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 Difference between protogalactic clouds and protogalaxies
- sadeghi94
- · Replies 2 ·
Undergrad Is the Big Bang the Only Explanation for the Universe's Nature?
- Godswitch
- · Replies 21 ·
Graduate Some repetitive mistakes and misconceptions about DM, MOND, TeVeS, and cosmology
- juanrga
- · Replies 1 ·
Graduate Simple proof that the zero-point energy spectrum is Lorentz Invariant?
- johne1618
- · Replies 3 ·
Graduate Can a Particle with Repulsive Properties Explain Dark Matter and Dark Energy?
- E45
- · Replies 28 ·
Graduate Particle horizon in Lemaître model
- EhsanZ
- · Replies 1 ·
High School Martian Pole Star: Same as Earth's?
- m~ray
- · Replies 6 ·
Undergrad Are Black Holes Proven or Just Theoretical Constructs?
- stglyde
- · Replies 36 ·
Graduate Can Space Warp Independently of Mass?
- Buckethead
- · Replies 13 ·
Undergrad Why the universe is expanding faster and faster
- enricfemi
- · Replies 49 ·
Graduate Is the total energy of the universe positive, zero, or negative?
- physixer
- · Replies 5 ·
Undergrad Are supermassive black holes just big stars?
- Singlecoil
- · Replies 11 ·
Graduate Can the Universe's Path be Definitively Determined?
- jam.muskopf
- · Replies 16 ·
Graduate Did time exist before the big bang?
- Willis666
- · Replies 21 ·
Undergrad Is Black Hole Gravity Strong Enough to Crush Earth into a Watermelon?
- 3112100000
- · Replies 2 ·
High School What Causes Sunspots and How Do They Affect Solar Brightness?
- ahaanomegas
- · Replies 6 ·
Undergrad Can Scientists Capture Images of Distant Stars Like Betelgeuse?
- thetexan
- · Replies 6 ·
Undergrad Neutron star and white dwarf material
- mathman
- · Replies 9 ·
Undergrad If you leave Earth traveling at .01c can you reach Saturn in 6 days?
- cjackson
- · Replies 2 ·
Graduate What Causes the Expansion of the Universe?
- wolram
- · Replies 9 ·
Supernova SN 2011fe Still Alive and Kicking
- Drakkith
- · Replies 10 ·
Graduate The resulting mass of the remnant of a core-collapse SN
- bendaten
- · Replies 10 ·
Undergrad I think the universe is slowing down not speeding up
- Vincent Neave
- · Replies 12 ·
Graduate Causal entropic principle / entropic principle
- dmtr
- · Replies 1 ·
Graduate Black Holes: Falling in and Looking out?
- FGLC Nate
- · Replies 10 ·
Graduate Data to derive Hubble's constant
- Bojje
- · Replies 2 ·
Graduate What is the current understanding of the galactic magnetic field?
- korben dallas
- · Replies 16 ·
Undergrad Could Telescopes Ever Capture Detailed Images of Exoplanet Surfaces?
- hiddenvariabl
- · Replies 19 ·
High School Why is There Space in the Universe?
- mgervasoni
- · Replies 24 ·
Graduate Did Matter Really Exceed the Speed of Light During the Big Bang?
- studentxlol
- · Replies 2 ·
Graduate Black Hole Temperature: Stephen Hawking Equation & Calculation Results
- sabanation12
- · Replies 6 ·
High School Kepler22b-first exoplanet found in hab-zone of sun-like star
- marcus
- · Replies 37 ·
Undergrad AU and the Circumstellar Habitable Zone
- Hanne
- · Replies 2 ·
Graduate Surviving Space: The Impact of Hemoglobin Levels on Human Body in a Vacuum
- BrigetJameson
- · Replies 6 ·
Undergrad What Happens When Two Black Holes Collide?
- jayaramas
- · Replies 6 ·
Graduate Time dialation when viewing across the universe
- DarkMatterHol
- · Replies 29 ·
Stargazing Eclipse of the Moon from Sydney, Australia 10 Dec 2011 video
- baz201
- · Replies 2 ·
Graduate Universal mass than a proton?
- megacal
- · Replies 5 ·
Graduate Movement in time/movement in space
- foolishwun
- · Replies 1 ·
Graduate Mars Atmosphere And Magnetic Field
- mjacobsca
- · Replies 5 ·
High School SECCHI Uncovers What? Near Mercury
- DoggerDan
- · Replies 2 ·
Graduate How fringe are alternatives to the Big Bang Theory?
- Mooky
- · Replies 11 ·
Graduate Influence of metallicity on effective temperature of star
- Anne-Sylvie
- · Replies 4 ·
Undergrad Highest Star Core Temperature: Does Size Matter?
- goldsax
- · Replies 8 ·
Graduate Relativistic effects on planetary shear [tidal forces]
- nearc
- · Replies 3 ·
Graduate Is Dark Energy Necessary for the Acceleration of the Universe's Expansion?
- gregtomko
- · Replies 131 ·
High School Can the Mass of a Black Hole Bend Time and Space?
- Bogrune
- · Replies 5 ·
High School How realistic are the colors that we see in pictures of galaxies/nebulas?
- Vicbramwell
- · Replies 11 ·
Stargazing Ever wonder what happens during a lunar eclipse?
- Jimmy Snyder
- · Replies 20 ·
Graduate What Would It Take to Travel to a Parallel Universe?
- Mind Bender
- · Replies 3 ·
Undergrad S.O.L vs The Big Bang: Speed of Expansion
- richardg1987
- · Replies 25 ·
Graduate Is there a discrepancy between the Oldest Galaxy and Age of the Universe
- Tanelorn
- · Replies 15 ·
Graduate Dark Energy in the Zero Energy Universe
- 7icarus7
- · Replies 4 ·
Graduate Is There a Ground Zero for the Big Bang?
- Charles Brown
- · Replies 11 ·
Graduate Neutron Star Below the Chandrasehkar Limit - Properties & Atomic Matter?
- fhqwgads2005
- · Replies 15 ·
Graduate What happens when a black hole evaporates?
- Willis666
- · Replies 1 ·
Undergrad Half Light Speed Probes: See What Earth Sees
- Mikec_vet
- · Replies 3 ·
Graduate Dark matter vs. modified gravity?
- alemsalem
- · Replies 2 ·
Graduate Could Our Universe Be Inside a Black Hole?
- Vincent Neave
- · Replies 6 ·
Undergrad Impact & Gravitational Effects of Asteroids/Comets on Moons Orbit
- MaverickBlue
- · Replies 8 ·
High School Having trouble understanding how We are made from a supernova?
- nukeman
- · Replies 12 ·
Graduate Time variable of space-time at the end of universe
- VaibhavP
- · Replies 7 ·
High School Few Question from a Naive Astro enthusiast
- galisuman
- · Replies 6 ·
Fascinated by the space,stars,sky
- shankar93
- · Replies 3 ·
Graduate Astronomical spectroscopy and doppler shift.
- ViolentCorpse
- · Replies 9 ·
Undergrad Problem understanding NBody simulation physics
- Bekos
- · Replies 3 ·
Graduate Find the Lead Pursuit Line to Reach a Planet
- GrantB
- · Replies 3 ·
Undergrad Computer simulations of expanding space
- nearc
- · Replies 5 ·
Graduate How intimate are the rays of light?
- nihilius
- · Replies 5 ·
Why do people ask why life exists?
- fomenkoa
- · Replies 11 ·
Undergrad The age of the universe vs. the speed of light
- cisco kid
- · Replies 36 ·
What are some recommended Cosmology books?
- The Lobster
- · Replies 4 ·
Undergrad Does Our Milky Way Stir Up Solar System Collisions?
- really.
- · Replies 1 ·
Graduate Black hole vs. Black hole, who wins?
- Chaos' lil bro Order
- · Replies 44 ·
Undergrad What Causes Time Dilation on Mars?
- goodabouthood
- · Replies 11 ·
Undergrad Could a Black Hole Be 10 Billion Times Larger Than the Sun?
- Passionflower
- · Replies 1 ·
Graduate The expansion of the universe and gravity: One question.
- McCartney
- · Replies 6 ·
Graduate String Theory and Eternal Inflation
- dm4b
- · Replies 14 ·
Graduate The Blushing Face of Saturn: Radiance, Luminosity & Habitable Zone
- writtenword
- · Replies 2 ·
Undergrad Could the Big Bang Have Created a Black Hole?
- mangog
- · Replies 3 ·
Stargazing Is the Hubble Telescope Obsolete?
- Thecla
- · Replies 10 ·
Graduate Can a New Theory Accurately Predict the Composition of the Universe at Any Age?
- Dynamotime
- · Replies 38 ·
Graduate Just a Little Mind Game re: Superluminal Neutrino Velocities
- BadBrain
- · Replies 23 ·
Graduate Deriving a scale factor expression for FLRW model
- Rettaw
- · Replies 2 ·
Undergrad Using Rspec to Interpret Stellar Spectra
- Raxas
- · Replies 4 ·
Undergrad How Were Daily and Annual Cycles Explained Before Copernicus?
- Front Office
- · Replies 2 ·
Are black holes really the cookie monsters of the universe?
- clearwater304
- · Replies 2 ·
Do you think astronomy is a useful science?
- Athalus
- · Replies 23 ·
Graduate What is the rate at which the CMBR is cooling?
- PhoenixKnight
- · Replies 6 ·
Graduate Computation of Solar Position and Velocity Vectors (Meteor Orbit)
- solarblast
- · Replies 1 ·
Graduate Question: What is the Universe Expanding Into?
- Ossama
- · Replies 35 ·
Undergrad First post ever. Be Kind. Solar orbit questions
- Johio
- · Replies 8 ·
Graduate Inflation and expansion of spacetime
- stglyde
- · Replies 2 ·
Graduate Dark energy <=> negative energy?
- Amir Livne
- · Replies 3 ·
Bill O'Reilly the master of Astronomy?
- EternityMech
- · Replies 6 ·
Graduate About the hot gas around NGC 4555
- Buckethead
- · Replies 2 ·
Graduate Anyone have access to the 1955 Nautical Almanac?
- solarblast
- · Replies 3 ·
Graduate How Can I Solve a Two-Body System Using Kepler's First Law?
- cp05
- · Replies 11 ·
Graduate Unraveling the Mysteries of Black Holes and the Big Bang
- Dave Apsey
- · Replies 27 ·
Graduate Could the Universe Be Rotating Instead of Expanding?
- wildwill
- · Replies 4 ·