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 Does Age, Mass, and Magnitude Mathematically Relate in Star Clusters?
- randa177
- · Replies 3 ·
Graduate The Observable Universe: Light Travel Time and Distance
- YoungDreamer
- · Replies 4 ·
Graduate What Causes the Increase in Area of Black Hole Horizons?
- schaefera
- · Replies 1 ·
Graduate How do we measure the mass of a star?
- vibram82
- · Replies 7 ·
Graduate Why doesn't dark matter's gravity affect our bodies and solar system?
- MNyberg1020
- · Replies 2 ·
Graduate Skyhook - is this better then space elevator?
- Algr
- · Replies 4 ·
Undergrad How common is it for stars to have rocky bodies orbiting them?
- bostonnew
- · Replies 3 ·
Undergrad How Cepheid variable stars determine distances to galaxies
- gsonnet911
- · Replies 3 ·
Graduate Why aren't these arguments against the big bang widely discussed?
- StarGazer91
- · Replies 9 ·
Undergrad New Star Squirts Water From Poles
- Dotini
- · Replies 5 ·
Undergrad Is big bang 13.7 billion years ago for all observers?
- Singham
- · Replies 15 ·
Earth Not From Same Nebula as Sun. Huh?
- Dotini
- · Replies 7 ·
Undergrad Are blackholes formed in other ways besides supernovas?
- mdmaaz
- · Replies 6 ·
Graduate Could gravity waves reflecting from the universe's edge explain dark energy?
- tkav1980
- · Replies 6 ·
Graduate Does a photon slow down approaching a massive object?
- surajc0504
- · Replies 2 ·
Undergrad How do electrons and protons interact in atoms?
- Jagella
- · Replies 13 ·
Graduate Fully relativistic, cosmological N-body simulations
- matt8282
- · Replies 4 ·
Graduate If the univese is finite will I see my light again.
- tkav1980
- · Replies 2 ·
Undergrad How accurate is this short summary of physics history?
- 92sWoK89
- · Replies 16 ·
Graduate Can Antimatter Universe Follow Physical Laws of Matter Universe?
- Cosmo Novice
- · Replies 3 ·
Graduate Temperature of cold and hot dark matter
- nargesh
- · Replies 1 ·
Undergrad Calculating RA and Dec from long/lat/time/alt/azm
- B-80
- · Replies 1 ·
Graduate Does the empty Milne Universe have a horizon problem?
- johne1618
- · Replies 23 ·
How do you pronounce perilune and apolune
- flyingpig
- · Replies 1 ·
Graduate Dark matter: gamma rays, direct detection, and solar-system tests
- bcrowell
- · Replies 1 ·
Graduate What Explains the Abundance of Matter During the Annihilation Phase?
- Cosmo Novice
- · Replies 1 ·
Graduate Yesterday's Nuclear Decay Related to Today's Flare
- Dotini
- · Replies 8 ·
Undergrad Viewing the beginning of the universe.
- simbiote3
- · Replies 7 ·
Graduate Critical density formula hides fundamental relationship?
- johne1618
- · Replies 4 ·
Graduate Is Our Universe Really Flat or is it Just Euclidean Jargon?
- mtv22
- · Replies 2 ·
Graduate 10 ^18 Amps, Universal Record for Current
- Dotini
- · Replies 3 ·
Graduate Black Hole White Hole in $\Lambda$CDM Cosmology
- wolram
- · Replies 1 ·
Graduate Extremely Advanced Materials from Manipulation of Space-time
- Shaira
- · Replies 18 ·
Graduate Presuppositions of Standard Model?
- skippy1729
- · Replies 4 ·
Stargazing What telescope aperture is needed for spectroscopy of star clusters within MC?
- randa177
- · Replies 10 ·
Graduate Could a Pre-Big Bang Civilization Have Existed?
- Kalantir
- · Replies 6 ·
Undergrad Did the giant impact that formed the Moon affect Earth's position in the solar system?
- YoungDreamer
- · Replies 1 ·
Graduate Does the CMBR have a detectable absorption spectrum?
- JDoolin
- · Replies 8 ·
Graduate Is General Relativity Wrong on Large Scales?
- Dotini
- · Replies 4 ·
Undergrad Would robotic missions to white dwarfs be feasible?
- bostonnew
- · Replies 12 ·
Undergrad What is the case against the theory of cosmic evolution?
- bostonnew
- · Replies 25 ·
Graduate What pushes on the inside of the expanding universe?
- TheIsh
- · Replies 2 ·
Graduate Could the Big Bang resemble a supernova explosion with black holes involved?
- IanBeatbox
- · Replies 3 ·
Graduate Black holes in the early universe
- bcrowell
- · Replies 1 ·
Graduate Star gets torn apart by massive black hole
- AntonL
- · Replies 4 ·
Graduate If there was no space-time before the Big Bang, where did it occur?
- QAZI
- · Replies 15 ·
Graduate What is retrograde planetary perihelion precession?
- magheera
- · Replies 2 ·
High School How Do You Locate Saturn and Jupiter with a Medium Powered Telescope?
- tmoan
- · Replies 3 ·
Does the 2012 winter solstice alignment with the Milky Way cause catastrophic events?
- esmeralda4
- · Replies 8 ·
Graduate Does inflation violate Mach's principle by isolating particles?
- Bob3141592
- · Replies 7 ·
Graduate What Role Did Electrons and Positrons Play in the Early Universe?
- narrator
- · Replies 4 ·
Graduate Is heat death or a bouncing universe the more likely end state?
- wolram
- · Replies 9 ·
Undergrad Big Bang Expansion: Faster than Light?
- Cbray
- · Replies 2 ·
Graduate How does the Earth-Moon system gain energy despite tidal interactions?
- AntonL
- · Replies 8 ·
Stargazing Solar Eclipse - Are we just lucky?
- cramdogs
- · Replies 11 ·
High School Theory of the Universe - 14-Year-Old's Perspective
- Cbray
- · Replies 2 ·
Graduate Black Hole - Questions (discussion)
- Interested In
- · Replies 7 ·
Graduate How much proper time does a photon experience traveling to Aldebaran?
- dotancohen
- · Replies 10 ·
Graduate Accelerating Universe Expansion’s Implications? (layman’s questions)
- shawn-m
- · Replies 6 ·
Graduate Is the Heat Death of the Universe Inevitable and What Can We Do About It?
- Delong
- · Replies 35 ·
Graduate Plot of energy against space-time
- axiomatical
- · Replies 4 ·
High School How would I measure the angle of a certain street from true north?
- Ironside
- · Replies 9 ·
Graduate What is there actually to say of wormholes at the moment?
- TubbaBlubba
- · Replies 11 ·
Model of the universe/s, multiverse's etc (just a thought nothing more )
- great_sushi
- · Replies 3 ·
Undergrad Star Swallowed by Galactic Black Hole
- RJ Emery
- · Replies 4 ·
Graduate Will the Expanding Universe Eventually Become Invisible?
- Whateverworks
- · Replies 3 ·
High School When is Saturn visible in the sky and how do I find it with a telescope?
- Eats Dirt
- · Replies 5 ·
Graduate Why was the STEP mission canceled and are similar missions planned?
- jumpjack
- · Replies 1 ·
Graduate Positions on possible parallel universe theory
- R=2GM/c^2
- · Replies 1 ·
Graduate Evolution of Elementary particles?
- Aztral
- · Replies 2 ·
Graduate Does the speed of light change if?
- lawnmower man
- · Replies 17 ·
Graduate Would a Neutron Star Stop a Neutrino?
- Islam Hassan
- · Replies 20 ·
Graduate Why are Andromeda and the Milky Way approaching each other?
- Endervhar
- · Replies 16 ·
Undergrad How are Cepheids used to measure distances?
- Mooky
- · Replies 5 ·
Undergrad Can we identify the generation of any star?
- bostonnew
- · Replies 1 ·
High School Which eyepiece for my 1100mm f/120 reflector telescope?
- cas888
- · Replies 1 ·
Graduate Is the Sun Going Through a Period of Weakening?
- Dotini
- · Replies 2 ·
Undergrad How Do We Calculate the Gravity of Different Particles and Celestial Bodies?
- mvan4310
- · Replies 5 ·
Graduate Neutron Star to Black Hole Via OMG?
- Islam Hassan
- · Replies 8 ·
Undergrad Stefans Boltzmann Law: Find Star Luminosity
- shugar37
- · Replies 2 ·
Graduate Where do successive star generations get hydrogen from?
- ExNihilo
- · Replies 10 ·
Graduate Rate and direction of expansion of the universe
- asimov42
- · Replies 6 ·
Help choosing a physics project
- usha
- · Replies 3 ·
Undergrad Temperature - Effect on atmospheric pressure.
- ExcessRed
- · Replies 13 ·
Graduate What is the evidence on Big Bang versus steady state cosmologies?
- Greg Bernhardt
- · Replies 1 ·
Graduate What is CMB rest?
- Greg Bernhardt
- · Replies 1 ·
Graduate Black Hole Mass Flows: Is the Balance 0%?
- Islam Hassan
- · Replies 3 ·
Undergrad What is the significance of hour angle in astronomical observations?
- randa177
- · Replies 5 ·
Graduate Gravitational perturbations = tidal forces?
- Deadstar
- · Replies 1 ·
Graduate Is the universe entirely predictable, or is it based in probability?
- Sylickon
- · Replies 10 ·
Undergrad Are Black Holes Hot? A Deeper Look
- Cbray
- · Replies 5 ·
Graduate Did Gravity Exist Before the Big Bang?
- Sylickon
- · Replies 8 ·
Undergrad Planet orbital location database
- krsbuilt
- · Replies 5 ·
Graduate Is the Universe Based on a Simple Binary Code?
- lowing99
- · Replies 2 ·
Graduate Can Black Holes be Propelled by Ion Engines?
- cph
- · Replies 5 ·
Undergrad What happens when a second mars appears?
- Sp33df0rc3
- · Replies 4 ·
High School Spectacular solar eruption 7 june 2011
- AntonL
- · Replies 8 ·
Graduate How can you define time elapsed from the Big Bang if time is local?
- Chewz
- · Replies 1 ·
Graduate Possible non-existence of black holes and its consequences
- stephenwlin
- · Replies 9 ·
Graduate Fate of Universe: Intelligent Species Impact
- Hyperspace2
- · Replies 2 ·