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 CMBR - multiple detections of the same 'spots'?
- Nereid
- · Replies 2 ·
Graduate How reliable are the redshift measurements from GRB 050904?
- wolram
- · Replies 17 ·
Graduate How Would the Universe Evolve Without Gravitation?
- Loren Booda
- · Replies 13 ·
Graduate The Distribution of Dark Matter in Spirals
- Garth
- · Replies 9 ·
High School What is the maximum possible wavelength of radio waves?
- The Guru Kid
- · Replies 14 ·
Mars flyby accuracy: second closest in 60,000 years claim examined
- russ_watters
- · Replies 7 ·
Undergrad Where Does the First Second of the Universe Fall on the Time Line?
- flotsam
- · Replies 2 ·
Graduate Could Gamma-ray Bursts Trigger Mass Extinctions?
- Entropy
- · Replies 16 ·
Undergrad How Do Scientists Counteract Radiation Pressure on Artificial Satellites?
- varungreat
- · Replies 7 ·
Undergrad What is dark matter and what effects does it have?
- vincentm
- · Replies 76 ·
Graduate How do quantum gravity theories handle gravity during universe contraction?
- wolram
- · Replies 8 ·
Graduate Asteroseismic Analysis of Kepler Data
- wolram
- · Replies 16 ·
Undergrad How Did the Big Bang Create Atoms?
- Mwyn
- · Replies 38 ·
High School Finding info on the physicist who showed elements form in supernovae
- Plastic Photon
- · Replies 3 ·
High School How do planets form and what makes liquid water necessary for life?
- lord_jebus
- · Replies 2 ·
Undergrad Are stars considered black bodies?
- werner heisenberg
- · Replies 4 ·
Graduate 'First Light' and the Universe's early years
- DaveC426913
- · Replies 25 ·
High School What can I see with a £150 telescope in England?
- Zilalti
- · Replies 11 ·
Graduate What is the current state of the universe and its expansion?
- _X3R0_
- · Replies 1 ·
Graduate Initial mass function of the first stars and reionization
- wolram
- · Replies 12 ·
Graduate More about the Cooperstock and Tieu model
- EL
- · Replies 9 ·
Graduate What Are the Libration Points in the Mars, Phobos, and Deimos System?
- dev_arora_13
- · Replies 2 ·
Undergrad Is the Milky Way a Resonance-Ring Galaxy?
- vincentm
- · Replies 13 ·
Undergrad New study shows Dark Matter isn't needed? Relativty explains it?
- Cosmo16
- · Replies 67 ·
Undergrad Why Do All Galaxies Have a Supermassive Black Hole at Their Centre?
- flotsam
- · Replies 1 ·
Graduate Star formation rates z=6 to z=10
- wolram
- · Replies 1 ·
Graduate Any such equation to relate spacetime to energy/mass
- professor
- · Replies 8 ·
Undergrad Converting from the horizontal system to the equatorial system
- Brewer
- · Replies 1 ·
Graduate Mars diameter from angular size, telescope optics, and orbital mechanics problems
- astronomystudent
- · Replies 1 ·
Graduate Wraparound Universe: Is It Feasible?
- -Job-
- · Replies 3 ·
Graduate New study shows Dark Energy isn't needed? Relativty explains it?
- Garth
- · Replies 11 ·
Undergrad How do scientists put satellites into space
- sid_galt
- · Replies 5 ·
Stargazing How can stacking improve astrophotography?
- zanazzi78
- · Replies 3 ·
Undergrad How can I determine orbital elements using observations of an asteroid's motion?
- VantagePoint72
- · Replies 2 ·
Undergrad Is the inernal energy of the universe decreasing?
- alias25
- · Replies 1 ·
Graduate What Challenges Did I Face in Capturing Images of the Andromeda Galaxy and Mars?
- russ_watters
- · Replies 0 ·
Find Out Who Has a Myspace Page on PF - Share Your Addiction!
- MaxS
- · Replies 5 ·
Graduate Message in the Sky: The Mysteries of the Heavens
- EL
- · Replies 2 ·
Undergrad How much force would Superman need to hold back the moon at half a G-force?
- randy23
- · Replies 8 ·
When can you see the moon biggest and the Milky Way best?
- Cladson
- · Replies 3 ·
Graduate Reionization: A Primer on Early Universe Physics
- wolram
- · Replies 1 ·
Undergrad Deriving Equations for Moon's Orbital Acceleration
- neo32
- · Replies 1 ·
Graduate What does the CMB power spectrum tell us about the cosmological principle?
- honestrosewater
- · Replies 11 ·
Undergrad Habitable zone distances for F-M stars and tidal locking around M dwarfs
- Freight_train04
- · Replies 1 ·
Undergrad How do you determine what coordinates are visible from your location?
- big man
- · Replies 15 ·
Graduate Does density increase in collapsing fragments trigger fusion?
- vincentm
- · Replies 4 ·
High School How Does the Size of an Eclipsing Planet Affect Star Brightness?
- skiboka33
- · Replies 4 ·
Graduate What is a Hamiltonian system?
- zanazzi78
- · Replies 1 ·
Undergrad How does the cosmic background radiation works
- werner heisenberg
- · Replies 2 ·
Undergrad Weak and strong anthropic principle
- werner heisenberg
- · Replies 17 ·
High School Observing Unusual Red Star in Scorpius Constellation
- Kazza_765
- · Replies 2 ·
Undergrad What Would Happen to Gravity If Earth Stopped Spinning?
- Pengwuino
- · Replies 3 ·
Undergrad Calculating Space Probe Trip to Neptune with Jupiter Assist
- gk8
- · Replies 2 ·
Undergrad Gravitational effect of sun on earth
- xj420
- · Replies 13 ·
Graduate Where are the real definitions of homogeneity and isotropy?
- honestrosewater
- · Replies 26 ·
Graduate Recent developments in dark matter research
- iddo
- · Replies 43 ·
Graduate What Would Happen if You Tried to Move Beyond the Edge of the Universe?
- Neiby
- · Replies 17 ·
Undergrad How Are Planets Detected Through Transit Method?
- asdf60
- · Replies 1 ·
Undergrad What Are Physical Symmetries and How Do Particles Transform?
- werner heisenberg
- · Replies 6 ·
Blackhole gulps down Neutron Star
- Spin_Network
- · Replies 1 ·
Graduate Semi-pop review of structure of universe
- marcus
- · Replies 1 ·
Graduate UV Galaxy Surface brightness says no expansion
- CarlB
- · Replies 30 ·
Graduate Apollo laser retroreflector experiment publication and feasibility
- Ptolemy
- · Replies 10 ·
High School Is NASA's Future Tied to Russian Spacecraft?
- BobG
- · Replies 13 ·
Undergrad Heat of objects entering an atmosphere?
- randy23
- · Replies 2 ·
Graduate A Case For an Indeterministic Universe
- Royce
- · Replies 30 ·
Undergrad What Day Will You See the Same Star Rise at 10:40pm?
- dekoi
- · Replies 5 ·
Undergrad What Is Dark Matter Made Of?
- cozzmikjoker
- · Replies 21 ·
Graduate Dark matter highlights extra dimensions
- SimonA
- · Replies 38 ·
Stargazing Did I finally capture decent pictures of Mars and other celestial objects?
- russ_watters
- · Replies 4 ·
Graduate Understanding Object Movement in Space: Factors Affecting Speed Between Galaxies
- Evilinside
- · Replies 2 ·
High School Good websites for learning astrophysics
- kirkgrove
- · Replies 2 ·
Very Large Telescope Project - Amazing Images
- ranger
- · Replies 2 ·
Graduate The Susskind Counter Information Paradox?
- Spin_Network
- · Replies 7 ·
Undergrad Why does Iapetus have an equatorial ridge bisecting it?
- the blob inc
- · Replies 8 ·
New Planet "Xena" and it's moon is "Gabrielle"
- handshakeit
- · Replies 7 ·
High School How does a space ladder from a satellite work?
- BigMacnFries
- · Replies 27 ·
Graduate Can stellar material be recycled after a star goes nova?
- wolram
- · Replies 9 ·
Undergrad Is the LuniSolar theory a legitimate scientific theory?
- Moonrat
- · Replies 1 ·
Undergrad How do astronomers measure an objects angular size?
- Vast
- · Replies 7 ·
Building a mobile observatory
- russ_watters
- · Replies 9 ·
Undergrad Will the Expanding Universe Break the Attractive Forces Between Particles?
- lwymarie
- · Replies 11 ·
Undergrad What caused Venus's slow rotation, extreme heat, and global resurfacing?
- Andre
- · Replies 6 ·
Undergrad Greek Astronomers & Telescopes: Determining Magnitude & Brightness
- skiboka33
- · Replies 4 ·
Graduate Galaxies recede faster than light
- Seeruk
- · Replies 28 ·
Graduate Is a Euclidian Model the Solution to the Gravity=Geometry Conundrum?
- turbo
- · Replies 7 ·
Fast-moving object I saw in the sky last night
- alias25
- · Replies 8 ·
Undergrad How Can We Quickly Calculate Distances to Stars Without Parallax?
- psychemage
- · Replies 3 ·
Graduate Is the Expansion of the Universe Leading to Heat Death?
- shingetsunohimitsu
- · Replies 72 ·
Graduate Can HUDF-JD2 reionize the intergalactic medium at z≳6.5?
- wolram
- · Replies 6 ·
Graduate Could There Have Been a Virtual Particle Era Before the Planck Time?
- Loren Booda
- · Replies 1 ·
Graduate Horizon scale at the onset of cosmic acceleration
- turbo
- · Replies 1 ·
High School What Are the Best Introductory Articles on the Origins of the Universe?
- Soaring Crane
- · Replies 2 ·
Undergrad Are Black Holes Responsible for Galaxy Formation?
- sanjith
- · Replies 8 ·
Are we somewhere in the middle of everything?
- Mozart
- · Replies 8 ·
What are the notes for Course Navy: Astrodynamics Halo?
- petra
- · Replies 1 ·
High School Between the moon and the Earth a Spaceship travels
- Avgiu
- · Replies 6 ·
Graduate Could Life Exist in a Universe with 1D Time and 2D Dimensions?
- Blahness
- · Replies 17 ·
Graduate Blackhole Question (involves Light)
- lifeisareaction
- · Replies 7 ·
Graduate Exotic particles destroying the universe
- Atomos
- · Replies 9 ·