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 History of the Earth's Axial Tilt
- TheAzn
- · Replies 2 ·
Undergrad Does Higher Luminosity Mean Higher Power in Stars?
- Mafia
- · Replies 3 ·
High School What is the actual colour of the Sun?
- MegaDeth
- · Replies 7 ·
Graduate What proof do we have that TIME exists?
- Homesick345
- · Replies 149 ·
Graduate Could Multiple Big Bangs and Dark Energy Explain the Expanding Universe?
- Dsjodin
- · Replies 21 ·
Graduate CMB Peak Fregenucy (Planck's law vs. Wein's law)
- redrum419_7
- · Replies 1 ·
Undergrad Infinite monkey theorem - question(s)
- Thomas1989
- · Replies 15 ·
High School Is there any star not belonging to any galaxy?
- wdlang
- · Replies 5 ·
Graduate Do theories of quantum gravity require that space-time is a lattice?
- james.goetz
- · Replies 2 ·
Graduate How to calculate CBR lambda vs age of universe?
- Fire Tech
- · Replies 8 ·
Undergrad Sun's North Magnetic Pole Begins to Flip, South Not Moving Yet
- Dotini
- · Replies 4 ·
Graduate Was energy already quantized 10^-43 seconds after the Big Bang?
- CarlosLara
- · Replies 2 ·
Undergrad Relationship between expanding universe and time
- 00Svo
- · Replies 26 ·
Graduate Need help with Gravitational Constant (G)
- eggman100
- · Replies 6 ·
Graduate Could Anti-Dark Energy and Matter Exist in the Universe?
- Some Slacker
- · Replies 10 ·
Graduate Geometry of Inflationary Universe?
- Octavianus
- · Replies 1 ·
High School Write a Speech: "Time Waits for No One" & Cosmology
- AHUGEMUSHROOM
- · Replies 2 ·
Graduate Calculating the direction of the center of the universe?
- Throstur
- · Replies 9 ·
Graduate The Role of Inflation in the Expansion of the Universe
- N3Wparadigm
- · Replies 20 ·
Graduate Can we extend our inertial frame globally?
- johne1618
- · Replies 5 ·
Graduate Is there a limit on the rotational speed of fast spinning pulsars?
- tigerstef
- · Replies 28 ·
Graduate What Are the Key Theories Behind the Multiverse Concept?
- swiss_rebel
- · Replies 1 ·
Graduate Size of the Universe just after Big Bang
- Steely Dan
- · Replies 19 ·
Undergrad How did elements and building blocks of life arrive on Earth?
- Aziza
- · Replies 6 ·
Graduate Will space always expand when the space has vacuum energy and zero mass?
- james.goetz
- · Replies 5 ·
Graduate How to Determine the Mass of an AGN from Solar Luminosity?
- tomjennings
- · Replies 6 ·
Graduate Why such strange units of measure?
- JArnold
- · Replies 3 ·
What is your opinion on John C. Mather
- Futuregen600
- · Replies 7 ·
Why Should We Prioritize Manned Space Missions in Modern Exploration?
- .net
- · Replies 4 ·
Graduate Cosmological redshift alternative explanation?
- Aidyan
- · Replies 5 ·
High School Hubble's Misconception and the Discovery of Other Galaxies within Our Universe
- hankaaron
- · Replies 14 ·
Undergrad Undergraduate research topic help?
- C0smiicV0r3ex
- · Replies 3 ·
Graduate Neutron stars not sustained by degeneracy force?
- dalcde
- · Replies 1 ·
Graduate Orbit Determination for Dummies Another hillbilly tutorial.
- Jenab
- · Replies 20 ·
Graduate Big Bang vs Big Crunch: Universe w/No End
- robert nies
- · Replies 2 ·
Graduate Cherenkov detector on a venus orbiter (Venera 9)
- hangainlover
- · Replies 2 ·
Undergrad Radio doppler experiment (astro)
- hangainlover
- · Replies 3 ·
Undergrad Understanding Local Standard of Rest for Astronomy Exam
- mikerodeman
- · Replies 8 ·
Graduate What Insights Does the Fourth Dimension Offer About Our Universe?
- timel0rd
- · Replies 1 ·
Graduate Density profile of Wolf Rayet stars
- ajit.phys
- · Replies 2 ·
Graduate Why does the expansion of space in a uniform universe only push outward?
- Farahday
- · Replies 1 ·
Graduate What's the precise relationship between Mass and Charge
- sheshank
- · Replies 9 ·
Undergrad Limiting Magnitude of CCD Imaging
- Drakkith
- · Replies 14 ·
Graduate Issues regarding the expansion of the Universe at the subatomic level
- habarnam
- · Replies 15 ·
Graduate Origins of Scale Factor of FRW Metric and Misc Questions of GR Equations
- ServusSomni
- · Replies 16 ·
Undergrad Elements on Earth: Supernova & Planets
- yardtick
- · Replies 6 ·
Graduate Luneburg Lenses: Understanding Diffraction, Spill-over and Focusing
- Jean Bickle
- · Replies 5 ·
Graduate How Can I Start Learning Numerical Simulations for Modeling Gamma-Ray Bursts?
- ajit.phys
- · Replies 4 ·
Graduate Is gravity 'weak' because it leaks into higher dimensions?
- B.Spinoza
- · Replies 32 ·
Undergrad Is There a Center to the Expanding Universe? And How Does Light Factor In?
- allo4
- · Replies 8 ·
What is the mass of dark matter?
- quantum12345
- · Replies 3 ·
Graduate Shouldn't we see faster expansion without dark energy
- KeplerJunior
- · Replies 6 ·
Graduate What's Behind Dark Matter/Energy? What We're Missing
- RK7
- · Replies 11 ·
High School What is the opposite of a supernova
- cre8flow
- · Replies 24 ·
Graduate Understanding Black Holes: Perspectives and Questions
- Thunderclap
- · Replies 1 ·
High School How do I find the age of a star?
- ageorge95
- · Replies 49 ·
Graduate Question about the formation of a massive star
- ldc3
- · Replies 6 ·
Graduate Slightly Modified Olbers Paradox Question
- SHawking
- · Replies 2 ·
Undergrad Why Doesn't the Universe Explode Because of an Antimatter Reaction?
- AntiPhysics
- · Replies 14 ·
Graduate Varying Fine Structure Constant and Vacuum Energy Density
- asimov42
- · Replies 8 ·
Undergrad Is it possible to find our Sun's siblings?
- saros
- · Replies 12 ·
Undergrad Massive Stars Spin Faster: The Reason Explained
- Sean Pan
- · Replies 5 ·
Undergrad Visibility of Venus during the march equinox
- kaleidoscope
- · Replies 3 ·
Graduate Metallicity and Stellar Formation
- Drakkith
- · Replies 3 ·
Graduate Alternative theories being tested by Gravity probe B
- Garth
- · Replies 371 ·
Graduate Did quantum degeneracy pressure drive inflation?
- johne1618
- · Replies 2 ·
Undergrad Sending a rocket into space 75% less fuel.
- uperkurk
- · Replies 1 ·
Graduate Is time just a perception of potential possibilities?
- jaysteve
- · Replies 3 ·
Graduate Do Planck Units Remain Relevant Inside Black Holes?
- BernieM
- · Replies 9 ·
How would you describe a black hole
- cre8flow
- · Replies 6 ·
Undergrad Supernova in 2241 BC: Astronomer Views
- cre8flow
- · Replies 4 ·
Undergrad Why does velocity not vary with distance within 10 Mpc?
- em370
- · Replies 4 ·
Undergrad What Are Wormholes and How Do They Work?
- Henzo
- · Replies 16 ·
Graduate How does the Big Bang Theory explain the creation of matter from energy?
- John15
- · Replies 51 ·
Graduate Can the Moon sustain an atmosphere after terraforming?
- Qshadow
- · Replies 5 ·
Graduate Are the Three Dimensions of Our Universe Independent?
- jd12345
- · Replies 1 ·
High School Can Star Positions Be Accurately Predicted?
- bignevermo
- · Replies 6 ·
Undergrad Is a Utah Petroglyph Evidence of the 1054 Supernova Observation?
- ImaLooser
- · Replies 3 ·
Graduate Role of triatomic H ion (H3+) in early star formation
- marcus
- · Replies 1 ·
Graduate Which fraction of the observed CMBR signal is due to some foreground contaminant
- Tanelorn
- · Replies 20 ·
Graduate Spatial and temporal variation of alpha?
- asimov42
- · Replies 1 ·
How do astrophysicists balance truth and creativity
- cre8flow
- · Replies 2 ·
High School Does Light Really Stop and Turn Back When Reflected?
- StevenJParkes
- · Replies 2 ·
Undergrad How is the big bang related to the general theory of relativity?
- JJHK
- · Replies 3 ·
Graduate Can We Adjust Natural Constants to Obtain Stable Atoms in Other 'Multiverses'?
- Aidyan
- · Replies 13 ·
Graduate Can Baryon Acoustic Oscillation Accurately Measure the Universe's Expansion?
- bill alsept
- · Replies 8 ·
Graduate The 'nothingness' of the vacuum.
- Naty1
- · Replies 1 ·
Graduate Does iron really kill fusion in stars?
- ldc3
- · Replies 5 ·
Undergrad Follow-up and pipeline: definitions
- RHK
- · Replies 4 ·
Graduate Hawking radiation and cosmic microwave background radiation
- Orion1
- · Replies 5 ·
Graduate Obstacles to observing the cosmic neutrino background
- bobsmith76
- · Replies 1 ·
Graduate Physical space properties questions
- neginf
- · Replies 8 ·
High School Naked eye view from intergalactic space
- Frankiewicz
- · Replies 4 ·
Graduate Does not receeding of galaxies decrease entropy
- dpa
- · Replies 1 ·
High School Why Can We See Venus from Michigan?
- dmayers94
- · Replies 38 ·
Graduate Is our universe a geodesically complete manifold?
- TrickyDicky
- · Replies 20 ·
Graduate What is the issue with the concept of a center in the expanding universe?
- Quinzio
- · Replies 16 ·
Undergrad Universe Expansion: Why Isn't Space Between Atoms Expanding?
- Skeetss
- · Replies 28 ·
Undergrad Why do orbits become more eccentric when changing speed?
- nothingbetter
- · Replies 1 ·
Graduate What can spectroscopy of this distant galaxy reveal about the universe at z~10?
- Chronos
- · Replies 5 ·