Astronomy, Astrophysics, Cosmology Forum

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 ·
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13

High School Finding Cruithne's Orbit & Return to Earth's Orbit

  • thenodfather
  • · Replies 2 ·
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2

High School Earth's Celestial Poles: North and South

  • chill85
  • · Replies 1 ·
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1

Graduate The Supernova Legacy Survey (SNLS)

  • Astronuc
  • · Replies 3 ·
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3

Graduate No HUP, a universe without unknowns?

  • David Burke
  • · Replies 18 ·
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18

Graduate A question on the rate of time in the Light we observe

  • popfuzz
  • · Replies 2 ·
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2

Graduate New Nature Paper: Old Ia Supernovae different?

  • George Jones
  • · Replies 4 ·
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4

Will NASA's Hubble Servicing Mission Save the Telescope?

  • russ_watters
  • · Replies 1 ·
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1

Evaluate the pic : got a black spot in sun

  • mik0930
  • · Replies 2 ·
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2

Graduate Why Can't I Solve This Kepler's Law Problem Correctly?

  • takoma
  • · Replies 1 ·
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1

Graduate Are Extreme Internal Accelerations Significant in the Inflationary Universe?

  • oldman
  • · Replies 3 ·
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3

Graduate Is dark matter just an illusion?

  • Mk
  • · Replies 21 ·
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21

Graduate What Causes a White Dwarf Star to Exceed the Chandra Mass Limit and Explode?

  • Labguy
  • · Replies 4 ·
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4

Stargazing I want to build my telescope any advice ?

  • ranroun
  • · Replies 5 ·
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5

High School Astronomy in West LA: Can You Observe with a Telescope?

  • Quaoar
  • · Replies 5 ·
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5

Undergrad How Big Would A Planet Have To Be To Have Earth's Gravity?

  • SAZAR
  • · Replies 17 ·
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17

Graduate How can a neutronstar that only consists of neutrons

  • Hymne
  • · Replies 6 ·
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6

Undergrad Physical properties of objects that orbit each other in the universe

  • judi6070
  • · Replies 2 ·
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2

Graduate What is the mystery behind the puffy planet HAT-P-1?

  • Astronuc
  • · Replies 3 ·
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3

See Sunset from Space: Orange Clouds?

  • ncr7
  • · Replies 10 ·
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10

Graduate Double Lobed Radio Galaxies & Seyfert Galaxies: Similar Energy Sources?

  • blumfeld0
  • · Replies 1 ·
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1

Undergrad !Evidence of Star Formation in Molecular Clouds

  • blumfeld0
  • · Replies 5 ·
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5

Undergrad What if objects go toward each other rather than away

  • Skhandelwal
  • · Replies 2 ·
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2

Satellite Photo: Is It Plausible?

  • DaveC426913
  • · Replies 34 ·
2
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34

Undergrad Jupiter's Atmosphere: Questions & Answers

  • argonurbawono
  • · Replies 3 ·
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3

Graduate Can Light Be Multiply Scattered in the Universe?

  • oldman
  • · Replies 5 ·
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5

Stargazing Upgrade Telescopes: Get Into Astrophotography & Stargazing near LIGO

  • vincentm
  • · Replies 19 ·
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19

Graduate The cross section of a photon traversing the observable universe

  • Loren Booda
  • · Replies 16 ·
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16

Graduate Supernova 1987a, light, neutrinos, VSL claims

  • danriley
  • · Replies 17 ·
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17

Graduate New double pulsar testbed for GR and alts.

  • marcus
  • · Replies 0 ·
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0

Graduate CP violation and element forging

  • Pavel
  • · Replies 17 ·
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17

Graduate Could Gravitational Lensing Confirm the Existence of Dark Matter?

  • ham 'n eggs
  • · Replies 1 ·
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1

Graduate Gravity On Earth Dependant On Distance From Center

  • Darwin
  • · Replies 8 ·
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8

The Ultimate Question: What Created the Universe?

  • unscientific
  • · Replies 43 ·
2
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43

Graduate Just an idea I've been going over.

  • Arithus
  • · Replies 2 ·
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2

Graduate How Do You See Spectral Lines in Near IR from the Sun?

  • rp895
  • · Replies 1 ·
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1

Graduate Tiny Blackholes may pervade space

  • vincentm
  • · Replies 7 ·
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7

High School Pole Star Help: What Was the Pole Star 9-10,000 BC?

  • Myra759
  • · Replies 18 ·
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18

Graduate Wet planets common (new simulation study by Raymond et al)

  • marcus
  • · Replies 0 ·
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0

Graduate What Is the Role of Vacuum Fluctuations in the Universe's Origin?

  • RAD4921
  • · Replies 3 ·
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3

High School What Defines a Planet?

  • Aquafire
  • · Replies 7 ·
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7

Undergrad Sedna must be a planet (at least for now) according to new definition?

  • ACG
  • · Replies 7 ·
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7

Graduate Superluminal Matter at Two Stages of Big Bang ?

  • berkeman
  • · Replies 1 ·
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1

How Big is Earth Compared to the Sun?

  • JamesU
  • · Replies 18 ·
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18

Earth Narrowly Escapes 2006 QM111 Asteroid Flyby

  • tony873004
  • · Replies 5 ·
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5

Graduate Research Project Ideas - Taylor's Brainstorming

  • TmanMrT
  • · Replies 3 ·
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3

The Astronomy Peer Review Process

  • VikingF
  • · Replies 12 ·
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12

Graduate Possible webpage title: What Are the Possible Explanations for Dark Energy?

  • Jan Janssens
  • · Replies 1 ·
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1

Interested in The Sky at Night webcasts?

  • Kurdt
  • · Replies 1 ·
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1

Will a Satellite Crash into the Moon Tonight?

  • DaveC426913
  • · Replies 8 ·
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8

Undergrad Why does higher density of the early universe result in a faster expansion rate?

  • lwymarie
  • · Replies 2 ·
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2

Graduate How Does Precession Relate to Hindu Scriptures and Ancient Astronomy?

  • navneet1990
  • · Replies 4 ·
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4

Graduate Big Bang : 'Proofs' and observations

  • Neohaven
  • · Replies 15 ·
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15

Graduate Please shoot this, somebody (Laura Mersini-Houghton paper)

  • marcus
  • · Replies 5 ·
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5

Graduate The Mystery of Ringed Planets: Uncovering the Cause

  • FeynmanMH42
  • · Replies 4 ·
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4

Undergrad How close can planets safely exist from each other?

  • ghost77
  • · Replies 1 ·
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1

High School Do All Planets Have Moons and How Did They Form?

  • ghost77
  • · Replies 1 ·
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1

High School Is Space Just a Magnified Illusion of a Fluid Universe?

  • soft_rain
  • · Replies 6 ·
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6

Graduate Can the Universe Be Understood as a Two-Dimensional Model?

  • Futobingoro
  • · Replies 3 ·
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3

Graduate Is Infinity Possible? A Discussion on Hawking's Theories of the Universe

  • Born2Perform
  • · Replies 27 ·
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27

Rare Astronomical Event Observed for the First Time

  • neutrino
  • · Replies 1 ·
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1

Popular Cosmology Books - Which to Buy or Not?

  • wolram
  • · Replies 3 ·
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3

Graduate Wolfgang Priester forsaw Big Bounce cosmology

  • marcus
  • · Replies 1 ·
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1

High School Why Is Pluto No Longer Considered a Planet?

  • poppop24
  • · Replies 5 ·
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5

Graduate Could Quasar Activity Explain the Distribution of Dark Matter in Galaxies?

  • FeynmanMH42
  • · Replies 7 ·
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7

Graduate Was the Singularity Rotating at the Time of the Big Bang?

  • jowjowman
  • · Replies 10 ·
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10

High School Earth, Sun & Galaxies: Physics of Movement

  • mistersmith
  • · Replies 6 ·
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6

High School Mars Closest Encounter With Earth

  • bioginz
  • · Replies 1 ·
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1

Undergrad Universe could be Bigger and Older - Move over 13.7 Gy

  • neutrino
  • · Replies 29 ·
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29

Graduate What is the nature of Dark Matter?

  • oldman
  • · Replies 22 ·
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22

Graduate Investigating an Unknown Hypothesis on Gravity Unequality

  • Werg22
  • · Replies 1 ·
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1

Undergrad Calculating Limiting Magnitude for 12-Inch Telescope: Tips and Advice

  • big man
  • · Replies 3 ·
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3

Graduate Locacal coordinate system in GR observed?

  • hurk4
  • · Replies 12 ·
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12

Undergrad Now Its Official: Eight Planets (Pluto got bumped)

  • Ouabache
  • · Replies 7 ·
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7

Undergrad Brightness of Mars as observed from earth

  • lebbo
  • · Replies 4 ·
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4

High School Stars Burning in Space: Unanswered Questions

  • MRCHEM
  • · Replies 5 ·
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5

Undergrad The moon moves in a near-circular orbit around earth

  • lebbo
  • · Replies 2 ·
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2

High School Measuring in Space: How Sensors Work in the Cosmos

  • japam
  • · Replies 1 ·
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1
  • Poll Poll

Undergrad What Defines a Planet?

  • scott1
  • · Replies 14 ·
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14

Undergrad Rehash: speed of falling object at Earth's centre

  • DaveC426913
  • · Replies 16 ·
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16

Call them DOLPHINS (not dwarf planets )

  • marcus
  • · Replies 3 ·
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3

High School Only earth orbits in a circular motion?

  • vtas25
  • · Replies 19 ·
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19

High School What Truly Defines a Vacuum?

  • Swapnil
  • · Replies 2 ·
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2

Graduate Type Ia Supernovae: Implications for Cosmology

  • wolram
  • · Replies 34 ·
2
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34

Graduate Why is our universe the way it is?

  • fedorfan
  • · Replies 31 ·
2
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31

Graduate Why Does Light Bend Around Massive Objects?

  • Cyclotron
  • · Replies 21 ·
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21

Graduate Planck black-box radiation and the universe

  • hurk4
  • · Replies 1 ·
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1

High School What is the red circle near the moon phenomenon?

  • DaveC426913
  • · Replies 38 ·
2
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38

Graduate Deriving Friedmann Equation from RW Metric - Blumfeld

  • blumfeld0
  • · Replies 3 ·
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3

Graduate Solution to the lithium discrepancy

  • EL
  • · Replies 1 ·
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1

Graduate What are the Origins and Characteristics of Cosmic Neutrinos?

  • Orion1
  • · Replies 1 ·
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1

Graduate Expanding universe and Conservation of energy.

  • Alistair
  • · Replies 7 ·
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7

Undergrad Doppler Effect and the Expanding Universe

  • prochatz
  • · Replies 12 ·
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12

Graduate The Existence of the Red Ball Law: A Universal Truth?

  • vinter
  • · Replies 4 ·
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4

Graduate Drake Equation: Parameters, Missed Factors & Technical Limits

  • toph
  • · Replies 2 ·
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2

Graduate How are the Casimir Effect, Vacuum Energy, Inflation, and Dark Energy Connected?

  • oldman
  • · Replies 9 ·
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9

Undergrad Just a question of planetary magnetism

  • ChongFire
  • · Replies 1 ·
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1

Graduate Does the bending of light by objects affect our view of the universe as a whole?

  • n0vadeath
  • · Replies 4 ·
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4

High School Galaxy Splitting: Has it Ever Occurred?

  • sunblock
  • · Replies 8 ·
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8

Graduate Is the Multiverse Theory More Plausible Than Inflationary or Ekpyrotic Models?

  • Vast
  • · Replies 16 ·
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16