Astronomy and Astrophysics Forum

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Join in expert discussion on the topics of Astronomy and astrophysics. This may include discussion on celestial objects, space, and the physical universe as a whole. Mainstream science only.
Undergrad Our solar system and center of Milky way
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Graduate Failure to calculate equation of time and declination of the sun
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Graduate No Obvious Objects Produce Gamma Rays
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Undergrad Need a good textbook for astrophysics
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Undergrad Is Hubble Constant Really Constant?
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Graduate Those Jets from the poles of black holes
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Undergrad Newtons of an exploding Supernova
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Graduate Need Help Settling a Debate About Guns in Space
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Undergrad Could an all water planet theorhetically exist?
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Graduate Could a star survive a direct hit from a gamma ray burst?
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Graduate Why Even Talk About Gravitons Even Existing?
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Undergrad Converting RA & Dec into Normal Earth Surface Latitude & Longitude
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High School Queen's song '39 - the only pop song about relativity?
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Graduate How do black holes radiate if nothing can escape?
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Graduate Need help understanding U.S. Naval Observatory's messed up algorithm
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Undergrad Why Does Lithium Stay on the Surface of the Sun?
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Graduate Average value of sin(i) in radial velocities (exoplanets)
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Undergrad Force that the Earth exerts on the Moon
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I'm writing a novel involving worm holes and asteroids/meteors
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Graduate How realistic is a time compression vacation destination with a high rate?
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Graduate Can Laser-Pushed Solar Sails Achieve Near Light Speed by Circling Back?
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Graduate Acceleration of two bodies in circular orbit provided by own gravity
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Graduate State Space Analyis - the 'B' matrix
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Graduate Calculation of a planet's mass via wavelengths
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Stargazing Spectra Optics telescope 1400X150 questions
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Graduate Comparing Sidereal & Synodic Reference Frames
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Graduate Electro-Gravity ideas, Dark Energy
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Graduate Surprising Gamma Rays From Crab Nebula
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Graduate Do all pulsars have a Pulsar wind nebula?
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Graduate What percentage of solar energy is converted to solar neutrinos?
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Undergrad How do neutrinos behave near a black hole?
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Graduate Arp 220 (UGC 9913, IC 4553) and Supernovae
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Graduate Converting spectrum into velocity space
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Graduate How Does Earth's Helical Trajectory Affect Its Calculated Speed Through Space?
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Undergrad Should space exploration be only the developed world’s adventure?
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Undergrad What are the requirements for interstellar travel at different speeds?
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High School Sun Angle: Differences by Season
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Graduate What Causes the Sinusoidal Waviness in UARS Orbital Altitudes?
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Undergrad Planet Hunters: First Two Planet Candidates Identified
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Graduate Unraveling the Mystery of Total Energy in the Universe
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Undergrad How Does Mass Affect Stellar Luminosity and Simulations?
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Graduate Found Another (Astrophysical) Error in Science Television
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Undergrad If center of galaxy is supermassive blackhole
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Undergrad Is gravity a weak force compared to other forces in the universe?
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High School How do measure and know about the vast scale of the Universe?
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Undergrad Help me to get the names of all stars with their declination?
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Graduate Creating a Sci-Fi World - Thea (Questions & Answers)
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Undergrad What is the centroid of the earth-moon system and how is it calculated?
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Graduate How does a very long object in space act with time
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Graduate Questions on Neutrinos: Mass, OPERA & More
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Undergrad Solar vs Lunar Tides: Explaining the Difference
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Graduate Why can't we see anything fall into the black hole?
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What is the longest lasting non-living thing in the universe?
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Undergrad Earth's Gravity if the Earth rotated the opposite direction
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Undergrad Black Hole Gravity at a Distance
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Graduate Something is broken about black hole theory
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Undergrad Would a Hot star have more mass than a cooler one?
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Graduate How to calculate mass of fuel needed to escape Earth gravity vs. Mars gravity
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Graduate Position of Ascending and Descending Nodes
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Undergrad Calculating energy from flux and max wavelength
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Stargazing Why is magnification defined as the ratio of eye and objective lens resolution?
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Undergrad Astronomy - Measure distance to other galaxies
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High School Why is the solar system, & galaxies seemingly rotate on a 2-D plane?
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Undergrad Gravitational Effects: How Jupiter Impacts Mars' Orbit
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Graduate Understanding Acoustic Peaks Beyond Last Scattering
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Graduate Propagating a Hyperbolic Trajectory
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Graduate Physical Difference in a Cepheid Variable
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Graduate Chandrasekhar limit & Tolman–Oppenheimer–Volkoff limit
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Graduate How close does a supernova has to be to be lethal?
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High School Will the red giant sun destroy the Earth?
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Stargazing Spatial and Angular Resolution of a Earth observing Telescope
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High School How Long Does VY Canis Majoris Have Left?
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High School Parallax and Perspective Explained
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Graduate How do massive stars like VY Canis not turn into black holes
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Graduate Question for Astronomers about the Equinoxes
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Is There a Smaller 2-Body System Than an Asteroid and Its Moon?
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Mysterious Red Areas in M33 Triangulum Galaxy
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Undergrad New Results From LHC/ light speed project
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High School According to our weather person, Fall starts on 9/23/11, How?
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High School Why Does the Moon's Position in the Sky Change Throughout the Month?
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Graduate Could a Splatnik be the solution to space debris?
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Graduate Why should radiation lead to loss in mass @ Black holes?
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Graduate Can We Achieve .99c for Interstellar Travel?
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Graduate Hard evidence for quasar lensing
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Graduate What Happens to Matter in a Black Hole?
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Undergrad How Do You Convert Pixel Number to Wavelength in a CCD Spectrum Analysis?
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Undergrad How to describe position of our solar system to some ETI in other galaxy?
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Stargazing House Appropriations Committee Kills James Webb Telescope
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Graduate Singularity or just a very small, massive shell?
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Time-lapse fly over planet Earth
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Graduate Does Acceleration of Matter Lead to Gravitational Dilation?
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M101 Supernova Magnitude: Current & Future
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Graduate What *would* the night sky look like if we could see the entire EM spectrum?
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Undergrad Size of planet with 1/50 gravity of earth
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High School What can gravitational waves teach us about the universe?
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Undergrad Astronomy - Main sequence and red giants
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Graduate Habitable zone planet discovered
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Graduate Difference between thermal and non-thermal Bremsstrahlung
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Graduate Messier 101 (The Pinwheel Galaxy) and SN 2011 fe (PTF 11kly)
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Undergrad What is the Area in Kepler's 2nd Law?
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