heneni
- · Replies 3 ·
Graduate Can a black hole become a neutron star as it evaporates?
- bassplayer142
- · Replies 15 ·
Are Non-Carbon Based Life Forms Really Possible?
- Gold Barz
- · Replies 32 ·
Graduate Cosmological Constant or Quintessence
- pi.rootpi
- · Replies 1 ·
Undergrad How does a parsec relate to the age of the univers?
- TalonD
- · Replies 4 ·
Graduate How do astronomers look at historic CMB?
- lol1986
- · Replies 17 ·
Graduate Does the big crunch contradict the second law of thermodynamics?
- bassplayer142
- · Replies 2 ·
Undergrad Inclination of Meteorids and Craters
- theIBnerd
- · Replies 2 ·
Graduate Calculating Wavelengths of Redshift in Cosmology
- Paul_Stone
- · Replies 3 ·
Graduate Tighter bounds on cosmo parameters (Chandra Cluster Cosmology Project)
- marcus
- · Replies 2 ·
Graduate What's the difference between dark energy and quintessence?
- pi.rootpi
- · Replies 2 ·
Graduate Doughnut-shaped Universe: Astronomers say Universe is small and finite
- SF
- · Replies 5 ·
Graduate How do I include the curvature parameter K in the FLRW metric?
- Fleet
- · Replies 3 ·
High School Can light from a star 14 billion light-years away reach Earth?
- BoyangQin
- · Replies 18 ·
Graduate Size of the universe from a different perspective
- WaveJumper
- · Replies 23 ·