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 Gnawing questions about the Edge of our Universe
  • Quiksilver421
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The Cosmic Romance of Binary Stars: How Are They Formed?
  • Newtons Apple
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Undergrad Is Anti-Matter Hiding in the Universe as Dark Matter?
  • Ravi Mandavi
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Undergrad Revolutionizing Space Travel: The Potential of Dual Space Elevators
  • FXForLife
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Graduate Are galaxies moving faster than the speed of light?
  • Gregory.gags
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Graduate Dark matter and gravitational pull of energy
  • guss
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Undergrad Difference Between Plasma and Radiation
  • hamzaaaa
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Undergrad First magnetic phenomenon observed on the Sun
  • colin456
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Flyaround video of Vesta as seen from low orbit by Dawn
  • marcus
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Stargazing Telescope optical path length vs focal length
  • balaonspace
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Graduate Where can i find tensor analysis expained physically in simplest words?
  • G.S.RAMYA
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Graduate Are We Accelerating Away from Distant Galaxies?
  • Daniel Batt
  • · Replies 11 ·
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Undergrad Difference Between Solar proton event and Coronal mass Ejection
  • hamzaaaa
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Graduate Redshift Effect on Absorption/Emission Lines
  • Drakkith
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Graduate Could a carbon planet have been formed in the solar system?
  • Shraa
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High School Was I Spotting Mars in the East?
  • TeddeF
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High School Why do certain objects in space orbit others?
  • accelerate23
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Graduate What is the conflict between General theory of relativity and Quantum theory?
  • G.S.RAMYA
  • · Replies 38 ·
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Graduate The Mass cut - The relation between 44Ti and 56Ni in supenovae remnants
  • PaulWright
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Dark Matter Core Defies Explanation
  • Lensman
  • · Replies 28 ·
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Undergrad Can we seek out worlds closer to the center of the galaxy?
  • Dark Universe
  • · Replies 27 ·
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Graduate Why don't we see the other dimensions ?
  • Abidal Sala
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Undergrad Oribtal and rotational velocities
  • mun
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Graduate Are there any peer reviewed sources of a theory which calls for a smaller
  • =entropy
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Graduate Time curvature and twin paradox.
  • Imax
  • · Replies 24 ·
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Graduate How much speed does a satellite gain when orbiting through resistance?
  • Bjarne
  • · Replies 10 ·
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Graduate Understanding Universe from laws extracted from the Universe?
  • ExNihilo
  • · Replies 5 ·
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High School Intelligent Life on Europa Speculation
  • golmschenk
  • · Replies 7 ·
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Undergrad What is our Solar System's orbital plane around the Milky Way?
  • Chaos' lil bro Order
  • · Replies 43 ·
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Graduate Questions about geometric albedo and phase angle
  • nnj
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Graduate Does any gravitating body emit Hawking radiation?
  • johne1618
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Graduate Will the Universe End in a Big Crunch?
  • jacksdvds
  • · Replies 35 ·
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Graduate Exploring Black Hole Anatomy: The Singularity, Event Horizon, and Photon Sphere
  • bill alsept
  • · Replies 67 ·
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Undergrad Newbie question about expanding universe
  • cask1
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Proving the Moon Landing: Facts and Evidence
  • ryder
  • · Replies 4 ·
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Stargazing Looking to buy my first telescope
  • Millacol88
  • · Replies 11 ·
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Graduate Important question (possible end of the world scenerio?)
  • mzoltan14
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Graduate The Limitations of Intergalactic Travel
  • eNtRopY
  • · Replies 104 ·
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Undergrad What lies beyond the visible universe?
  • Dark Universe
  • · Replies 1 ·
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Graduate How to Calculate the Length of a Quasar Jet?
  • ibysaiyan
  • · Replies 1 ·
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Graduate List of Questions about Black Holes
  • MeLlamoLlama
  • · Replies 15 ·
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Graduate What Are Essential Papers on Big Bang and Energy Origins?
  • Hypatio
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Graduate How comes the big bang singularity didn't need space and time?
  • Abidal Sala
  • · Replies 6 ·
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Graduate What are the Physical effects of the expansion of the Universe
  • ashwinnarayan
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Graduate Age of the Universe: Can We Assign an Exact Age?
  • Froglet
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Undergrad What causes the variation in Mercury's synodic period?
  • niki999
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High School Jupiter-Venus Conjunction: How Often Does It Occur and How Can We Calculate It?
  • iamBevan
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Undergrad What is a wormhole and how does it relate to the universe and space?
  • Ravi Mandavi
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Graduate Can We Witness the Big Bang with FTL Travel?
  • dpa
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Graduate Are dark energy and dark matter the same?
  • clarinets
  • · Replies 5 ·
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Graduate Is the Universe Finite or Infinite?
  • QuantumJG
  • · Replies 115 ·
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Undergrad Celestial sphere and visible stars
  • LAHLH
  • · Replies 6 ·
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Stephen Hawking starring in The big bang thoery.
  • MartinJH
  • · Replies 12 ·
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Undergrad How to learn celestial mechanics
  • pc2-brazil
  • · Replies 20 ·
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Is the Multiverse Theory Changing Our Understanding of Cosmology?
  • Otherkin
  • · Replies 78 ·
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Undergrad The perihelion precession of Jupiter
  • Bjarne
  • · Replies 9 ·
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Where can I find reliable sources for online astrophysics lessons?
  • choc1202
  • · Replies 3 ·
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Graduate Thoughts on Space/Time and Gravity
  • Manosapien
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Detecting an Ancient Civilization's satellite?
  • Archaeopteryx
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Graduate Distances to galaxies using the Hubble Relation: look-back time
  • Froglet
  • · Replies 17 ·
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High School What Geomagnetic Storms release proton or electron?
  • oem7110
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Graduate Dark energy expansion and the Hubble diagram
  • Froglet
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Graduate The Significance of Pi: Is It Related to Spatial Dimensions?
  • mjacobsca
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Graduate Ratio of projectile to ejecta mass, shoot the moon.
  • Spinnor
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Graduate Particles of the most recent Solar ejection.
  • Rob D
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Graduate Why Do We Use a Mean Sun That Moves Along the Equator Instead of the Ecliptic?
  • JeffOCA
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Graduate Scalefactor calculations for special cases using the Friedmann Equation
  • karan9
  • · Replies 6 ·
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Stargazing Why Are Planets So Small Through My Telescope?
  • upgrade3
  • · Replies 30 ·
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Undergrad How can we know/check the sun's current and latest chemical composition?
  • kweba
  • · Replies 4 ·
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Graduate What Has SETI Ruled Out in the Search for Alien Civilizations?
  • Rasalhague
  • · Replies 38 ·
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Undergrad Dark matter - observational evidence
  • sri sharan
  • · Replies 14 ·
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Graduate Looking for someone who can do calculations on flyby anomaly.
  • Messenger
  • · Replies 9 ·
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High School Uncovering the Mystery of Anti-Matter in Our Galaxy
  • Tanelorn
  • · Replies 5 ·
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Graduate Maximum entropy implies linear expansion?
  • johne1618
  • · Replies 7 ·
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Graduate Light elements abundance in a static toy universe
  • TrickyDicky
  • · Replies 69 ·
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High School Huge solar flare heading for earth
  • StevieTNZ
  • · Replies 3 ·
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Undergrad How much space does a Pound of copper use
  • John1397
  • · Replies 9 ·
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High School Physics or Astronomy informative speech ideas?
  • .net
  • · Replies 2 ·
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High School Where are free online classes for Scientific Notation?
  • blackstar5000
  • · Replies 3 ·
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Graduate Strength of materials - neutron stars
  • chill_factor
  • · Replies 7 ·
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Undergrad What Is the Estimated Number of Homeless Planets in Our Galaxy?
  • JonDE
  • · Replies 4 ·
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Undergrad Why Does Titan Have Fewer Impact Craters?
  • LumenPlacidum
  • · Replies 5 ·
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Graduate Silly Dark matter question: why exactly is it necessary?
  • mb2bm55
  • · Replies 3 ·
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Undergrad How do low mass stars outlive high mass stars?
  • Henry365
  • · Replies 7 ·
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Undergrad Uncovering the Mystery of the Wow Signal: Can We Locate Its Source?
  • aquitaine
  • · Replies 6 ·
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Graduate What is the total entropy of the universe today
  • avery
  • · Replies 11 ·
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Graduate Question about Cosmic Bagground Radiation
  • Sahota
  • · Replies 3 ·
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Undergrad How Does Gravity Work From Earth's Core to the Universe's Edge?
  • fellupahill
  • · Replies 4 ·
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The expansion of the universe art video
  • dictator666
  • · Replies 10 ·
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Graduate LQC Lambda-CDM model bounce radius
  • Orion1
  • · Replies 2 ·
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Graduate What can be Determined from Colour-Colour Diagrams?
  • Ricky116
  • · Replies 3 ·
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Undergrad Where Does Kinetic Energy Go During Deceleration?
  • Bjarne
  • · Replies 6 ·
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Undergrad Velocity determination through redshift
  • ShayanJ
  • · Replies 2 ·
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Graduate Does the expansion of space only occur in unbound systems?
  • waterfall
  • · Replies 6 ·
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Undergrad Symmetry of the Universe: Why Doesn't 0 = cba?
  • toph.roshi
  • · Replies 3 ·
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High School Understanding Gravity: Causes, Sources, and Strength Explained
  • 3112100000
  • · Replies 19 ·
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Undergrad How much of an effect does fusion have on a star's gravity?
  • HowardVAgnew
  • · Replies 8 ·
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Graduate Transferring Matter between Bubble Universes
  • Shaira
  • · Replies 3 ·
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Graduate Where Does Our Universe Exist in Relation to Branes?
  • RJ Emery
  • · Replies 1 ·
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High School My random thoughts about the sun, black holes, and gravity.
  • Cait
  • · Replies 1 ·
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