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 Singularity in reference to blackholes and right before the big bang?
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High School Earth's Orbit & Tilt in N. America: Winter Closest, Summer Farthest
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Graduate Virial Theorem in Stellar Dynamics
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Undergrad Why is the closing velocity of Andromeda and our galaxy so high?
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Graduate JDEM/Beyond Einstein, is it still alive?
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Graduate Astrophysics Help: Calculating Mass of Hydrogen Converted in Sun Over 10B Years
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Undergrad The Secrets of the Universe: Measuring Age through Light Travel
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Undergrad A theory that universe is infinite
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Graduate Where Did the Superforce Go After Splitting?
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Graduate Abundances for Small Magellanic Cloud
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Undergrad Calculating the Earth's Elliptical Orbit around the Sun
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Graduate How Does Gravity Affect the Speed of Time Flow?
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Graduate Will a Halved Earth Orbital Period Affect Solar and Sidereal Days Differently?
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High School Why Do We See the Same Stars All Year?
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What are we waiting for to get into space?
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What New Images Did Messenger Capture During Its Mercury Fly-by
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Graduate The Big Bang: Where Did it Come From & Does Time Exist?
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Graduate My idea on what happened to all the antimatter.
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Graduate Center for Exoplanets and Habitable Worlds (news of improved instrumentation)
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Graduate Counting Subfields of F_p in Algebra
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High School Where Can a 9th Grader Find Advanced Astronomy Resources?
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Graduate What Aspects of the Universe Were Inflated During the Big Bang?
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Undergrad Figuring out mass of a star based on diameter
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High School Prove that the earth goes around the sun
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Undergrad Simple question about certainty/confidence in astronomy
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Graduate Do Population II Stars Have Planets?
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Graduate Should the universe's definition include higher spatial dimensions?
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Undergrad Can Light Travel Forever in Space While Baryonic Matter Decreases?
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Graduate Do Orbital Inclinations Affect Hohmann Transfer Efficiency?
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Graduate The Standard Model: Unified Forces or Unanswered Questions?
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Graduate Are We Real? Universe Baryons, Photons, Asymmetry
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High School Are G-forces smaller when traveling in space?
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Undergrad Light travelling through a black whole
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Undergrad Apparent Magnitude of Binary Star System
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Graduate Can a black hole be stabilized through Hawking radiation and mass feeding?
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Graduate Detecting Bulk Motion of 700 Clusters with KSZ Effect: Results & Implications
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High School Why Do Stars Appear to Move Away From Us?
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Graduate Is the Observable Universe Really Limited to 13.7 Billion Light-Years?
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Graduate Time coordinate in the rain frame
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Undergrad No Green Stars: What's the Story?
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Graduate Understanding the Chandrasekhar Limit: Neutron Stars & Spin Effects
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High School Why the earth is rotating along its axis?
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Graduate Dark Energy, the Cosmological Constant, General Relativity and you
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Graduate Does a Schwartzchild blackhole have a singularity?
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Stargazing Need Help - Learning to use a telescope
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Undergrad Benchmark redshifts to tell your kid brother or sister
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Graduate Couple of Bounce Questions Regarding Black Holes / Universe
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Undergrad Question about the orbiting plane of the moon
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Graduate Can We Reach and Surpass the Universe's Edge?
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Undergrad Background Radiation: Unraveling the Mysteries of the Universe
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Undergrad Single Dish Radio Astronomy Inefficiencies
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High School Understanding Mass, Energy & Space: How Much Energy Does it Take to Move 1 Ton?
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Graduate How long does it take for a white dwarf to go supernova through accretion?
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Stargazing Is a Radio Telescope Less Sensitive on the Galactic Plane?
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How many more dwarf planets can be named after deities?
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Undergrad Can we reach Mars using thrusters and maintain a constant velocity?
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Undergrad HELP .The Azimuth and Altitude of Star Vega
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Graduate What Can We Learn from the Distant Gamma Ray Burst GRB 080913?
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Undergrad The sum of all energy in the universe
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Undergrad Does Geological Evidence Support the Existence of Planet X?
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Graduate Can anything fall into a black hole?
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Graduate Why Do We Get an Einstein Cross Instead of a Skewed Ring?
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High School Building a Telescope with 6" Mirror & Focal Ratio of 3.3 - $50
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Graduate More on Infinity: Why Does Balloon Analogy Not Describe Universe?
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Graduate The inconsistent current picture of the universe?
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Graduate Does the expansion of the universe violate conservation of energy?
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Undergrad Earth's magnetism and Sun's temperature
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Graduate Identifying Cepheid Variables from Spectrum
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Graduate Loop Quantum Gravity: Is the Speed of Light a Function of Wavelength?
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Graduate Is dark energy constant to emtpy space?
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Graduate Collapse calculation (surce code?)
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Stargazing Shaving mirror for reflecting telescope
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Graduate Do Bounce Theories Consider the Role of Elements in Cosmic Collapses?
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Graduate Common parlance for Cosmo forum, proposed
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Graduate Relative Velocity: Can We Exceed the Speed of Light?
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High School Help Calculating Parallax Error - Physics Forums
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High School What Is the Fourth Dimension: Time, Space, or Something Else?
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Undergrad Hundreds of Rogue Black Holes in Our Galaxy - Is Earth at Risk?
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Graduate Matter, Antimatter, and Micro Black holes
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Graduate Origin of the Uinverse / baby universe
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Graduate Hydrodynamics of structure formation
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Graduate Inventing Moons and their Eclilpses-help
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Undergrad How do we know how much visible matter exists?
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Undergrad Orbital question(elliptical vs circular orbit)
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Undergrad Evaluating the age of a universe
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Graduate Upper BH mass limit, another structure formation clue?
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Graduate Right after the bigbang, microblackholes were formed
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Graduate Blue Shift objects; is there a list/table?
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Graduate Is Ned's Calculator Mislabeling Angular Size Distance?
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Undergrad Can Relativity Explain the Possibility of Aliens Visiting Earth?
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Graduate Modifying Newtonian Gravitational Force
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Graduate Oscillating universe and entropy
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Does MySpace Tom have a public personal email?
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Graduate What is the true nature of dark energy and its gravitational effects?
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Graduate Usefulness of a 4th spatial dimension
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Graduate Understanding Matter and Antimatter Interactions in Black Holes
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Identifying a Bright Celestial Object in FL, USA - Eraniamayomii
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High School What is the cause of the rotation of the planets
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Graduate If a blackhole contains a singularity, and the big bang was as well
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Undergrad 3 questions on Physical Cosmology
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