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 If Saturn floats, then what happens?
- godwinfh
- · Replies 2 ·
Undergrad Discover the Hubble Ultra Deep Field: Deepest Portrait of the Visible Universe
- russ_watters
- · Replies 39 ·
Graduate Is Dark Energy Consistent with a Cosmological Constant?
- Chronos
- · Replies 37 ·
Graduate So what's the currently accepted gravity theory?
- Sariaht
- · Replies 3 ·
Undergrad Galaxy defy Kepler? True or bull?
- MonstersFromTheId
- · Replies 21 ·
Astronomy Song Game - Get Creative!
- FeynmanMH42
- · Replies 19 ·
High School Converting parsecs to Mega-parsecs
- Krissy0612
- · Replies 1 ·
Graduate Big Rip Red Sky? - Universe's Fate Explored
- kaiser
- · Replies 6 ·
Graduate Is Order at the Edge of Chaos a Valid Explanation for the Universe's Operation?
- elan
- · Replies 4 ·
Graduate What is the relationship between gravity and dark energy in black holes?
- Sariaht
- · Replies 6 ·
Graduate Dark Energy Discoevery [NASA Teleconference 16 Nov]
- neutrino
- · Replies 26 ·
Undergrad The Expanding Universe: Why Stretching is the Only Explanation
- Tim.thelion
- · Replies 1 ·
Undergrad Dark Matter Simulation: Help Choose a Program Language
- physicsatiztech
- · Replies 3 ·
High School Align Earth, Sun & Milky Way: Date Revealed
- osirisisis
- · Replies 9 ·
Graduate Is the Universe Alive? The Fascinating Theory of an Evolving Cosmos
- RAD4921
- · Replies 5 ·
Undergrad Is the Evolution of Matter Density Proportional to a^3 or 1/a^3?
- aquabug918
- · Replies 1 ·
Undergrad Is Gravity Like a Bed Sheet and Baseball?
- Nexus555
- · Replies 6 ·
Graduate Has the Three Body Problem Ever Been Solved?
- tim_lou
- · Replies 11 ·
Undergrad Stars colliding/meeting up with each other
- Bladibla
- · Replies 2 ·
Graduate Speed of light and universal expansion.
- thewiseman
- · Replies 3 ·
Undergrad Universe expansion VS speed of light
- taylaron
- · Replies 20 ·
Transit of Mercury 2006: Tips for Capturing Photos | Physics Forums Blog
- robphy
- · Replies 13 ·
Formation of the Moon: Did You Catch its Name?
- kleinma
- · Replies 15 ·
Is There Liquid Beneath Saturn's Monster Storm?
- turbo
- · Replies 3 ·
High School Time taken to form universe, religion vs science.
- alias25
- · Replies 5 ·
Undergrad What is Space Physics and How Does it Relate to Cosmology and Astrophysics?
- bkvitha
- · Replies 9 ·
Graduate Where Does The Hawking Radiation Go?
- Silverbackman
- · Replies 23 ·
Creating a Time Machine: Can it be Done?
- ritwik06
- · Replies 2 ·
Graduate Supermassive BHs: Forming Farthest Quasars
- capnahab
- · Replies 6 ·
Undergrad Earth changing tangental velocity?
- TuviaDaCat
- · Replies 1 ·
High School No storm on Earth lasts like the one on Jupiter
- DaxInvader
- · Replies 19 ·
What Defines Our Individual Universes?
- vadslram
- · Replies 2 ·
Undergrad How Would Changes in the Sun's Mass and Earth's Velocity Affect Earth's Orbit?
- ritwik06
- · Replies 7 ·
Graduate Does the PA show that DM/DE is dynamically important in the outer solar system?
- Garth
- · Replies 18 ·
Undergrad Understanding the Expanding Universe: A Simple Analogy for Kids
- Chaos' lil bro Order
- · Replies 10 ·
Evaluate the pic : got a black spot in sun
- mik0930
- · Replies 2 ·
Graduate Could Matter Exist in a Black Hole on the Level of Quarks?
- Playdo
- · Replies 1 ·
Graduate What if the Universe had this cosmology
- aeroboyo
- · Replies 6 ·
Graduate Max Gravity Boost: Hyperbolic Trajectory from Jupiter
- tony873004
- · Replies 5 ·
High School A question related to solar system
- ultranet
- · Replies 2 ·
High School What Can You See in the Night Sky with the Current Comet?
- George Jones
- · Replies 3 ·
Can the Hubble Repair Mission Extend the Life of NASA's Beloved Telescope?
- turbo
- · Replies 3 ·
Undergrad Would Earth's Rotation Change If the Moon Exploded?
- Neohaven
- · Replies 11 ·
High School The sun's gravitational pull on the earth
- Mono182
- · Replies 55 ·
Undergrad Why are the emission lines in the Crab Nebula split into two?
- judi6070
- · Replies 9 ·
Astronomy Question: Differences Between Nebula and Death Star
- ultranet
- · Replies 6 ·
High School Varibles/Eclipsing Binary systems
- Cyclotron
- · Replies 2 ·
Graduate Newtonian derivation of Friedmann equation
- Mike2
- · Replies 2 ·
High School Does a Geo-Synchronous Satellite Catch a Shadow?
- ucmassahana
- · Replies 3 ·
Graduate Is the CERN particle accelerator risking a phase change in the Universe?
- ptalar
- · Replies 6 ·
Graduate On black holes and the implications according to me.
- Arithus
- · Replies 1 ·
Undergrad Are There Habitable Planets Orbiting Alpha Centauri?
- AA Institute
- · Replies 10 ·
Undergrad When will Andromeda galaxy look as big as the moon today?
- waht
- · Replies 8 ·
Undergrad The Dominant Source of Earth's Surface Heat: Solar Radiation or Interior Heat?
- tony873004
- · Replies 6 ·
Undergrad Lunar Phase Change with Reversed Moon Orbit
- smurfride
- · Replies 3 ·
High School What Is Galactic Motion and How Is It Explained?
- anaguma
- · Replies 6 ·
Undergrad Why Hasn't the Kuiper Belt and Scattered Disc Coalesced into a Planet?
- FeynmanMH42
- · Replies 1 ·
High IQ & the Universe: Perceiving Patterns & Cycles
- ouchparadoxhurts
- · Replies 11 ·
Undergrad IAU Redefines the Solar System: 12 Planets, Countless Possibilities
- BobG
- · Replies 36 ·
High School Conveyor Belt on Sun: What is it & How Does it Link to Solar Storms?
- dongcute
- · Replies 3 ·
Solar Storm Ideas: Share Your Thoughts Here
- dongcute
- · Replies 2 ·
Graduate Effect of dark matter on solar system dynamics
- Loren Booda
- · Replies 14 ·
Graduate Does Kepler's Third Law Account for Dark Matter in Galaxy Rotation Curves?
- FeynmanMH42
- · Replies 21 ·
Undergrad Solar wind + Weak magnetic field = No water?
- dongcute
- · Replies 4 ·
Graduate Turbulence pressure in convection zone
- Helios
- · Replies 2 ·
Graduate My calculation of the density of the universe at (10^60)th of its present age
- kmarinas86
- · Replies 2 ·
Undergrad What Properties Can Be Extracted from the Hipparcos Catalogue?
- covers
- · Replies 6 ·
Undergrad ExoPlanet Hunting: Observing Stars with Celestron C11 XLT
- Cyclotron
- · Replies 4 ·
Graduate Discover the Universe's Undensity with the Human Body Calculation
- Chaos' lil bro Order
- · Replies 3 ·
Stargazing How does the reappearance of Io during an eclipse relate to linear lighting?
- big man
- · Replies 4 ·
Saturn's Rings Backlit: Glorious Detail & Light
- FeynmanMH42
- · Replies 1 ·
Graduate Limitations on cosmology for observers restricted to Earth
- Loren Booda
- · Replies 3 ·
Graduate What Theories Explain Quasar Energy Concentration and Their Challenges?
- Tsunami
- · Replies 2 ·
Graduate What does it mean for the universe to be globally flat,
- cesiumfrog
- · Replies 8 ·
Graduate Universal expansion reaching a point of equiblirium
- Zegnarfol
- · Replies 3 ·
Graduate What Are the Effects of Extreme Pressure on Electron Degenerate Matter?
- Azael
- · Replies 7 ·
Graduate Big Bang and Simultaneity question
- master_gopher
- · Replies 2 ·
Undergrad Redshift - does energy fade or get absorbed?
- Corkie2003
- · Replies 5 ·
Graduate Would an Object Fall Straight Through a Hole in a Spinning Planet?
- Dmstifik8ion
- · Replies 5 ·
Graduate What are the leading theories behind the formation of dwarf galaxies?
- vincentm
- · Replies 1 ·
Undergrad Light years-distance or light travel time?
- Chip Orr
- · Replies 3 ·
Undergrad Proving Venus's Orbit is 0.72x Earth's: Understanding Greatest Elongation
- ahirschey
- · Replies 2 ·
Undergrad Can Gravity Create a Perpetual Motion System in Planetary Orbits?
- neurotic
- · Replies 6 ·
Graduate Why is the Poincaré dodecahedron not observed in the universe?
- fmichel
- · Replies 17 ·
Graduate Scalar field pressure and energy density
- S.P.P
- · Replies 4 ·
Undergrad Horizontal system of celestial coordinates
- suedenation
- · Replies 1 ·
Getting Ready to Stargaze: My Orion Atlas 11 Arrives Soon
- russ_watters
- · Replies 24 ·
Graduate How is Cosmic Background Radiation Generated and What Does It Reveal?
- marlon
- · Replies 25 ·
Undergrad Gravitational pull is related to rotational speed?
- waterchan
- · Replies 3 ·
Undergrad What Is the Significance of Zero Right Ascension in Astronomy?
- chill85
- · Replies 1 ·
Graduate Do galaxies have a negative mass defect?
- kmarinas86
- · Replies 2 ·
Graduate This universe would expand right?
- aquabug918
- · Replies 11 ·
Graduate Inflationary Theory out of thin air?
- Chaos' lil bro Order
- · Replies 33 ·
Cosmology & Physics Books: Recommended Reads
- student007
- · Replies 7 ·
Graduate Expanding Universe (an interestin mind experiment)
- pfontec
- · Replies 4 ·
Undergrad Measuring the absolute value of the AU
- Alvin
- · Replies 1 ·
Graduate Does the Maximum Entropy of a Black Hole Allow for Hawking Radiation?
- TriTertButoxy
- · Replies 1 ·
Graduate The possiblity of a solid planetary disk
- Loren Booda
- · Replies 18 ·
Graduate How to Solve Tolman-Oppenheimer-Volkov Equations for Neutron Stars?
- Karliski
- · Replies 3 ·
Graduate Mass of Black Holes: Measuring the Unmeasurable?
- zero12104
- · Replies 2 ·