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 Update to the BALLOON ANALOGY web page
  • phinds
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High School Need Big Bang Theory Evidence for a school debate.
  • SchoolDebate
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Graduate How Can We Measure Earth's Speed Relative to the Big Bang?
  • Borzol
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Undergrad Is a Multiverse Considered a Universe or Multiple Universes?
  • Flustered
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High School What conditions must be met before star becomes a black hole?
  • Stu21
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Graduate Gravity speed (I know it's been beat to death, apologies in advance)
  • DNMock
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Graduate Dark Matter Galaxy Collision Galactic Double Slit Test
  • FesterCluck
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Graduate Density fluctuations that result after inflation
  • robertjford80
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Stargazing What is a good aperture for a telescope collecting ISO far-infrared radiation?
  • Quagz
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Graduate Define Red-Shift: Explaining BH Event Horizon
  • Aurora-Sky
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Graduate Could Quantum Mechanics Explain a Super Heavy Universe?
  • mitcho
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Graduate How do physicists use redshift to determine the expansion of the universe?
  • hitchiker
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Graduate How the shape of the universe affects density
  • robertjford80
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Graduate The phase transition of the universe during inflation
  • robertjford80
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High School What do the stars look like from space?
  • Albertgauss
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High School Are there other periodic phenomena's other than the comet Hally?
  • Karimspencer
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Graduate Matter at the core of a neutron star.
  • CarlosLara
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Graduate Is matter not expanding together with the rest of the universe?
  • TVI_1405
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Undergrad Type 2 Supernova: Energy Source & Type 1 Comparison
  • goldsax
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Graduate Frame Dragging Explained: Dimensions, Schwarzschild Radius, Metrics & Angles
  • eggman100
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Graduate Black holes and the event horizon
  • thedude36
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Graduate Position and velocity vector of point referred to equinox
  • solarblast
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Graduate Why Does 'a' Being Smaller Than 'a0' Eliminate μ in MOND?
  • mesa
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Graduate Cosmological expansion of earth orbit
  • Naty1
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Graduate Questions about (potential) variations in the Fine Structure Constant
  • Lino
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Graduate Practical Interstellar Mission to Alpha Centauri?
  • chill_factor
  • · Replies 23 ·
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Graduate Is the Universe Really Expanding or Are We Just Moving Faster?
  • Tyah
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Graduate Did the universe have a beginning?
  • Mononoke
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Graduate All things aside, how big could a black hole actually get?
  • Lunar-Scooter
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Graduate Looking for advice on solar system integrator
  • Deadstar
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Graduate How all matter antimatter particles annihilated after bigbang
  • hitchiker
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Graduate Another nail in the MOND coffin?
  • Chronos
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Undergrad Universe expansion is slowing down
  • Myslius
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Undergrad A question regarding the B-V measurements of stars
  • Rumor
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Does Matter's Mass Determine Space's Curvature?
  • quantum12345
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Undergrad Source of Hydrogen: Where Does Our Sun Get Its Fuel?
  • Zman
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High School What Would Happen if Earth Had Two Moons?
  • SCKnight14
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Undergrad What is the Event Horizon of a Black Hole?
  • AbsoluteZer0
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Graduate Are Charged Black Holes Just a Myth?
  • trini
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Graduate A flat-torus as the geometry of space-time
  • zhermes
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Graduate Is Infinite Inflation Possible After the Big Bang?
  • PantherModern
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Graduate Using the CMB to verify the universe is flat
  • robertjford80
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Undergrad Understanding Stellar Lifespans: Comparing Luminosity & Mass
  • tommyboo
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Undergrad Againwhat is a vaccum made of?
  • Desraj
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Graduate Why is the moon's gravity differential field pointing away from the
  • vin300
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White Dwarf, 12 Billion Years Old, Found Only 100LY Away
  • Dotini
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Graduate Gravitational Perturbation - How does it work?
  • Bjarne
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Can Ordinary Telescopes Detect Moon Bases?
  • WhiteHawk
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Graduate Accretion disk around galaxy NGC 4261
  • JeffOCA
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Undergrad Could SF6, Photosynthetic Bacteria, Hydrogen, and Ozone Make Mars Habitable?
  • Frogeyedpeas
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Could Life Adapt to the Solar Flares of Red Dwarf Stars?
  • phyzguy
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Undergrad Layman question about distance and speed of light
  • Gaddasconi
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Graduate FRW Derivation History: Acker's Questions Answered
  • Acker
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Graduate Index of Refraction of Outer/Interplanetary Space
  • Jolb
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Graduate What is the significance of a universe emerging from nothing?
  • Chalnoth
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Graduate Is this possible? (regarding observable and actual size of universe)
  • Kaldanis
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Graduate Re: CMB Redshift Question (Visible Wavelengths)
  • JArnold
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High School Asteroid hits moon → moon hits Earth possible?
  • Blue_Jaunte
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High School Asteroid, Meteorite, Meteoroid, or Meteor?
  • jenny_shoars
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Graduate Dark Matter on Trial: Serious Blow to Theories?
  • Mononoke
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Graduate Pauli Exclusion Principle in Black Holes.
  • CarlosLara
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Graduate Proportion of energy compared to mass in universe
  • auntio
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Graduate What does a more massive neutron star constitute?
  • tomjennings
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Graduate How Can Space Exist Without Time?
  • peacerenity
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Graduate Gravitational waves in elsewhere of light cone
  • PhysicoRaj
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Undergrad Solar elements and their placement
  • Riptide
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Stargazing How do i make a telescope computerized?
  • Patridor
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Graduate What is Jean's Creation in Relation to Interstellar Mediums?
  • Mabs
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Undergrad Why Isn't the Moon's Shadow Line Perpendicular to the Sun-Moon Line?
  • johann1301
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Graduate Can Jupiter Become a Stable Star?
  • Bavid
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High School Science Fair Project Ideas for Astronomy
  • Masonn
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Undergrad Are there any fields of astrophysics with no general relativity?
  • chill_factor
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Undergrad How Does Visible Light from Quasars Reach Us?
  • seandarcher
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Is Nothing Still Considered Something?
  • Lensman
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Graduate What Happens to Sound Waves Near Black Holes?
  • freddy123
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Undergrad What is the photon sphere and where is the singularity in a black hole?
  • AbsoluteZer0
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Graduate How do we infer a closed universe from FLRW metric?
  • pellman
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Graduate Is the Dark Matter Hypothesis Dead?
  • LouisB
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Graduate How to find scale factor at recombination?
  • eherrtelle59
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Graduate How Long Does the Bipolar Outflow Stage Last in Proto/T Tauri Stars?
  • skydivephil
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What makes a great astrophysicist
  • cre8flow
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High School What If the Big Bang Was Caused by Another Universe?
  • KevinT
  • · Replies 10 ·
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High School Effects on earth from a heavier moon
  • Tomp115
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Undergrad Is the Universe Flat or Curved?
  • kaushik_s
  • · Replies 38 ·
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Graduate Chromosphere population inversion?
  • jabowery
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High School Do all stars have same revolving speed?
  • Ravi Mandavi
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High School What Makes Black Holes So Mysterious: Do They Really Absorb Light?
  • Marshallaw4
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Graduate Linear model uniquely implies a boundary to our Universe?
  • johne1618
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High School How do we move around the sun?
  • spark802
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Graduate What will Juice tell us about Europa?
  • skydivephil
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Undergrad Density of Venus' atmosphere - historical
  • PhilDSP
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High School How does and object get its color?
  • Marshallaw4
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Undergrad What Makes Gamma Ray Bursts a Fascinating Field of Study?
  • SHISHKABOB
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Graduate Where Does Gravity Originate From and Why Is It So Weak?
  • Snowgooned
  • · Replies 13 ·
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Undergrad How can I calculate planet trajectory for a 2d solar system simulation?
  • avpx
  • · Replies 11 ·
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High School History of the Earth's Axial Tilt
  • TheAzn
  • · Replies 2 ·
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Undergrad Does Higher Luminosity Mean Higher Power in Stars?
  • Mafia
  • · Replies 3 ·
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High School What is the actual colour of the Sun?
  • MegaDeth
  • · Replies 7 ·
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Graduate What proof do we have that TIME exists?
  • Homesick345
  • · Replies 149 ·
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Graduate Could Multiple Big Bangs and Dark Energy Explain the Expanding Universe?
  • Dsjodin
  • · Replies 21 ·
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