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 Is Dark Energy Usable for Energy Extraction?
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Graduate Why include -xi*H in the equation of state?
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Graduate Could Our Universe Be Inside a Black Hole?
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Undergrad Explaining Expanding Universe: Galaxies Moving Away
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Graduate Super hubble and subhorizon fluctuations
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High School Direction of the gravtional force on the earth
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Undergrad Equation to find the speed of a distant star
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Unusual Redness of Betelgeuse: A Mystery in the Night Sky?
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Graduate Can Inter-Universe Energy Transfer Create New Realities?
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Graduate What happens to a Black hole when they die?
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Graduate Studying the formation of the very first stars
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Undergrad Is the Sun's Gravity Enough to Propel Objects to the Corona?
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Graduate Black Holes have no gravity below the event horizon? - How can that be?
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The Next Naked Eye Comet: What to Expect & When
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Undergrad Could the Universe Be Collapsing Without Our Knowledge?
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Undergrad Sir Author Eddington and Einstein's GTR
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Graduate Can Black Holes Decay and How Does This Affect Their Event Horizon?
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Fantastic astrophotograpy book now out
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Undergrad Why Is a Single Wavelength Used to Calculate Hubble's Diffraction Limit?
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Asteroid 2009 DD45: Close Approach to Earth March 2nd
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Graduate The True Age of the Universe: Can We Ever Know It?
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Graduate How Do We Know Time, Space, and Matter Were Created in the Universe?
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Undergrad What would happen to Earth's orbit if it increased in mass or lost velocity?
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Graduate What will happen to Earth when hit by a Neutron Star at the Speed of Light?
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Undergrad Black Holes: Is the Hubble Image Real?
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  • Poll Poll
Are Visitors from Outerspace Likely To Be Friendly?
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Graduate HII regions, on-the-spot approximations
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High School Why Aren't Meteors Heated by Friction?
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High School How gravity make planet to rotate?
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High School Beginner Astronomy: Telescope Advice & Tips
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Undergrad Space in an Atom: What is the Nature of this Space?
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Graduate Constant k in Friedman Equation Explained
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Graduate Is Discrete Scale Relativity the Missing Piece of Einstein's Part III?
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Stargazing in Georgia: Left or Right?
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Graduate The Structure of the Cosmos: A Map Revealing the Intricacies of Our Universe
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Undergrad Can someone explain curved space time?
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Graduate Gravity has to have an effect on time,when gravity can curve space ,it
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High School Are There Stars Made of Something Other Than Hydrogen?
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Astrophysicist Jobs: What's Available?
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Undergrad Calculating Orbital Velocity for a Satellite Orbiting Earth
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Graduate How much does dust affect light from high redshift quasars?
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Graduate Accelerating Universe Expansion: Big Bang or Repulsive Force?
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Graduate Big bang, little bangs, or sontaneous creation?
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Graduate Is the Cosmic Microwave Background a Picture of the Universe's Past?
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High School Is 2009 Really the Year of Astronomy?
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Graduate Sun's Corona Paradox: Temperature Defying Laws of Thermodynamics
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Graduate Can We Detect Moons Around Earth-Sized Exoplanets?
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Graduate A Structure Larger than the Sloan Great Wall?
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Graduate Can Balloons and Foam Revolutionize Our Understanding of Cosmology?
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Graduate Could a Moon Be Transformed into a Mini Sun?
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High School Is the Sun Anchored? | Experiments & Feedback
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Undergrad What is singularity? [Black Hole ]
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Undergrad Is this the approximate gravity of Mars?
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Graduate Big Bang Predictions - Exploring Energy Density & Expansion Rate
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Graduate Singularity - Black Hole or Naked
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Graduate Confused about monochromatic flux
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Graduate Friction in space as approaching light speed
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Graduate Observing antiquark annihilation
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Graduate Possible website title: The Origin of the Universe: A Scientific Inquiry
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Undergrad Is the Red-Shift of Galaxy Spectra Evidence for the Expanding Universe?
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Undergrad Is the Big Crunch Inevitable in the Fate of Our Universe?
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Graduate Perpetuum mobile: tying galaxies together?
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Undergrad Can Aliens Observe Plato Lecturing in Academia?
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Stargazing Kepler Telescope is so productive?
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Undergrad Does Physics Predict How the Universe Will End?
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Graduate Understanding the 4-Dimensional Universe Expansion: A Philosopher's Perspective
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Graduate How Do Large Galaxy Fluctuations Challenge Standard Cosmological Models?
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Undergrad Why Do Orbits Take an Elliptical Shape?
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Graduate Friction necessary for planet formation?
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Graduate Does Gravity from Other Universes Affect Our Universe?
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Graduate Dark Energy, Distance to Galaxies and Distance in time.
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Stargazing Saturn with new DMK, grayscale camera
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Undergrad What is the magnitude of the magnetic field in solar wind?
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Undergrad How do we tell how far away a gamma burst was?
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Graduate Are black holes and quantum entanglement interconnected in cosmological studies?
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Graduate The Computational Universe: Debunking the Myth or Proving the Possibility?
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Undergrad Why Are Planetary Orbits in Our Solar System Mostly Coplanar?
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Undergrad Question about orbit determination with find_orb
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Graduate Is the Universe Really Expanding or Just an Optical Illusion?
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Graduate Ages of Stars from CMD: The Accuracy of CMD vs. Photometry Explained
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Graduate Are Gamma Ray Bursts a Threat to Life on Earth?
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Graduate Inconsistency in Concordance Model?
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Graduate Big Bang - Gravitational field of antimatter + matter before annihilation
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Stargazing Has an astronaut ever captured a photo of a solar eclipse from space?
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Graduate Why does a universe with a spherical geometry have to be finite?
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Graduate Mathematical principle for decomposing metric fluctuation
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Graduate Precession betrays Nemesis position?
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Graduate Dark Matter: An Unexplained Mystery
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Graduate Can dark energy be converted into dark mass?
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Graduate How many exoplanets with an atmospheric oxygen signature would be necessary?
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High School Creating oxygen(co2) out Of hydrogen
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Graduate Is the universe truly isotropic at its boundary?
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Stargazing I want to make an astronomical telescope
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Graduate Can a far distant star's momentum affect the universe's energy?
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High School May 10-12 1999 The Day the Solar Wind Disappeared
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Undergrad How Do We Determine the Direction of an Interstellar Signal?
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Undergrad At what point, if any, would a spaceshp burn up in space?
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How can I track Earth's distance to the sun on a specific date?
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High School What can be done about space junk
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Graduate Infinite density to finite density
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