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
High School No big planets close to the Sun?
- verdigris
- · Replies 6 ·
Undergrad Water on Mars: Separating Fact from Fiction - Textbook Deadline Approaching!
- DaveC426913
- · Replies 2 ·
Undergrad Black holes, the sun and wormholes.
- Orl13
- · Replies 1 ·
Graduate Will the new WMAP3 data challenge the assumption of a spatially flat universe?
- marcus
- · Replies 110 ·
Undergrad Why doesn't Olbers's paradox apply to the night sky?
- Peter (IMC)
- · Replies 32 ·
Undergrad Are craters on the moon randomly distributed?
- verdigris
- · Replies 7 ·
Undergrad Does Uranus Have a Distinct Rocky Core?
- DaveC426913
- · Replies 1 ·
Graduate Are Long GRBs caused by PopIII hypernovae?
- Garth
- · Replies 2 ·
I'm Living in the Astronomy Section
- MadScientist 1000
- · Replies 2 ·
Undergrad Are other planets getting hotter like the Earth?
- verdigris
- · Replies 13 ·
Undergrad Quick easy questionFormula for angular diameter?
- Soylentgreen
- · Replies 2 ·
Astonishing Photo of Russian Rocket Booster Explosion!
- russ_watters
- · Replies 3 ·
Graduate New Guth paper-reviewing by-now-familiar scenario
- marcus
- · Replies 2 ·
Undergrad Where Can I Find the Mathematics in Nucleosynthesis?
- sruthisupriya
- · Replies 2 ·
Graduate Time Measurement on Earth vs the Universe
- petermorrisjr
- · Replies 3 ·
High School Is the Apophis Asteroid a Serious Threat and What is NASA Doing About It?
- pixel01
- · Replies 1 ·
The smartest man in universe believes in Intelligent Design
- PIT2
- · Replies 110 ·
Undergrad Good introductory astrophysics textbooks
- FUNKER
- · Replies 8 ·
Graduate Why do we Still Believe in Newton's Law?
- wolram
- · Replies 1 ·
Stargazing First is the Blue Snowball , a planetary nebula.
- russ_watters
- · Replies 3 ·
Graduate Temperature Effects of a Doubled Radiation Emission from an HII Region
- Poppop
- · Replies 1 ·
Graduate Reaction rate and Hubble parameter in early universe
- Magister
- · Replies 3 ·
I know, lets launch a car into space
- matthyaouw
- · Replies 13 ·
High School Really Simple Circumference Question
- Iritscen
- · Replies 7 ·
Undergrad Eclipsing binary problem im really frustrated
- Soylentgreen
- · Replies 3 ·
Graduate Do relativistic bodies affect light paths like black holes do?
- exponent137
- · Replies 2 ·
Scale of the observable universe video
- ScaleMaster
- · Replies 2 ·
Graduate Calculate Total Energy Radiated by Sun During Evolution
- emilykay
- · Replies 1 ·
Graduate How to Determine the Period and Separation of an Eclipsing Binary Star System?
- Soylentgreen
- · Replies 2 ·
Undergrad Having trouble with eclipsing binaries.
- Soylentgreen
- · Replies 3 ·
Undergrad Unsolved problems in astrophysics
- Terilien
- · Replies 1 ·
Undergrad How come we can see galaxies 9 B l/y away if universe is only 14 B y/o
- moe darklight
- · Replies 8 ·
Graduate Deriving the flatness problem relation from Friedmann equations
- Magister
- · Replies 7 ·
Graduate Is Energy Fully Conserved in an Expanding Universe?
- hurk4
- · Replies 7 ·
Graduate How does cosmological redshift change with time?
- Magister
- · Replies 13 ·
Graduate When does the event horizon form?
- Flatland
- · Replies 2 ·
Graduate Bullet cluster shows dark matter separated from hot gas
- Chronos
- · Replies 14 ·
Graduate UMC Time, Right Ascension and Longitude
- whatta
- · Replies 12 ·
Graduate Atmospheric Refraction: Converting Density Profiles to Refractivity
- natski
- · Replies 1 ·
Detecting transmission signal destinations
- antistar_
- · Replies 12 ·
High School Will the Milky Way and Andromeda collide or pass through each other?
- Plasma
- · Replies 5 ·
Graduate Tolman Surface Brightness Test -
- _Andreas
- · Replies 10 ·
Undergrad If space originated from the Big Bang, how can infinite space expand?
- Wellsi
- · Replies 4 ·
Undergrad Black Holes in a Newtonian (non-Einsteinian) World
- Izzhov
- · Replies 2 ·
Graduate What are B mode and E mode signals?
- man@SUT
- · Replies 2 ·
Graduate Why does surface brightness decrease by (1+z)⁴ in Tolman's test?
- _Andreas
- · Replies 3 ·
Undergrad Infinite Energy and the Big Bang: Understanding Heat as Energy in Physics
- elloyd
- · Replies 5 ·
Graduate New universes will be born from ours
- SF
- · Replies 1 ·
Undergrad Friendly discussion: How do you feel the singularity came to be?
- Nexus555
- · Replies 15 ·
Stargazing Build Concave Mirrors Up to 1.5M Dia: Design a Grinding/Polishing Machine
- les trickett
- · Replies 3 ·
Public Star Parties: Learn What to Expect at Your First Event
- YellowTwo
- · Replies 2 ·
Graduate GPB: Latest News and Research Results
- Chronos
- · Replies 3 ·
Graduate Converting cosmological constant from cm⁻² to g/cm³
- stevebd1
- · Replies 16 ·
Undergrad Is the Conservation of Mass/Energy Challenged by the Big Bang Theory?
- Robert J. Grave
- · Replies 17 ·
Graduate Why is the peak frequency of the Cosmic Microwave Background 160 GHz?
- Nim
- · Replies 2 ·
Graduate Holographic principle responsible for life?
- Mike2
- · Replies 6 ·
Undergrad How do we determine what's in the core of stars/planets?
- mace2
- · Replies 2 ·
Graduate Neutral electron gas in galaxy halo?
- smm
- · Replies 5 ·
Undergrad Uranium and supernovae explosions
- verdigris
- · Replies 2 ·
Graduate Why vacuum energy, dark energy, entropy and age ratios all equal ~10^121
- Juan Casado
- · Replies 7 ·
Graduate First 3D Map of Dark Matter in the Universe
- neutrino
- · Replies 7 ·
Graduate Creating a Realistic Virtual Universe: An Astrophysics Problem
- inbuninbu
- · Replies 2 ·
Undergrad What does a medieval cosmology essay question actually ask?
- cherbd16
- · Replies 9 ·
Astronomy Olympiad exam questions
- ritwik06
- · Replies 6 ·
Energy and matter Is that all that fills our universe?
- Rodney Flores
- · Replies 12 ·
Undergrad Are hotter stars always brighter?
- whatta
- · Replies 2 ·
Graduate Nobel Prize in Physics 2006 (Mather and Smoot)
- robphy
- · Replies 8 ·
Undergrad The speed of light and the expansion of the universe
- Robert J. Grave
- · Replies 6 ·
Graduate Is Our Consciousness Immortal Through Multiple Universes?
- michael879
- · Replies 12 ·
Graduate Equation for Solid Planet Structure
- Helios
- · Replies 5 ·
High School Round trip to earth in a straight line?
- kasse
- · Replies 12 ·
Graduate Is the Hyperboloid Model Truly Homogeneous and Isotropic?
- quantum123
- · Replies 3 ·
What is the identity of the enigmatic I in this timeless puzzle?
- K Sengupta
- · Replies 3 ·
Undergrad How do we really know the universe is expanding?
- cdm1a23
- · Replies 14 ·
High School Sun's Polar Shift on 2012 coincidence?
- TheMuses
- · Replies 1 ·
Graduate Multiverse theory, where are they?
- blumfeld0
- · Replies 18 ·
High School Star Density Should be a piece of cake
- gothicpie
- · Replies 2 ·
Graduate Can Any Theory Unify Wave/Particle, Space/Time, and Energy/Mass Dualities?
- jrrship
- · Replies 18 ·
Undergrad What is the critical density of the universe?
- Olivia Grace
- · Replies 7 ·
High School Birght comets like Comet McNaught
- pivoxa15
- · Replies 12 ·
Undergrad Experiment with multiple instrument places all over the earth
- ritwik06
- · Replies 5 ·
Undergrad Calculating Solar Constant at Sunset: How Much Energy Will Be Received?
- ritwik06
- · Replies 2 ·
Graduate Best fit three-sphere radius 130 gly (after Ned Wright)
- marcus
- · Replies 1 ·
High School Parallax Questions: Confirm Answers are Right?
- pianoparadise
- · Replies 1 ·
Graduate What are some good reference materials for my dark matter presentation?
- Aschere
- · Replies 1 ·
Undergrad Does Andromeda contain dark matter?
- quantum123
- · Replies 7 ·
Undergrad US military plans for space weapons and resource monopolization
- theCandyman
- · Replies 37 ·
Graduate Difference between inflationary and true vacuum
- emanaly
- · Replies 17 ·
Graduate Light/ universe questions from a layman
- orzos
- · Replies 26 ·
Graduate Two identical spiral galaxies with opposite momenta merge
- ritwik06
- · Replies 2 ·
Where can I find an astrophysics simulator?
- Prof_Atis
- · Replies 9 ·
Graduate Evidence for an expanding universe and the Big Bang
- SpaceTiger
- · Replies 126 ·
Graduate FRW from spaces of constant cuvature
- Mike2
- · Replies 6 ·
Graduate Who else writes cosmology simulation code like Gadget2?
- Allday
- · Replies 3 ·
Comet McNaught could be the brightest ever recorded
- russ_watters
- · Replies 8 ·
Graduate Why does the Hubble show galaxies in all directions if the big bang had a center?
- Nexus555
- · Replies 11 ·
High School How Long Does It Take To Orbit Our Galaxy
- osirisisis
- · Replies 3 ·
Undergrad Is a Sunshade the Solution for Earth's Drought and Heat?
- nantz
- · Replies 4 ·
Undergrad Red Shifts and the expanding universe
- WendyE
- · Replies 47 ·
High School Earth's orbital velocities at perihelion and aphelion
- cscott
- · Replies 1 ·