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
High School Can someone explain what it is meant by a 'Flat Universe'?
- Kiyal
- · Replies 25 ·
Amazing shot of a meteor over Loch Ness
- Greg Bernhardt
- · Replies 6 ·
Graduate Tidal lock and landmass on a Earth-like planet
- Czcibor
- · Replies 1 ·
Graduate How do we know Inflation begin in 10^-35 second?
- Quarlep
- · Replies 3 ·
Meteor trajectories -- Interested in computing them?
- solarblast
- · Replies 4 ·
Graduate Nova in Sagittarius visible from Sydney with camera
- davenn
- · Replies 2 ·
Graduate Water vapor observed venting from Ceres
- marcus
- · Replies 6 ·
Undergrad Giant plume on Mars reaching 250 km altitude in 2012
- Dotini
- · Replies 3 ·
Graduate Could space-time have existed separately before the Big Bang?
- H3TS
- · Replies 6 ·
Graduate Universe shrinking instead of expanding with growing particle masses
- Demystifier
- · Replies 22 ·
Graduate Books similar to Weinberg's The First Three Minutes
- diogenesNY
- · Replies 8 ·
Undergrad What is the evidence for an accelerated expanding universe
- wolram
- · Replies 22 ·
Graduate The Holographic Principle: Separating Fact from Fiction
- Rajkovic
- · Replies 3 ·
Graduate Dark Energy Evolution: Is $\Lambda$CDM Model the Best?
- wolram
- · Replies 1 ·
Undergrad Calculating the distance between the clusters
- CaptCoonoor
- · Replies 5 ·
Graduate Has There Been Further Progress in Shape Dynamics Theory?
- Feeble Wonk
- · Replies 12 ·
Graduate Does the mass in black hole calculations account for dark matter?
- Gerinski
- · Replies 13 ·
Undergrad Could we get to the moon using only classical mechanics?
- mjordan2nd
- · Replies 2 ·
Graduate Reliable Data on Polar Aurora for CERN Experiment
- Frigorifico
- · Replies 6 ·
Graduate What happens to the absorbed mass in a collapsing black hole?
- JustATheory
- · Replies 9 ·
Graduate Calculating the radius of a star's core
- MookVanguard
- · Replies 10 ·
Undergrad Are there gaps between the rays coming from the sun?
- Petahanks
- · Replies 22 ·
Graduate Why is gravity stronger on earth than the moon?
- greg5555
- · Replies 5 ·
Graduate Cosmic expansion in quantum gravity
- palmer eldtrich
- · Replies 12 ·
Graduate Does the Hubble Parameter Go to Zero as the Universe Expands Forever?
- palmer eldtrich
- · Replies 10 ·
Undergrad Apparent Magnitude and Intensity Formula
- thegirl
- · Replies 4 ·
High School How is the radius of the Earth determined?
- elevenb
- · Replies 9 ·
Graduate Do black holes ever form in the observer's reference frame?
- backward
- · Replies 30 ·
Graduate Is it possible that black holes create dark matter/energy?
- Michaelcomputer
- · Replies 2 ·
Undergrad Simulating the Solar System with N-Body Simulation in Java
- Arcthor
- · Replies 12 ·
High School Can We Fly Faster Than a Train?
- abushaheer
- · Replies 5 ·
Undergrad Increase of dark energy with expansion of universe
- Vighnesh Nagpal
- · Replies 57 ·
Graduate Distribution of heavier elements in a planet
- rootone
- · Replies 6 ·
Here are some astrophotos I've taken lately
- scott mcleod jr
- · Replies 17 ·
Graduate Could Quantum Tunneling from Nothing Equate to the Past or Future?
- slatts
- · Replies 4 ·
Undergrad Why are Earth-size Planets candidate as habitable planets?
- ecastro
- · Replies 12 ·
Graduate What does a Cosmological Constant mean?
- TEFLing
- · Replies 11 ·
Graduate Could the expansion of space tear us apart?
- Ghostcrown
- · Replies 9 ·
Undergrad Doubts about nebulae and star formation
- Monsterboy
- · Replies 30 ·
Graduate Dodecahedron universe after PLanck
- palmer eldtrich
- · Replies 13 ·
Graduate Could dark matter form structures like ordinary matter?
- Vighnesh Nagpal
- · Replies 11 ·
Undergrad Is Gravity a well kept secret?
- Orien Rigney
- · Replies 4 ·
Graduate Is MOND still a viable theory for dark matter?
- Chronos
- · Replies 7 ·
Graduate An explanation for hemispherical anisotropy in the CMB?
- Chronos
- · Replies 4 ·
Graduate Would Rapid Expansion of a Parallel Universe Affect a Black Hole?
- Dryson
- · Replies 7 ·
Graduate Ice worlds' inner oceans--Emily Lakdawalla
- marcus
- · Replies 9 ·
Is one lifetime too little to learn all about the Universe?
- DREAMWALKER
- · Replies 11 ·
Graduate Early supermassive black hole 900 million years after the Big Bang
- Tanelorn
- · Replies 47 ·
Graduate Where does the energy of a redshifted photon go?
- Andrev
- · Replies 9 ·
Graduate How does Horava Lifshitz gravity affect the speed of light in bounce solutions?
- palmer eldtrich
- · Replies 6 ·
Graduate Scale of perturbations re entropy, in quantum bounce
- slatts
- · Replies 8 ·
Graduate Is There an Age Problem in the LCDM Cosmological Model?
- wolram
- · Replies 7 ·
Graduate Several questions about the poincare recurrence time?
- dsigler924
- · Replies 5 ·
Graduate Temperature at beginning of Electroweak Epoch?
- Stan Stuchinski
- · Replies 8 ·
Undergrad Why is the universe expanding if its temperature is cooling?
- akashpandey
- · Replies 18 ·
Graduate Why is nothing so underrated in physics research?
- Bob600
- · Replies 1 ·
Undergrad What's the point of building a space elevator?
- 1832vin
- · Replies 5 ·
Graduate Are present and future perspectives different?
- HZY
- · Replies 16 ·
Graduate US 708: Hypervelocity white dwarf ejected by supernova breaks galactic speed record
- liometopum
- · Replies 10 ·
Graduate Does the expansion of the universe affect gravitational forces?
- m_robertson
- · Replies 17 ·
High School What really happened during the Tunguska Event?
- thetexan
- · Replies 8 ·
Graduate Loophole in theory offers insight into the 'lithium problem'
- phyzguy
- · Replies 1 ·
Undergrad Is Ahmed Hulusi's Theory Supported by Science?
- Rajkovic
- · Replies 1 ·
High School Asteroid 99942 Apophis impacting the Earth in 2029
- at94official
- · Replies 57 ·
Bisque Software for Astronomy SkyX
- solarblast
- · Replies 5 ·
Undergrad And now for the latest news from Alpha Centauri
- CygnusX-1
- · Replies 1 ·
Graduate Reticulum 2 - gamma ray emissions
- jim mcnamara
- · Replies 1 ·
Graduate Why can't we make a space elevator using Quantum Levitation?
- Troy Barnes
- · Replies 3 ·
Graduate Wave equation given a cosmological inflationary metric
- Nick2014
- · Replies 4 ·
Who Was the First Woman in Space?
- davenn
- · Replies 2 ·
High School Has the Big Bang theory been disproved?
- BATMANofPHYSICS
- · Replies 3 ·
Graduate Scott Dodelson Modern Cosmology 4.2
- H.fulls
- · Replies 1 ·
Graduate How are quarks measured and what units are used?
- Lobos
- · Replies 27 ·
Graduate Inside Out: The Possibility of White Holes and Black Holes Within Each Other
- BATMANofPHYSICS
- · Replies 3 ·
High School Can a person suspended in space with nothing to push off turn around?
- Spock
- · Replies 6 ·
Graduate The shape of what we can observe?
- Quds Akbar
- · Replies 1 ·
Graduate Other Theorys for the beginning of the Universe?
- Joe Martin
- · Replies 1 ·
Graduate Missing Matter Problem and Galactic Flows
- Michael Faraday
- · Replies 40 ·
Graduate Why can we still detect the CMB ?
- bwana
- · Replies 15 ·
High School What happen when we reach black hole?
- Anand Wilson
- · Replies 3 ·
Graduate Calculating the Age of Planets without Radioactive Dating
- Kelson Adams
- · Replies 7 ·
Graduate Required backround for quantum cosmology
- houhou.trad
- · Replies 15 ·
Graduate How to Calculate Rotation Curves for a Spiral Galaxy?
- zaq
- · Replies 2 ·
Graduate Is there a subtle symmetry that may not apply in an infinite universe?
- Quarlep
- · Replies 7 ·
Graduate Help with the Weber-Davis solar wind model
- JvD
- · Replies 2 ·
Purchasing binoculars for stargazing advice
- cristo
- · Replies 16 ·
Graduate Why must singularities create an entire universe?
- Cadillac Jack
- · Replies 8 ·
High School Confusion regarding Solar Eclipse
- Sanket Jayn
- · Replies 1 ·
Graduate 41430 Arietis Quadruple Star System
- |Glitch|
- · Replies 2 ·
Graduate Why decaying false-vacuum necessary for inflation?
- Lapidus
- · Replies 7 ·
Undergrad Gravitational lensing creates multiple images of the same supernova
- CaptDude
- · Replies 2 ·
Graduate Would dark matter appear dark or invisible to the naked eye?
- Delta2
- · Replies 16 ·
Graduate Calculating Orbital Pathways with Ellipses and Rosettes
- mreuterskiold3
- · Replies 2 ·
Graduate Are all universes the same age in the Multiverse?
- Canada Bob
- · Replies 4 ·
Graduate Cosmological principles and their results
- Quarlep
- · Replies 3 ·
Jupiter's Moons - A Night of Stargazing from Romania
- scotian280
- · Replies 10 ·
Graduate Is the Universe Flat or Closed According to WMAP Data?
- palmer eldtrich
- · Replies 7 ·
Graduate Is C = π x D Possible in a Universe of Nothing?
- richard9678
- · Replies 5 ·
Graduate A noobie questioning the nature of space
- ax0
- · Replies 22 ·
Graduate Closest mass to the line of sight
- center o bass
- · Replies 2 ·