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 Chandra ACIS field of view and object size at 500 pc
- Astroyan
- · Replies 1 ·
Graduate How can the Universe be flat and isotropic?
- Jocko Homo
- · Replies 28 ·
Graduate Why does the Universe have a net charge of zero?
- seagull68
- · Replies 5 ·
Graduate Chalnoth case against Loop Quantum Cosmology
- marcus
- · Replies 24 ·
Undergrad What if the gravitational force is
- eranium
- · Replies 19 ·
Graduate Fine Structure Constant Varies With Direction in Space
- sanman
- · Replies 6 ·
Graduate Could Time Symmetry Explain the Arrow of Time?
- DrChinese
- · Replies 15 ·
Undergrad How do supernovae and hypernovae form and what is the corpse left behind?
- Narkotix
- · Replies 2 ·
Undergrad Comet SL9 colliding with Jupiter
- Dav333
- · Replies 6 ·
High School Why Doesn't Air Get Sucked into Space?
- jamesabc
- · Replies 41 ·
Graduate Could the universe be nested recursively like quarks in atoms?
- Caramon
- · Replies 3 ·
Graduate Seeing the Unseen: Visualizing a Rotating Black Hole
- Kevin_Axion
- · Replies 4 ·
High School Kepler-9 b and c planets discovered in 2010
- Orion1
- · Replies 5 ·
Undergrad Are We in the Middle of the Universe?
- PrestonMcCall
- · Replies 13 ·
Graduate Is Matter Still Being Created from Energy?
- DLuckyE
- · Replies 5 ·
Graduate Relativistic Effects on our Observations of the Universe
- Ralph Spencer
- · Replies 3 ·
Graduate Is there preferred reference frame for motion in the universe.
- shomas
- · Replies 16 ·
Undergrad What happens when two black holes orbit and merge?
- lepporddog
- · Replies 2 ·
Undergrad What the hell is a Johnson V Magnitude?
- atay5510
- · Replies 1 ·
Undergrad Question: what is the resistance forming spiral galaxies?
- baywax
- · Replies 4 ·
Is the 'Mars closest in 5000 years' email a hoax?
- Brett13
- · Replies 2 ·
Undergrad Time Frame of Sun on Ecliptic Plane vs Equitorial
- Philosophaie
- · Replies 4 ·
Graduate What is the best sky projection to use for my purposes?
- Simfish
- · Replies 1 ·
Graduate Could Anti-Matter Be Moving Backwards Through Time?
- darkstar05
- · Replies 2 ·
Undergrad Is the Big Bang Still Happening and How Does it Influence the Universe?
- jumpjack
- · Replies 1 ·
Graduate Why can the big bang be both hot and have low entropy?
- Jeltz
- · Replies 12 ·
Graduate Philosophical/quantum implications of Big-Bang singularity
- eloheim
- · Replies 14 ·
Graduate Did the big bang represent an ultimate beginning?
- skydivephil
- · Replies 12 ·
Graduate Can you pull someone out of a black hole with a rope?
- shadower555
- · Replies 5 ·
Graduate Understanding Comoving Hubble Radius
- cepheid
- · Replies 2 ·
Stargazing Velocity of shadow of solar eclipse
- stevmg
- · Replies 1 ·
Undergrad Ask an Astronomer: Mars and the Moon on August 27
- stevmg
- · Replies 3 ·
Undergrad Is cosmic back ground radiation able to somehow not dissapate?
- land_of_ice
- · Replies 5 ·
High School Do distant objects show us the early universe?
- Serpens
- · Replies 7 ·
Graduate The Big Rip: Will Black Holes Be Ripped Apart Too?
- typical guy
- · Replies 1 ·
Undergrad The center of the infinite universe
- AnthonyFB
- · Replies 3 ·
Graduate How to determine the total energy in the universe
- Tipi
- · Replies 12 ·
Graduate Can Supernovae Measurements Constrain the Curvature of the Universe?
- AWA
- · Replies 12 ·
High School Are There Really Green Stars in Our Universe?
- Scott S
- · Replies 6 ·
Stargazing Star gazing with light pollution
- Radrook
- · Replies 5 ·
Graduate What Was the Total Mass Energy Density at Recombination?
- BillSaltLake
- · Replies 2 ·
Graduate Parsing Time in the Very Early Universe
- sderamus
- · Replies 4 ·
Undergrad What is wrong with our understanding of the universe?
- JDługosz
- · Replies 22 ·
Undergrad Where to Find Journal Papers on Dark Matter?
- N83
- · Replies 5 ·
Undergrad Are my Drake equation estimates reasonable?
- MaxwellsDemon
- · Replies 27 ·
Graduate How Do Particles Transition Between Cells in Physics?
- Meatbot
- · Replies 12 ·
And i saw a big red glowing ball.
- jpatrick79
- · Replies 3 ·
Graduate Is the Fate of the Universe Truly Determined by Dark Energy?
- skydivephil
- · Replies 1 ·
Graduate What happens if multiple universes expanding in the same space collide?
- AstroNovice
- · Replies 16 ·
Graduate Do black holes swallow dark matter?
- Naty1
- · Replies 49 ·
Graduate Gravity along a shifted sun-earth line?
- nomadreid
- · Replies 5 ·
Undergrad How is the Nebula theory of star formation tested?
- AdkinsJr
- · Replies 4 ·
Graduate Is the Galactic Coriolis Effect Debunked or Proven?
- The Pilgrim
- · Replies 35 ·
Undergrad Photometric data from SDSS fits files
- kris2010
- · Replies 1 ·
Graduate Could 'Dark Matter' be Nutrinoes?
- KirkDamborg
- · Replies 4 ·
Graduate How do S0 lenticular galaxies form?
- taylrl3
- · Replies 3 ·
Graduate Can matter interact electromagnetically but not gravitationally?
- nesp
- · Replies 17 ·
Graduate Is the standard model of cosmology flawed?
- BruceNakagawa
- · Replies 11 ·
Undergrad How Long is the Moon's Heliocentric Path and Its Mean Speed?
- termina
- · Replies 1 ·
Undergrad Wayward Stars: Has Ejection Ever Been Observed?
- NelsonsXanadu
- · Replies 4 ·
Undergrad Big bang contradicts flat universe?
- lookaround9
- · Replies 10 ·
Undergrad What frequencies and radiations from the Moon affect Earth?
- mreq
- · Replies 16 ·
Graduate What would happen if gather all universe matter into one object.
- ciurio
- · Replies 11 ·
Graduate Can Conformal Weyl Gravity be a Viable Cosmology?
- sourena
- · Replies 1 ·
Graduate Can TV Antennas Pick Up CMB Radiation?
- TheAlkemist
- · Replies 12 ·
Undergrad Where does the Balmer discontinuity occur in stellar spectra?
- amalmirando
- · Replies 1 ·
Graduate HST ultra deep field and angular diameter
- AWA
- · Replies 1 ·
Undergrad Is Our Universe Infinite or Spherical?
- Nasher
- · Replies 48 ·
High School What Direction Are Galaxies Flowing in the Expanding Universe?
- WORMHOLE7777
- · Replies 2 ·
Graduate Does Cyclical Universe Theory Account for Matter Distribution Anomalies?
- Newton2041
- · Replies 1 ·
Graduate Interesting thought about black holes
- iRaid
- · Replies 7 ·
Graduate Dark Matter Missing Mass Really too Much Gravity
- agnifire
- · Replies 7 ·
Undergrad Why did Mars lose its magnetic field and cool down?
- aquitaine
- · Replies 17 ·
Graduate Is There an Infinite Number of Galaxies in an Infinite Universe?
- alexsok
- · Replies 2 ·
High School Why do planets stay in the same orbit instead of falling into the star?
- mreq
- · Replies 6 ·
Graduate What is the fabric of space made of
- planck
- · Replies 166 ·
Graduate Are modern galaxies found in ancient galaxy clusters?
- AWA
- · Replies 7 ·
Graduate Could quantum mechanics create new matter that causes cosmic expansion?
- souljah
- · Replies 2 ·
High School Big bang was an explosion of space and time
- robsharp14
- · Replies 13 ·
Graduate Some slight confusion regarding the dimensionless Hubble parameter h.
- taylrl3
- · Replies 2 ·
Stargazing Mars' orbital telescope and ice rock
- cph
- · Replies 3 ·
Undergrad Has the Gravitational Constant Been Measured on the Moon?
- Blenton
- · Replies 9 ·
High School What causes the strange gravity effects on the Moon?
- crx
- · Replies 8 ·
Graduate Can a Sundial Measure Ecliptic Longitude Accurately?
- Helios
- · Replies 3 ·
Graduate Has an infinitely bouncing universe really been discredited?
- MrQG
- · Replies 16 ·
High School How would lower gravity on other planets affect life?
- mreq
- · Replies 9 ·
Is the Japanese Miniature Universe Experiment Still Ongoing?
- Moviemann345
- · Replies 2 ·
Graduate Could isolated regions of antimatter survive beyond the cosmic horizon?
- ronald_dai
- · Replies 10 ·
Graduate Useful Background Reading on Black Holes
- Chris Hillman
- · Replies 6 ·
Undergrad What is the impact of the Sun's magnetic field flip on Earth and its satellites?
- Philosophaie
- · Replies 1 ·
Undergrad Can universes contain or be contained in other universes?
- Tungamirai
- · Replies 4 ·
Graduate Earth's axis of spin w.r.t. galactic rotation axis
- Creator
- · Replies 6 ·
Undergrad Can someone explain Pulsars and Quasars?
- Biologik
- · Replies 1 ·
Graduate Eddy currents due t into the core of the Earth
- lp1225
- · Replies 13 ·
High School Why Do Some Months Have 30 or 31 Days While February Has 28?
- mreq
- · Replies 41 ·
Great Graffiti Stop Motion Big Bang Big Boom
- baywax
- · Replies 2 ·
Graduate How can dark matter exist if it doesn't react to magnetic fields?
- Biologik
- · Replies 1 ·
Graduate Can we analytically continue the Standard Model?
- jackmell
- · Replies 4 ·
Graduate What is the process for deriving a galaxy's (i.e. Milky Way) wavelength?
- cloud_sync
- · Replies 7 ·