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
Get Ready for a Rare Mars Flyby: Second Closest Approach in 60,000 Years!
- 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 Understanding Dark Matter: Theories and Effects on the Cosmos
- vincentm
- · Replies 76 ·
Graduate Oscillating Universe: QG Theories on Gravity & Black Holes
- 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 Sir Fred Hoyle: Discovering Elements in Supernovae
- Plastic Photon
- · Replies 3 ·
High School Forming Planets & Life in Liquid Water
- lord_jebus
- · Replies 2 ·
Undergrad Are Stars Perfect Black Bodies or Just Approximations?
- werner heisenberg
- · Replies 4 ·
Graduate 'First Light' and the Universe's early years
- DaveC426913
- · Replies 25 ·
High School Begin Astronomy: Tips for £150 Telescope in England
- Zilalti
- · Replies 11 ·
Graduate What is the current state of the universe and its expansion?
- _X3R0_
- · Replies 1 ·
Graduate IMF of First Stars: R. Schneider et al.
- 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 How Do I Solve These Complex Astronomy 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 Superman Holding the Moon: Is It an Impressive Feat?
- randy23
- · Replies 8 ·
Viewing Moon & Milky Way: Best Time & Rare Events
- 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 Quickie: CP and power spectrum of the CMB
- honestrosewater
- · Replies 11 ·
Undergrad Exploring the Habitable Zone and Tidal Lock in Exoplanet Systems
- Freight_train04
- · Replies 1 ·
Undergrad How Do You Determine Visible Right Ascension and Declination Coordinates?
- big man
- · Replies 15 ·
Graduate Star Formation: Density, Temperature & Fusion
- vincentm
- · Replies 4 ·
High School How Does the Size of an Eclipsing Planet Affect Star Brightness?
- skiboka33
- · Replies 4 ·
Graduate Learning About the Three Body Problem & Hamiltonian Systems
- 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 Has Dark Matter's Mystery Finally Been Solved?
- 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 The Apollo Laser Ranger Retroreflector Experiment
- 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 Where Can Beginners Find Good Astrophysics Websites?
- kirkgrove
- · Replies 2 ·
Very Large Telescope Project - Amazing Images
- ranger
- · Replies 2 ·
Graduate The Susskind Counter Information Paradox?
- Spin_Network
- · Replies 7 ·
Undergrad Saturn's Moon Iapetus: Big Wall & Geology Mystery
- the blob inc
- · Replies 8 ·
New Planet "Xena" and it's moon is "Gabrielle"
- handshakeit
- · Replies 7 ·
High School Discover the Innovative Space Ladder Technology | Learn More Now!
- BigMacnFries
- · Replies 27 ·
Graduate No problem, always happy to provide some clarification.
- 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 ·
My Hero: Waid Mobile Observatory
- russ_watters
- · Replies 9 ·
Undergrad Will the Expanding Universe Break the Attractive Forces Between Particles?
- lwymarie
- · Replies 11 ·
Undergrad Explore Venus: Mystery, Atmosphere & Surface Features
- 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 ·
Glimpsing a Mysterious Whizzing Object in the Night Sky
- 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 Early Reionization: HUDF-JD2 Examined
- 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 ·
Undergrad F=mv^2/r and Geosynchronouse orbits
- Elder
- · Replies 3 ·
Graduate Dimensions/parallel universe questions
- Doom_Machine
- · Replies 8 ·
Undergrad Galaxy Death: Is Starbirth Rate Decreasing?
- vincentm
- · Replies 8 ·
High School The Weight of Black Holes: Physics Behind Tiny Masses with Giant Implications
- anarchy.spirit
- · Replies 11 ·
Garbage Universe: A Thought on Parallel Dimensions
- Chaos' lil bro Order
- · Replies 30 ·