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 Regarding Higgs boson and ether model
  • virudh
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Graduate How well has the force of Dark Energy been calculated?
  • LuckyNate
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Graduate Distance expansion and escape velocity ( thought experiment )
  • marcus
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Undergrad What Is Galaxy 'Completeness'?
  • jl294
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Undergrad L-LOG-SUN - value on stellar data
  • robertrej
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What If Saturn Was a Sun? What Would Happen?
  • chuckd1356
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Graduate Where Did the Original Matter Come From?
  • dehouston
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Undergrad Why are the colours of nebulae different?
  • Mekon
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Graduate 3D cloaking changing gravitational lensing ?
  • Hypervelocity
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Undergrad Valles Marineras Origin and Origin of Asteroid Belt Linked?
  • elroyjetsn
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Graduate Could Mars's collision with orbiting asteroid reactivate atmosphere?
  • Matt Todd
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Undergrad Dark Energy: Big Bang, Big Crunch & Expansion
  • mysteriously
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Graduate Can quasars reactivate within an established galaxy?
  • Matt Todd
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Graduate What is the physical limit of compression of matter?
  • Matt Todd
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Undergrad The Cyclic Universe: A Theory of Formation and Evolution
  • Matt Todd
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Undergrad Are singularities shaped as a sphere.
  • MartinJH
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High School How do you write equations in LaTeX for both Windows and Mac?
  • goldsax
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Graduate Is There Infinite Matter in an Infinite Universe?
  • Teachme
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High School Inserting proper symbols/letters for equations
  • goldsax
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Graduate Mass, Velocity and Special Relativity
  • Irishwake
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Mysterious Flickering Star Over Beach
  • relativelyslow
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Graduate Is the Universe's Expansion Controlled by Gravity from a Black Hole?
  • oooTommy
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Graduate Universe of indistinguishable quanta?
  • Loren Booda
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High School Do eyepiece lengths affect telescope magnification?
  • alias25
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Undergrad What elements make up the core of a dying star?
  • nhmllr
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Graduate Is the Universe's Energy Increasing Due to Dark Energy?
  • edpell
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Undergrad Grail Mission to the Moon: Does Light Exert Pressure?
  • RJ Emery
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Graduate Why can Hawking Radiation not work in reverse?
  • rollcast
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Graduate Motion of celestial objects in Spacetime looks circular in 3D how?
  • VaibhavP
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Undergrad When Will the Andromeda and Milky Way Galaxies Merge and Could it Support Life?
  • Tregg Smith
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Graduate Special thread for answers to Mathbrain's questions
  • marcus
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Undergrad Neutron Star or a Pulsar - what decides
  • kranav
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High School Modular Physics: Largest Number in the Universe
  • SubZir0
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Graduate Why no attribution to Bohm regarding holographic principles
  • rjay
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Graduate Topic: Neutrinos and Gravity: Can They Travel Faster in Contracted Space?
  • keepitmoving
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How do I become God? I want a promotion in the universe
  • GladScientist
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Graduate Why do black holes appear to be eternal red instead of black?
  • hamson
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Graduate Why is it considered the 'end of the universe' when the stars go dark?
  • 01i
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Graduate Questions on diatomic spectroscopy
  • ollo
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Undergrad Where can I find a comprehensive online database for stellar data analysis?
  • robertrej
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High School Universe age?, I never really understood that
  • leviterande
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Graduate Are Infinite Universes Compatible with M-Theory and Chaotic Inflation?
  • HumbleNoob
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Undergrad Type IV Civilizations - Info & References
  • robousy
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Graduate Is time measured at receding objects dilated?
  • johne1618
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Undergrad Position of a Body on a Hyperbolic/Parabolic Orbit with Respect to Time
  • whiterook6
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High School Nonexistence outside the universe
  • Knux897
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Graduate Matter less Neutrons behave the same Less Inertia?
  • elroyjetsn
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Stargazing Coronal mass ejection arriving during a solar eclipse
  • Zodiakos
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Graduate What Are Entropy Perturbations in Cosmology?
  • LalithP
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Undergrad Please explain Dopler effect of light
  • thetexan
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High School How to become an astrophysicist or an astronomer ?
  • Kavin Hawaii
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Graduate Can We Aim Our Telescopes Towards the Edge of the Universe?
  • @nonymous
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Undergrad Angle of crab pulsar to the ecliptic
  • SUDOnym
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Graduate Time can't exist without matter (mass) and motion
  • Lakshya
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Graduate Does the Universe Ever Reach Maximum Entropy?
  • steenpat
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Graduate Sitting on a (very) extended object in space
  • johne1618
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Graduate The speed of light, the term light year , and reference frames.
  • ssknight7
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Graduate Two-Bodies Problem REAL SOLUTION
  • Trifis
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Graduate Could a Supermassive Black Hole be the Center of our Finite Universe?
  • jacksonb62
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  • Poll Poll
Undergrad Do we want to sent probe to Newly discovered planet 'Kepler-22b' now?
  • sr241
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Undergrad What is the efficiency of solar energy in geosynchronous orbit?
  • RobinSky
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Stargazing Which Mid-Priced Telescope Should I Choose?
  • Willis666
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Graduate Black Hole Falling in / Observer Perspective Question
  • Irishwake
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Graduate Just how spherical is a neutron star?
  • Vincent Neave
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High School Is it true that the earth's rotation is slowing down?
  • Masua
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Undergrad New Teacher Seeks Help on Universe Expansion & Space
  • Philip7575
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Graduate What is the True Meaning of 'Nothing' in A Universe from Nothing?
  • revo74
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Graduate Are You Using the Correct Formula to Convert Redshift to Megaparsecs?
  • Sagan369963
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Graduate Can Black Hole Evaporation Preserve Entropy While Losing Mass?
  • The Lobster
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High School Difference between shock wave and shock ?
  • sam_021
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High School How Universe is Born: Start of Universe
  • arunsais4
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Undergrad The meaning of z number in red shift
  • kc2dws
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Undergrad How do we know space is not infinite?
  • zeffur7
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Graduate Universal Expansion and the Distribution of Light
  • Irishwake
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Graduate How long ago did inflation end in the universe?
  • thetexan
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Graduate Could a Neutron Star's Color be Rayleigh-Jeans Blue?
  • Forestman
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Graduate Are thermalized neutrinos stable at temperatures their rest energy?
  • BillSaltLake
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High School Indoor Astronomy: Viewing Options for Cold Places
  • jnorman
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Graduate Some clarity on Black Hole Theory and Observations.
  • londounkm
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Undergrad Why does Venus have an atmosphere?
  • seagull68
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Undergrad Life on Europa vs. Jupiter's Electromagnetic field
  • livingod101
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Graduate If A Kind Soul Would Be Willing - Reality Check
  • apt403
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Graduate A question on virtual antiparticles and Hawking Radiation
  • jacksonb62
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Graduate Why Is a Distant Galaxy Blue Despite Redshift?
  • Last_Exile
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Icy(?) Comet Survives Pasage thru Solar Corona
  • Dotini
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Graduate Are Black Holes Deceivingly Still?
  • xXIHAYDOIXx
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Graduate Current value of the scale factor(R₀)?
  • EhsanZ
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Graduate What is the current value of the scale factor?
  • I_wonder
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Graduate Has the Universe's Entropy Decreased Over Time?
  • Omkar
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Graduate Dark Energy & Expansion of the Universe; Really ?
  • ChrisPhy
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Graduate Weinberg's Cosmology: Neglecting (1+z(eq)) in Denominator
  • EhsanZ
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Undergrad Why is Venus's atmosphere so hot?
  • Unbeliever
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Graduate I'd like to know your interpretation.
  • EhsanZ
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Graduate Why Do Pulsars Emit Radiation Despite Being Current Loops?
  • cragar
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Graduate Why Doesn't Dark Matter Collapse into Black Holes Like Regular Matter?
  • Routaran
  • · Replies 13 ·
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Graduate Protogalactic clouds vs protogalaxies help
  • sadeghi94
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Undergrad Is the Big Bang the Only Explanation for the Universe's Nature?
  • Godswitch
  • · Replies 21 ·
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Graduate Some repetitive mistakes and misconceptions about DM, MOND, TeVeS, and cosmology
  • juanrga
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Graduate Simple proof that the zero-point energy spectrum is Lorentz Invariant?
  • johne1618
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Graduate Can a Particle with Repulsive Properties Explain Dark Matter and Dark Energy?
  • E45
  • · Replies 28 ·
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