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 Is Redshift an Accurate Indicator of the Universe's Expansion Rate?
- _Mayday_
- · Replies 1 ·
High School What is the Difference Between an Open and Closed Universe?
- _Muddy_
- · Replies 9 ·
Graduate Could Variation in Light Speed Explain the Horizon Problem?
- xsavior
- · Replies 9 ·
Phoenix Mars lander records first weather readings
- blimkie.k
- · Replies 9 ·
Graduate What Is the Event Horizon Size When All Matter Is Infinitely Packed Together?
- Khursed
- · Replies 6 ·
SK15075PEQ3-2 150mm Newtonian reflector specifications
- Ignition
- · Replies 9 ·
Graduate Reading my first Astrophys paper
- ZachWeiner
- · Replies 3 ·
Graduate Superwind phase in stellar evolution
- vertices
- · Replies 5 ·
Graduate Is the Pioneer Anomaly Evidence of Slower Movement Than Physics Predicts?
- PhantomOeo
- · Replies 1 ·
Graduate Black Hole Questions - Answers to Your Queries
- dmt740
- · Replies 3 ·
Undergrad Black holes and magnetic fields?
- The Moog
- · Replies 3 ·
Graduate Xray flash warns of supernova explosion
- marcus
- · Replies 7 ·
High School Radio waves are electromagnetic.Right?
- anonymoussome
- · Replies 1 ·
Graduate Could dark matter explain gravitational anomalies within atoms?
- Jøhn
- · Replies 22 ·
Graduate Each planet's angle from it's argument of perihelion
- Philosophaie
- · Replies 2 ·
Graduate Why is modified Newtonian dynamics (MOND) dismissed over dark matter?
- astrorob
- · Replies 14 ·
Graduate Is There Evidence of an Opposite to Black Holes in the Universe?
- mkbh_10
- · Replies 6 ·
Graduate What is dark matter and how are scientists searching for it?
- Phy6explorer
- · Replies 51 ·
New Special Issue: Dark Energy in GRG Journal
- Atakor
- · Replies 4 ·
Graduate Cosmological Constant in mks units
- robousy
- · Replies 6 ·
Graduate Questions on mass-to-light ratio
- Niles
- · Replies 1 ·
Undergrad Experience with the program 'Gaussfit'
- NoobixCube
- · Replies 6 ·
Graduate Proper distance at time of emission
- Niles
- · Replies 8 ·
Graduate Object that we can observe where all 3 types of redshifts
- Sanjay87
- · Replies 2 ·
Where is the Penrose lecture with the dry erase board notes?
- Sparky_
- · Replies 26 ·
Graduate ESF release on tapping early universe (23 May)
- marcus
- · Replies 2 ·
Graduate Calculating the cosmological constant from scratch
- marcus
- · Replies 1 ·
Graduate What's the implication of calulationing the apparent angular sizes of a galaxy
- aristurtle
- · Replies 5 ·
Undergrad Can a hyperbolic orbit return to perihelion?
- Ignition
- · Replies 2 ·
Graduate Angle deflection from gravitational lenses
- Niles
- · Replies 2 ·
Undergrad Other factors besides greenhouse gases in global temperatures
- Jimmy Snyder
- · Replies 17 ·
Graduate Tethered galaxy problem reconsidered
- jonmtkisco
- · Replies 22 ·
Graduate SOHO Observed Solar Inflow Events: What's the Explanation?
- AdamNailor
- · Replies 1 ·
Graduate A spectacular new way for stars to die
- SF
- · Replies 9 ·
Undergrad Why Don't Low Mass Stars Progress Beyond Helium Burning?
- vertices
- · Replies 6 ·
Graduate Do Planets and Stars Have a Net Charge and How Can It Be Measured?
- Buckeye
- · Replies 4 ·
Undergrad Transfer function to state space manually
- raedbenz
- · Replies 1 ·
Graduate Would a laser reflect off a neutron star surface?
- Maniax
- · Replies 1 ·
Graduate Is there a maximum size for a black hole?
- alex1819
- · Replies 3 ·
Graduate General relativity's physical attributes are frame-dependent
- jonmtkisco
- · Replies 34 ·
Graduate Penrose on YouTube, before bang cosmology, eight episodes October 2007
- marcus
- · Replies 2 ·
High School Why Do People Believe in the Big Bang Theory?
- xratx
- · Replies 35 ·
Undergrad Conservation of Energy: Wave Pool in Universe?
- mikesvenson
- · Replies 3 ·
Graduate How did the universe escape from being a black hole at the Big Bang?
- Bill Minerick
- · Replies 67 ·
Graduate Is dark energy from cosmic Hawking radiation?
- jal
- · Replies 19 ·
Graduate Space-like intervals and the ergoregion
- stevebd1
- · Replies 3 ·
Graduate Does the universe's expansion affect distances in the solar system?
- SF
- · Replies 1 ·
Missing matter found in deep space
- bassplayer142
- · Replies 4 ·
Graduate Was There Really a Billion Lightyear-Wide Void in the Sky?
- marcus
- · Replies 3 ·
Graduate What is the Best Way Forward in Astrophysics?
- wolram
- · Replies 1 ·
Graduate Does the WMAP immage show the edge of the universe?
- big prairie
- · Replies 24 ·
Graduate Determining Hubble Constant and Scale Factor of Universe
- weldon
- · Replies 14 ·
Graduate Non-Gaussianity Analysis on WMAP Data
- jal
- · Replies 2 ·
Graduate Does the cosmic web change the matter and dark energy fractions?
- g33kski11z
- · Replies 2 ·
Graduate Can loop quantum gravity see before the Bang?
- gtimespace
- · Replies 4 ·
Graduate How Can Democracy Handle Complex Scientific Issues?
- Wallace
- · Replies 6 ·
Graduate Congrats to Turbo on A Catalogue of M51 type Galaxy Associations
- marcus
- · Replies 10 ·
Undergrad Can Black Holes Revert Back Into Stars?
- Rawrrawrel
- · Replies 8 ·
Graduate Comet impact theory for Pluto's orbit and moons
- Jaramo1
- · Replies 4 ·
Graduate Why Is the Scalefactor 1 Today?
- Niles
- · Replies 3 ·
Graduate Gamma ray particle lifetime and behavior over cosmological timescales
- peter kool
- · Replies 13 ·
Graduate Microwave BG vs Expansion vs Hydrogen Microwave Emission
- Buckeye
- · Replies 6 ·
Undergrad Ways to create artificial gravity in spacecraft
- TheMuses
- · Replies 26 ·
High School Take a Picture of Big Bang - Clarifying Questions
- neatoizer
- · Replies 9 ·
Graduate Rocky Kolb's top 10 Questions about the Universe
- humanino
- · Replies 6 ·
Undergrad Why doesn't the reaction force cancel gravity in circular orbits?
- kyin01
- · Replies 21 ·
Undergrad Ordinary Energy - Is it Chopped Liver?
- Fluxman
- · Replies 11 ·
High School How do we know the Sun orbits the Galaxy?
- Dertulm01
- · Replies 13 ·
Graduate Stellar Evolution: After Hydrogen Exhaustion
- vertices
- · Replies 5 ·
If theres matter in the universe
- Denton
- · Replies 4 ·
Graduate Finding advice on polishing 200mm f/6 primary mirrors in Middle Tennessee
- montoyas7940
- · Replies 5 ·
Graduate On the physical basis of cosmic time
- Garth
- · Replies 5 ·
Where can I find astronomy exercises?
- koyote
- · Replies 2 ·
High School Can We Overcome Mars' Harsh Conditions for Human Habitation?
- AnthreX
- · Replies 13 ·
High School Are Our Atoms Stardust or Nuclear Waste?
- Holocene
- · Replies 6 ·
Undergrad Starting aerospace engineering at Texas A&M
- Texag
- · Replies 2 ·
Graduate Definition of Mass in Vacuum of Space
- Buckeye
- · Replies 15 ·
Graduate Do black holes create antimatter from matter?
- nuby
- · Replies 3 ·
Graduate Can Electrons Propel Spacecraft to Near Light-Speed?
- Durato
- · Replies 6 ·
Graduate Empty Space Just a quick thought you might enjoy.
- Jøhn
- · Replies 2 ·
High School Is There Really No Gravity in Space?
- LiqurC
- · Replies 11 ·
Graduate About the dimensions of the universe
- Mafarazzo
- · Replies 4 ·
Stargazing Choosing a first telescope under $350 for planetary detail
- Sheneron
- · Replies 21 ·
Graduate Inflationary framework of the universe
- The P-manator
- · Replies 1 ·
Undergrad Can the Universe's Shape Be Tested Like a Balloon?
- kasse
- · Replies 27 ·
Graduate Temperature between Galactic Structures
- JamesBrown
- · Replies 3 ·
High School Could light be a media for transport?
- DecliningTech
- · Replies 5 ·
Undergrad Why did Mars lose its magnetic field and atmosphere?
- bdrosd
- · Replies 13 ·
Undergrad Orbit of Comet 17P Holmes - equations
- CometDude
- · Replies 10 ·
Graduate Why does the moon always show the same face to Earth?
- GTrax
- · Replies 6 ·
Undergrad Mass and Traveling at the Speed of Light
- Lymitra
- · Replies 5 ·
Undergrad Is 1 e33 kg the Minimum Mass of a Black Hole?
- DB
- · Replies 18 ·
Undergrad Parsecs, trigonometric parallax and light years
- Auron87
- · Replies 4 ·
High School Is the center of the universe constantly changing?
- Igotquestions
- · Replies 10 ·
Undergrad The red shift - what does it indicate?
- kasse
- · Replies 28 ·
Graduate Closest distance between two conics (ellipse,hyp.,par.)
- petra
- · Replies 1 ·
Graduate How to Calculate Earth’s Number Density: Iron vs Proton Mass Method
- Planters99
- · Replies 3 ·
Graduate Does the Article Debunk the Big Bang Theory?
- kasse
- · Replies 4 ·
Graduate Equal amounts of what we call matter and antimatter
- Ed Aboud
- · Replies 2 ·
Graduate The Impact of Solar Mass Loss on Earth's Orbit
- Ian
- · Replies 1 ·