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 What causes the sinusoidal waviness in UARS orbital altitudes below 570 km?
- jna
- · Replies 15 ·
Undergrad Planet Hunters: First Two Planet Candidates Identified
- Drakkith
- · Replies 2 ·
Graduate Is the total energy of the universe zero?
- Curious6
- · Replies 28 ·
Undergrad Could dark matter be part of gravity rather than undiscovered particles?
- confused????
- · Replies 25 ·
Graduate Does a black hole radiate like a perfect blackbody and release information?
- khil_phys
- · Replies 26 ·
Undergrad Does stellar luminosity scale with mass cubed or to the fourth power?
- jdlawlis
- · Replies 17 ·
Graduate Does 'How the Universe Works' err about atoms in our bodies forming in stars?
- BadBrain
- · Replies 13 ·
Undergrad If center of galaxy is supermassive blackhole
- Chitose
- · Replies 28 ·
Undergrad Is gravity a weak force compared to other forces in the universe?
- GRAViL59
- · Replies 17 ·
Graduate Wasn't the universe more disordered in the past?
- zeromodz
- · Replies 4 ·
Graduate Info on the supernova accelerating space Nobel prize.
- Agerhell
- · Replies 2 ·
Graduate What are the limits of redshift?
- Lost in Space
- · Replies 9 ·
Graduate Photons vs neutrinos energy ratio
- Calimero
- · Replies 4 ·
High School How do measure and know about the vast scale of the Universe?
- kyler.e
- · Replies 6 ·
Undergrad Finding circumpolar stars visible from 26°28'12"N latitude
- purnendu.007
- · Replies 3 ·
Graduate Physics for a sci-fi moon: orbital stability, atmosphere, and aerodynamics
- MattRob
- · Replies 11 ·
Undergrad What is the centroid of the earth-moon system and how is it calculated?
- Ry122
- · Replies 4 ·
Graduate Is it practically possible to look back in time?
- Sobadzhiev
- · Replies 11 ·
Graduate How does a very long object in space act with time
- d3nd3
- · Replies 7 ·
Graduate There is more meaning in the universe than there is matter
- treehouse
- · Replies 1 ·
Graduate Why do neutrinos pass through matter while photons don't?
- AlfreCabo
- · Replies 5 ·
Graduate Accurate distance gauge out to z ~ 4 alleged (AGN)
- marcus
- · Replies 3 ·
Undergrad Why are lunar tides stronger than solar tides if the Sun's gravity is stronger?
- The Head
- · Replies 3 ·
Graduate From time to timescape – Einstein’s unfinished revolution?
- Garth
- · Replies 74 ·
Graduate Does space expand preferentially into low-density regions?
- keepit
- · Replies 14 ·
Graduate Is the universe necessarily infinite if it's expanding?
- pedersean
- · Replies 47 ·
Graduate Why can't we see anything fall into the black hole?
- Sarcastic14
- · Replies 1 ·
What is the Big Rip theory?
- 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 If the Big Bang occurs at the first moment of time, how can there be a multiverse?
- 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 do solar systems and galaxies rotate in flat planes?
- 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 Why did we move farther than light from the big bang?
- mak_phy
- · Replies 7 ·
Graduate Physical Difference in a Cepheid Variable
- Vorde
- · Replies 3 ·
Graduate Why does the Tolman–Oppenheimer–Volkoff limit exceed the Chandrasekhar 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 Why distant objects appear to follow you while nearby ones move opposite
- 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 ·
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 Building a spacecraft to reach 0.99c 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 Does infalling matter reach the singularity or form a 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 ·
What's the current magnitude of the M101 supernova?
- 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 HD 85512 b habitable zone planet discovery
- 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 What observations verify the existence of cosmic dust?
- 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 Does CMB dipole anisotropy imply absolute motion and a preferred reference frame?
- profgemelli
- · Replies 20 ·
High School How do we know everything in the universe is made of atoms?
- TehEpicness
- · Replies 13 ·
Kepler-16b: planet orbiting two stars
- Imax
- · Replies 3 ·
Graduate Supermassive BH feeding on Dark matter
- Dmitry67
- · Replies 8 ·