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 How are the Casimir Effect, Vacuum Energy, Inflation, and Dark Energy Connected?
- oldman
- · Replies 9 ·
Undergrad Just a question of planetary magnetism
- ChongFire
- · Replies 1 ·
Graduate Does the bending of light by objects affect our view of the universe as a whole?
- n0vadeath
- · Replies 4 ·
High School Has a galaxy ever split into two separate galaxies?
- sunblock
- · Replies 8 ·
Graduate Is the Multiverse Theory More Plausible Than Inflationary or Ekpyrotic Models?
- Vast
- · Replies 16 ·
Graduate Why can't we see light from black holes if gravity and light travel at the same speed?
- LEIN_AD
- · Replies 5 ·
Graduate Blackholes theory maybe incorrect?
- vincentm
- · Replies 10 ·
High School What Are Some Questions About the Universe That a Newbie May Have?
- n0vadeath
- · Replies 7 ·
Rooting for Roaches in Space: Madagascar Hissing Roaches Thrive in Vacuum
- ZapperZ
- · Replies 3 ·
Stargazing Buying a telescope any suggestions?
- Opatik
- · Replies 12 ·
Graduate Universe might be older and bigger
- vincentm
- · Replies 1 ·
Graduate Ultimate configuration of a flat universe
- Loren Booda
- · Replies 1 ·
Graduate Where Does '13.7 Billion' Come From?
- Dorje
- · Replies 3 ·
Graduate Is Planck's Constant Constant, or Does it Vary Through Spacetime?
- Pademelon
- · Replies 2 ·
What Would Watching TV on the Moon or in Deep Space Look Like?
- skywolf
- · Replies 6 ·
Undergrad Phases of the Moon: Angular Separation Question
- kepler
- · Replies 2 ·
Graduate Collection of known scientists that are beyond the standard model
- wolram
- · Replies 1 ·
Graduate Does the 2nd Law of Thermodynamics Apply to Entropy in a Big Crunch?
- Criticalmass
- · Replies 7 ·
Undergrad Final Year Project Ideas: Astronomy with a Celestron Telescope
- Cyclotron
- · Replies 3 ·
Graduate What are the latest exciting results from WMAP's three-year data release?
- SpaceTiger
- · Replies 80 ·
Graduate Could galactic redshift be from orbital motion rather than expansion?
- shanu_bhaiya
- · Replies 55 ·
Graduate Binary Planemos Challenge Traditional Views on Planet and Star Formation
- Orion1
- · Replies 1 ·
Is Barbara Ryden's Cosmology book worth buying?
- Ratzinger
- · Replies 6 ·
Graduate Have dark energy and dark matter percentages changed since the big bang?
- CosmologyHobbyist
- · Replies 8 ·
Undergrad How Does Weight and Thrust Affect Rocket Acceleration and Velocity?
- Labguy
- · Replies 3 ·
Undergrad C11-SGT vs CPC 1100 GPS: which Celestron 11" mount is better?
- Cyclotron
- · Replies 14 ·
Graduate Definition of Volume Limited Sample for Sky Surveys
- Zaphodx57x
- · Replies 1 ·
Graduate Calculating Solar Core Radius Using Emden's Equation
- Helios
- · Replies 4 ·
High School Are Stars Really Formed by Black Holes?
- superweirdo
- · Replies 21 ·
Graduate Do cosmologists understand what drives the inflaton and gravitational fields?
- oldman
- · Replies 12 ·
Undergrad Position of Earth in the Universe
- Born2Perform
- · Replies 50 ·
Graduate How do we detect and study dark matter in our universe?
- wolram
- · Replies 4 ·
Graduate Different laws after a big crunch/big bang
- pete5383
- · Replies 2 ·
Graduate Can a body at a Lagrange point affect Earth's tides and create new Lagrange points?
- star.torturer
- · Replies 4 ·
Graduate Is the Accelerated Expansion of the Universe Misunderstood?
- daniel_i_l
- · Replies 34 ·
Graduate What is the purpose of the entire infinite universe?
- Psykostx
- · Replies 2 ·
Time Travel Yeah I know maybe some parallel universe talk too
- Quantum1332
- · Replies 20 ·
Undergrad Why do black holes emit X-rays if light cannot escape?
- blumfeld0
- · Replies 5 ·
Graduate Sachs-Wolfe effect and dark energy
- Chronos
- · Replies 2 ·
High School Imagine to be Pluto's surface, climate and atmosphere?
- zeus.hellas
- · Replies 11 ·
Undergrad How quasars are related to black holes in galaxies?
- blumfeld0
- · Replies 9 ·
Undergrad Big Bang Theory: Can Universe Expand Faster than Light?
- Dawguard
- · Replies 3 ·
Graduate Entropy, information and Omphalos cosmology
- oldman
- · Replies 21 ·
Graduate Questions about supermassive black holes and jets
- superweirdo
- · Replies 13 ·
Graduate What Basis Supports the Theory of an Expanding Universe?
- MeJennifer
- · Replies 16 ·
Undergrad Why do Spectroscopic Binaries Have Short Periods?
- blumfeld0
- · Replies 4 ·
Graduate What is the current consensus on 7Li abundances and key research papers?
- Kea
- · Replies 3 ·
Graduate How can an infinite universe begin with a finite singularity?
- Jenny
- · Replies 2 ·
High School South Delta Aquarid or Perseids?
- pete5383
- · Replies 3 ·
Graduate Observing a Body at z=6: Calculating Photon Requirements
- wolram
- · Replies 3 ·
Graduate Is the curvature of the universe affected by dark energy and if so, how?
- kmarinas86
- · Replies 6 ·
Finding the Visyar bright star catalogue
- Soilwork
- · Replies 4 ·
Graduate Black holes and the expanding universe
- oldman
- · Replies 4 ·
Is traveling important for astronomers?
- alias25
- · Replies 4 ·
Graduate Planck - stelactic - cosmological black hole symmetry?
- Loren Booda
- · Replies 3 ·
Undergrad Sudden ceasing of energy generation
- blumfeld0
- · Replies 3 ·
What is a spiral tracer and what are its characteristics?
- blumfeld0
- · Replies 1 ·
Graduate Question on the expansion of space
- PhysicsDilettante
- · Replies 1 ·
Graduate How Deeply Can We See Into the Sun?
- blumfeld0
- · Replies 1 ·
Graduate No Redshift from Distant Galaxies: Implications for Universe
- blumfeld0
- · Replies 3 ·
Undergrad Fusion of Stars: Time Difference for 0.50 & 1.5 Msolar Stars
- blumfeld0
- · Replies 1 ·
Graduate Thiemann's approach to the problem of time in general relativity
- selfAdjoint
- · Replies 4 ·
Undergrad Gravity on the surface of the Moon
- waterhouse
- · Replies 4 ·
Graduate Objects faster than light because space is expanding
- MeJennifer
- · Replies 13 ·
Graduate How many M type stars equal the luminosity of one O type star?
- blumfeld0
- · Replies 3 ·
Undergrad If Mars had 25% more mass would its orbit be further or closer to the sun?
- Thor
- · Replies 28 ·
Graduate Theories without the use of cosmological principle.
- MathematicalPhysicist
- · Replies 1 ·
Did time run slower in the early universe?
- SizarieldoR
- · Replies 17 ·
Graduate Is Every Galaxy the Center of the Universe?
- Vogue
- · Replies 55 ·
High School What is the density of the Sun's surface?
- DaveC426913
- · Replies 8 ·
High School How do these triangular toothpick ion engines lift off the ground?
- Arian
- · Replies 1 ·
Graduate What is singularity in black holes?
- AMD_K8L
- · Replies 24 ·
Why Haven't We Returned to the Moon in Decades?
- MeJennifer
- · Replies 11 ·
Graduate Is an infinite universe with pocket universes mainstream cosmology?
- revelshade
- · Replies 6 ·
Undergrad Does Juggling Follow Kepler's 2nd Law?
- DaveC426913
- · Replies 8 ·
Graduate Large number coincidence and scaling laws in cosmology
- wolram
- · Replies 1 ·
Graduate The cosmological principle in simple models of the universe
- Eric England
- · Replies 10 ·
Graduate Matter and space-time mutually exclusive?
- Jonny_trigonometry
- · Replies 5 ·
Graduate Does omega measure only the observable universe's geometry?
- blumfeld0
- · Replies 2 ·
Graduate Amount of Matter in the Universe
- loseyourname
- · Replies 12 ·
Undergrad Age of the sun in galactic years
- Vogue
- · Replies 10 ·
High School What Would Happen if We Tried to Pull the Moon Closer to Earth?
- Quadruple Bypass
- · Replies 28 ·
Graduate Is Our Universe Flat or Embedded on a Singularity?
- Ganzfeld
- · Replies 9 ·
Undergrad Seeking astrophysics consultant for Mars-based sci-fi series
- novasatori
- · Replies 1 ·
Graduate Is there an Age Problem in the Mainstream Model?
- Garth
- · Replies 22 ·
High School Why does Venus orbit the sun in the opposite direction?
- EMAAN
- · Replies 10 ·
Graduate Accelerating Universe: Experiments, Acceptance & Implications
- Chen
- · Replies 15 ·
Graduate Strangeness Nuggets to Strangeness Condensation
- Chronos
- · Replies 40 ·
Graduate Scale-related mass density and cosmological problems in universes with energy conservation
- wolram
- · Replies 7 ·
Graduate Could black holes be the creators of galaxies?
- ChongFire
- · Replies 3 ·
Graduate Hyperbolic structures in the universe
- Loren Booda
- · Replies 4 ·
Undergrad Experiments that modeled blackholes
- daniel_i_l
- · Replies 1 ·
High School What Did Ancient Civilizations Discover About the Universe Before 3000 BC?
- dansydney
- · Replies 6 ·
High School How did scientists first estimate Earth's mass?
- argonurbawono
- · Replies 2 ·
A couple of free books to download
- Azael
- · Replies 3 ·
Graduate Cataclysmic Variables spin rates
- toph
- · Replies 2 ·
High School Did the Black Hole in Superman Returns Resemble a Type Ia Supernova?
- kxtreme
- · Replies 2 ·
Graduate Can Hawking radiation particles explain dark matter?
- alias25
- · Replies 5 ·
Graduate Spawn of black hole thought experiment
- Instine
- · Replies 5 ·
Undergrad How do you imagine a finite universe?
- wolram
- · Replies 71 ·