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
Where to find Kip Thorne's ph237 gravitational waves course
- coolmoss
- · Replies 3 ·
Graduate Antimatter clouds and gamma rays
- EnumaElish
- · Replies 1 ·
Graduate How can simulations help us measure dark energy and its effects on the universe?
- wolram
- · Replies 2 ·
High School Differences between astronomy, astrophysics, and cosmology
- Electrolight
- · Replies 3 ·
Graduate Why Invest Billions in LIGO if We're Certain About Gravity Waves?
- muccasen
- · Replies 13 ·
Undergrad Do we observe fast moving objects in the universe?
- Peter (IMC)
- · Replies 12 ·
Undergrad Does dark energy have anything to do with expansion?
- EnumaElish
- · Replies 3 ·
Undergrad Source of mysterious antimatter found
- EnumaElish
- · Replies 5 ·
Undergrad Mirroring sun with parabolic dish
- DaveC426913
- · Replies 6 ·
Graduate Can a neutron star have less mass than the Chandrasekhar limit?
- blumfeld0
- · Replies 1 ·
Graduate How does the Virial Theorem derivation for <K>=-<delta(U)> work?
- Himanshu
- · Replies 2 ·
Graduate What Can We See at the Origin Point of the Big Bang?
- Don P.
- · Replies 6 ·
High School Typical stellar distances of visible stars in the Milky Way
- Holocene
- · Replies 4 ·
High School Questions about Zhumell 3x Barlow for 12" Dobsonian Telescope
- NerfMonkey
- · Replies 2 ·
Graduate Can massive objects travel at light speed and does it enable time travel?
- _Mayday_
- · Replies 5 ·
Graduate What if GP1 fails to confirm GR and another model is favored?
- wolram
- · Replies 9 ·
Describe the universe in 15 words
- PIT2
- · Replies 60 ·
Graduate Beyond the Big Bang (mid-level book, 600 p, August 2008)
- marcus
- · Replies 4 ·
Mars Express Images from ESA's Mars spacecraft
- KS15
- · Replies 1 ·
High School Could I Have Seen the Horsehead?
- NerfMonkey
- · Replies 5 ·
Graduate Internal G=1 unit conversion/systems for simulation timestepping
- mdemone
- · Replies 4 ·
Graduate What happens to atoms when they enter a black hole?
- h.g.Whiz
- · Replies 2 ·
High School Did supernovae have anything to do with the solar creation?
- pixel01
- · Replies 8 ·
Undergrad Is NASA prepared for a potential Mars-impacting asteroid?
- tony873004
- · Replies 20 ·
Graduate Noise Removal in Radio Telescope Observations
- pseudo
- · Replies 7 ·
Undergrad Was the Dust Cloud Surrounding Proto-Earth Hot or Cold?
- conan
- · Replies 12 ·
High School What would make a star flash red and blue?
- Liger20
- · Replies 1 ·
Graduate Can Black Holes Really Rip Apart Atoms and Light?
- Meatbot
- · Replies 1 ·
Graduate Is it possible for a black hole to eat an entire galaxy?
- physicsdotcom
- · Replies 3 ·
Graduate What radiations do quasars emit and how do black holes generate their energy?
- Dr.Brain
- · Replies 13 ·
Graduate If the universe is getting colder, wouldn't this violate the 2nd Law?
- touqra
- · Replies 1 ·
Graduate A Place Where Gravity and Dark Energy Equalize
- wolram
- · Replies 1 ·
Graduate Can gas giants like Jupiter become stars and create a binary solar system?
- wizgrav
- · Replies 3 ·
Graduate Can black holes absorb at an infinite rate?
- nanoWatt
- · Replies 5 ·
Graduate Big bang and small bang black holes
- spideyinspace
- · Replies 5 ·
Undergrad Why gas giants were created far from the Sun?
- pixel01
- · Replies 8 ·
Undergrad Why do planetary orbits lie in a single plane?
- plutoisacomet
- · Replies 3 ·
Graduate An apology and thoughts on the cost of experimental cosmology
- wolram
- · Replies 2 ·
Undergrad Delta-V calculation for shuttle de-orbit maneuver
- davo
- · Replies 8 ·
MY SPACE website - packed with talentless people?
- pitot-tube
- · Replies 9 ·
Undergrad Gliese 581c/d and their Red Sun?
- Butch007
- · Replies 4 ·
Freakiest things in our solar system
- conan
- · Replies 15 ·
Undergrad Overview of cosmology and astrophysics for beginners
- chip-^.^-
- · Replies 5 ·
High School What Did We Find on Titan?
- lionell
- · Replies 8 ·
Stargazing Best telescope for a beginner with a $300 budget
- yalgaar
- · Replies 2 ·
High School Will the Universe Really End Up Filled with Black Holes?
- pixel01
- · Replies 4 ·
Graduate Is There a Definable Centre of the Universe?
- yuiop
- · Replies 42 ·
Undergrad How do we overcome the challenges of sending humans to the moon and Mars?
- yalgaar
- · Replies 3 ·
High School How fast must you throw a ball to reach orbital speed around Earth?
- yalgaar
- · Replies 6 ·
Graduate An Introduction to Black Hole Thermodynamics
- Greg Bernhardt
- · Replies 16 ·
Graduate Unpacking the Concept of Time: What Do We Really Mean By It?
- pediejo
- · Replies 5 ·
Graduate Do Gravity Waves Contribute to Gravitational Curvature?
- zankaon
- · Replies 2 ·
High School Is the geocentric model technically valid in relativity?
- I don't know
- · Replies 17 ·
Undergrad Best way for a layman to get up to speed on cosmology outside of school
- Meatbot
- · Replies 1 ·
Graduate Why do we and the entire universe exist?
- gdpudasaini
- · Replies 1 ·
Graduate Did the universe originate from a previous universe or from another dimension?
- s_u_s_h_i_l
- · Replies 11 ·
Graduate Re-Poll: We are in a Schwarzschild black hole-T or F?
- muccasen
- · Replies 4 ·
Graduate Gravity's Effect on Universe Expansion: Dark Energy?
- QG Daddy
- · Replies 1 ·
Undergrad Why Is My Zhumell Dobsonian's Laser Collimator Missing the Secondary Mirror?
- NerfMonkey
- · Replies 2 ·
Undergrad Does time decrease overall if there was one big bang but many black holes?
- scupydog
- · Replies 6 ·
Graduate What is the average mass a black hole consumes
- rubecuber
- · Replies 3 ·
Graduate What Can We Expect from the Very Early Universe Meeting at Cambridge?
- cristo
- · Replies 20 ·
Graduate Dark energy and the first law of thermodynamics
- stevebd1
- · Replies 8 ·
Undergrad Could intergalactic gas account for the universe's expansion?
- bassplayer142
- · Replies 9 ·
Undergrad Why do gas planets not collapse?
- pulsar28
- · Replies 1 ·
Graduate Superclusters and Voids - same curvature?
- jonmtkisco
- · Replies 58 ·
Graduate Why does time seem to exist only in a forward direction?
- robmacriner
- · Replies 16 ·
Undergrad How to calculate maximum wavelength and frequency in Wien's displacement law
- pseudo
- · Replies 1 ·
Graduate Why Does Gravitational Time Dilation Decrease With Distance?
- talksabcd
- · Replies 1 ·
Graduate 2nd law of thermodynamics and the big bang
- huyen_vyvy
- · Replies 7 ·
Graduate How Could the Universe Be Smaller Than a Proton?
- Himanshu
- · Replies 3 ·
Graduate Universal Acceleration and Boltzmann Brains
- CarpeCaelum
- · Replies 8 ·
Graduate Do Black Holes Emit Heat Due to Movement?
- Hippasos
- · Replies 5 ·
Undergrad Are Black Holes Cold? - Ask an Astrophysicist
- conan
- · Replies 9 ·
Graduate Virtual particles and black holes
- 2Tesla
- · Replies 10 ·
Graduate Can BigBang Happen Without a Vacuum?
- yasar1967
- · Replies 15 ·
Graduate Kepler's Equation to calculate transfer time
- brownnr
- · Replies 2 ·
Undergrad What Would a Nebula Look Like Close Up?
- dodo
- · Replies 4 ·
Graduate Centre of Mass and Cosmic Expansion in 4D Universe
- cosmic.ash
- · Replies 9 ·
Graduate That asteroid where's it going?
- Jenab6
- · Replies 12 ·
Graduate Can Pressure Explain the Accelerating Expansion of the Universe?
- DRogers
- · Replies 11 ·
High School How do we know the size of these suns?
- a_g
- · Replies 5 ·
Graduate If i had a black hole of 20 solar masses, how much energy would it radiate?
- rubecuber
- · Replies 3 ·
Graduate Milky Way's Two Halos Spin in Opposite Directions
- wolram
- · Replies 9 ·
Graduate How can you find out the amount of hawking radiation a black hole exhibits?
- rubecuber
- · Replies 4 ·
Undergrad Photon radiation, how does it work?
- W3pcq
- · Replies 9 ·
Graduate Lambda-CDM model and geometric units
- stevebd1
- · Replies 21 ·
Stargazing Telescope and astronomy questions
- bassplayer142
- · Replies 5 ·
Undergrad How is Stefan's Constant Used in Understanding Black Hole Radiation?
- rubecuber
- · Replies 1 ·
Undergrad Why Did Only Saturn Develop Magnificent Rings in Our Solar System?
- pixel01
- · Replies 5 ·
Graduate When a star explodes, does the shock wave
- trendal
- · Replies 10 ·
Graduate Hubble constant and intrinsic redshifts in Arp's cosmology
- wolram
- · Replies 11 ·
Undergrad Electric Currents in Planetary Magnetic Fields
- bmor
- · Replies 4 ·
Graduate Cosmology Challenges: Dark Matter, Dark Energy, Galaxy Formation
- wolram
- · Replies 1 ·
Undergrad How is the Inflation theory going?
- Gold Barz
- · Replies 1 ·
High School How to calculate the momentum of Pluto?
- ndirishchick
- · Replies 6 ·
Stargazing Negative Refractive Index Telescopes?
- natski
- · Replies 1 ·
Graduate Are high-z SNe Ia data reliable for measuring the evolution of dark energy?
- Garth
- · Replies 20 ·
Undergrad The Big Bang theory, and gravity
- amhere_2000
- · Replies 1 ·
Graduate Why do galaxies form disks while planets are spherical?
- Hippasos
- · Replies 3 ·