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 Origin of Electrons: Big Bang & Annihilation
- mathman
- · Replies 18 ·
Graduate What Would You See at the Threshold of the Expanding Universe?
- Wazkick3n
- · Replies 15 ·
High School Do Stars Flicker Colour & Intensity in the Night Sky?
- dacruick
- · Replies 5 ·
Graduate Expansion of the Universe question
- Angry Citizen
- · Replies 57 ·
Graduate Molecular Cloud Clumping Question
- Vorde
- · Replies 6 ·
Graduate Could Black Holes Be Collapsed Dimensions Rather Than Massive Gravity Events?
- edsousaphone
- · Replies 1 ·
Undergrad [QUESTION]Dark energy could it be an explosion?
- Harry Gillman
- · Replies 5 ·
Graduate [Question] What would happen if gravity were removed?
- MemoryLapse
- · Replies 28 ·
Graduate Does space-time form a closed manifold around a black hole?
- Imax
- · Replies 10 ·
Is There a Correct Way to View the Universe?
- MartinJH
- · Replies 4 ·
Graduate Argument against the existence of black holes?
- diewlasing
- · Replies 17 ·
Undergrad Will the Moon's Recession from Earth Ever Cease?
- Studious_stud
- · Replies 1 ·
Graduate Very targeted question on multiple universes hypotheses
- phinds
- · Replies 2 ·
Graduate Vacuum Metastability: Estimating the Lifespan of a False Vacuum”
- physics9c
- · Replies 15 ·
Graduate What does tidal gravity feel like?
- FtlIsAwesome
- · Replies 11 ·
Graduate If the universe were sparked again
- 1MileCrash
- · Replies 6 ·
Graduate How does inflation drive omega close to 1?
- j9500
- · Replies 3 ·
High School Float & Fly Freely: Differentiating Space & Earth
- karawan
- · Replies 1 ·
Planet positions and gravitational effects
- Akfine
- · Replies 3 ·
Graduate Separation of Multiple Universes?
- BoltzmanBrain
- · Replies 10 ·
Graduate Is Gravity Truly Omnipresent and Can It Exist Without Mass?
- Jake Minneman
- · Replies 3 ·
Graduate Is Time Truly the Fourth Dimension in Spacetime?
- Museigen
- · Replies 20 ·
Graduate Gravitational Red Shift at the center of a mass
- j bramblejam
- · Replies 1 ·
Graduate Primordial Black Hole as nucleus for gravitic atom
- matmos101
- · Replies 11 ·
Graduate Are Hot Jupiters in Stable Orbital Resonance?
- cph
- · Replies 4 ·
Graduate Unraveling the Mystery of the Sun's Composition and the Fate of Matter Within
- moejoe15
- · Replies 4 ·
Graduate How Much Potassium Nitrate is Needed to Propel a 10 kg Rocket into Orbit?
- Guywithstick
- · Replies 3 ·
Undergrad Can We See All Galaxies in the Universe?
- karl22
- · Replies 17 ·
Good wallpaper pics of our red sun from earth
- bugatti79
- · Replies 7 ·
Undergrad Question about the color of galaxies & nebulae
- phinds
- · Replies 19 ·
Graduate Determine body properties by visual spectrum?
- bhoom
- · Replies 4 ·
Graduate Extracting Energy from Cosmic Expansion
- Shovel
- · Replies 4 ·
Graduate What is the most detailed analysis of the very early universe?
- ficodr
- · Replies 16 ·
Stargazing Muon Telescope: The Universe's Secrets
- LKD_
- · Replies 4 ·
Undergrad Elliptical Orbit: Determine Foci & Missile Path
- llandau
- · Replies 2 ·
High School Are There Any Other Educational Video Series Like 'The Mechanical Universe'?
- kraphysics
- · Replies 4 ·
Undergrad The orbital eccentricity change of the Earth ?
- Bjarne
- · Replies 5 ·
Graduate Learning Basics of Stellar Modelling
- jon
- · Replies 8 ·
Graduate Could Vacuum Energy Be the Key to Understanding Dark Energy?
- scottbekerham
- · Replies 75 ·
Who's the Top Expert in Black Hole & Time Travel Theories?
- SunnyCA
- · Replies 10 ·
I need someone who knows what nebulae look like well to look at these
- rollcast
- · Replies 3 ·
Graduate Intrinsic Redshift: Current Status and Research
- lavinia
- · Replies 9 ·
Graduate Habitable exoplanets of white dwarfs
- FtlIsAwesome
- · Replies 5 ·
Graduate Lone wolf planets able to support subglacial ocean life?
- marcus
- · Replies 18 ·
Graduate Mass Dispersion of Observable Universe
- tamousfleck
- · Replies 4 ·
High School Recent Supernova Sightings: Dates, Times, and Visibility
- Darken-Sol
- · Replies 2 ·
Graduate Low mass post-main-sequence on HR diagram
- Zorba
- · Replies 6 ·
Graduate A problem from Binney and Tremaine
- krishna mohan
- · Replies 2 ·
Graduate Decreasing entropy of the universe
- cansay27
- · Replies 3 ·
Graduate What Happens When a Wormhole Ends Inside a Black Hole?
- athv_gr
- · Replies 12 ·
A photon and a neutrino go into a bar
- Subluminal
- · Replies 20 ·
Graduate Before the big bang the entire universe must have been a black hole.
- mdmaaz
- · Replies 11 ·
Undergrad Practical Cosmology: Examples of How it Helps Our Ventures
- narrator
- · Replies 3 ·
Graduate Galactic angular velocity of interstellar cloud
- bmace
- · Replies 1 ·
High School Why do comets tails come out of the front and curve around to the back?
- Cbray
- · Replies 2 ·
Graduate Is Infinity Plausible in the Universe?
- Lightning-Rod
- · Replies 4 ·
Novice Astrophotographer Discovers Supernova
- russ_watters
- · Replies 17 ·
Laser pointer for start viewing: something affordable?
- dotancohen
- · Replies 13 ·
Graduate Creating a MMO in the Universe: Spacetime Online
- Willis666
- · Replies 10 ·
Undergrad Could the Laws of Physics Change in a Universe with Different Matter Density?
- h1ghf1ve
- · Replies 18 ·
Graduate Were the First Stars in the Universe Fast Spinners?
- JaredJames
- · Replies 2 ·
Undergrad How can you discover new things in Astronomy without a PhD ?
- nukeman
- · Replies 8 ·
Graduate Does light speed vary in different gravitational situations?
- narrator
- · Replies 4 ·
Graduate Black Holes and Wormholes: Fact or Fiction?
- narrator
- · Replies 7 ·
Graduate Wiltshire's Timescape model been refuted?
- Jorrie
- · Replies 11 ·
Graduate How to Calculate the Heat Received by Newly Discovered Extrasolar Planets?
- gabe69
- · Replies 1 ·
Graduate Is the edge of our universe within our reach?
- unknownperson
- · Replies 22 ·
Undergrad Would enough inert rock clumped together form a black hole ?
- phinds
- · Replies 14 ·
Undergrad Acceleration in elliptical orbits ?
- Bjarne
- · Replies 3 ·
Graduate Looking for reading material on extrasolar planet detection
- Deadstar
- · Replies 3 ·
Graduate Expansion of space (conceptual question)
- Elwin.Martin
- · Replies 7 ·
High School Does moving at high speeds actually slow down time?
- athrax
- · Replies 8 ·
Graduate Project in cosmology or theoretical particle physics ?
- sam_021
- · Replies 4 ·
Graduate Meteor radiant angle. Is this computation right?
- solarblast
- · Replies 6 ·
Undergrad Intro and a Question About Ellipticity
- arakish
- · Replies 3 ·
Graduate Redshift from space expansion, & conservation of energy?
- CosmicVoyager
- · Replies 9 ·
Graduate What Should Be Discussed in a Report on Core Collapse of Massive Stars?
- tonysilva
- · Replies 5 ·
Undergrad Space Debris Removal: Where to Publish Idea?
- Eagle9
- · Replies 10 ·
High School Help with trying to spot the ISS
- iamBevan
- · Replies 9 ·
Undergrad Does Traveling Through a Wormhole Violate the Law of Conservation of Mass?
- permapoop
- · Replies 2 ·
Undergrad What were the starting materials of the Big Bang?
- Mitchtwitchita
- · Replies 15 ·
Graduate Star variable relations. In need of further insight
- Geonaut
- · Replies 10 ·
Stargazing Huge difference between a 6 dobsonian and a 10 ?
- erok81
- · Replies 2 ·
Undergrad Is the Old Model of the Universe Still Valid?
- binbots
- · Replies 10 ·
Graduate Time according to whom, after the big bang?
- komodekork
- · Replies 6 ·
High School Help with Modeling Solar Wobble for Pre-Calc Project
- robotoop
- · Replies 8 ·
Stargazing Why can this telescope only focus on very near objects?
- Harlan
- · Replies 5 ·
Graduate Does Movement of Masses Distort Spacetime Differently?
- AbsoluteChaos
- · Replies 21 ·
Graduate Is the Universe Infinite and Flat in Cosmology?
- Cosmo Novice
- · Replies 27 ·
Graduate Where's the energy go for planets axis inclined from orbital plane?
- Emu
- · Replies 7 ·
Undergrad Start Learning Cosmological Math Today
- narrator
- · Replies 8 ·
Graduate How Does Frame Dragging Affect Light Speed Observations?
- narrator
- · Replies 3 ·
Undergrad What is the role of gravity in superclusters?
- ajgrebel
- · Replies 3 ·
Undergrad How Kepler derived that T^2 is proportional to r^3
- parsa418
- · Replies 2 ·
Graduate How much of galaxy redshift is due to gravity?
- very_curious
- · Replies 22 ·
High School What an Expanding Universe Looks Like
- FeDeX_LaTeX
- · Replies 1 ·
Graduate Can Galaxies Have Two Nuclei Without Merging?
- chris2112
- · Replies 2 ·
Graduate Better Hubble Constant through Parallax?
- Subluminal
- · Replies 1 ·
High School Odds of Finding Alien Life: An Exploration
- Rocketjj
- · Replies 78 ·
Graduate Is Noether's theorem applicable to the expanding universe?
- quin dexter
- · Replies 44 ·