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 Shape of the Universe: Evidence for Expansion in a Single Direction
- Arithus
- · Replies 13 ·
High School Finding Cruithne's Orbit & Return to Earth's Orbit
- thenodfather
- · Replies 2 ·
High School Earth's Celestial Poles: North and South
- chill85
- · Replies 1 ·
Graduate The Supernova Legacy Survey (SNLS)
- Astronuc
- · Replies 3 ·
Graduate No HUP, a universe without unknowns?
- David Burke
- · Replies 18 ·
Graduate A question on the rate of time in the Light we observe
- popfuzz
- · Replies 2 ·
Graduate New Nature Paper: Old Ia Supernovae different?
- George Jones
- · Replies 4 ·
Will NASA's Hubble Servicing Mission Save the Telescope?
- russ_watters
- · Replies 1 ·
Evaluate the pic : got a black spot in sun
- mik0930
- · Replies 2 ·
Graduate Why Can't I Solve This Kepler's Law Problem Correctly?
- takoma
- · Replies 1 ·
Graduate Are Extreme Internal Accelerations Significant in the Inflationary Universe?
- oldman
- · Replies 3 ·
Graduate Is dark matter just an illusion?
- Mk
- · Replies 21 ·
Graduate What Causes a White Dwarf Star to Exceed the Chandra Mass Limit and Explode?
- Labguy
- · Replies 4 ·
Stargazing I want to build my telescope any advice ?
- ranroun
- · Replies 5 ·
High School Astronomy in West LA: Can You Observe with a Telescope?
- Quaoar
- · Replies 5 ·
Undergrad How Big Would A Planet Have To Be To Have Earth's Gravity?
- SAZAR
- · Replies 17 ·
Graduate How can a neutronstar that only consists of neutrons
- Hymne
- · Replies 6 ·
Undergrad Physical properties of objects that orbit each other in the universe
- judi6070
- · Replies 2 ·
Graduate What is the mystery behind the puffy planet HAT-P-1?
- Astronuc
- · Replies 3 ·
See Sunset from Space: Orange Clouds?
- ncr7
- · Replies 10 ·
Graduate Double Lobed Radio Galaxies & Seyfert Galaxies: Similar Energy Sources?
- blumfeld0
- · Replies 1 ·
Undergrad !Evidence of Star Formation in Molecular Clouds
- blumfeld0
- · Replies 5 ·
Undergrad What if objects go toward each other rather than away
- Skhandelwal
- · Replies 2 ·
Satellite Photo: Is It Plausible?
- DaveC426913
- · Replies 34 ·
Undergrad Jupiter's Atmosphere: Questions & Answers
- argonurbawono
- · Replies 3 ·
Graduate Can Light Be Multiply Scattered in the Universe?
- oldman
- · Replies 5 ·
Stargazing Upgrade Telescopes: Get Into Astrophotography & Stargazing near LIGO
- vincentm
- · Replies 19 ·
Graduate The cross section of a photon traversing the observable universe
- Loren Booda
- · Replies 16 ·
Graduate Supernova 1987a, light, neutrinos, VSL claims
- danriley
- · Replies 17 ·
Graduate New double pulsar testbed for GR and alts.
- marcus
- · Replies 0 ·
Graduate CP violation and element forging
- Pavel
- · Replies 17 ·
Graduate Could Gravitational Lensing Confirm the Existence of Dark Matter?
- ham 'n eggs
- · Replies 1 ·
Graduate Gravity On Earth Dependant On Distance From Center
- Darwin
- · Replies 8 ·
The Ultimate Question: What Created the Universe?
- unscientific
- · Replies 43 ·
Graduate Just an idea I've been going over.
- Arithus
- · Replies 2 ·
Graduate How Do You See Spectral Lines in Near IR from the Sun?
- rp895
- · Replies 1 ·
Graduate Tiny Blackholes may pervade space
- vincentm
- · Replies 7 ·
High School Pole Star Help: What Was the Pole Star 9-10,000 BC?
- Myra759
- · Replies 18 ·
Graduate Wet planets common (new simulation study by Raymond et al)
- marcus
- · Replies 0 ·
Graduate What Is the Role of Vacuum Fluctuations in the Universe's Origin?
- RAD4921
- · Replies 3 ·
High School What Defines a Planet?
- Aquafire
- · Replies 7 ·
Undergrad Sedna must be a planet (at least for now) according to new definition?
- ACG
- · Replies 7 ·
Graduate Superluminal Matter at Two Stages of Big Bang ?
- berkeman
- · Replies 1 ·
How Big is Earth Compared to the Sun?
- JamesU
- · Replies 18 ·
Earth Narrowly Escapes 2006 QM111 Asteroid Flyby
- tony873004
- · Replies 5 ·
Graduate Research Project Ideas - Taylor's Brainstorming
- TmanMrT
- · Replies 3 ·
The Astronomy Peer Review Process
- VikingF
- · Replies 12 ·
Graduate Possible webpage title: What Are the Possible Explanations for Dark Energy?
- Jan Janssens
- · Replies 1 ·
Interested in The Sky at Night webcasts?
- Kurdt
- · Replies 1 ·
Will a Satellite Crash into the Moon Tonight?
- DaveC426913
- · Replies 8 ·
Undergrad Why does higher density of the early universe result in a faster expansion rate?
- lwymarie
- · Replies 2 ·
Graduate How Does Precession Relate to Hindu Scriptures and Ancient Astronomy?
- navneet1990
- · Replies 4 ·
Graduate Big Bang : 'Proofs' and observations
- Neohaven
- · Replies 15 ·
Graduate Please shoot this, somebody (Laura Mersini-Houghton paper)
- marcus
- · Replies 5 ·
Graduate The Mystery of Ringed Planets: Uncovering the Cause
- FeynmanMH42
- · Replies 4 ·
Undergrad How close can planets safely exist from each other?
- ghost77
- · Replies 1 ·
High School Do All Planets Have Moons and How Did They Form?
- ghost77
- · Replies 1 ·
High School Is Space Just a Magnified Illusion of a Fluid Universe?
- soft_rain
- · Replies 6 ·
Graduate Can the Universe Be Understood as a Two-Dimensional Model?
- Futobingoro
- · Replies 3 ·
Graduate Is Infinity Possible? A Discussion on Hawking's Theories of the Universe
- Born2Perform
- · Replies 27 ·
Rare Astronomical Event Observed for the First Time
- neutrino
- · Replies 1 ·
Popular Cosmology Books - Which to Buy or Not?
- wolram
- · Replies 3 ·
Graduate Wolfgang Priester forsaw Big Bounce cosmology
- marcus
- · Replies 1 ·
High School Why Is Pluto No Longer Considered a Planet?
- poppop24
- · Replies 5 ·
Graduate Could Quasar Activity Explain the Distribution of Dark Matter in Galaxies?
- FeynmanMH42
- · Replies 7 ·
Graduate Was the Singularity Rotating at the Time of the Big Bang?
- jowjowman
- · Replies 10 ·
High School Earth, Sun & Galaxies: Physics of Movement
- mistersmith
- · Replies 6 ·
High School Mars Closest Encounter With Earth
- bioginz
- · Replies 1 ·
Undergrad Universe could be Bigger and Older - Move over 13.7 Gy
- neutrino
- · Replies 29 ·
Graduate What is the nature of Dark Matter?
- oldman
- · Replies 22 ·
Graduate Investigating an Unknown Hypothesis on Gravity Unequality
- Werg22
- · Replies 1 ·
Undergrad Calculating Limiting Magnitude for 12-Inch Telescope: Tips and Advice
- big man
- · Replies 3 ·
Graduate Locacal coordinate system in GR observed?
- hurk4
- · Replies 12 ·
Undergrad Now Its Official: Eight Planets (Pluto got bumped)
- Ouabache
- · Replies 7 ·
Undergrad Brightness of Mars as observed from earth
- lebbo
- · Replies 4 ·
High School Stars Burning in Space: Unanswered Questions
- MRCHEM
- · Replies 5 ·
Undergrad The moon moves in a near-circular orbit around earth
- lebbo
- · Replies 2 ·
High School Measuring in Space: How Sensors Work in the Cosmos
- japam
- · Replies 1 ·
Undergrad Rehash: speed of falling object at Earth's centre
- DaveC426913
- · Replies 16 ·
Call them DOLPHINS (not dwarf planets )
- marcus
- · Replies 3 ·
High School Only earth orbits in a circular motion?
- vtas25
- · Replies 19 ·
High School What Truly Defines a Vacuum?
- Swapnil
- · Replies 2 ·
Graduate Type Ia Supernovae: Implications for Cosmology
- wolram
- · Replies 34 ·
Graduate Why is our universe the way it is?
- fedorfan
- · Replies 31 ·
Graduate Why Does Light Bend Around Massive Objects?
- Cyclotron
- · Replies 21 ·
Graduate Planck black-box radiation and the universe
- hurk4
- · Replies 1 ·
High School What is the red circle near the moon phenomenon?
- DaveC426913
- · Replies 38 ·
Graduate Deriving Friedmann Equation from RW Metric - Blumfeld
- blumfeld0
- · Replies 3 ·
Graduate Solution to the lithium discrepancy
- EL
- · Replies 1 ·
Graduate What are the Origins and Characteristics of Cosmic Neutrinos?
- Orion1
- · Replies 1 ·
Graduate Expanding universe and Conservation of energy.
- Alistair
- · Replies 7 ·
Undergrad Doppler Effect and the Expanding Universe
- prochatz
- · Replies 12 ·
Graduate The Existence of the Red Ball Law: A Universal Truth?
- vinter
- · Replies 4 ·
Graduate Drake Equation: Parameters, Missed Factors & Technical Limits
- toph
- · Replies 2 ·
Graduate How are the Casimir Effect, Vacuum Energy, Inflation, and Dark Energy Connected?
- oldman
- · Replies 9 ·
Undergrad Just a question of planetary magnetism
- ChongFire
- · Replies 1 ·
Graduate Does the bending of light by objects affect our view of the universe as a whole?
- n0vadeath
- · Replies 4 ·
High School Galaxy Splitting: Has it Ever Occurred?
- sunblock
- · Replies 8 ·
Graduate Is the Multiverse Theory More Plausible Than Inflationary or Ekpyrotic Models?
- Vast
- · Replies 16 ·