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.
Undergrad Understanding Very Long Baseline Interferometry: Is the Formula the Same as #2?
  • s3a
  • · Replies 6 ·
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Graduate Is the Energy of the Universe Really Zero?
  • da_willem
  • · Replies 20 ·
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Graduate Increasing the mass of the moon (via pancake theory)
  • Princedragon
  • · Replies 5 ·
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Graduate What Causes Early Convective Instabilities in Supernova Explosions?
  • Chronos
  • · Replies 11 ·
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Stargazing Why are Radio Telescopes less detailed?
  • Vorde
  • · Replies 5 ·
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Stargazing Telescope for my astronomy class next semester
  • HeLiXe
  • · Replies 2 ·
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Graduate Hubble constant depend on expansion model?
  • johne1618
  • · Replies 3 ·
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Graduate Expanding Space: Explaining the Mystery
  • cragar
  • · Replies 4 ·
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Graduate Are the Outer Bands of Galaxies Moving Faster Than the Speed of Light?
  • DaddyJax
  • · Replies 10 ·
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Undergrad Our solar system and center of Milky way
  • ahmediukas
  • · Replies 7 ·
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Graduate Failure to calculate equation of time and declination of the sun
  • dwaynie
  • · Replies 4 ·
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Undergrad The Universe: A Mobius Strip of Possibilities?
  • infinitea
  • · Replies 2 ·
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Graduate No Obvious Objects Produce Gamma Rays
  • Dotini
  • · Replies 3 ·
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Undergrad Need a good textbook for astrophysics
  • achuthan1988
  • · Replies 1 ·
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Undergrad Is Hubble Constant Really Constant?
  • jayaramas
  • · Replies 5 ·
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Graduate Those Jets from the poles of black holes
  • Daniel Batt
  • · Replies 9 ·
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9
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Undergrad Newtons of an exploding Supernova
  • Physics quest
  • · Replies 14 ·
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14
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Graduate Need Help Settling a Debate About Guns in Space
  • scorpiooooooh
  • · Replies 8 ·
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8
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Undergrad Could an all water planet theorhetically exist?
  • larrybud
  • · Replies 20 ·
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Have I seen the layers of parallel universes.
  • datacloud
  • · Replies 14 ·
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Graduate Could a star survive a direct hit from a gamma ray burst?
  • Astroboy123
  • · Replies 13 ·
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Graduate Space-time created ahead of matter - how far?
  • Saddlestone
  • · Replies 37 ·
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Graduate Why Even Talk About Gravitons Even Existing?
  • NYSportsguy
  • · Replies 43 ·
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Undergrad Converting RA & Dec into Normal Earth Surface Latitude & Longitude
  • Gannet
  • · Replies 14 ·
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Graduate Nature of Dark Energy and a cracker in the sand
  • Hammer76
  • · Replies 21 ·
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High School Queen's song '39 - the only pop song about relativity?
  • Saddlestone
  • · Replies 3 ·
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3
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Graduate How do black holes radiate if nothing can escape?
  • 2sin54
  • · Replies 4 ·
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Graduate Need help understanding U.S. Naval Observatory's messed up algorithm
  • dwaynie
  • · Replies 7 ·
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Undergrad Why Does Lithium Stay on the Surface of the Sun?
  • sawtooth500
  • · Replies 4 ·
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Graduate Understanding the Universe: Explaining Light Speed and Expansion
  • Ut-Napishtim
  • · Replies 10 ·
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Graduate Average value of sin(i) in radial velocities (exoplanets)
  • cahill8
  • · Replies 1 ·
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Undergrad Force that the Earth exerts on the Moon
  • Poppinkrey
  • · Replies 7 ·
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Graduate What are Cosmic Rays and How Can They Help Us Understand the Universe?
  • Cluelessluke
  • · Replies 1 ·
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Graduate Reevaluating the Big Bang Theory: Challenging the 13.7 Billion Light Year Limit
  • shashankac655
  • · Replies 26 ·
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I'm writing a novel involving worm holes and asteroids/meteors
  • Haendelrsz
  • · Replies 3 ·
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Graduate How realistic is a time compression vacation destination with a high rate?
  • nemorosa
  • · Replies 11 ·
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Graduate Conflict between reionization and the most distant object
  • thenewmans
  • · Replies 6 ·
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Graduate Can Laser-Pushed Solar Sails Achieve Near Light Speed by Circling Back?
  • udtsith
  • · Replies 9 ·
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High School What is a parallel universe and how does it relate to physics?
  • VaibhavP
  • · Replies 5 ·
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Graduate Acceleration of two bodies in circular orbit provided by own gravity
  • Ry122
  • · Replies 2 ·
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Graduate Why the early universe didn't collapse into a black hole?
  • shazdeh
  • · Replies 18 ·
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Graduate State Space Analyis - the 'B' matrix
  • phiby
  • · Replies 2 ·
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Undergrad Could Protons and Electrons Explain the Big Bang's Origins?
  • aherrera
  • · Replies 7 ·
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Graduate Calculation of a planet's mass via wavelengths
  • Poppinkrey
  • · Replies 2 ·
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Undergrad Effects of dark energy on our solar system
  • VaibhavP
  • · Replies 6 ·
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Graduate Unveiling the Mystery of Antimatter Galaxies: Modern Cosmology's Perspective"
  • Delta2
  • · Replies 5 ·
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Graduate Universe's full cycle: explosion - implosion
  • Yuri B.
  • · Replies 1 ·
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Stargazing Spectra Optics telescope 1400X150 questions
  • Gliese123
  • · Replies 23 ·
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Graduate Comparing Sidereal & Synodic Reference Frames
  • Ry122
  • · Replies 1 ·
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Graduate Proof of Red Shift that indicates Expansion
  • Buckeye
  • · Replies 26 ·
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Graduate Electro-Gravity ideas, Dark Energy
  • happienumber
  • · Replies 7 ·
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Graduate Surprising Gamma Rays From Crab Nebula
  • Dotini
  • · Replies 4 ·
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Graduate Do all pulsars have a Pulsar wind nebula?
  • StephanJ
  • · Replies 1 ·
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Graduate What percentage of solar energy is converted to solar neutrinos?
  • jayaramas
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Graduate Cyclic Universe - Fixed in Size but Divided into 8 Sections
  • Buckeye
  • · Replies 7 ·
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Undergrad How do neutrinos behave near a black hole?
  • jayaramas
  • · Replies 5 ·
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Graduate How many dimensions compose reality?
  • Duhoc
  • · Replies 15 ·
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Graduate Dark matter or variable gravity?
  • slooper2112
  • · Replies 13 ·
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Graduate Arp 220 (UGC 9913, IC 4553) and Supernovae
  • Astronuc
  • · Replies 1 ·
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Graduate General relativity: a poor description of spacetime
  • skylark53
  • · Replies 10 ·
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Graduate Converting spectrum into velocity space
  • Piano man
  • · Replies 5 ·
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Graduate Explanation for gravity and mass?
  • IvorGeorge
  • · Replies 1 ·
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Graduate How Does Earth's Helical Trajectory Affect Its Calculated Speed Through Space?
  • TrickyDicky
  • · Replies 6 ·
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Undergrad Any difference between type 1a supernovae and a novae
  • srikar97
  • · Replies 8 ·
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Undergrad Should space exploration be only the developed world’s adventure?
  • shashankac655
  • · Replies 113 ·
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Undergrad What are the requirements for interstellar travel at different speeds?
  • Jon0815
  • · Replies 4 ·
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Graduate What Are the Flaws in Stenger's Argument on the Origins of Order?
  • bobsmith76
  • · Replies 3 ·
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Graduate Can Regular Matter and Dark Matter Be the Same Thing in Higher Dimensions?
  • raid1000
  • · Replies 1 ·
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Graduate How do I measure the distance of a galaxy using conventional terms?
  • Skolon
  • · Replies 8 ·
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High School Sun Angle: Differences by Season
  • DaveC426913
  • · Replies 14 ·
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Graduate Greatest cosmic energy detected by Veritas
  • TrickyDicky
  • · Replies 1 ·
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Graduate What is the Geometry of Spacetime Near the Big Bang?
  • Imax
  • · Replies 17 ·
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Graduate How Can I Use the Two-Point Correlation Function to Compare Image Structures?
  • mikeph
  • · Replies 6 ·
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Graduate What Causes the Sinusoidal Waviness in UARS Orbital Altitudes?
  • jna
  • · Replies 15 ·
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Undergrad Planet Hunters: First Two Planet Candidates Identified
  • Drakkith
  • · Replies 2 ·
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Graduate Unraveling the Mystery of Total Energy in the Universe
  • Curious6
  • · Replies 28 ·
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28
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Undergrad What is the relationship between dark matter and gravity?
  • confused????
  • · Replies 25 ·
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25
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Graduate Black Hole Radiation: Types, Perfect Blackbody & Collapsing Bodies
  • khil_phys
  • · Replies 26 ·
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6K
Undergrad How Does Mass Affect Stellar Luminosity and Simulations?
  • jdlawlis
  • · Replies 17 ·
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Graduate Found Another (Astrophysical) Error in Science Television
  • BadBrain
  • · Replies 13 ·
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Undergrad If center of galaxy is supermassive blackhole
  • Chitose
  • · Replies 28 ·
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28
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Undergrad Is gravity a weak force compared to other forces in the universe?
  • GRAViL59
  • · Replies 17 ·
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Graduate Wasn't the universe more disordered in the past?
  • zeromodz
  • · Replies 4 ·
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Graduate Info on the supernova accelerating space Nobel prize.
  • Agerhell
  • · Replies 2 ·
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Graduate What are the limits of redshift?
  • Lost in Space
  • · Replies 9 ·
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Graduate Photons vs neutrinos energy ratio
  • Calimero
  • · Replies 4 ·
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High School How do measure and know about the vast scale of the Universe?
  • kyler.e
  • · Replies 6 ·
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Undergrad Help me to get the names of all stars with their declination?
  • purnendu.007
  • · Replies 3 ·
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Graduate Creating a Sci-Fi World - Thea (Questions & Answers)
  • MattRob
  • · Replies 11 ·
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11
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Undergrad What is the centroid of the earth-moon system and how is it calculated?
  • Ry122
  • · Replies 4 ·
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4
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5K
Graduate Is it practically possible to look back in time?
  • Sobadzhiev
  • · Replies 11 ·
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11
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Graduate How does a very long object in space act with time
  • d3nd3
  • · Replies 7 ·
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7
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Graduate There is more meaning in the universe than there is matter
  • treehouse
  • · Replies 1 ·
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1
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Graduate Questions on Neutrinos: Mass, OPERA & More
  • AlfreCabo
  • · Replies 5 ·
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5
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3K
Graduate Accurate distance gauge out to z ~ 4 alleged (AGN)
  • marcus
  • · Replies 3 ·
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3
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3K
Undergrad Solar vs Lunar Tides: Explaining the Difference
  • The Head
  • · Replies 3 ·
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3
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Graduate From time to timescape – Einstein’s unfinished revolution?
  • Garth
  • · Replies 74 ·
3
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14K
Graduate How Does Accelerating Expansion Affect Space Density and Interjection?
  • keepit
  • · Replies 14 ·
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14
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5K
Graduate The universe's size : always infinite?
  • pedersean
  • · Replies 47 ·
2
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47
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Graduate Why can't we see anything fall into the black hole?
  • Sarcastic14
  • · Replies 1 ·
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1
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4K