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 Is the Dark Matter Hypothesis Failing to Explain Galaxy Formation?
- Saul
- · Replies 46 ·
Undergrad Why Don't Stars Expand with Space?
- menniandscience
- · Replies 2 ·
Graduate Is M-theory Defined by Speculative Events?
- tohamas
- · Replies 8 ·
Graduate Is there more to the universe than what we can see?
- seto6
- · Replies 3 ·
Graduate Couple of questions about black holes and event horizons
- Varine
- · Replies 23 ·
High School How much of space has humanity observed?
- Unit
- · Replies 1 ·
Graduate WMAP evidence for cosmic neutrino background and early star formation
- SF
- · Replies 4 ·
High School Does space end or continue forever, and what does that mean for its shape?
- spaceends
- · Replies 6 ·
Graduate Can science explain what the universe expands into?
- menniandscience
- · Replies 9 ·
Undergrad Does water on Mars and the Moon expand the habitable zone?
- cstoos
- · Replies 4 ·
NY Times Article: Mater vs. Anti-Mater
- diogenesNY
- · Replies 1 ·
Undergrad Is Dark Matter a Cop-Out in Cosmology?
- chuchulainn
- · Replies 3 ·
Graduate Quark Degeneracy? String Degeneracy? (and the effect on Black Holes)
- mjacobsca
- · Replies 2 ·
Undergrad Simple description of a Singularity
- tit4tat
- · Replies 12 ·
Undergrad Why didn't gravity collapse the early universe after the Big Bang?
- Bolo1
- · Replies 24 ·
Graduate Why do we need inflation to explain the homogeneity of CMB?
- petergreat
- · Replies 6 ·
Graduate Explosion/expansion isn't there a period of acceleration
- awestruck
- · Replies 10 ·
Graduate Could the Mass in the Universe Be Infinite?
- cragar
- · Replies 19 ·
Undergrad Did the big bang create space or time?
- klij
- · Replies 28 ·
Graduate Why light curves around objects of mass. 3 answers. 3 questions.
- D.S.Beyer
- · Replies 13 ·
Graduate Are galaxies losing mass or gaining density or both?
- D.S.Beyer
- · Replies 1 ·
Stargazing Can Telescope Size Indicate Wavelength Range?
- Zman
- · Replies 4 ·
Graduate Here's a question i hope someone can answer
- Quantumraptor
- · Replies 4 ·
Graduate Sagitarius A and its Possible Escape from a Black Hole
- Philosophaie
- · Replies 3 ·
Future of human spaceflight (again)
- Mu naught
- · Replies 11 ·
Undergrad Where Can I Find a Paper on Dark Matter Density Percentages in the Universe?
- krishna mohan
- · Replies 4 ·
Undergrad What objects have hyperbolic trajectories and how do they differ from parabolic ones?
- Maria76
- · Replies 2 ·
Graduate Can microscopic wormholes pass through larger wormholes without collapsing?
- thehindmost
- · Replies 2 ·
Graduate Is there a theory that we are in an eternal loop? Multiverse?
- dangerflow
- · Replies 14 ·
Graduate Where is the Remnant of the Star that Gave Birth to our Solar System?
- Mu naught
- · Replies 7 ·
High School What Caused Jupiter to Lose a Stripe?
- Stanwyck66
- · Replies 1 ·
Graduate Curvature of space and dark matter
- moronthat
- · Replies 3 ·
Graduate What should we be doing for future astronomers?
- Mekon
- · Replies 4 ·
Undergrad If we could see 13.7 Billion lyears away?
- RCulling
- · Replies 6 ·
Undergrad Can a white hole expel matter from a parallel universe?
- connectivity
- · Replies 5 ·
Graduate Gravitational Energy Equation of State Parameter
- Ranku
- · Replies 8 ·
What is the energy that moon got on us?
- mreq
- · Replies 3 ·
High School Is it true that gravitation on the full moon day is less than other days?
- mreq
- · Replies 20 ·
Graduate Gravitational Model of Tides: Earth and Sun Potential Addition
- frogeraie
- · Replies 1 ·
High School Do sattelites orbit with the rotation of the earth?
- Russell_B
- · Replies 5 ·
Graduate What formulas do I need to solve the above problems?
- Red_Night
- · Replies 5 ·
Graduate How did scientists conclude the universe formed from nothing?
- Mathnomalous
- · Replies 74 ·
Undergrad What does When the Universe was one minute old mean?
- John Bleau
- · Replies 39 ·
Graduate If the universe is closed - scenario question
- Mekon
- · Replies 1 ·
Graduate Looking into the past with telescopes
- Darkmisc
- · Replies 4 ·
Graduate Pulsar, quasar, and magnetar observations versus textbook models
- Saul
- · Replies 35 ·
Graduate Limit to Expansion of the Universe
- Krombacher
- · Replies 20 ·
Graduate How is Heliocentric Earth Longitude Measured?
- spossatamente
- · Replies 18 ·
Graduate Negative energy versus positive energy
- hurk4
- · Replies 14 ·
Graduate SMB Feeding Problem Dark Matter Problems
- Saul
- · Replies 1 ·
Graduate Can a Magnetic Field Escape a Black Hole?
- cragar
- · Replies 8 ·
Graduate How Are Pressure and Density Defined in the Comoving Coordinate System?
- bloby
- · Replies 8 ·
Graduate Part of universe mapped by coordinates
- bloby
- · Replies 2 ·
Undergrad What Determines the Differences in Life Across Different Planets?
- awestruck
- · Replies 7 ·
Graduate Is Dark Energy Just a Myth in Modern Science?
- Mu naught
- · Replies 43 ·
Graduate Can we see the Milky Way's light from billions of years ago?
- Valcken
- · Replies 1 ·
Graduate Can I Travel Faster Than Light While Considering Relativity?
- ElectroBurger
- · Replies 6 ·
Graduate Cosmological redshift as a Doppler effect or metric evolution?
- AWA
- · Replies 1 ·
Undergrad Terminology: Dwarf Planet vs. ProtoPlanet
- DaveC426913
- · Replies 3 ·
Graduate Request permission to discuss Schild's papers
- Saul
- · Replies 3 ·
High School Will a black hole revolve around a non-black hole object with greater mass?
- d-wat
- · Replies 2 ·
Lunokhod 1 found But why lost in the first place?
- GreatBigBore
- · Replies 16 ·
Graduate What is the Debye length in plasmas?
- Nylex
- · Replies 6 ·
Graduate Could extrasolar gas giants have Earth-sized moons in their own habitable zones?
- ThomasEdison
- · Replies 6 ·
Graduate Which cosmological model do you find most compelling?
- kathykoo9
- · Replies 4 ·
Graduate What is and is not Mainstream Astrophysics?
- Saul
- · Replies 1 ·
Graduate What can we determine from age, U-B, B-V, and V data for star clusters?
- randa177
- · Replies 7 ·
Graduate What is the Scale of Homogeneity in the Universe and How is it Measured?
- skippy1729
- · Replies 5 ·
Graduate What will the universe *look* like in 15 billion years from now ?
- Nikarasu M
- · Replies 3 ·
Graduate How can the universe be 50 billion light-years across if it's only 13 billion years old?
- Hacky
- · Replies 11 ·
Graduate Earth-like Gravity: What Effects on Small, Dense Objects?
- ThomasEdison
- · Replies 2 ·
Undergrad Is there a term for the vertical elongation of a planet?
- dotancohen
- · Replies 3 ·
Undergrad Black Holes emitting jets of gas?
- OrionVTOL
- · Replies 10 ·
Graduate How could the big bang create time?
- jkxzgyk
- · Replies 1 ·
Graduate Do MECOs Challenge the Existence of Classical Black Holes?
- Saul
- · Replies 6 ·
High School How Much Would Your Weight Change on the Surface of the Sun?
- kathykoo9
- · Replies 1 ·
Graduate Accelerating Expansion, or Constant?
- IcedEcliptic
- · Replies 2 ·
Graduate How does the velocity of light change in the vicinity of a black hole?
- Starwanderer1
- · Replies 15 ·
High School Why Do Things Spin? Solar Systems, Planets, Galaxies
- piccini9
- · Replies 4 ·
Graduate How could matter with finite parts originate from a dimensionless point?
- stevenbhester
- · Replies 11 ·
Stargazing What are the best telescopes for beginner astronomers on a budget?
- KrisOhn
- · Replies 27 ·
Graduate Is There Mathematical Proof That Stars Are Still Being Formed?
- Max.Planck
- · Replies 3 ·
Graduate Transfer orbits for dummies A hillbilly tutorial.
- Jenab
- · Replies 45 ·
Graduate Eccentricity and specific mechanical energy
- Rasalhague
- · Replies 7 ·
Graduate Can time experience redshift like space does?
- Exmech
- · Replies 3 ·
Graduate So, is it correct to measure centrafugal force due to a planet's rapid orbit?
- calis
- · Replies 1 ·
Can I find a free 2010 sky almanac on line?
- jackmell
- · Replies 4 ·
Graduate Where does the kinetic energy of galactic motion appear in the standard model?
- h1ghf1ve
- · Replies 8 ·
Undergrad What Would Happen if a Gamma Ray Burst Hit Our Sun?
- Random?Guy
- · Replies 1 ·
High School Are galaxies fairly evenly distributed?
- abcdan
- · Replies 11 ·
Graduate Is the universe accelerating it's expansion?
- BernieM
- · Replies 10 ·
Graduate Angular size-redshift relation at high redshifts
- TrickyDicky
- · Replies 1 ·
Graduate Where does space expansion exceed light speed and why are distant galaxies so far away?
- thecow99
- · Replies 12 ·
Graduate Why does the CMB recede at 10.4 times the speed of light?
- HarryWertM
- · Replies 6 ·
Undergrad How can ice persist on asteroid 24 Themis at 3.2 AU?
- Stanwyck66
- · Replies 3 ·
Graduate Did inflation itself make the universe bigger than what we currently observe
- GreatBigBore
- · Replies 7 ·
Undergrad Jupiter-sized Planet Lurking in Oort Cloud?
- sanman
- · Replies 1 ·
Undergrad How can we know that the universe is expanding
- abhi2005singh
- · Replies 13 ·
Space Travel Videos: Find 10-20 min Video for Seminar
- eveo
- · Replies 3 ·
Graduate Singularity and Anti singularity
- thehindmost
- · Replies 9 ·