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
Undergrad Just how dark is Pluto from orbit? How about Saturn?
- wedouglas
- · Replies 9 ·
Undergrad Position and angle of Earth/Moon/Sun and timing
- TouTorp
- · Replies 1 ·
High School Can I see stars through the moon?
- paddys09
- · Replies 13 ·
Undergrad Could Ice Form Inside the Sun?
- nefertum
- · Replies 4 ·
Undergrad What is the Scientific Understanding of Gravity?
- Backus
- · Replies 21 ·
Interesting simulation of a spiral galaxy evolution.
- Spinnor
- · Replies 5 ·
Undergrad What Determines the Diameter of a Moon Halo?
- jmvizanko
- · Replies 1 ·
Graduate Fundamental Cosmology conference (Stockholm, November 2012)
- marcus
- · Replies 0 ·
High School Did Mars Once Have Flowing Water?
- shifty88
- · Replies 14 ·
Graduate What is the distance needed for a rocket to reach a velocity of 0 on Planet X?
- scoop91
- · Replies 6 ·
Graduate Can Shock Waves Initiate Protostar Formation?
- hunt_mat
- · Replies 3 ·
Undergrad Apparent size of comets in images from the SOHO satellite
- Ostsol
- · Replies 4 ·
Graduate How can the Universe be flat and accelerating in its expansion?
- *FaerieLight*
- · Replies 2 ·
High School What is the age of the universe in billions?
- ofeyrpf
- · Replies 9 ·
Graduate Another nail in the coffin of alternative redshift theories
- Chronos
- · Replies 8 ·
Graduate Is My Proper Time the Same as Cosmological or Conformal Time?
- johne1618
- · Replies 2 ·
Graduate Looking for other proof of expanding universe.
- grounded
- · Replies 75 ·
Graduate Is Heat Death or the Big Rip Inevitable in an Open Universe?
- wolram
- · Replies 20 ·
Graduate Understanding Spectra Shifts of Distant Stars
- Ezio3.1415
- · Replies 10 ·
Undergrad Big Bang Questions: How Far, How Long, Possible?
- guitarphysics
- · Replies 3 ·
Graduate Energy in co-moving co-ordinates?
- johne1618
- · Replies 7 ·
Graduate Difference between the Higgs field and the Inflaton field?
- friend
- · Replies 7 ·
Graduate Periodicity in the mass of planets?
- Morgaen
- · Replies 5 ·
Graduate I'm sure this has been asked before, but: Universes colliding with each other
- mustang19
- · Replies 16 ·
High School Life in the Early Universe: Origins and Evolution
- GoodUniverse
- · Replies 38 ·
Graduate Cosmological constant from first principles
- Chronos
- · Replies 9 ·
Undergrad Is Retro-Rocket Still a Relevant Term for Slowing Down Satellites?
- Smileyxx
- · Replies 14 ·
Graduate Consequences of a negative mass universe
- olso4051
- · Replies 5 ·
High School Can a person catch an object in space and stop it without being pulled along?
- Ivan452
- · Replies 1 ·
Graduate Determining Mass/Density of Universe: How Accurate?
- mysearch
- · Replies 10 ·
Graduate Does Light Exist Outside Time?
- mugenshiyo
- · Replies 8 ·
Undergrad Can someone explain abberation of starlight?
- Pharaoness
- · Replies 3 ·
Graduate Could the Formation of Great Voids be Explained by Ordinary Laws of Motion?
- codex34
- · Replies 4 ·
Undergrad How Does the Moon Influence Earth's Rotation and Orbit?
- Rick James
- · Replies 4 ·
Oceans vs Outer Space: Colonization & Resources
- Monsterboy
- · Replies 14 ·
Graduate Observable Universe and Black Holes
- sefer
- · Replies 3 ·
Graduate Vogt-Russell Theorem: Learn & Model Stellar Structures
- po6
- · Replies 2 ·
Undergrad The universe and its matters: finite or infinite?
- nemoover
- · Replies 6 ·
Graduate Temperature of planets from their Luminosities at specific wavelengths.
- mystupidmouth
- · Replies 12 ·
Graduate Spacetime Crystal: Theory & Possibility
- Light Bearer
- · Replies 4 ·
Graduate Evidence of Cosmic Backround Radiation cooling
- Bill Minerick
- · Replies 5 ·
Graduate Gravity Assist Oberth Effect Sun
- Albertgauss
- · Replies 4 ·
Graduate Simple argument for a linear cosmology
- johne1618
- · Replies 10 ·
Graduate Dark Matter as possible ground state for all matter
- Bill Minerick
- · Replies 2 ·
Graduate Why does our universe/dimension follow the laws that it does?
- Niaboc67
- · Replies 2 ·
Undergrad Is Dark Rift a Rotating Cloud or a Dust Belt Surrounding the Galactic Center?
- ShayanJ
- · Replies 4 ·
Graduate Higgs Boson and Dark Matter / Dark Energy
- Velcro
- · Replies 11 ·
Graduate Jupiter and Saturn - Back and Forth in the Early Solar System?
- lpetrich
- · Replies 3 ·
Graduate Co-moving density should be constant?
- johne1618
- · Replies 14 ·
Graduate Perfect cosmological principle in co-moving co-ordinates
- johne1618
- · Replies 4 ·
Solar Activity Trends: Historical Chart and Validation for Current Increase
- DanSolo
- · Replies 8 ·
Graduate Many Worlds + Anthropic Principle
- kamikaze762
- · Replies 21 ·
Graduate A question about our prodominently matter universe.
- Dappy
- · Replies 1 ·
Graduate How did gravity build astronomical objects that rotate?
- Paulibus
- · Replies 31 ·
Graduate Does the Milky have a QSO? What is the observational evidence concerning QSOs?
- betzalel
- · Replies 24 ·
Graduate Universe was the size of our solar system after 1 sec
- kjamha
- · Replies 15 ·
Undergrad Backwards Orbiting Moon: Impact and Visibility with Earth's Rotation
- DeepSpace9
- · Replies 17 ·
Graduate How would Earth mass loss theoretically affect its orbital mechanics?
- mofobro
- · Replies 12 ·
Undergrad Red Shift: Questions About Light & Big Bang
- gway22
- · Replies 2 ·
Undergrad Is the Expansion of the Universe Slowing Down?
- NWH
- · Replies 15 ·
Graduate Oldest most distant Galaxy discovered to date
- Tanelorn
- · Replies 24 ·
Undergrad Do You Know Why Stars Have Different Colors?
- gmax137
- · Replies 13 ·
Graduate Is This Fomalhaut's Debris Disk?
- Drakkith
- · Replies 4 ·
Graduate How Are Fluid Solutions Used in Astrophysics and Cosmology?
- shounakbhatta
- · Replies 19 ·
Graduate How is mass distribution understood within the LCDM cosmological model?
- mysearch
- · Replies 5 ·
Graduate Angular Velocity of a Nebula Accretion Disk
- Vodkacannon
- · Replies 1 ·
Graduate How much space mining would begin to affect earth
- VegaMan
- · Replies 8 ·
Graduate Creating artificial ultradense objects by ablation implosion?
- monstermacina
- · Replies 23 ·
Graduate The Kantian Wall - The Meaning of Space, Time, and Mass in Modern Physics
- arupel
- · Replies 1 ·
Graduate Big Bang inflation/expansion vs centre of universe vs Speed of light query
- learningmore
- · Replies 28 ·
Graduate The First Law of Thermodynamics VS. The Universe Created from Nothing
- B.M.Gray
- · Replies 16 ·
Why is the Universe So Complex and What Should I Do About My Existential Crisis?
- genius01
- · Replies 1 ·
Graduate Origin of Matter: Theory Explaining Creation
- wasteofo2
- · Replies 66 ·
Graduate What does it mean that time is expanding?
- darrenr
- · Replies 10 ·
Graduate How to Generate Accurate Initial Conditions for Simulating Galaxy Dynamics?
- fab13
- · Replies 2 ·
Graduate Do Solar Systems with Eccentric Planets Have More Stable Orbits?
- Philosophaie
- · Replies 29 ·
Undergrad Q about moon and sun tides, energy related to comet strikes and the mass water?
- aw07
- · Replies 1 ·
Undergrad Is the Expansion of the Universe a Fact or a Possibility?
- DeepSpace9
- · Replies 9 ·
Graduate Is Spacetime Capable of Tearing or Breaking Down?
- r.hackett
- · Replies 3 ·
Graduate Direct detection of dark matter tendrils?
- ivorax
- · Replies 7 ·
What is the heaviest thing in the universe?
- markf
- · Replies 8 ·
Graduate Source of magnetic field of Neutron stars.
- lindloda
- · Replies 2 ·
Graduate How Does a 3.5D Perspective Enhance Our Understanding of Spacetime Expansion?
- Faradave
- · Replies 17 ·
Graduate Heat Interactions with Non-Normal Matter
- danielu13
- · Replies 4 ·
Undergrad How do you calculate declination and Right Ascension from Earth Coordinates?
- Brynjolf
- · Replies 3 ·
Graduate Understanding Rotation Curves: A Study of Galactic Density and Derivatives
- Dan_
- · Replies 1 ·
High School A theory about the beginning of the universe
- Ultimation
- · Replies 7 ·
Graduate Understanding the Zero Energy Principle of the Universe
- johne1618
- · Replies 39 ·
Graduate Isotropic and homogeneous of space
- sadegh4137
- · Replies 3 ·
Graduate The Fate of the Universe: Expansion, Matter Decay, and the Ultimate End
- MathematicalPhysicist
- · Replies 72 ·
Graduate At what speed are we moving through space?
- jabbercookie
- · Replies 19 ·
Graduate How is gravity considered as the weakest force?
- B.M.Gray
- · Replies 10 ·
Undergrad Unraveling the Mystery of the Universe's Center: Theories and Explanations
- francium87
- · Replies 18 ·
Graduate A good book for astrophysics&astronomy
- plasmon
- · Replies 3 ·
Graduate Is the Universe's Expansion Rate Truly Accelerating?
- Deeviant
- · Replies 17 ·
Undergrad Does Light Have Mass? Gravity Effects Explained
- Safamm
- · Replies 10 ·
Undergrad Basic Big-Bang ?'s For First Thread
- B.M.Gray
- · Replies 9 ·
Graduate Geocentricism, could you comment on a conversation I had about it?
- jarrah-95
- · Replies 6 ·
Graduate The Universe shouldn't look like it does if it is expanding
- dedwarmo
- · Replies 27 ·
Graduate Cherenkov radiation detection
- stargazer3
- · Replies 8 ·