Astronomy, Astrophysics, Cosmology Forum

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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.
Graduate CMB Peak Fregenucy (Planck's law vs. Wein's law)
  • redrum419_7
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Undergrad Infinite monkey theorem - question(s)
  • Thomas1989
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High School Is there any star not belonging to any galaxy?
  • wdlang
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Graduate Do theories of quantum gravity require that space-time is a lattice?
  • james.goetz
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Graduate How to calculate CBR lambda vs age of universe?
  • Fire Tech
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Undergrad Sun's North Magnetic Pole Begins to Flip, South Not Moving Yet
  • Dotini
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Graduate Was energy already quantized 10^-43 seconds after the Big Bang?
  • CarlosLara
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Undergrad Relationship between expanding universe and time
  • 00Svo
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Graduate Need help with Gravitational Constant (G)
  • eggman100
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Graduate Could Anti-Dark Energy and Matter Exist in the Universe?
  • Some Slacker
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Graduate Geometry of Inflationary Universe?
  • Octavianus
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High School Write a Speech: "Time Waits for No One" & Cosmology
  • AHUGEMUSHROOM
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Graduate Calculating the direction of the center of the universe?
  • Throstur
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Graduate The Role of Inflation in the Expansion of the Universe
  • N3Wparadigm
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Graduate Can we extend our inertial frame globally?
  • johne1618
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Graduate Is there a limit on the rotational speed of fast spinning pulsars?
  • tigerstef
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Graduate What Are the Key Theories Behind the Multiverse Concept?
  • swiss_rebel
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Graduate Size of the Universe just after Big Bang
  • Steely Dan
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Undergrad How did elements and building blocks of life arrive on Earth?
  • Aziza
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Graduate Will space always expand when the space has vacuum energy and zero mass?
  • james.goetz
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Graduate How to Determine the Mass of an AGN from Solar Luminosity?
  • tomjennings
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Graduate Why such strange units of measure?
  • JArnold
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What is your opinion on John C. Mather
  • Futuregen600
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Why Should We Prioritize Manned Space Missions in Modern Exploration?
  • .net
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Graduate Cosmological redshift alternative explanation?
  • Aidyan
  • · Replies 5 ·
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High School Hubble's Misconception and the Discovery of Other Galaxies within Our Universe
  • hankaaron
  • · Replies 14 ·
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Undergrad Undergraduate research topic help?
  • C0smiicV0r3ex
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Graduate Neutron stars not sustained by degeneracy force?
  • dalcde
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Graduate Orbit Determination for Dummies Another hillbilly tutorial.
  • Jenab
  • · Replies 20 ·
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Graduate Big Bang vs Big Crunch: Universe w/No End
  • robert nies
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Graduate Cherenkov detector on a venus orbiter (Venera 9)
  • hangainlover
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Undergrad Radio doppler experiment (astro)
  • hangainlover
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Undergrad Understanding Local Standard of Rest for Astronomy Exam
  • mikerodeman
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Graduate What Insights Does the Fourth Dimension Offer About Our Universe?
  • timel0rd
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Graduate Density profile of Wolf Rayet stars
  • ajit.phys
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Graduate Why does the expansion of space in a uniform universe only push outward?
  • Farahday
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Graduate What's the precise relationship between Mass and Charge
  • sheshank
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Undergrad Limiting Magnitude of CCD Imaging
  • Drakkith
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Graduate Issues regarding the expansion of the Universe at the subatomic level
  • habarnam
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Graduate Origins of Scale Factor of FRW Metric and Misc Questions of GR Equations
  • ServusSomni
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Undergrad Elements on Earth: Supernova & Planets
  • yardtick
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Graduate Luneburg Lenses: Understanding Diffraction, Spill-over and Focusing
  • Jean Bickle
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Graduate How Can I Start Learning Numerical Simulations for Modeling Gamma-Ray Bursts?
  • ajit.phys
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Graduate Is gravity 'weak' because it leaks into higher dimensions?
  • B.Spinoza
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Undergrad Is There a Center to the Expanding Universe? And How Does Light Factor In?
  • allo4
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What is the mass of dark matter?
  • quantum12345
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Graduate Shouldn't we see faster expansion without dark energy
  • KeplerJunior
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Graduate What's Behind Dark Matter/Energy? What We're Missing
  • RK7
  • · Replies 11 ·
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High School What is the opposite of a supernova
  • cre8flow
  • · Replies 24 ·
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Graduate Understanding Black Holes: Perspectives and Questions
  • Thunderclap
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High School How do I find the age of a star?
  • ageorge95
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Graduate Question about the formation of a massive star
  • ldc3
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Graduate Slightly Modified Olbers Paradox Question
  • SHawking
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Undergrad Why Doesn't the Universe Explode Because of an Antimatter Reaction?
  • AntiPhysics
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Graduate Varying Fine Structure Constant and Vacuum Energy Density
  • asimov42
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Undergrad Is it possible to find our Sun's siblings?
  • saros
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Undergrad Massive Stars Spin Faster: The Reason Explained
  • Sean Pan
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Undergrad Visibility of Venus during the march equinox
  • kaleidoscope
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Graduate Metallicity and Stellar Formation
  • Drakkith
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Graduate Alternative theories being tested by Gravity probe B
  • Garth
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Graduate Did quantum degeneracy pressure drive inflation?
  • johne1618
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Undergrad Sending a rocket into space 75% less fuel.
  • uperkurk
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Graduate Is time just a perception of potential possibilities?
  • jaysteve
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Graduate Do Planck Units Remain Relevant Inside Black Holes?
  • BernieM
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How would you describe a black hole
  • cre8flow
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Undergrad Supernova in 2241 BC: Astronomer Views
  • cre8flow
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Undergrad Why does velocity not vary with distance within 10 Mpc?
  • em370
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Undergrad What Are Wormholes and How Do They Work?
  • Henzo
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Graduate How does the Big Bang Theory explain the creation of matter from energy?
  • John15
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Graduate Can the Moon sustain an atmosphere after terraforming?
  • Qshadow
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Graduate Are the Three Dimensions of Our Universe Independent?
  • jd12345
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High School Can Star Positions Be Accurately Predicted?
  • bignevermo
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Undergrad Is a Utah Petroglyph Evidence of the 1054 Supernova Observation?
  • ImaLooser
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Graduate Role of triatomic H ion (H3+) in early star formation
  • marcus
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Graduate Which fraction of the observed CMBR signal is due to some foreground contaminant
  • Tanelorn
  • · Replies 20 ·
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Graduate Spatial and temporal variation of alpha?
  • asimov42
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How do astrophysicists balance truth and creativity
  • cre8flow
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High School Does Light Really Stop and Turn Back When Reflected?
  • StevenJParkes
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Undergrad How is the big bang related to the general theory of relativity?
  • JJHK
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Graduate Can We Adjust Natural Constants to Obtain Stable Atoms in Other 'Multiverses'?
  • Aidyan
  • · Replies 13 ·
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Graduate Can Baryon Acoustic Oscillation Accurately Measure the Universe's Expansion?
  • bill alsept
  • · Replies 8 ·
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Graduate The 'nothingness' of the vacuum.
  • Naty1
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Graduate Does iron really kill fusion in stars?
  • ldc3
  • · Replies 5 ·
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Undergrad Follow-up and pipeline: definitions
  • RHK
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Graduate Hawking radiation and cosmic microwave background radiation
  • Orion1
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Graduate Obstacles to observing the cosmic neutrino background
  • bobsmith76
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Graduate Physical space properties questions
  • neginf
  • · Replies 8 ·
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High School Naked eye view from intergalactic space
  • Frankiewicz
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Graduate Does not receeding of galaxies decrease entropy
  • dpa
  • · Replies 1 ·
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High School Why Can We See Venus from Michigan?
  • dmayers94
  • · Replies 38 ·
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Graduate Is our universe a geodesically complete manifold?
  • TrickyDicky
  • · Replies 20 ·
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Graduate What is the issue with the concept of a center in the expanding universe?
  • Quinzio
  • · Replies 16 ·
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Undergrad Universe Expansion: Why Isn't Space Between Atoms Expanding?
  • Skeetss
  • · Replies 28 ·
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Undergrad Why do orbits become more eccentric when changing speed?
  • nothingbetter
  • · Replies 1 ·
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Graduate What can spectroscopy of this distant galaxy reveal about the universe at z~10?
  • Chronos
  • · Replies 5 ·
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Graduate Why doesn't light interact with dark matter?
  • uniquestring
  • · Replies 21 ·
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Graduate ISIS image subtraction program; trouble running
  • akf1001
  • · Replies 2 ·
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High School What can i see with this? (astronomy on a budget)
  • jehan60188
  • · Replies 11 ·
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Graduate Spacetime: continuous or quantized?
  • johann1301
  • · Replies 1 ·
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Can Satellite Watching Become an Addictive Hobby?
  • DaveC426913
  • · Replies 7 ·
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