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 Atmosphere on a hypothetical tidally-locked Earth
- cephron
- · Replies 4 ·
Graduate Has the toroidal universe hypothesis from WMAP data been developed further?
- mathman
- · Replies 16 ·
Graduate What happened to the center of the universe?
- Greylorn
- · Replies 19 ·
Graduate Do nebulae move, and how to predict their positions?
- piareround
- · Replies 7 ·
Graduate Maximum Wind Speeds and Atmosphere Loss on Small Planets
- LKD_
- · Replies 4 ·
Graduate Black Holes Relation to an Accelerated Expanding Universe
- PVastro
- · Replies 12 ·
Human Limitations of understanding.
- shifty88
- · Replies 4 ·
Graduate Does the Spin of a Supermassive Black Hole Influence Its Galaxy's Rotation?
- TRB8985
- · Replies 16 ·
Graduate Shouldn't we have heard alien radio signals by now? Why not?
- SeventhSigma
- · Replies 52 ·
Graduate Why don't astrophysicists discuss the electric currents that create magnetic fields?
- Lesnick
- · Replies 5 ·
Undergrad How Can I Predict When Venus Will Be Visible as an Evening or Morning Star?
- Cantstandit
- · Replies 4 ·
Graduate Surface gravity as a function of luminosity?
- Mr. Bond
- · Replies 4 ·
Graduate Why Does NGC 7603's Bridge Defy Redshift Expectations?
- SeventhSigma
- · Replies 4 ·
Undergrad Does outer space just have two spatial dimensions.
- Dremmer
- · Replies 1 ·
Graduate How Do Scientists Use Zircons to Date the Earth's Formation?
- Wallis
- · Replies 18 ·
Undergrad Phenomenon of rotation of planets
- dpa
- · Replies 9 ·
Graduate Is There Such a Thing as Dark Time?
- geelsu
- · Replies 30 ·
Graduate How can I recognize H alpha line?
- 19matthew89
- · Replies 1 ·
Undergrad Energy Density of a magnetic field
- Macarenses
- · Replies 1 ·
Graduate How does CMB support the predictions of inflation ?
- lalbatros
- · Replies 15 ·
Graduate Do higher-dimensional tori require one dimension smaller than others?
- Vorde
- · Replies 5 ·
High School Could extreme life exist in Venus's acidic atmosphere?
- Vinni
- · Replies 9 ·
Graduate Flatness-infiniteness logical problem
- supermarina
- · Replies 11 ·
Graduate Critical density and observable mass
- jimjohnson
- · Replies 4 ·
Graduate What would happen to black holes if Lambda increased?
- marcus
- · Replies 13 ·
Undergrad Expansion and Contraction of Universe
- vinayjain
- · Replies 30 ·
Undergrad Would modular cargo containers be more efficient than landing a whole cargo vessel?
- Kitchengoblin
- · Replies 17 ·
Graduate Recycling of gas and other materials in galaxies
- H2Bro
- · Replies 1 ·
Graduate The Properties of Jupiter's Core that give it magnetism?
- electron_man
- · Replies 1 ·
Graduate Can Scientists Locate the Center of the Universe?
- nihilius
- · Replies 3 ·
Graduate Liberate all the matter from a black hole
- ugalpha
- · Replies 31 ·
Graduate What is the concept of mass splitting?
- PCSL
- · Replies 12 ·
Graduate A thought experiment regarding the nature of space expansion
- salvestrom
- · Replies 30 ·
Graduate Is space-time flat or curved over time?
- Gill tunnel
- · Replies 7 ·
Undergrad Why Are Giant Stars So Low in Density?
- triabva2003
- · Replies 6 ·
Undergrad Could more planets have habitable zones between hot and cold regions?
- Nigle Amar
- · Replies 10 ·
Graduate Singularity, Infinity, Edge, Expansion
- Flustered
- · Replies 34 ·
High School Do Solar Flares Increase Sunburn Risk?
- tf22raptor
- · Replies 1 ·
High School Layman's question on Cosmic Microwave Background
- FalkonJenova
- · Replies 7 ·
Graduate Why are spiral galaxies generally planar?
- newtonsdad
- · Replies 10 ·
Graduate Why do stars orbit the galactic center at constant velocity?
- Swankie
- · Replies 28 ·
Graduate Units in the Friedmann equation: Lambda, k, and Hubble parameter
- supermarina
- · Replies 6 ·
Graduate How does the tilt and orbit of a planet affect its analemma shape?
- Swankie
- · Replies 1 ·
The Universe - infinite or not ?
- drag
- · Replies 139 ·
Undergrad Can Spider Silk Be Used As Space Tethers?
- geordief
- · Replies 4 ·
Graduate 'A Universe From Nothing' by Lawrence Krauss, AAI 2009
- Schlofster
- · Replies 63 ·
High School Are all celestial bodies falling through space at the same rate?
- cottonkat5
- · Replies 5 ·
Graduate Tidal lock due to rotation of displaced mass
- Dmstifik8ion
- · Replies 1 ·
Undergrad Is astrometeorology a legitimate field of science?
- LightbulbSun
- · Replies 20 ·
Graduate Why Don't Distant Objects Fade to Black?
- mnb96
- · Replies 22 ·
High School Pulsars: fluctuating speed of rotation?
- likewhaaa
- · Replies 2 ·
Undergrad If we see the past, how do we know the universe is still expanding?
- Swimfit
- · Replies 33 ·
Graduate What is the basis for the theory that WIMPs could be detected by
- sahmgeek
- · Replies 6 ·
Undergrad Difference between black holes and wormholes
- eirhnh
- · Replies 23 ·
Undergrad Questions concerning hypervelocity stars
- Travito
- · Replies 9 ·
Stargazing Starting amateur astrophotography with an Olympus SP-550UZ
- Adyssa
- · Replies 3 ·
High School Oxygen, and space what are the effects?
- DubaUe
- · Replies 16 ·
Graduate Dark Matter, Dark Energy, Dark Flow ohh
- rhody
- · Replies 12 ·
High School What is the size of the universe
- jbander
- · Replies 5 ·
Graduate Can expansion be due to large-scale curvature?
- claycravens
- · Replies 3 ·
Graduate How Do Eclipses Affect the B-V Index of Identical Binary Stars?
- Fernsanz
- · Replies 1 ·
High School Proxima Centauri closest star. super nova
- budd
- · Replies 20 ·
Graduate Loss of obliquity on mars and its consequences toward life
- Nano-Passion
- · Replies 4 ·
Undergrad Calculating the period of an orbit
- solarblast
- · Replies 4 ·
Undergrad Why is the universe flat according to the CMB?
- CCosmin
- · Replies 13 ·
Stargazing Your Thoughts on a High Altitude Telescope
- Drakkith
- · Replies 19 ·
Graduate Black hole complementarity and omnipresence
- skydivephil
- · Replies 1 ·
Graduate Fermions in Early Universe: Why We Ignore Them?
- Accidently
- · Replies 3 ·
Undergrad Universe radius 1,000 years ago?
- termina
- · Replies 4 ·
Undergrad Calculating Energy of Separating Stars: Potential vs Kinetic Energy
- zezima1
- · Replies 3 ·
Graduate Into what dimension is Spacetime Curved?
- PhanthomJay
- · Replies 23 ·
High School Can planets revolve without rotating and what determines their orbital direction?
- revelation101
- · Replies 14 ·
Graduate Can neutrinos appear faster than light passing through a gravitational field?
- keepitmoving
- · Replies 10 ·
High School Possible Explanation for Red Flickering of Betelgeuse Star in the Night Sky
- Johnahh
- · Replies 8 ·
Graduate Visualizing Alfven Waves in a Spherical Galaxy
- sparkle123
- · Replies 2 ·
Graduate Does a black hole really have mass?
- Jimmy9
- · Replies 13 ·
Graduate Orbital Elements-Identification of method
- solarblast
- · Replies 3 ·
Undergrad Expanding Universe-Colliding Galaxies?
- Jimmy9
- · Replies 4 ·
Graduate Is there an absolute motionless?
- evangoor
- · Replies 9 ·
Graduate Scanning pattern in Planck's maps
- zonde
- · Replies 4 ·
High School Do stars actually collide in galactic collisions?
- bostonnew
- · Replies 16 ·
Graduate Inflation and accelerated expansion of the universe
- alvarogz
- · Replies 1 ·
Graduate Spacetime expansion effects on wavelength of travelling light
- H2Bro
- · Replies 1 ·
Graduate How Long to Ingest an Earth-Size Planet?
- wolram
- · Replies 6 ·
Undergrad Gravity and space curvature confusion
- ax53
- · Replies 10 ·
Graduate Quantum entanglement and black holes
- bled_eidol
- · Replies 16 ·
Graduate Planetary Systems within Elliptical Binary Stars?
- MrMojo1
- · Replies 3 ·
Graduate What do the processes of first, second and third dredge-up do with a
- eXorikos
- · Replies 2 ·
Cannot see the milky way in dublin?
- gttjohn
- · Replies 15 ·
Graduate Difference between shock waves and blast waves in supernovae
- Jain_Mor
- · Replies 5 ·
High School Time Earth reached its Perihelion
- Philosophaie
- · Replies 5 ·
Graduate Is There Experimental Proof of Dark Energy and Antigravity?
- revelation101
- · Replies 3 ·
Graduate Can a supernova explosion destroy a nearby black hole?
- vinayjain
- · Replies 6 ·
Stargazing New Celestron CPC 925 XLT Telescope Arrives - Dave's Story
- davenn
- · Replies 7 ·
Graduate Ultimate fate of the universe via a Bose-Einstein condensate
- Dale79J
- · Replies 3 ·
Stargazing Go with the Orion Skyview pro 120mm refractor
- BreMatthews
- · Replies 3 ·
Graduate Why is the universe non-uniform if physical laws are the same everywhere?
- thedragonbook
- · Replies 44 ·
Graduate The source of cosmic background radiation
- Lesnick
- · Replies 5 ·
Graduate If the universe is truly expanding, why aren't any stars getting dimmer?
- dcorbett
- · Replies 9 ·
Graduate Deflection of light passing close to the sun
- Lesnick
- · Replies 5 ·