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.
Discussing the Big Rip Theory: Have You Heard About It?
  • Joe L. Ogan
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Graduate More on faster than light neutinos
  • wolram
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Graduate How Should We Visualize Dark Matter Around Spiral Galaxies?
  • ryan albery
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What is the longest lasting non-living thing in the universe?
  • apathyinlife
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Graduate Existance of time before big bang
  • dhruv mishra
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Undergrad Earth's Gravity if the Earth rotated the opposite direction
  • rogersjc
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Graduate Big Bang or Multiverse: Which Theory Explains Our Universe Better?
  • Nervous
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Undergrad Black Hole Gravity at a Distance
  • Sothh
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Graduate Something is broken about black hole theory
  • x_engineer
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Undergrad Would a Hot star have more mass than a cooler one?
  • ArmoSkater87
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Graduate How to calculate mass of fuel needed to escape Earth gravity vs. Mars gravity
  • jhochstein
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Graduate Position of Ascending and Descending Nodes
  • TheHarvesteR
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Undergrad Calculating energy from flux and max wavelength
  • ShalinNayak
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Stargazing Why is magnification defined as the ratio of eye and objective lens resolution?
  • Marketo
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Undergrad Astronomy - Measure distance to other galaxies
  • tosv
  • · Replies 9 ·
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High School Why is the solar system, & galaxies seemingly rotate on a 2-D plane?
  • Techno-Raver
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Graduate Can cosmologist mathematicians compute all the way to absolute nothingness?
  • yrreg
  • · Replies 40 ·
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Undergrad Gravitational Effects: How Jupiter Impacts Mars' Orbit
  • Frannas
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Graduate Understanding Acoustic Peaks Beyond Last Scattering
  • superg33k
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Graduate Propagating a Hyperbolic Trajectory
  • TheHarvesteR
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Undergrad Could gravity be a convergence of waves?
  • cookertron
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Graduate How Does the Empire State Building Help Us Understand the Big Bang?
  • mak_phy
  • · Replies 7 ·
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Graduate Physical Difference in a Cepheid Variable
  • Vorde
  • · Replies 3 ·
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Graduate Chandrasekhar limit & Tolman–Oppenheimer–Volkoff limit
  • Astro.padma
  • · Replies 11 ·
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Graduate How close does a supernova has to be to be lethal?
  • SubTachyon
  • · Replies 5 ·
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High School Will the red giant sun destroy the Earth?
  • Dremmer
  • · Replies 11 ·
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Stargazing Spatial and Angular Resolution of a Earth observing Telescope
  • CJSGrailKnigh
  • · Replies 5 ·
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High School How Long Does VY Canis Majoris Have Left?
  • Newtons Apple
  • · Replies 3 ·
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Graduate Link between Universe mass density and Cosmic Microwave Background energy
  • johne1618
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High School Parallax and Perspective Explained
  • peter.ell
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Graduate How do massive stars like VY Canis not turn into black holes
  • blarznik
  • · Replies 6 ·
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Graduate Question for Astronomers about the Equinoxes
  • brocks
  • · Replies 4 ·
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Is There a Smaller 2-Body System Than an Asteroid and Its Moon?
  • wolram
  • · Replies 2 ·
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Mysterious Red Areas in M33 Triangulum Galaxy
  • Drakkith
  • · Replies 13 ·
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Undergrad New Results From LHC/ light speed project
  • brother time
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High School According to our weather person, Fall starts on 9/23/11, How?
  • Gannet
  • · Replies 4 ·
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High School Why Does the Moon's Position in the Sky Change Throughout the Month?
  • Jim Ross
  • · Replies 7 ·
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Graduate Could a Splatnik be the solution to space debris?
  • Tandem78
  • · Replies 4 ·
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Graduate Why should radiation lead to loss in mass @ Black holes?
  • Astro.padma
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Graduate Can We Achieve .99c for Interstellar Travel?
  • cjackson
  • · Replies 47 ·
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Graduate Hard evidence for quasar lensing
  • deSitter
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Graduate What Happens to Matter in a Black Hole?
  • Laywoman
  • · Replies 75 ·
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Graduate Does spacelike separation have anything to do with non-locality?
  • dst
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Undergrad How Do You Convert Pixel Number to Wavelength in a CCD Spectrum Analysis?
  • jaykob_hxc
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Undergrad How to describe position of our solar system to some ETI in other galaxy?
  • samnathan
  • · Replies 7 ·
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Stargazing House Appropriations Committee Kills James Webb Telescope
  • signerror
  • · Replies 38 ·
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Graduate Singularity or just a very small, massive shell?
  • em370
  • · Replies 31 ·
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Graduate Quantum Fluctuations and the Origin of the Cosmic Microwave Background Radiation
  • Orion1
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Time-lapse fly over planet Earth
  • Orion1
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Graduate Does Acceleration of Matter Lead to Gravitational Dilation?
  • tvscientist
  • · Replies 21 ·
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Graduate Gigantic Black Holes vs White Holes: How Can We Know?
  • profgemelli
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M101 Supernova Magnitude: Current & Future
  • DaveC426913
  • · Replies 19 ·
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Graduate What *would* the night sky look like if we could see the entire EM spectrum?
  • SeventhSigma
  • · Replies 11 ·
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Undergrad Size of planet with 1/50 gravity of earth
  • YummyFur
  • · Replies 28 ·
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Graduate Is the Expanding Universe Theory Reversed? A Scientist's Perspective
  • razorheno
  • · Replies 19 ·
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Undergrad How do they know what happened in the first second
  • bobsmith76
  • · Replies 8 ·
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Dwarf galaxies suggest dark matter theories may be wrong
  • phinds
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High School What can gravitational waves teach us about the universe?
  • sankaDM
  • · Replies 3 ·
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Undergrad Astronomy - Main sequence and red giants
  • tosv
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Graduate Habitable zone planet discovered
  • Orion1
  • · Replies 18 ·
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Graduate Difference between thermal and non-thermal Bremsstrahlung
  • kop442000
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Graduate Messier 101 (The Pinwheel Galaxy) and SN 2011 fe (PTF 11kly)
  • IonicOne
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Undergrad What is the Area in Kepler's 2nd Law?
  • uppaladhadium
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Undergrad Detecting Cosmic Dust: The Challenges and Solutions
  • tosv
  • · Replies 6 ·
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Undergrad Intelligent life in the universe
  • AdamMc85
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Undergrad Orbits, ellipitical, circular, or ?
  • flyingpig
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Graduate Sunspots, areas of intense magnetic fields.
  • chemisttree
  • · Replies 9 ·
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Undergrad Will the earth and sun ever be tidally locked?
  • ARAVIND113122
  • · Replies 16 ·
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Where can I find captivating videos for my Big Bang presentation?
  • rohlrogge
  • · Replies 1 ·
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Graduate The Mystery of CMB Polar Anisotropy and its Implications on Cosmology
  • profgemelli
  • · Replies 20 ·
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High School How do we know everything in the universe is made of atoms?
  • TehEpicness
  • · Replies 13 ·
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NASA Discovers Planet With 2 Suns
  • Imax
  • · Replies 3 ·
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Graduate Supermassive BH feeding on Dark matter
  • Dmitry67
  • · Replies 8 ·
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Graduate What is the significance of Eq. 15 in the expansion of HII regions?
  • matteo86bo
  • · Replies 4 ·
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Graduate Space Elevator: Magnitized Cable for Supersonic Travel
  • Vinni
  • · Replies 14 ·
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Graduate Gravitational Waves: Interfering, Diffracting & More
  • Drakkith
  • · Replies 20 ·
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A Look Back at Aerospace Innovations: Celebrating National Aerospace Week
  • BobG
  • · Replies 1 ·
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What Makes an Effective Astrophysics Blog?
  • Astro.padma
  • · Replies 2 ·
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Undergrad Example of a mass orbiting more massive, less luminous body?
  • Deadstar
  • · Replies 4 ·
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High School Can a Planet Explode Like a Star?
  • flyingpig
  • · Replies 31 ·
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Graduate Gravity: How Does Spacetime Bend?
  • cueball B
  • · Replies 7 ·
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Graduate Vega. Are Sol and Vega destined to collide?
  • twistedspark
  • · Replies 4 ·
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High School Kepler 16-b: first circumbinary planet?
  • arjose
  • · Replies 6 ·
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Graduate Unify Fields in Big Bang: Quest for Origin
  • easyrider
  • · Replies 11 ·
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Undergrad Can a sun rise and set on the same horizon?
  • Razorback-PT
  • · Replies 15 ·
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New 3D model of solar system and night sky
  • Mito111
  • · Replies 9 ·
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Undergrad Has anyone tried Victor Stenger's MonkeyGod toy universe program?
  • marcus
  • · Replies 3 ·
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Graduate Can infinity fit in the palm of your hand
  • YummyFur
  • · Replies 34 ·
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Graduate Effect of lunar/solar gravity on shape of earth
  • daniel6874
  • · Replies 86 ·
3
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Colourful moon dog observed, or what?
  • arildno
  • · Replies 2 ·
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Graduate Why Do Scalar Fields in Hybrid Inflation Model Diverge with Large Mixing Term?
  • Accidently
  • · Replies 5 ·
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Graduate I would like to know more about the beginning of time in terms of
  • nard
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Undergrad An impractical but difficult problem I stumbled upon
  • bigmoneyhat
  • · Replies 2 ·
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Undergrad Mass of the core of the sun > mass of the sun?
  • h1a8
  • · Replies 3 ·
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Graduate What would happen if two Earth size planets very slowly collided?
  • blarznik
  • · Replies 19 ·
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Graduate Gravitational Variances in Space
  • Maximilan
  • · Replies 6 ·
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Graduate How does the expansion of the universe stretch light?
  • Peter Watkins
  • · Replies 57 ·
2
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Graduate Where are the future background microwaves now
  • YummyFur
  • · Replies 5 ·
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5
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Graduate The destruction of matter due to spaghettification
  • Kamon2011
  • · Replies 6 ·
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Undergrad The gravitational tug of the Sun and the Moon on Earth - a question
  • shirvanshah
  • · Replies 4 ·
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