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 Loop bounce and geometric entropy (re: Bill A's question)
- marcus
- · Replies 6 ·
Undergrad Does the Universe Have a Center of Mass and Why Is It Expanding?
- kahwawashay1
- · Replies 26 ·
Undergrad How is the degree of vacuum in the Universe measured?
- Yuri B.
- · Replies 4 ·
Graduate Using Black holes to view our solar system
- elegysix
- · Replies 1 ·
Graduate Is there any way how to dispove that universe is a computer simulation?
- No-where-man
- · Replies 12 ·
Undergrad Understanding Very Long Baseline Interferometry: Is the Formula the Same as #2?
- s3a
- · Replies 6 ·
Graduate Is the Energy of the Universe Really Zero?
- da_willem
- · Replies 20 ·
Graduate Increasing the mass of the moon (via pancake theory)
- Princedragon
- · Replies 5 ·
Graduate What Causes Early Convective Instabilities in Supernova Explosions?
- Chronos
- · Replies 11 ·
Stargazing Why are Radio Telescopes less detailed?
- Vorde
- · Replies 5 ·
Stargazing Telescope for my astronomy class next semester
- HeLiXe
- · Replies 2 ·
Graduate Hubble constant depend on expansion model?
- johne1618
- · Replies 3 ·
Graduate Expanding Space: Explaining the Mystery
- cragar
- · Replies 4 ·
Graduate Are the Outer Bands of Galaxies Moving Faster Than the Speed of Light?
- DaddyJax
- · Replies 10 ·
Undergrad Our solar system and center of Milky way
- ahmediukas
- · Replies 7 ·
Graduate Failure to calculate equation of time and declination of the sun
- dwaynie
- · Replies 4 ·
Undergrad The Universe: A Mobius Strip of Possibilities?
- infinitea
- · Replies 2 ·
Graduate No Obvious Objects Produce Gamma Rays
- Dotini
- · Replies 3 ·
Undergrad Need a good textbook for astrophysics
- achuthan1988
- · Replies 1 ·
Undergrad Is Hubble Constant Really Constant?
- jayaramas
- · Replies 5 ·
Graduate Those Jets from the poles of black holes
- Daniel Batt
- · Replies 9 ·
Undergrad Newtons of an exploding Supernova
- Physics quest
- · Replies 14 ·
Graduate Need Help Settling a Debate About Guns in Space
- scorpiooooooh
- · Replies 8 ·
Undergrad Could an all water planet theorhetically exist?
- larrybud
- · Replies 20 ·
Have I seen the layers of parallel universes.
- datacloud
- · Replies 14 ·
Graduate Could a star survive a direct hit from a gamma ray burst?
- Astroboy123
- · Replies 13 ·
Graduate Space-time created ahead of matter - how far?
- Saddlestone
- · Replies 37 ·
Graduate Why Even Talk About Gravitons Even Existing?
- NYSportsguy
- · Replies 43 ·
Undergrad Converting RA & Dec into Normal Earth Surface Latitude & Longitude
- Gannet
- · Replies 14 ·
Graduate Nature of Dark Energy and a cracker in the sand
- Hammer76
- · Replies 21 ·
High School Queen's song '39 - the only pop song about relativity?
- Saddlestone
- · Replies 3 ·
Graduate How do black holes radiate if nothing can escape?
- 2sin54
- · Replies 4 ·
Graduate Need help understanding U.S. Naval Observatory's messed up algorithm
- dwaynie
- · Replies 7 ·
Undergrad Why Does Lithium Stay on the Surface of the Sun?
- sawtooth500
- · Replies 4 ·
Graduate Understanding the Universe: Explaining Light Speed and Expansion
- Ut-Napishtim
- · Replies 10 ·
Graduate Average value of sin(i) in radial velocities (exoplanets)
- cahill8
- · Replies 1 ·
Undergrad Force that the Earth exerts on the Moon
- Poppinkrey
- · Replies 7 ·
Graduate What are Cosmic Rays and How Can They Help Us Understand the Universe?
- Cluelessluke
- · Replies 1 ·
Graduate Reevaluating the Big Bang Theory: Challenging the 13.7 Billion Light Year Limit
- shashankac655
- · Replies 26 ·
I'm writing a novel involving worm holes and asteroids/meteors
- Haendelrsz
- · Replies 3 ·
Graduate How realistic is a time compression vacation destination with a high rate?
- nemorosa
- · Replies 11 ·
Graduate Conflict between reionization and the most distant object
- thenewmans
- · Replies 6 ·
Graduate Can Laser-Pushed Solar Sails Achieve Near Light Speed by Circling Back?
- udtsith
- · Replies 9 ·
High School What is a parallel universe and how does it relate to physics?
- VaibhavP
- · Replies 5 ·
Graduate Acceleration of two bodies in circular orbit provided by own gravity
- Ry122
- · Replies 2 ·
Graduate Why the early universe didn't collapse into a black hole?
- shazdeh
- · Replies 18 ·
Graduate State Space Analyis - the 'B' matrix
- phiby
- · Replies 2 ·
Undergrad Could Protons and Electrons Explain the Big Bang's Origins?
- aherrera
- · Replies 7 ·
Graduate Calculation of a planet's mass via wavelengths
- Poppinkrey
- · Replies 2 ·
Undergrad Effects of dark energy on our solar system
- VaibhavP
- · Replies 6 ·
Graduate Unveiling the Mystery of Antimatter Galaxies: Modern Cosmology's Perspective"
- Delta2
- · Replies 5 ·
Graduate Universe's full cycle: explosion - implosion
- Yuri B.
- · Replies 1 ·
Stargazing Spectra Optics telescope 1400X150 questions
- Gliese123
- · Replies 23 ·
Graduate Comparing Sidereal & Synodic Reference Frames
- Ry122
- · Replies 1 ·
Graduate Proof of Red Shift that indicates Expansion
- Buckeye
- · Replies 26 ·
Graduate Electro-Gravity ideas, Dark Energy
- happienumber
- · Replies 7 ·
Graduate Surprising Gamma Rays From Crab Nebula
- Dotini
- · Replies 4 ·
Graduate Do all pulsars have a Pulsar wind nebula?
- StephanJ
- · Replies 1 ·
Graduate What percentage of solar energy is converted to solar neutrinos?
- jayaramas
- · Replies 2 ·
Graduate Cyclic Universe - Fixed in Size but Divided into 8 Sections
- Buckeye
- · Replies 7 ·
Undergrad How do neutrinos behave near a black hole?
- jayaramas
- · Replies 5 ·
Graduate How many dimensions compose reality?
- Duhoc
- · Replies 15 ·
Graduate Dark matter or variable gravity?
- slooper2112
- · Replies 13 ·
Graduate Arp 220 (UGC 9913, IC 4553) and Supernovae
- Astronuc
- · Replies 1 ·
Graduate General relativity: a poor description of spacetime
- skylark53
- · Replies 10 ·
Graduate Converting spectrum into velocity space
- Piano man
- · Replies 5 ·
Graduate Explanation for gravity and mass?
- IvorGeorge
- · Replies 1 ·
Graduate How Does Earth's Helical Trajectory Affect Its Calculated Speed Through Space?
- TrickyDicky
- · Replies 6 ·
Undergrad Any difference between type 1a supernovae and a novae
- srikar97
- · Replies 8 ·
Undergrad Should space exploration be only the developed world’s adventure?
- shashankac655
- · Replies 113 ·
Undergrad What are the requirements for interstellar travel at different speeds?
- Jon0815
- · Replies 4 ·
Graduate What Are the Flaws in Stenger's Argument on the Origins of Order?
- bobsmith76
- · Replies 3 ·
Graduate Can Regular Matter and Dark Matter Be the Same Thing in Higher Dimensions?
- raid1000
- · Replies 1 ·
Graduate How do I measure the distance of a galaxy using conventional terms?
- Skolon
- · Replies 8 ·
High School Sun Angle: Differences by Season
- DaveC426913
- · Replies 14 ·
Graduate Greatest cosmic energy detected by Veritas
- TrickyDicky
- · Replies 1 ·
Graduate What is the Geometry of Spacetime Near the Big Bang?
- Imax
- · Replies 17 ·
Graduate How Can I Use the Two-Point Correlation Function to Compare Image Structures?
- mikeph
- · Replies 6 ·
Graduate What Causes the Sinusoidal Waviness in UARS Orbital Altitudes?
- jna
- · Replies 15 ·
Undergrad Planet Hunters: First Two Planet Candidates Identified
- Drakkith
- · Replies 2 ·
Graduate Unraveling the Mystery of Total Energy in the Universe
- Curious6
- · Replies 28 ·
Undergrad What is the relationship between dark matter and gravity?
- confused????
- · Replies 25 ·
Graduate Black Hole Radiation: Types, Perfect Blackbody & Collapsing Bodies
- khil_phys
- · Replies 26 ·
Undergrad How Does Mass Affect Stellar Luminosity and Simulations?
- jdlawlis
- · Replies 17 ·
Graduate Found Another (Astrophysical) Error in Science Television
- 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 Help me to get the names of all stars with their declination?
- purnendu.007
- · Replies 3 ·
Graduate Creating a Sci-Fi World - Thea (Questions & Answers)
- 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 Questions on Neutrinos: Mass, OPERA & More
- AlfreCabo
- · Replies 5 ·
Graduate Accurate distance gauge out to z ~ 4 alleged (AGN)
- marcus
- · Replies 3 ·