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 Gravitational Influence of Stars in a Galaxy
- Bruce Williams
- · Replies 11 ·
Undergrad Where does the energy come from for Enceladus' geysers?
- #Thomas#
- · Replies 17 ·
Graduate Possible Way to Measure Dark Energy?
- Orthokid
- · Replies 5 ·
Undergrad Which field deals with this(Astronomy,Astrophysics) ?
- Christian Grey
- · Replies 3 ·
Graduate Do the black holes have infinite mass ?
- kapoor_kapoor
- · Replies 3 ·
Graduate Does Black Hole Information Storage Suggest a Holographic Universe?
- alex2515
- · Replies 6 ·
Graduate How we are still able to detect CMB photons?
- CuriousNilave
- · Replies 4 ·
Graduate Is the Total Energy of the Universe Really Zero?
- thinkandmull
- · Replies 16 ·
Graduate Why is the Universe (nearly) flat?
- wabbit
- · Replies 48 ·
Undergrad What percentage of galaxies have central black holes?
- Omega0
- · Replies 7 ·
High School Dark matter, what do we need to have here?
- Jose Leal
- · Replies 11 ·
Graduate Is there a size or duration limit on fields having mass?
- slatts
- · Replies 14 ·
Graduate The case for [or against] dark matter
- Chronos
- · Replies 32 ·
Undergrad How the satellite parts get damaged
- praveena
- · Replies 16 ·
High School Lunar and Solar eclipse - same times a year?
- christian0710
- · Replies 8 ·
High School If the universe is infinite, was there infinite matter at the Big Bang?
- Rupert Young
- · Replies 49 ·
Graduate Kepler's Second Law - reaching an unsolvable equation?
- Upsilon
- · Replies 17 ·
High School Can viscosity of space explain cosmological redshift?
- Kevin Haney
- · Replies 1 ·
Graduate Is Galilean Creation a Viable Alternative to Inflationary Cosmology?
- Chronos
- · Replies 9 ·
Undergrad Neil deGrass Tyson "Orbital Erosion"
- mgkii
- · Replies 2 ·
High School The sun at midnight from North Pole
- Pjpic
- · Replies 5 ·
Undergrad Age of the observable Universe?
- G.D.
- · Replies 18 ·
Graduate Universal Gravity: Does It Affect Us Beyond the CEH Line?
- Gaz
- · Replies 3 ·
Graduate What happens when a high-mass black hole collides with a low-mass one?
- praveena
- · Replies 15 ·
Graduate Is the Universe's Expansion Truly Accelerating Based on Redshift Observations?
- Vidar T
- · Replies 8 ·
Undergrad Calculating AU from the 2012 Venus transit using parallax
- YarnJunior
- · Replies 3 ·
Graduate Understanding Coherent Large Scale Modes in Power Spectra
- shirin
- · Replies 4 ·
Graduate Will the Universe Collapse Soon?
- wolram
- · Replies 1 ·
Graduate Can a closed universe be considered a closed system?
- Neptune2235
- · Replies 6 ·
Graduate Quantum tunnel into becoming solid iron
- Stephanus
- · Replies 10 ·
Undergrad Peanut-shaped near-Earth asteroid imaged by radar
- Spinnor
- · Replies 4 ·
Graduate Why is there more matter than antimatter at this point?
- Liza_semi-nerd
- · Replies 8 ·
Graduate How can the observable universe be 46 billion lyrs in size?
- Rupert Young
- · Replies 38 ·
How is the ISS Captured Using a Telephoto Lens?
- Andy Resnick
- · Replies 12 ·
Graduate What happens to atoms and matter during heat death of the universe?
- Stephanus
- · Replies 15 ·
Undergrad HD 219134b: closest rocky exoplanet at 21 light years
- PWiz
- · Replies 8 ·
Graduate Why inflation is needed despite assuming a flat, uniform early universe
- DiracPool
- · Replies 43 ·
Undergrad How did planets get their Orbits?
- Iseous
- · Replies 12 ·
Graduate Can LQC be distinguished from normal inflation through observational windows?
- palmer eldtrich
- · Replies 11 ·
Graduate Predicted Heat Death of the Universe
- JonathanCollins
- · Replies 18 ·
Graduate Does the standard model define the phase space of the universe?
- Jimster41
- · Replies 9 ·
Undergrad Why does a black hole have stronger gravity than its progenitor star?
- AF HUNZAI
- · Replies 5 ·
High School What is the center of the universe?
- KylieVegas
- · Replies 38 ·
Graduate Can unfalsifiable pre-Big Bang theories produce useful research?
- anorlunda
- · Replies 10 ·
Graduate Can distant aliens detect infrared radiation from my body during yoga?
- kos
- · Replies 7 ·
Graduate Did Time Exist Before the Big Bang?
- Robert P
- · Replies 26 ·
Undergrad Astrophysics uses wave optics or geometrical optics?
- Christian Grey
- · Replies 1 ·
Graduate Dark matter particle search at CERN vs cosmology simulations
- ohannuks
- · Replies 9 ·
Graduate Is Terraforming Uranus And Neptune Possible?
- Jupiter60
- · Replies 10 ·
Graduate Newtonian Friedmann Equation, Referance frame, Homogeneity
- RyanH42
- · Replies 28 ·
Graduate Why Photons Can't Explain Dark Matter
- Docon
- · Replies 8 ·
Undergrad How do we know the universe is infinite?
- Rupert Young
- · Replies 39 ·
Graduate What actually happens when the black hole takes the photons
- Preslav
- · Replies 2 ·
Graduate Which dimension does the black hole belongs?
- praveena
- · Replies 15 ·
High School How Fast Is the Moon Moving Away from Earth?
- elistein
- · Replies 6 ·
Insights LCDM cosmological model in simplified math (part 3)
- Jorrie
- · Replies 5 ·
Graduate Can Black Holes Truly Absorb All Matter and Energy?
- Shailesh Pincha
- · Replies 3 ·
Insights Approximate LCDM expansion in simplified math (part 2)
- Jorrie
- · Replies 14 ·
Graduate Does Fleming's right hand rule explain Earth's orbit?
- EtherURWithMe
- · Replies 6 ·
Undergrad Term for space in front of the expanding universe.
- Federico777
- · Replies 1 ·
Graduate Expansion is a compounded error based on a wrong assumption?
- Dry
- · Replies 3 ·
Graduate Measuring the entropy of the universe?
- noahcharris
- · Replies 3 ·
Graduate Variable Speed Of Light In General Relativity
- Paradigm Shift
- · Replies 6 ·
Graduate New Theory: Dark Matter Acts Like Pion - Evidence Found
- RyanH42
- · Replies 5 ·
Undergrad How do they know distance of the original standard candle?
- james gander
- · Replies 3 ·
Undergrad Earth-Like Planet orbits Sun-Like Star
- Quotidian
- · Replies 3 ·
Graduate Why does critical density have factors of 3H₀² and 8πG?
- Luminescent
- · Replies 9 ·
Graduate From Aeon to Zeon to Zeit, simplifying the standard cosmic model
- marcus
- · Replies 277 ·
High School Does theory of expansion effect gravity?
- Shankar Dev
- · Replies 8 ·
Graduate Is there a theoretical min. size/mass limit to a black hole?
- DDH
- · Replies 9 ·
Undergrad Is the Fermi Gamma Ray Detector Capable of Detecting Individual Photons?
- anorlunda
- · Replies 5 ·
Graduate Utility of observational Hubble parameter data on DE
- Garth
- · Replies 26 ·
Undergrad Why Pluto's diameter excludes atmosphere but Jupiter's includes it
- 1977ub
- · Replies 14 ·
Graduate Cumulative number counts of galaxy clusters
- mahya
- · Replies 2 ·
Graduate Why do we believe dark matter exists?
- badseed
- · Replies 32 ·
Graduate What does it mean to have a Black Hole Spike?
- majormuss
- · Replies 1 ·
Graduate Are Saturn's Rings Caused by Fractal Structures?
- Jimster41
- · Replies 3 ·
Graduate Photons and Space-Time Expansion
- CjCastro
- · Replies 5 ·
Undergrad Can two stars in a binary system have intersecting orbits?
- RingNebula57
- · Replies 6 ·
High School Is it possible to keep a rip in space open? All info welcome
- nrot
- · Replies 3 ·
Undergrad Do quasars and blazars exist today?
- Jupiter60
- · Replies 1 ·
Graduate What's the Dark Matter Density in Universe?
- RyanH42
- · Replies 13 ·
Graduate Does space expansion affect the rate of time?
- Gerinski
- · Replies 18 ·
Graduate Non-Flat ΛCDM Model: Consistency with BOSS Result on Universe Curvature
- wolram
- · Replies 2 ·
Insights Approximate LCDM Expansion in Simplified Math - Comments
- Jorrie
- · Replies 11 ·
Undergrad Function driven solar system model.
- abdullahi abass
- · Replies 2 ·
Graduate Ring nebula imaging at 800mm with central star resolved
- Andy Resnick
- · Replies 5 ·
Undergrad How can we see galaxies behind other galaxies?
- theironmaiden
- · Replies 9 ·
Undergrad What causes gravity to form stars from nebulae?
- thecosmos123456
- · Replies 49 ·
High School Why does the Hubble telescope show the past universe?
- revv
- · Replies 15 ·
Undergrad Calculating mass of Milky way Galaxy
- RyanH42
- · Replies 5 ·
Graduate Similarities and differences Black Holes and Big Bang
- Gerinski
- · Replies 1 ·
Graduate Is Dark matter homogeneous in Universe?
- RyanH42
- · Replies 19 ·
High School How far can transmissions go in space?
- cellurl
- · Replies 4 ·
Graduate Does gravity get destroyed in a black hole ?
- lee sarson
- · Replies 3 ·
High School Is Pluto Really Bigger Than Eris? New Horizons Settles the Debate.
- CygnusX-1
- · Replies 4 ·
Stargazing Is there a proper way to clean a telescope mirror?
- SofiaMo
- · Replies 6 ·
Graduate Has someone solved the cosmological constant problem?
- RyanH42
- · Replies 21 ·
Undergrad Big Bang Expansion Creates Planets?
- Onehope
- · Replies 3 ·
Graduate Proportions and other Stuff about Expansion
- ComaBerenices
- · Replies 5 ·