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 Some questions for want of answers:
- Naveen345
- · Replies 10 ·
Graduate How do we determine the production of H and He during BBN?
- pianoplayer98
- · Replies 1 ·
Graduate Planck Intermediate Results. IX. Detection of the Galactic haze with Planck
- d3mm
- · Replies 2 ·
Graduate Distribution of stars by Metallicity and Redshift
- pianoplayer98
- · Replies 4 ·
Stargazing Zhumell Z12 vs Meade Light Bridge 10
- CowedbyWisdom
- · Replies 11 ·
Can the moon be viewed an night at the same time from two positions 77deg apart
- rhizuli
- · Replies 1 ·
Undergrad Which mathematical formulas are used in the search for extraterrestrial planets?
- Gliese123
- · Replies 5 ·
Graduate SPT-SZ Survey Results: New Neutrino Species Suggested
- Chronos
- · Replies 4 ·
Graduate Cannot stand the eternity in cyclic models
- xponential
- · Replies 13 ·
Graduate Can Black Holes Be Used for Faster-Than-Light Travel?
- dbmorpher
- · Replies 2 ·
High School Earth revolves in eliptical path?
- wasi-uz-zaman
- · Replies 2 ·
Undergrad Launching an object into OUTER space
- mrxyz
- · Replies 36 ·
Graduate Mass distribution and gravitational field
- Frank66
- · Replies 6 ·
High School Why is entropy so important in physics?
- Homesick345
- · Replies 21 ·
Graduate Integrating Friedmann Equation of Multi-component universe respect to a and t
- 4everphysics
- · Replies 2 ·
Undergrad How Do You Choose What Scientific Papers to Read?
- Lino
- · Replies 4 ·
Graduate Higher sensitivity CMB mapper (EBEX) launched
- marcus
- · Replies 3 ·
Graduate Can We Determine the Center of the Universe Using Comet Orbits?
- shivakumar06
- · Replies 59 ·
Graduate Question involving space travel and the expansion of the universe
- anonymous3
- · Replies 3 ·
Graduate Can we ever find the ultimate origin of the universe?
- Vaid
- · Replies 4 ·
High School Sun's path in the sky during Equinox if watching from equator?
- Lebombo
- · Replies 15 ·
Graduate Did Stephen Hawking address time before the Big Bang and other universes?
- cdux
- · Replies 37 ·
Graduate How do the 3/5 and 3/2 factors arise in the virial theorem?
- shounakbhatta
- · Replies 1 ·
Undergrad How will the pattern of stars in the milky way change over time?
- alemsalem
- · Replies 8 ·
Graduate Black holes: Some astronomers detected flashes of x-ray in the cosmos
- pramod_kharel
- · Replies 4 ·
Graduate What do the Faber-Jackson and Tully-Fisher relations explain?
- shounakbhatta
- · Replies 4 ·
Graduate Why do smaller black holes emit more Hawking radiation?
- tensor33
- · Replies 10 ·
Graduate Was Energy in the Expanding Universe Traveling at the Speed of Light?
- NeedBranes
- · Replies 19 ·
Graduate What Exists Beyond the Reach of the First Photon in the Universe?
- hypotemoose
- · Replies 5 ·
Undergrad What are dark matter and dark energy?
- plerza
- · Replies 7 ·
Undergrad So the question is:Do all galaxies contain super massive black holes?
- shounakbhatta
- · Replies 9 ·
Graduate Expansion of the Universe - Closed Universe
- Ralph Bucking
- · Replies 2 ·
Graduate How Are We Pushing the Concept of Infinity in Multiverse Theories?
- osxraider
- · Replies 34 ·
Stargazing Can I use Celestron Astromaster 114EQ at latitude -15°?
- MadAtom
- · Replies 15 ·
Graduate Hydrogen Fusion Cycle in Stars: Storage/Transport/Consumption?
- Islam Hassan
- · Replies 5 ·
Graduate What is the scientific consensus on what space is made of?
- sanman
- · Replies 10 ·
Undergrad Elemental Abundance in Stars - The Curve of Growth
- Daniel1992
- · Replies 1 ·
Graduate Time Delays Across Saddles: Probing Modified Gravity in the Solar System
- wolram
- · Replies 2 ·
High School Why Does the Sky Appear Blue? Why Can Stars See Us?
- xzardaz
- · Replies 4 ·
Stargazing How useful are collimation eyepieces?
- AnTiFreeze3
- · Replies 13 ·
Graduate Quantum Entanglement vs. Now Slices (Relativity)
- DrSammyD
- · Replies 3 ·
Graduate How to keep the earth in the habitable zone
- mrspeedybob
- · Replies 9 ·
Graduate Inflation as a solution to the Early Universe Enrtopy problem
- skydivephil
- · Replies 12 ·
Graduate Is Padmanabhan's emergent gravity theory solid?
- Chronos
- · Replies 28 ·
Undergrad Radio Transmission Power and Detection in Relation to Alien Communication
- jim77
- · Replies 15 ·
Undergrad What would happen if Ebb and Flow spacecraft hit the Moon?
- P_I
- · Replies 2 ·
Graduate What is the difference between the Big Bang and the exact same energy mass
- cdux
- · Replies 12 ·
Undergrad Can Excel accurately calculate planet positions in real-time?
- Silverbug
- · Replies 4 ·
Graduate Redshift / blueshift of light in a gravity well
- Lino
- · Replies 17 ·
Undergrad Why are the centers of galaxies so bright?
- jaydnul
- · Replies 8 ·
Undergrad Why don't we see the Geminids twice a year?
- dmayers94
- · Replies 4 ·
Graduate Orbital period - Where does M1+M2 come from?
- cfsenel
- · Replies 8 ·
Graduate Conditions necessary to form the first and simplest structures
- morghen
- · Replies 13 ·
Undergrad Difference between Dark energy and Dark matter
- Farshid.M
- · Replies 1 ·
Graduate Formation of accretion disk / frame drag
- goldsax
- · Replies 2 ·
Graduate Is The Solar System Scale Invariant? A Thought Experiment
- DiracPool
- · Replies 16 ·
Graduate Does spacetime stand on its own?
- Vierstein
- · Replies 2 ·
Graduate Finding an Extrasolar Planet's Radius
- crocvox
- · Replies 2 ·
Graduate Big Bounce and varying constants
- skydivephil
- · Replies 2 ·
Graduate Questions on dark matter and dark energy
- Phantom13
- · Replies 4 ·
Graduate If the Universe is indeed finite(in volume)
- Zelyucha
- · Replies 8 ·
Graduate Uncertainty of distance measurements for regions between 50-250 pc away
- Aiveenoka
- · Replies 4 ·
Undergrad What will the gravitational field inside the Earth be?
- Negi Magi
- · Replies 5 ·
Graduate Planck 2013 Conference: April 2-5
- skydivephil
- · Replies 3 ·
Graduate Loop of pumped fluid slowly falling into black hole.
- P.Bo
- · Replies 4 ·
Graduate Gravitational force Sun/Sirius > Earth/Sun?
- andehpandeh
- · Replies 3 ·
Graduate When would we detect a 3 solar mass black hole approaching Earth?
- CCWilson
- · Replies 18 ·
Graduate What Is the First Acoustic Peak in CMB?
- shadi_s10
- · Replies 5 ·
Graduate Is the following creation description useful?
- Tanelorn
- · Replies 10 ·
Undergrad Solar System's orbit around galaxy, a concise 3D description?
- utenzil
- · Replies 8 ·
Graduate What Other Evidence Supports the Idea of an Expanding Universe Besides Redshift?
- jim77
- · Replies 23 ·
Graduate Surface brightness to luminosity
- Warimi
- · Replies 1 ·
Undergrad How Do We Measure Star Formation?
- shounakbhatta
- · Replies 9 ·
Graduate Density of supermassive black holes.
- seasponges
- · Replies 12 ·
Graduate Big Bang Vs Inflationary Big Bang
- dm4b
- · Replies 5 ·
Graduate Dark matter/Energy not needed alternative
- Mordred
- · Replies 3 ·
Graduate How can I calculate the visual magnitude of a star with only its flux data?
- Schmetterling
- · Replies 3 ·
Graduate Are neutron star surfaces really the smoothest in the universe?
- Catria
- · Replies 29 ·
High School Stars of Constellations exist in what Spiral Arm of the Milky Way Galaxy?
- Philosophaie
- · Replies 19 ·
Undergrad What math does one need to know prior to learning Astrophysics
- MrApex
- · Replies 2 ·
Undergrad Why is the universe expanding if stars could be pulled by a distant mass?
- JPadinske
- · Replies 31 ·
Undergrad Eye of the storm at Saturn's north pole
- stargazer3
- · Replies 3 ·
Graduate Why does everything move away from us if we're not at the center?
- Curious_Dude
- · Replies 10 ·
Graduate What Is the Difference Between Dusty and Dust-Laden Plasma?
- es.no
- · Replies 2 ·
High School Visual respresentations of topics in Astronomy
- tractiveForce
- · Replies 9 ·
Graduate What Holds the Universe Together?
- oldspice1212
- · Replies 2 ·
Graduate Can Quasars Really Emit Beyond Their Eddington Limit?
- Aziza
- · Replies 3 ·
Undergrad Why Hasn't the Moon Crashed into the Earth?
- Inductor
- · Replies 7 ·
High School How Are Black Holes Formed?
- shounakbhatta
- · Replies 1 ·
Undergrad Could a Planet Thrive with Two Suns?
- baobeiiiii
- · Replies 29 ·
Graduate Could Transient Radio Signals Indicate Extraterrestrial Intelligence?
- Chronos
- · Replies 1 ·
Graduate Quadrupole moment in gravitational waves and LIGO detection
- peacewar1
- · Replies 2 ·
Graduate Effect of negative gravity on time
- Sydney Self
- · Replies 7 ·
High School Is Astrophysics the right course for me?
- M. next
- · Replies 5 ·
Game: Who correctly can guess this astronomical object?
- mkarger
- · Replies 6 ·
Graduate Spacetime Quantization and the Relationship between Energy and Frequency
- johne1618
- · Replies 2 ·
Stargazing Orion SpaceProbe 130 EQ question
- AnTiFreeze3
- · Replies 24 ·
High School Force needed to move a free floating object through space
- Ryan Delaney
- · Replies 7 ·
Graduate Are Brown Dwarfs Part of the Main Sequence on the H-R Diagram?
- ZedCar
- · Replies 5 ·
High School What caused the pressure in the big bang?
- Mohamad&Issa
- · Replies 1 ·