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 Why the universe appears to have one time and three space dimensions
  • Micheal McG
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Graduate Universe as a cellular automaton
  • Terrr
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Undergrad How Do You Measure Gas Leaks in Space?
  • Billionaires
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Graduate Rest frames in the early universe?
  • Karl Coryat
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Real pictures of black hole eating a star?
  • fellupahill
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Graduate The Quark Epoch and the Existence of Space and Mass
  • Karl Coryat
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Graduate Does Dark Flow Challenge the Big Bang Theory?
  • fellupahill
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Is the Flash Scale of the Universe Animation Still Relevant?
  • Greg Bernhardt
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Graduate Dark Energy: Questions on Uniform Energy Density
  • MackBowen
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Undergrad Can anyone provide valuable information on dark flow for my astronomy paper?
  • redrum419_7
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Undergrad Why the sun didn't absorb heavy elements from early solar system?
  • arman4
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Graduate How Can Two Planets Observe Different Redshifts from the Same Star?
  • ch@rlatan
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Scale of the Universe: Zoom-In, Zoom-Out Animation for Kids
  • Constantinos
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From the Planck length to the Observable Universe
  • Bobbywhy
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Graduate Uniformity of Distance - Is It Possible to Prove?
  • DarkFalz
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Graduate All matter being liquid in 10^65 years if proton decay doesn't occur.
  • Dremmer
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Graduate Frame-Dragging, Density and Space-time Distortion
  • Theoretically
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Undergrad Is Iron Truly the Heaviest Element Formed in Stars?
  • manenbu
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Undergrad When a star loses its mass, do the orbital radii of the planets increase?
  • kd001
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Graduate Does Galactic Rotation Cause Frame Dragging?
  • H2Bro
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High School Way Way Bigger than Canis Majoris?
  • SYahoo
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Graduate How is universe curvature measured?
  • minio
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Undergrad Acceleration of spaceships with different masses?
  • GTOM
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Graduate Cosmology: Expansion & Its Impact on Us - Jens
  • jensel
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Graduate Debunking the Big Bang Theory: Colliding Branes as a Possible Alternative
  • stglyde
  • · Replies 100 ·
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Undergrad Blackholes and expanding universe
  • veejay
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Undergrad What is the Semi Major Axis of a Binary Star System?
  • goldsax
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Undergrad Precession-Jumping from 1875 to 1950
  • solarblast
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Undergrad How do Occupants of the ISS Survive a CME
  • RJ Emery
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Undergrad Gyroscopic effect on planetary motion
  • R Power
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Graduate Is Faster Than Light Travel Possible Through Controlled Space Expansion?
  • knicely
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Undergrad How massive/hot does a star have to be for fusion to occur
  • ugalpha
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Graduate What happened before the BIG BANG, Roger Penrose's Theory
  • aznasdf
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Undergrad Motions of stars inside elliptical galaxies?
  • dougettinger
  • · Replies 18 ·
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Undergrad Earth at the center of the Universe
  • ugalpha
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Graduate Is Paul Steinhardt's Statement "Rather Pathetic"? Why?
  • marcus
  • · Replies 114 ·
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Graduate Top Biosignatures for exo planet spectra
  • skydivephil
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Graduate Might NGC 1073 have a non-coplanar bar and spiral arms?
  • Paulibus
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Undergrad Search patterns in observational studies
  • stargazer3
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High School Which Has a Greater Gravitational Pull on Earth: Sun or Moon?
  • Natko
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Graduate Is the Acceleration of the Universe Expansion accelerating?
  • Swimmingly!
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Graduate Space, matter and physical models
  • bagheraa
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Undergrad Video Games and Their Basis in Theory
  • cjackson
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Graduate Big Bang Non-Locality: Evidence for an Infinite Universe?
  • Irishwake
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High School Why don't shooting stars make a noise?
  • shifty88
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Undergrad The Sun with a planet with a moon with a satellite
  • Loren Booda
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High School What is a Geomagnetic Storm and How Does it Affect Earth?
  • timacho
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Graduate Need Help Understanding Mass/Bent Space-Time
  • sirnamemr
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Graduate Heat death, quantum uncertainty and Feynman's Path Integral
  • Zedhex
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Graduate Which theory accurately explains the effect of gravity on light?
  • thetexan
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Graduate Detecting hydrogen inside IMC's and GMC's
  • dougettinger
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Graduate Are Void Centers Ultra-Massive Primordial Black Holes?
  • David Paul
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Graduate What is the nature of space and time?
  • Dremmer
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Stargazing Telescope Resolution: Max Res with Pieced Mirrors?
  • Drakkith
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Graduate What Steps Are Missing in Deriving Pogson's Law?
  • 71GA
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Graduate What Distinguishes the t=0 Singularity from a Black Hole Singularity?
  • ugalpha
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High School When did black holes first started to appear in the universe?
  • phy_freak
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Graduate Is Dark Matter the Result of the Big Bang?
  • phy_freak
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Undergrad What acceleration of universe means?
  • minio
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Graduate Star whose pressure support is degenerate electrons.
  • the ads 13
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High School Anyone heard of the solar snake Solar system theory?
  • esj001
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Graduate How inflation can give rise to irregularities
  • houhou.trad
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Undergrad Life on Earth: The Future of Humanity and the Impact of Space Exploration
  • Algren
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Graduate The quantum based calculation of the cosmological constant
  • salvestrom
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Undergrad At what volumetric flow rate will air fill a space vacuum at Earth's STP?
  • rcoopster
  • · Replies 19 ·
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Graduate The diffence between expanding universe and light slowing?
  • Edward Solomo
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Does anyone recognize this precession matrix?
  • solarblast
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Undergrad Computing the period of a meteor using two ways.
  • solarblast
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Undergrad Redshift as evidence of expansion
  • dpa
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Graduate Effects of Solar Flares on the Moon and Equiptment used for lunar exploration
  • MonserrateM
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Undergrad Cracovians Anyone? How do they work?
  • solarblast
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Graduate How can a 1-dimensional being prove they live on a circle?
  • ugalpha
  • · Replies 35 ·
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Graduate The history of orbital element methods
  • solarblast
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Undergrad Finding the position of an object 1800 years ago?
  • solarblast
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Undergrad Why Is the JUICE Mission Targeting Ganymede Instead of Europa?
  • skydivephil
  • · Replies 3 ·
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Undergrad Number of Planets with Circular Orbits: Probability & Science
  • Algren
  • · Replies 8 ·
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Graduate Is the Universe Expanding Into 4th Dimension?
  • Snip3r
  • · Replies 17 ·
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High School Will we always be in observation mode?
  • Vyom
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Graduate Girl Reaches 99.9% of Train's Speed Despite Time Slowing Down
  • Grimstone
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Graduate Calculating kinetic energy of all matter
  • jimjohnson
  • · Replies 8 ·
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Graduate Is the Universe Losing Energy and Heading Towards an Unfortunate End?
  • Algren
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Graduate Could the solar system have formed directly on the site of a supernova?
  • ericwdhs
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Graduate How can galxies and dwarf galaxies be made of regular AND dark matter?
  • fellupahill
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Undergrad Calculating Velocity & Axes of Planetary Orbits
  • smize
  • · Replies 16 ·
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Graduate Cosmological constant supports MOND
  • jimjohnson
  • · Replies 19 ·
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Graduate What would be some creative ways to make a black hole?
  • Antientrophy
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Graduate Are the Laws of the Universe Influenced by the Structure of Our Brains?
  • Ossama
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Graduate Did Time Begin with the Big Bang?
  • Khursed
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Undergrad The Milky Way from the Andromeda Galaxy: Edge-on, Spiral, or In-Between?
  • Fozzie
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Undergrad Kepler Exoplanet findings and galactic plane question
  • Ed Zachary
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Graduate Atmosphere on a hypothetical tidally-locked Earth
  • cephron
  • · Replies 4 ·
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Graduate Toroidal Universe: A 2003 Analysis
  • mathman
  • · Replies 16 ·
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Graduate What happened to the center of the universe?
  • Greylorn
  • · Replies 19 ·
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Graduate Do nebula's move? (Help calculating where things will be in the future)?
  • piareround
  • · Replies 7 ·
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Graduate Maximum Wind Speeds and Atmosphere Loss on Small Planets
  • LKD_
  • · Replies 4 ·
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Graduate Black Holes Relation to an Accelerated Expanding Universe
  • PVastro
  • · Replies 12 ·
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Human Limitations of understanding.
  • shifty88
  • · Replies 4 ·
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Graduate Does the Spin of a Supermassive Black Hole Influence Its Galaxy's Rotation?
  • TRB8985
  • · Replies 16 ·
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Graduate Shouldn't we have heard alien radio signals by now? Why not?
  • SeventhSigma
  • · Replies 52 ·
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Graduate Unveiling the Mystery of Magnetic Fields in Space
  • Lesnick
  • · Replies 5 ·
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