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 Fluctuations of the CMB, symmetry between the hot and cold?
- Spinnor
- · Replies 2 ·
Undergrad What does 250μm-selected galaxies mean?
- Ikaros
- · Replies 2 ·
Undergrad Size of university and Dark Matter
- TenOC
- · Replies 5 ·
Graduate At what distance would binary planets not be tidally locked?
- Hainted
- · Replies 4 ·
Graduate Rate of planets flowing into stars: Discussion
- astrostuart
- · Replies 5 ·
Undergrad What causes planets to become spheres?
- jldibble
- · Replies 8 ·
Graduate Why does the oxygen resonance slow nucleosynthesis but the carbon resonance doesn't?
- thatoekhant
- · Replies 7 ·
Graduate Good books on superclusters and voids?
- whirlpoolm51
- · Replies 1 ·
Undergrad Do Jupiter Trojans Ever Collide with Other Objects in Their Orbit?
- Master Wayne
- · Replies 4 ·
Graduate About radioactive emission by Jupiter
- MonkeyKid
- · Replies 5 ·
Graduate How Do We Know the Universe's Expansion Is Accelerating?
- ViperSRT3g
- · Replies 3 ·
Graduate Thermo/hydro visualization of the Cosmos
- Mordred
- · Replies 4 ·
High School Explanation of Equatorial Coordinate System?
- saidatta123
- · Replies 13 ·
Graduate Magnetic sail using radioactive decay
- udtsith
- · Replies 16 ·
Graduate Why does WIMP scattering cross section decrease in exclusion plots?
- tryhard
- · Replies 1 ·
Undergrad How Can Kepler's Third Law Be Applied to Multi-Object Systems in Visual Python?
- Suiram
- · Replies 5 ·
Undergrad What proof do we have that dark matter exists?
- Manraj singh
- · Replies 28 ·
High School Term for the path of the subsolar point
- snoopies622
- · Replies 4 ·
Graduate Are We Closer to Finding Elusive Gravitational Waves with New Search Methods?
- wolram
- · Replies 3 ·
Graduate Does the mass of a blackhole remain the same if it is not feeding ?
- abbott287
- · Replies 10 ·
Graduate Meaning Of Permeability Of Free Space
- LikesIntuition
- · Replies 20 ·
Undergrad Why do planets orbit in the same plane around the sun?
- clel miller
- · Replies 9 ·
Undergrad Nebulae, as seen from the inside
- Barnak
- · Replies 2 ·
Graduate Saturn's north pole hexagon vortex ring
- Mordred
- · Replies 5 ·
Graduate Spatial infinity and matter-energy density
- TrickyDicky
- · Replies 8 ·
Graduate Initiating mechanism of supernovae
- ChrisVer
- · Replies 12 ·
Graduate Why does time stop in the event horizon of a blackhole?
- Manraj singh
- · Replies 6 ·
High School How the planets get their spherical shape
- lalu
- · Replies 7 ·
Graduate Deriving the Friedmann equation solution for a Lambda-dominated universe
- QuantumX
- · Replies 4 ·
Lenticular Galaxy - Formula for Probable Location of Stars
- leto
- · Replies 20 ·
Undergrad Starting a university club for amateur rocketry and astronomy
- jack476
- · Replies 4 ·
Undergrad How faint can 20/15 vision see from the ISS above the atmosphere?
- chasrob
- · Replies 9 ·
Graduate Astrophysics in a quantum universe
- rustytxrx
- · Replies 4 ·
Undergrad Model to draw an absolute straight line
- Flailan
- · Replies 23 ·
High School Hubble Telescope: What's the Big Flap/Door?
- clel miller
- · Replies 2 ·
Graduate Is the Geometry of the Universe Determined by Its Density?
- Lapidus
- · Replies 5 ·
Undergrad Tesla Coil Thruster: Could it be Possible?
- jack476
- · Replies 4 ·
Graduate Books and articles on M67 cluster dynamics
- kr75
- · Replies 3 ·
Graduate Difference between micro black hole and primordial black hole
- dheeraj
- · Replies 5 ·
Graduate Good reviews about dark matter candidates?
- Casco
- · Replies 2 ·
Undergrad Slow roll inflation -layperson question
- a dull boy
- · Replies 2 ·
Graduate The expansion of the universe, evidence of a 4th spatial dimension?
- pondzo
- · Replies 6 ·
Undergrad Can one object gravitationally captured by another trail indefinitely behind it?
- MickN
- · Replies 1 ·
High School Can someone explain thoroughly the celestial sphere
- medwatt
- · Replies 8 ·
Undergrad Is cosmic microwave background radiation detected outside our galaxy?
- kauffdiggity
- · Replies 1 ·
Undergrad How can space itself move/expand
- FireStorm000
- · Replies 19 ·
Graduate Will Dark Energy Eventually Dominate Dark Matter in the Expanding Universe?
- fsujoseph
- · Replies 12 ·
Graduate Gravity of Dark Matter - matters?
- Clayjay
- · Replies 22 ·
Graduate Could 5-Dimensional Bubbles Explain the Big Bang?
- Mr Peanut
- · Replies 3 ·
Graduate SN1a under fire as standard candles
- Chronos
- · Replies 8 ·
Undergrad How Many Unique Points Exist in a Region of Space?
- Chase
- · Replies 8 ·
Graduate Could spacetime be a condensate?
- ryan albery
- · Replies 13 ·
Graduate Contracting Confusion: black holes and event horizons
- Chronos
- · Replies 1 ·
Stargazing Which Telescope Under $1400 Offers the Best Planetary and Deep Space Viewing?
- themadquark
- · Replies 35 ·
Undergrad What is the scientifically accepted shape of the universe?
- Jarfi
- · Replies 10 ·
Graduate An infinite universe with shape?
- Chase
- · Replies 16 ·
Undergrad Age of the Universe and time duration
- curious bishal
- · Replies 5 ·
Undergrad If the universe expanded from the Big Bang, why is there no centre?
- GreatScot
- · Replies 37 ·
Undergrad No need for complications - Simple clear steps
- Reptile
- · Replies 7 ·
Undergrad Is there red shift evidence for light?
- bartrask
- · Replies 10 ·
High School Red shift of light from galaxies
- Baggins101
- · Replies 11 ·
High School Is the total amount of water on the planet constant?
- DeepCut
- · Replies 15 ·
Graduate Speed of Swallow of a Black Hole
- Nugso
- · Replies 27 ·
Graduate Why Was the Universe Smaller Than a Proton Pre-Big Bang?
- megacal
- · Replies 26 ·
Graduate Does inflation theory have any confirmed predictions?
- acesuv
- · Replies 14 ·
Graduate What's really down in a BH? (a Planck star)
- marcus
- · Replies 14 ·
Graduate Does gravity converting virtual particles to real particles produce radiation?
- Jeet
- · Replies 7 ·
Graduate Galaxy separation faster than the speed of light
- photonkid
- · Replies 9 ·
Graduate Are Ionospheric Scramjets possible?
- Apollo19
- · Replies 3 ·
Undergrad What is the equation of the orbits of things in space?
- MonkeyKid
- · Replies 2 ·
Graduate Thermonuclear fusion in accretion disks?
- soothsayer
- · Replies 6 ·
Undergrad Are there exact temperature and magnitude ranges for stellar classification?
- ckirmser
- · Replies 2 ·
Undergrad When Will the Planets Align Again with Varying Year Lengths?
- caters
- · Replies 9 ·
Graduate Black hole similar to pre universe
- faddishworm
- · Replies 2 ·
Graduate G Magnitude to V magnitude stars in a CCD
- joseamck
- · Replies 5 ·
Supernova in M82 - astrophotographers sought for recent photos
- Integral
- · Replies 18 ·
Graduate Alan Guth thought experiment about negative energy and gravity
- Herbascious J
- · Replies 18 ·
High School Oxygen Needed for Combustion Propulsion in Outer Space
- tonybaloney41
- · Replies 13 ·
Graduate How Does Resonance Affect Satellite Orbits?
- baxter
- · Replies 3 ·
Graduate Can you view objects that moved beyond the event horizon?
- typical guy
- · Replies 7 ·
Graduate Can Superconductors Shield Spacecraft from Cosmic Rays?
- material
- · Replies 1 ·
Graduate What is the temperature of the CMBR?
- photonkid
- · Replies 2 ·
Graduate Is There an ISW Potential During the Matter Dominant Era?
- Mordred
- · Replies 2 ·
Graduate What does the quantum gravity test in arXiv:1401.6562 show?
- skydivephil
- · Replies 6 ·
Graduate What Is the Next Step in Inflation Theory?
- sadraj
- · Replies 11 ·
Graduate How is the Big Bang producing singularity not a black hole?
- John Light
- · Replies 25 ·
Graduate Usage of doppler effect to measure speed of a galaxy
- junfan02
- · Replies 14 ·
Graduate Why does geopotential not take into account the rotation of the Earth?
- baxter
- · Replies 3 ·
Graduate Is Asymptotic Silence in Loop Quantum Cosmology the End of Time?
- skydivephil
- · Replies 3 ·
High School Where Can I Find a Detailed Ecliptic Monitor for Tracking Solar Terms?
- snoopies622
- · Replies 7 ·
Graduate What is the universe expanding into and what caused the big bang?
- Pohan
- · Replies 9 ·
Graduate Is the LCDM Model in Trouble with the BigBOSS Project?
- Chronos
- · Replies 1 ·
Graduate Negative gravitational energy - negative energy gravitons?
- petergreen
- · Replies 4 ·
Graduate Is Spacetime Infinitely Elastic or Does it Have an Elastic Limit?
- EskWIRED
- · Replies 28 ·
Undergrad How we know the universe has a beginning
- yrreg
- · Replies 18 ·
Graduate Is there any evidence for universe still expanding?
- Lok
- · Replies 8 ·
Graduate Local void consistency with Lambda CDM cosmology
- Chronos
- · Replies 3 ·
Graduate Gravitational Lensing: Is He Right or Wrong?
- whirlpoolm51
- · Replies 4 ·
Graduate About completeness of the Friedmann equations
- sergiokapone
- · Replies 8 ·
Graduate Is there a reason to believe there is more matter than anti-matter ?
- xortdsc
- · Replies 10 ·