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 CCoronal Mass Ejection Aug 2, 2010: Implications for Earthbound Folks?
- diogenesNY
- · Replies 3 ·
Undergrad Could a Solar Flare destroy life on our planet?
- Silverman
- · Replies 26 ·
Undergrad Velocities of earth's atmosphere, exosphere etc
- luckis11
- · Replies 3 ·
Graduate Inflation is very unlikely less than 10^-6.6×10^7
- emanaly
- · Replies 26 ·
High School Where is the zodiac located in the universe?
- kntsy
- · Replies 19 ·
Graduate Is it possible to determine if space is fixed or moving?
- Emu
- · Replies 39 ·
Graduate Slight confusion with black holes
- zewpals
- · Replies 15 ·
Graduate Can negative mass explain dark matter and dark energy?
- heusdens
- · Replies 2 ·
Graduate If no particles existed at the big bang, how could the universe have temperature?
- Steven Harris
- · Replies 2 ·
Graduate Does the Opaqueness of Space Increase?
- mysearch
- · Replies 3 ·
Stargazing Can We Map Matter Beyond the Visible Universe Using the EPR Sky?
- ClamShell
- · Replies 2 ·
Graduate Density of Atmospheric Gas Using Newtonian Gravity
- ObsessiveMathsFreak
- · Replies 12 ·
Graduate Is Galaxy Expansion Truly Driven by Space Itself or Just Doppler Shifts?
- Kamil Szot
- · Replies 7 ·
Stargazing My Telescope Adventure: Meade LXD75 SN10
- Chronos
- · Replies 10 ·
Stargazing Does cooling a telescope mirror improve image quality?
- russ_watters
- · Replies 11 ·
High School Is There a Center of the Universe?
- RWHITE
- · Replies 4 ·
Graduate What happens to dark matter in galactic collisions?
- Naty1
- · Replies 1 ·
High School How fast would a probe need to travel to reach a star 10 light years away?
- Brett13
- · Replies 16 ·
High School Why Did Ancient Astronomers Believe the Earth Was Round?
- quah13579
- · Replies 1 ·
Graduate Is the big bang the expansion of space itself?
- harroxelas
- · Replies 3 ·
Graduate Playing with Coordinate Systems (Spherical Geometry)
- solarblast
- · Replies 2 ·
High School Do stars actually exist beyond our solar system?
- markjohn82
- · Replies 25 ·
Graduate Modeling Type II supernova collapse to black hole in Maya
- c_worley
- · Replies 1 ·
Graduate Can accretion disks get dense enough to trigger fusion?
- discord73
- · Replies 2 ·
Graduate Not Parallel Universes, Nested Universes
- grey_lightnin
- · Replies 5 ·
Graduate Can an Artificial Satellite Move Opposite in a Geostationary Orbit?
- luckis11
- · Replies 3 ·
Graduate What if the universe is not a bubble, but a sponge?
- Lamented_Soul
- · Replies 8 ·
Graduate I still don't understand why there isn't a center of the universe?
- zeromodz
- · Replies 17 ·
Graduate Planetary Positions according to JPL Data
- Philosophaie
- · Replies 2 ·
Graduate Why does higher redshift with distance imply accelerating expansion?
- DLuckyE
- · Replies 10 ·
Graduate Seeing the milky way in it's past
- Snuka_wut
- · Replies 2 ·
Undergrad If energy can't be created or destroyed, then where did energy come from?
- saln1
- · Replies 1 ·
Graduate How is information conserved in a black hole?
- zeromodz
- · Replies 16 ·
Graduate CMB Power Spectrum and Angular Power Spectrum Plot from WMAP
- TrickyDicky
- · Replies 4 ·
Graduate Is the observable universe is spatially flat?
- TrickyDicky
- · Replies 8 ·
Graduate Can Wormholes Exist in a Flat Universe?
- skydivephil
- · Replies 2 ·
Does the Kuiper Belt surround the entire solar system?
- Brett13
- · Replies 1 ·
Graduate Calculating universe age vs. size of universe
- BrianConlee
- · Replies 4 ·
Could a Subsurface Launched Water Vehicle Create a Tidal Wave?
- Freshtictac
- · Replies 2 ·
Undergrad Why do you stick to the wall when a space station spins around you?
- DARKSYDE
- · Replies 15 ·
Graduate What exactly are Baryon acoustic oscillations?
- TrickyDicky
- · Replies 6 ·
Graduate Precession of the Sun's rotation axis
- natski
- · Replies 2 ·
Graduate Why don't growing planetoids spiral into their star as they gain mass?
- Shubert
- · Replies 53 ·
Undergrad Determining the radius of a star
- travwg33
- · Replies 4 ·
Undergrad Rotating planets and magnetic fields
- very_curious
- · Replies 2 ·
Graduate Why is the age of the universe 13.8 billion years in a particular frame of reference?
- cometraza
- · Replies 12 ·
Graduate Expanding universe and energy question
- fys iks!
- · Replies 3 ·
Why do domains expand in a way that makes each point equivalent?
- FawkesCa
- · Replies 7 ·
Undergrad Big bang, schmig bang: everything's just shrinking
- Namloh2000
- · Replies 43 ·
Graduate What are dyonic black holes?
- charlynd
- · Replies 3 ·
Graduate How could all matter in the universe come from nothing?
- kkapalk
- · Replies 9 ·
Undergrad Send Radio Signals to Other Stars: Accounting for Arrival
- kindaroomy
- · Replies 5 ·
Undergrad Why is our galaxy a disc and not a sphere?
- p h i l
- · Replies 2 ·
Graduate What shape would the Univers be if we could see all of it
- Worzel
- · Replies 2 ·
Undergrad What are the forces on an object in near-Earth orbit?
- Philosophaie
- · Replies 4 ·
Graduate Speed of light in intergalactic space
- foxpoint11
- · Replies 7 ·
High School Would a human be able to see a nebula if they were close enough?
- esvion
- · Replies 5 ·
Undergrad Can we see ancient Earth images via reflected starlight from distant objects?
- LTTTed
- · Replies 3 ·
Graduate Tracking Unstable Elliptical Orbits for College-Educated Scientists
- Philosophaie
- · Replies 2 ·
Graduate Given LQC would a massive black hole undergo inflation?
- rwmp
- · Replies 2 ·
Undergrad Is universe expanding or contracting?
- utkarsh009
- · Replies 7 ·
Most massive star ever discovered
- Naty1
- · Replies 8 ·
Graduate Deriving radial velocity from the Kepler orbit equation
- pc2-brazil
- · Replies 2 ·
Undergrad What produces gravity?
- SaqibAhmed
- · Replies 25 ·
Best month for observing (North East USA)
- Mu naught
- · Replies 1 ·
Graduate Is there a Path for Galaxies Moving Away?
- ranjanbloom
- · Replies 3 ·
Undergrad Pressurization in an enclosed space
- Daimou43
- · Replies 4 ·
Graduate Relative Stargazing: Adjusting Time Distortion for True Representation
- Jellymeat
- · Replies 1 ·
Undergrad Why was the big bang not an explosion?
- astroscott
- · Replies 41 ·
Graduate Could the Universe Repeat Itself Over Infinite Time?
- gravenewworld
- · Replies 66 ·
High School Why is space black?
- kramer733
- · Replies 5 ·
Graduate Do changes of spacetime geometry affect entropy?
- oldman
- · Replies 15 ·
Graduate Are the Various Arrows of Time Correlated?
- ghadir-jafari
- · Replies 8 ·
Graduate Where Does Gravitational Potential Energy Originate?
- david.aloha
- · Replies 1 ·
Graduate New Barrow paper - A New Solution of The Cosmological Constant Problems
- nicksauce
- · Replies 10 ·
Graduate Can a charged black hole exert electromagnetic force?
- RCulling
- · Replies 3 ·
Graduate Is an Expanding Universe Hidden Beyond Black Holes?
- Kat007
- · Replies 32 ·
High School Does the sun actually align with the galactic center every 26,000 years?
- libbon
- · Replies 22 ·
Undergrad Where can I find the actual velocity and position of earth at a specific time?
- TCS
- · Replies 1 ·
Graduate Do galactic magnetospheres relate to black hole mass?
- discord73
- · Replies 1 ·
Undergrad Do galaxies orbit around the center of the Local Group?
- PhanthomJay
- · Replies 14 ·
Graduate How Do You Describe the Motion of Two Bodies Relative to Their Center of Mass?
- pc2-brazil
- · Replies 9 ·
Graduate The Gravitational Effects of Electromagnetic Waves
- Sci1
- · Replies 4 ·
Undergrad Dwarf Stars: Detecting Low-Mass Stars in the Universe
- TrickyDicky
- · Replies 4 ·
Graduate Why We Have Heavy Elements on Earth
- paweld
- · Replies 5 ·
High School Why Do Planets Maintain Distance Despite Gravitational Attraction?
- RoughRoad
- · Replies 5 ·
Graduate Why is the universe shaped like a pebble?
- alice22
- · Replies 9 ·
Graduate Is it possible to use a black hole as a mirror to the past ?
- john.phillip
- · Replies 2 ·
Graduate Why Does Iron Trigger a Supernova in Stars?
- koustov
- · Replies 6 ·
Graduate Red shift, gravity, and dark energy.
- Sci1
- · Replies 5 ·
High School Why don't gaps appear between light rays spreading from distant stars?
- Justin Kirk
- · Replies 18 ·
Graduate My black hole white whole dark matter/energy reversed time theory.
- Charne
- · Replies 1 ·
Graduate How much dark matter is in the Sun, and does it have any
- ensabah6
- · Replies 4 ·
Graduate Standard Candle Dimming Due to Extra Expansion
- BillSaltLake
- · Replies 6 ·
Graduate Can We Model Universes with Different Physical Constants?
- alvarogz
- · Replies 8 ·
High School Why Can't Objects Exceed the Speed of Light in Space?
- travwg33
- · Replies 6 ·
Undergrad A simple algorithm, with no use of the mass, to reproduce the 3 laws of Kepler
- hcl
- · Replies 19 ·
Undergrad What is the significance of the radius where orbital velocity equals light speed?
- travwg33
- · Replies 4 ·
Graduate Accelerated expansion and lightcurves
- TrickyDicky
- · Replies 2 ·
Graduate What is the Origin of the Repelling Force Between Dark Energy and Matter?
- ax3111
- · Replies 23 ·