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 Beginning of accelerating expansion
- hendoS
- · Replies 3 ·
Graduate Missing low-metalicity Red Dwarves
- RCopernicus
- · Replies 1 ·
Graduate Why is temperature inversely proportional to the horizon's area?
- David Carroll
- · Replies 7 ·
Graduate How did massive black holes form and grow in the early universe?
- wolram
- · Replies 16 ·
Undergrad Could Super-Bacteria from Space Pose a Threat to Earth?
- Dryson
- · Replies 1 ·
Undergrad Gravitational Lens with home scope?
- mishima
- · Replies 2 ·
Graduate Early universe critical density and the inference of dark matter
- gianeshwar
- · Replies 6 ·
Graduate Where can I find an updated Milky Way density profile for my simulation?
- RCopernicus
- · Replies 4 ·
Graduate Who should we give credit for considering the possibility of Black Hole?
- avito009
- · Replies 6 ·
Graduate Does infinite regress prove the universe must be infinite?
- iDimension
- · Replies 40 ·
Graduate How far from Event horizon are you safe?
- avito009
- · Replies 7 ·
Graduate Is hyperbolic space consistent with homogeneity?
- center o bass
- · Replies 4 ·
Graduate Why is stellar ash found in the core of a White Dwarf so dense?
- avito009
- · Replies 2 ·
Graduate The fabric of the cosmos - Universe or Multiverse
- benlahbib
- · Replies 2 ·
Graduate How can black holes coexist with the expanding universe?
- Grajek
- · Replies 22 ·
Graduate Gravity and Gas Pressure on an Accelerating Object
- Dryson
- · Replies 2 ·
Graduate Can another black hole pull you out of an event horizon?
- maa105
- · Replies 34 ·
Graduate Horizon distance at last scattering surface
- Orodruin
- · Replies 6 ·
Graduate Spiral Galaxies as Gravity Lense
- RCopernicus
- · Replies 3 ·
Graduate Explore Laniakea: The Supercluster Earth is in
- Astronuc
- · Replies 1 ·
Undergrad How does solar wind effects Geomagnetic Field?
- space0
- · Replies 5 ·
Stargazing UY Scuti, the biggest known star, viewed through a telescope
- Haktarfone
- · Replies 6 ·
Undergrad Oldest part of the galaxy that could have held life?
- cbrons
- · Replies 1 ·
Graduate Inhabitable planets at doable distances ever or somewhere?
- Gerinski
- · Replies 21 ·
Graduate Does empty space contain energy and how can nothing be warped?
- iDimension
- · Replies 2 ·
Graduate Carbon based Life vs. Plasma based Life.
- jeremyjr
- · Replies 6 ·
Graduate Rethinking the origins of the universe
- Shadowmaru
- · Replies 3 ·
Graduate What happens beyond 13,7 billion light-years?
- Jozsef
- · Replies 15 ·
Graduate Finding MK5 and BD-HD to constellation designation cross-references
- Philosophaie
- · Replies 1 ·
Graduate Dark energy: is it just "lost" light?
- Alessio P.
- · Replies 2 ·
Graduate Where is the future if everywhere is the past?
- iDimension
- · Replies 11 ·
Undergrad Detecting more than 1 exoplanet using Radial Velocity Method.
- avito009
- · Replies 4 ·
Graduate How does the unobservable universe affect the calculated age of the universe?
- menniandscience
- · Replies 13 ·
Graduate The Cosmological Constant with Inflation is not Constant
- the_pulp
- · Replies 5 ·
Graduate Analysis: Why BICEP2 & PLAnck Are in Tension
- skydivephil
- · Replies 17 ·
Graduate Deriving the rayleigh-jeans limit of planck law of radiation
- Jonsson
- · Replies 1 ·
Graduate Helium formation during nucleosynthesis
- Yashbhatt
- · Replies 2 ·
Undergrad Gravitational pull of manmade satellites
- Vruchtgebruik
- · Replies 4 ·
Graduate Meteoritical History of the Solar System
- connorp
- · Replies 3 ·
Stargazing Mirror Mounting Structure in Space Telescope
- D.R.U
- · Replies 1 ·
Graduate How Do Neutrinos Carry So Much Energy in Supernova Explosions?
- anorlunda
- · Replies 11 ·
Undergrad Understanding Redshift: Mathias' 15-Year-Old Query
- MathiasArendru
- · Replies 1 ·
Graduate Proof That Universe Can Form Spontaneously From Nothingness
- Violet Keil
- · Replies 2 ·
Graduate Are Redshifts Used to Specify Locations in Cosmology?
- center o bass
- · Replies 7 ·
Graduate Is our universe inside a blackhole?
- Haktarfone
- · Replies 14 ·
Graduate Can an eccentric planet be habitable?
- willstaruss22
- · Replies 15 ·
Graduate What happens when an antimatter black hole collides with a normal black hole?
- guysensei1
- · Replies 17 ·
Graduate If the earth's core was to abruptly turn solid
- Mr.CROWLER
- · Replies 15 ·
Extraterrestrial life discovered in outer space
- StevieTNZ
- · Replies 4 ·
Undergrad Calculation the orbital period of Moon.
- avito009
- · Replies 2 ·
Undergrad How light travels such long distances?
- Mohammad Hadi
- · Replies 12 ·
Graduate Multipole Map with Healpix routines
- physfed
- · Replies 2 ·
Graduate Physical infinities, what are the limitations?
- iDimension
- · Replies 17 ·
Graduate Is Planck Dust Modeling Consistent with BICEP2 Assumptions?
- Chronos
- · Replies 2 ·
Graduate Why does the galaxy LEDA 074886 appear rectangular?
- !Jon Snow!
- · Replies 2 ·
Graduate Why is the Universe Expanding and Not Contracting?
- lu214
- · Replies 13 ·
Graduate Neutron Star at Near Light Speed
- wmikewells
- · Replies 6 ·
High School How to Improve Your 8th Grade Paper on the Collision of Two Galaxies?
- c-english
- · Replies 6 ·
Graduate Black holes and the centrifugal force paradox
- joebox
- · Replies 5 ·
Graduate Questions re: the edge of the observable universe
- Zeno
- · Replies 4 ·
Undergrad List of Stars and Objects equating Names
- Philosophaie
- · Replies 3 ·
Graduate How Did The CCCP See Past Venus' Clouds Prior to Landing?
- MattRob
- · Replies 5 ·
Graduate Why does interstellar dust scale with metallicity?
- xn_axe
- · Replies 7 ·
Graduate Time derivative of Hubble parameter
- Lapidus
- · Replies 1 ·
Graduate Primodial power spectrum of scalar perturbations
- thecommexokid
- · Replies 2 ·
Graduate Why Does Gravity Around a Black Hole Remain Normal Until Extremely Close?
- avito009
- · Replies 2 ·
Graduate Why does spatial curvature become observable only in late universe?
- Lapidus
- · Replies 14 ·
Graduate Infinity and mathematical phyisics
- Pjpic
- · Replies 6 ·
Undergrad Why is 1/2Iω² not the kinetic energy of a planet in elliptical orbit?
- Parto0o
- · Replies 4 ·
Graduate Mathematical Analysis on Cold Dark Matter
- xn_axe
- · Replies 1 ·
Solar flare video with exceptional detail
- davenn
- · Replies 19 ·
Graduate Fluctuations of density in De Sitter Space
- Gars
- · Replies 1 ·
Graduate Converting 1/(Hubble time) to km/s per Mpc
- marcus
- · Replies 14 ·
Graduate How Can the Distance Between Two Points Exceed the Size of the Universe?
- LoudAmp
- · Replies 8 ·
Graduate What is a flux limited sample and why use it?
- venkatpunjabi
- · Replies 2 ·
Graduate Why is the universe expanding at an accelerating rate?
- Domenico94
- · Replies 10 ·
Graduate Thanks for any thoughts,Could Black Holes Pump Energy into the Quantum Foam?
- Gizmo
- · Replies 6 ·
Graduate I'm new this -- super force splitting into weak and strong forces?
- Mr.CROWLER
- · Replies 9 ·
High School Is There Really a Second Sun in Our Solar System?
- Ibby143
- · Replies 10 ·
High School Questions about my stratosphere photos
- avidemux
- · Replies 6 ·
Graduate Hawking power times evaporation time yields unexpected energy result
- liometopum
- · Replies 2 ·
Graduate Looking Again at the Balloon Analogy
- liometopum
- · Replies 34 ·
Graduate Could the Universe Be Expanding as Wave Fronts?
- marlowgs
- · Replies 2 ·
Graduate Expanding space thru matter vs matter thru space
- awcrowe
- · Replies 7 ·
Stargazing Buying a Telescope: First-Time Advice
- nick1o2
- · Replies 3 ·
Graduate How does comoving matter keep pace with accelerating space?
- yogi
- · Replies 14 ·
Why haven't we gone back to the moon?
- DruidArmy
- · Replies 51 ·
Graduate Questions about the universe I resolving.
- Silvers931
- · Replies 1 ·
Graduate Event horizon ad the age of our universe
- Erland
- · Replies 9 ·
Undergrad Universe is expanding like a balloon
- Aontaigh
- · Replies 6 ·
Undergrad Does Gravity Have Lines of Force Like Magnetism?
- DOCK1088
- · Replies 16 ·
Undergrad How Do Scientists Distinguish Between Red Shift and a Red Dwarf's Natural Color?
- Ibby143
- · Replies 2 ·
Graduate What is the evidence for the multiverse?
- bluemoonKY
- · Replies 39 ·
Undergrad University project for astrophysics
- tinyman
- · Replies 1 ·
Graduate Why does the amount of dark matter increase the further away from the
- sytric
- · Replies 6 ·
Graduate Is Supersymmetry still viable in cosmology?
- wolram
- · Replies 6 ·
August 18 - Conjunction of Venus and Jupiter
- Greg Bernhardt
- · Replies 6 ·
Graduate Big Bang : Singularity or Singularities?
- Jozsef
- · Replies 5 ·
Laniakea: Our home supercluster (video)
- Fredrik
- · Replies 1 ·
Holy Close Call Batman, asteroid 2014 RC
- Creator
- · Replies 5 ·