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.
Threads
Graduate From time to timescape – Einstein’s unfinished revolution?
- Garth
- · Replies 74 ·
Graduate How Does Accelerating Expansion Affect Space Density and Interjection?
- keepit
- · Replies 14 ·
Graduate The universe's size : always infinite?
- pedersean
- · Replies 47 ·
Graduate Why can't we see anything fall into the black hole?
- Sarcastic14
- · Replies 1 ·
Discussing the Big Rip Theory: Have You Heard About It?
- Joe L. Ogan
- · Replies 10 ·
Graduate More on faster than light neutinos
- wolram
- · Replies 1 ·
Graduate How Should We Visualize Dark Matter Around Spiral Galaxies?
- ryan albery
- · Replies 2 ·
What is the longest lasting non-living thing in the universe?
- apathyinlife
- · Replies 5 ·
Graduate Existance of time before big bang
- dhruv mishra
- · Replies 31 ·
Undergrad Earth's Gravity if the Earth rotated the opposite direction
- rogersjc
- · Replies 4 ·
Graduate Big Bang or Multiverse: Which Theory Explains Our Universe Better?
- Nervous
- · Replies 10 ·
Undergrad Black Hole Gravity at a Distance
- Sothh
- · Replies 1 ·
Graduate Something is broken about black hole theory
- x_engineer
- · Replies 15 ·
Undergrad Would a Hot star have more mass than a cooler one?
- ArmoSkater87
- · Replies 13 ·
Graduate How to calculate mass of fuel needed to escape Earth gravity vs. Mars gravity
- jhochstein
- · Replies 2 ·
Graduate Position of Ascending and Descending Nodes
- TheHarvesteR
- · Replies 3 ·
Undergrad Calculating energy from flux and max wavelength
- ShalinNayak
- · Replies 1 ·
Stargazing Why is magnification defined as the ratio of eye and objective lens resolution?
- Marketo
- · Replies 4 ·
Undergrad Astronomy - Measure distance to other galaxies
- tosv
- · Replies 9 ·
High School Why is the solar system, & galaxies seemingly rotate on a 2-D plane?
- Techno-Raver
- · Replies 10 ·
Graduate Can cosmologist mathematicians compute all the way to absolute nothingness?
- yrreg
- · Replies 40 ·
Undergrad Gravitational Effects: How Jupiter Impacts Mars' Orbit
- Frannas
- · Replies 3 ·
Graduate Understanding Acoustic Peaks Beyond Last Scattering
- superg33k
- · Replies 5 ·
Graduate Propagating a Hyperbolic Trajectory
- TheHarvesteR
- · Replies 4 ·
Undergrad Could gravity be a convergence of waves?
- cookertron
- · Replies 3 ·
Graduate How Does the Empire State Building Help Us Understand the Big Bang?
- mak_phy
- · Replies 7 ·
Graduate Physical Difference in a Cepheid Variable
- Vorde
- · Replies 3 ·
Graduate Chandrasekhar limit & Tolman–Oppenheimer–Volkoff limit
- Astro.padma
- · Replies 11 ·
Graduate How close does a supernova has to be to be lethal?
- SubTachyon
- · Replies 5 ·
High School Will the red giant sun destroy the Earth?
- Dremmer
- · Replies 11 ·
Stargazing Spatial and Angular Resolution of a Earth observing Telescope
- CJSGrailKnigh
- · Replies 5 ·
High School How Long Does VY Canis Majoris Have Left?
- Newtons Apple
- · Replies 3 ·
Graduate Link between Universe mass density and Cosmic Microwave Background energy
- johne1618
- · Replies 3 ·
High School Parallax and Perspective Explained
- peter.ell
- · Replies 2 ·
Graduate How do massive stars like VY Canis not turn into black holes
- blarznik
- · Replies 6 ·
Graduate Question for Astronomers about the Equinoxes
- brocks
- · Replies 4 ·
Is There a Smaller 2-Body System Than an Asteroid and Its Moon?
- wolram
- · Replies 2 ·
Mysterious Red Areas in M33 Triangulum Galaxy
- Drakkith
- · Replies 13 ·
Undergrad New Results From LHC/ light speed project
- brother time
- · Replies 2 ·
High School According to our weather person, Fall starts on 9/23/11, How?
- Gannet
- · Replies 4 ·
High School Why Does the Moon's Position in the Sky Change Throughout the Month?
- Jim Ross
- · Replies 7 ·
Graduate Could a Splatnik be the solution to space debris?
- Tandem78
- · Replies 4 ·
Graduate Why should radiation lead to loss in mass @ Black holes?
- Astro.padma
- · Replies 5 ·
Graduate Can We Achieve .99c for Interstellar Travel?
- cjackson
- · Replies 47 ·
Graduate Hard evidence for quasar lensing
- deSitter
- · Replies 2 ·
Graduate What Happens to Matter in a Black Hole?
- Laywoman
- · Replies 75 ·
Graduate Does spacelike separation have anything to do with non-locality?
- dst
- · Replies 1 ·
Undergrad How Do You Convert Pixel Number to Wavelength in a CCD Spectrum Analysis?
- jaykob_hxc
- · Replies 3 ·
Undergrad How to describe position of our solar system to some ETI in other galaxy?
- samnathan
- · Replies 7 ·
Stargazing House Appropriations Committee Kills James Webb Telescope
- signerror
- · Replies 38 ·
Graduate Singularity or just a very small, massive shell?
- em370
- · Replies 31 ·
Graduate Quantum Fluctuations and the Origin of the Cosmic Microwave Background Radiation
- Orion1
- · Replies 2 ·
Time-lapse fly over planet Earth
- Orion1
- · Replies 1 ·
Graduate Does Acceleration of Matter Lead to Gravitational Dilation?
- tvscientist
- · Replies 21 ·
Graduate Gigantic Black Holes vs White Holes: How Can We Know?
- profgemelli
- · Replies 5 ·
M101 Supernova Magnitude: Current & Future
- DaveC426913
- · Replies 19 ·
Graduate What *would* the night sky look like if we could see the entire EM spectrum?
- SeventhSigma
- · Replies 11 ·
Undergrad Size of planet with 1/50 gravity of earth
- YummyFur
- · Replies 28 ·
Graduate Is the Expanding Universe Theory Reversed? A Scientist's Perspective
- razorheno
- · Replies 19 ·
Undergrad How do they know what happened in the first second
- bobsmith76
- · Replies 8 ·
Dwarf galaxies suggest dark matter theories may be wrong
- phinds
- · Replies 5 ·
High School What can gravitational waves teach us about the universe?
- sankaDM
- · Replies 3 ·
Undergrad Astronomy - Main sequence and red giants
- tosv
- · Replies 3 ·
Graduate Habitable zone planet discovered
- Orion1
- · Replies 18 ·
Graduate Difference between thermal and non-thermal Bremsstrahlung
- kop442000
- · Replies 3 ·
Graduate Messier 101 (The Pinwheel Galaxy) and SN 2011 fe (PTF 11kly)
- IonicOne
- · Replies 2 ·
Undergrad What is the Area in Kepler's 2nd Law?
- uppaladhadium
- · Replies 1 ·
Undergrad Detecting Cosmic Dust: The Challenges and Solutions
- tosv
- · Replies 6 ·
Undergrad Intelligent life in the universe
- AdamMc85
- · Replies 1 ·
Undergrad Orbits, ellipitical, circular, or ?
- flyingpig
- · Replies 2 ·
Graduate Sunspots, areas of intense magnetic fields.
- chemisttree
- · Replies 9 ·
Undergrad Will the earth and sun ever be tidally locked?
- ARAVIND113122
- · Replies 16 ·
Where can I find captivating videos for my Big Bang presentation?
- rohlrogge
- · Replies 1 ·
Graduate The Mystery of CMB Polar Anisotropy and its Implications on Cosmology
- profgemelli
- · Replies 20 ·
High School How do we know everything in the universe is made of atoms?
- TehEpicness
- · Replies 13 ·
NASA Discovers Planet With 2 Suns
- Imax
- · Replies 3 ·
Graduate Supermassive BH feeding on Dark matter
- Dmitry67
- · Replies 8 ·
Graduate What is the significance of Eq. 15 in the expansion of HII regions?
- matteo86bo
- · Replies 4 ·
Graduate Space Elevator: Magnitized Cable for Supersonic Travel
- Vinni
- · Replies 14 ·
Graduate Gravitational Waves: Interfering, Diffracting & More
- Drakkith
- · Replies 20 ·
A Look Back at Aerospace Innovations: Celebrating National Aerospace Week
- BobG
- · Replies 1 ·
What Makes an Effective Astrophysics Blog?
- Astro.padma
- · Replies 2 ·
Undergrad Example of a mass orbiting more massive, less luminous body?
- Deadstar
- · Replies 4 ·
High School Can a Planet Explode Like a Star?
- flyingpig
- · Replies 31 ·
Graduate Gravity: How Does Spacetime Bend?
- cueball B
- · Replies 7 ·
Graduate Vega. Are Sol and Vega destined to collide?
- twistedspark
- · Replies 4 ·
High School Kepler 16-b: first circumbinary planet?
- arjose
- · Replies 6 ·
Graduate Unify Fields in Big Bang: Quest for Origin
- easyrider
- · Replies 11 ·
Undergrad Can a sun rise and set on the same horizon?
- Razorback-PT
- · Replies 15 ·
New 3D model of solar system and night sky
- Mito111
- · Replies 9 ·
Undergrad Has anyone tried Victor Stenger's MonkeyGod toy universe program?
- marcus
- · Replies 3 ·
Graduate Can infinity fit in the palm of your hand
- YummyFur
- · Replies 34 ·
Graduate Effect of lunar/solar gravity on shape of earth
- daniel6874
- · Replies 86 ·
Colourful moon dog observed, or what?
- arildno
- · Replies 2 ·
Graduate Why Do Scalar Fields in Hybrid Inflation Model Diverge with Large Mixing Term?
- Accidently
- · Replies 5 ·
Graduate I would like to know more about the beginning of time in terms of
- nard
- · Replies 1 ·
Undergrad An impractical but difficult problem I stumbled upon
- bigmoneyhat
- · Replies 2 ·
Undergrad Mass of the core of the sun > mass of the sun?
- h1a8
- · Replies 3 ·
Graduate What would happen if two Earth size planets very slowly collided?
- blarznik
- · Replies 19 ·
Graduate Gravitational Variances in Space
- Maximilan
- · Replies 6 ·