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 Dark energy alternative without MOND
- ZapperZ
- · Replies 37 ·
Graduate Revisiting Dark Matter Estimates in Axially Symmetric Galaxies
- wolram
- · Replies 2 ·
Graduate Plasma-redshift cosmology fits to SNLS supernovae data
- wolram
- · Replies 5 ·
Undergrad Questions of a Newbie: Iron Cores in Stars and Planets
- stunner5000pt
- · Replies 4 ·
High School Lightening on Mars? - Does Mars Have "Dusty Thunderstorms"?
- MonstersFromTheId
- · Replies 7 ·
Stargazing Can I Take Photos of Saturn and Galaxies with My Meade ETX70 Telescope?
- larkspur
- · Replies 9 ·
Graduate Measuring Vorticity in a Rotating Anisotropic Universe
- wolram
- · Replies 6 ·
Undergrad What computer science skills do astronomers need?
- Spacias
- · Replies 3 ·
Graduate Fine-Tuning from First Principles don't laugh
- island
- · Replies 1 ·
ESA extrasolar planet announcement 25 Jan 2018
- Vast
- · Replies 7 ·
High School Why Do Hubble Photos Have Black Squares?
- uknova
- · Replies 5 ·
What's the Latest on Space Elevators?
- sid_galt
- · Replies 18 ·
Undergrad Venus Synodic Period: Why 72 Degrees Away?
- darkar
- · Replies 1 ·
Graduate Some questions on star evolution
- fargoth
- · Replies 1 ·
Why does the general public show little interest in astrophysics?
- wolram
- · Replies 3 ·
Astrophysical Experiments Under Threat: Funding Cuts Ahead?
- wolram
- · Replies 2 ·
Graduate Discrepancies between planetary simulation software for May 5 1975
- DaveC426913
- · Replies 19 ·
Graduate What happens when two black holes collide?
- varsha
- · Replies 4 ·
Graduate Interstellar Travel: Theorical Force to Stabilize Wormhole
- lucasm1
- · Replies 2 ·
Graduate Could Gamma Radiation Bursts Be Evidence of Superluminal Travel?
- Jesse_Bonin
- · Replies 1 ·
Graduate Does a bounded universe require more dimensions?
- Vast
- · Replies 20 ·
Graduate Can planetoids repair complete fractures?
- Loren Booda
- · Replies 5 ·
Graduate Black holes as seeds for new universes
- JBash
- · Replies 2 ·
Graduate Dark matter minimum size from particle velocity constraints
- marcus
- · Replies 15 ·
Graduate How does the accelerating expansion rate affect the Hubble Constant?
- porquat
- · Replies 2 ·
Graduate Is the cosmological constant a force or spacetime distortion?
- Gerinski
- · Replies 2 ·
Undergrad Expanding Galaxies: Man Asks Question
- varsha
- · Replies 1 ·
Graduate Do dark matter and dark energy affect orbital dynamics?
- ubavontuba
- · Replies 23 ·
Stargazing What can be upgraded on a Meade StarQuest 60AZ-M telescope?
- vincentm
- · Replies 22 ·
High School Why Don't Particles in the Sun's Center Reach Absolute Zero?
- Thickman
- · Replies 4 ·
Graduate Can a Black Hole Self-Destruct?
- rcgldr
- · Replies 2 ·
Graduate Could life exist inside a black hole?
- ubavontuba
- · Replies 65 ·
Graduate Difference between particle horizon and cosmological event horizon?
- touqra
- · Replies 5 ·
Graduate Seeing the edge of an unbounded, closed universe
- DaveC426913
- · Replies 10 ·
Graduate Universe be determined by some average per volume temperature ?
- wolram
- · Replies 1 ·
Graduate DM Halo Movement: Predicted vs Observed
- jhe1984
- · Replies 3 ·
Graduate Does spin approach infinity as a collapsing object shrinks toward singularity?
- tony873004
- · Replies 7 ·
Can space be perceived in more then one way?
- Nicole K
- · Replies 20 ·
Graduate Cosmological Constant and the like
- blumfeld0
- · Replies 1 ·
High School Why does 2003 UB313's designation not match its October 21 discovery date?
- tony873004
- · Replies 2 ·
Graduate How does the orbital diameter of 2003 UB313 compare to its orbital period?
- DaveC426913
- · Replies 1 ·
Graduate Extremely bright flash 50,000 light-years away on Dec 27 2004
- Agent C.I
- · Replies 3 ·
High School Why sun looks bigger in the evening?
- En_lizard
- · Replies 11 ·
High School What is a graph of spectra called: spectrograph or spectragraph?
- UrbanXrisis
- · Replies 7 ·
Undergrad How long does it take for a system to reach equilibrium?
- Ely Rajo
- · Replies 16 ·
Graduate What Causes the Enigmatic Black Aurora Phenomenon?
- Ivan Seeking
- · Replies 2 ·
High School BVRIJHK Photometry: What Do the Letters Stand For?
- tony873004
- · Replies 3 ·
Graduate Schechter Function of Galaxy Luminosity-Density relationship
- sderamus
- · Replies 1 ·
Graduate Could a Planet Gain Mass and Ignite as a Star?
- ThomasFuhlery
- · Replies 3 ·
Graduate Has Lightspeed Changed Over Billions of Years?
- Anders Lundberg
- · Replies 4 ·
Graduate Did Simon Singh get stumped at the end of his Big Bang lecture?
- jhe1984
- · Replies 5 ·
Graduate Could We See the Edge of the Universe?
- Wings of Pegasus
- · Replies 31 ·
Graduate We all love to prove things [spectral broadening/relativity]
- fasterthanjoao
- · Replies 3 ·
Undergrad Undergrad: General Astronomy Questions.
- fasterthanjoao
- · Replies 3 ·
Graduate Is Dark Energy+Matter product of quantum particle-pair creation?
- CosmologyHobbyist
- · Replies 1 ·
Graduate Dark galaxy with no stars detected by radio emissions and gravity
- DaveC426913
- · Replies 49 ·
Graduate Is Time Measured Differently During the Big Bang?
- alkammy
- · Replies 9 ·
High School What is inflationary theory and how does it relate to the big bang?
- vincentm
- · Replies 1 ·
Graduate What is at the Edge of a Closed Universe?
- Monoxide
- · Replies 4 ·
Undergrad How do we get pictures of the Milky Way if we're inside it?
- |Orion's Thought|
- · Replies 13 ·
Graduate Urr, this doesn't seem like it should be very hard but well, good 'ol me
- schattenjaeger
- · Replies 4 ·
Why Are Two Stars Leaving Our Galaxy?
- varsha
- · Replies 3 ·
Undergrad Could something be seen going the speed of light?
- |Orion's Thought|
- · Replies 4 ·
High School Variable Stars: What Causes Their Brightness to Vary?
- varsha
- · Replies 1 ·
Graduate What causes the light pulsations of Cepheid variables?
- Leonardo Sidis
- · Replies 8 ·
Undergrad So, what would happen if a comet the size of our moon collided with Venus?
- psksvp
- · Replies 10 ·
VERY high resolution Cassini photos?
- chroot
- · Replies 2 ·
Undergrad How can photons be particles if they have no mass?
- Ange de L'inconnu
- · Replies 7 ·
Graduate The Pioneer Anomaly: A Doppler Shift Explanation
- marcus
- · Replies 12 ·
High School Is Everything in the Universe Defined by Opposites?
- Wings of Pegasus
- · Replies 11 ·
Graduate Black holes: best candidate for dark matter?
- Loren Booda
- · Replies 2 ·
Does the Universe Have a Mind of Its Own?
- van gogh
- · Replies 142 ·
Graduate What Are the Sources and Generation Methods of Neutrinos?
- BigStelly
- · Replies 3 ·
Undergrad Small comets delivering water to Earth's atmosphere
- John L
- · Replies 8 ·
Graduate Hawking radiation, Is it possible?
- Upisoft
- · Replies 20 ·
Have you seen the hilariously bad movie, Plan 9 from Outer Space?
- Azael
- · Replies 2 ·
Graduate Can Hyper-Velocity Stars Illuminate the Structure of the Galactic Halo?
- Garth
- · Replies 2 ·
Universe Today PDF: Interested in Astronomy?
- cscott
- · Replies 1 ·
Graduate Does gravity pull back radiation emitted in the Big Bang?
- trichop
- · Replies 10 ·
Graduate Is the Universe Flat or Does it Have a Height?
- jhe1984
- · Replies 5 ·
Undergrad Did galaxies form from preformed structures or coalesce over time?
- Wings of Pegasus
- · Replies 6 ·
Graduate Could space-time develop tears during cosmic inflation?
- Frizz
- · Replies 2 ·
Graduate Cosmic Microwave Background primer
- Chronos
- · Replies 7 ·
Roving Mars: IMAX movie coming soon
- Ivan Seeking
- · Replies 2 ·
Graduate A question related to cosmology( or perhaps philosophy)
- kant
- · Replies 13 ·
Graduate Dating techniques for our universe
- nnxion
- · Replies 2 ·
Graduate Do quasar redshift anomalies challenge mainstream theories?
- lezardo
- · Replies 10 ·
High School Has Dark Matter Been Found and Does It Bend Light?
- touqra
- · Replies 2 ·
Undergrad How Do We Calculate the Weight of Celestial Bodies in the Solar System?
- Blahness
- · Replies 4 ·
Graduate Stellar evolution of massive stars at very low metallicities
- Chronos
- · Replies 1 ·
Undergrad Is the Sun's Core Really Made of Iron?
- /0
- · Replies 6 ·
Graduate Terrestrial planet search review paper
- marcus
- · Replies 1 ·
Graduate How do massive planets eject smaller planets during formation?
- topito2
- · Replies 2 ·
Undergrad Horizons Mission: How Will the New Horizons Probe Leave the Solar System?
- Nacho
- · Replies 2 ·
Graduate CMBR as an absolute reference frame
- Dorje
- · Replies 2 ·
Undergrad Gravitational flux in solar system?
- jhe1984
- · Replies 6 ·
Undergrad Equitorial/Horizontal co-ordinate questions
- Brewer
- · Replies 6 ·
High School Air baloon and came back down about 12 hours later
- gm5170
- · Replies 6 ·
Undergrad Do black holes really vaporize through Hawking radiation?
- varsha
- · Replies 8 ·
Graduate Important Findings on Dark Matter
- franznietzsche
- · Replies 12 ·