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
Undergrad What Makes Our Solar System Special?
- wolram
- · Replies 7 ·
Graduate Is the Universe's Expansion Constant or Accelerating?
- TalonD
- · Replies 1 ·
Graduate Are the Cosmological Coincidences Just a Matter of Chance?
- Garth
- · Replies 46 ·
Will the universe run out of energy?
- avant-garde
- · Replies 12 ·
Graduate Swiss Cheese" Cosmology: Luminosity Dist. & Single Void Size
- wolram
- · Replies 6 ·
Graduate Spin angular momentum of black hole
- spidey
- · Replies 1 ·
Undergrad What is the relationship between the speed of light and the meter?
- TalonD
- · Replies 3 ·
Graduate Superluminal Recession & Cosmological Redshift
- jonmtkisco
- · Replies 39 ·
Graduate What Defines Safe Orbital Distances for Planetary Bodies?
- Insanity
- · Replies 2 ·
Graduate Light Waves at Edge of Universe Question
- justwondering
- · Replies 13 ·
Graduate Universe as Computer Sim. - Practical Considerations
- peter0302
- · Replies 14 ·
Graduate Slower rotation curves at centre
- Zman
- · Replies 3 ·
Graduate How is the Velocity of Ejection Related to Quasar Redshift?
- Harry2005
- · Replies 9 ·
Graduate Holographic Principle Research Paper
- fauyd
- · Replies 4 ·
All our information comes from light
- wolram
- · Replies 4 ·
Graduate What causes space time to come into existence?
- mathius
- · Replies 7 ·
Undergrad How constant are constants? - ice skating
- harrisonorbit
- · Replies 14 ·
Graduate Could Negative Mass Exist and Affect Black Holes?
- jumpjack
- · Replies 19 ·
Graduate How Do We Understand the Size and Limits of the Universe?
- Diffy
- · Replies 8 ·
Graduate Sim of first star formation (100 solar typical)
- marcus
- · Replies 1 ·
Graduate Kinematic Origin of Cosmological Redshift: Bunn & Hogg
- wolram
- · Replies 3 ·
Undergrad Matter in space create red shift
- chosenone
- · Replies 15 ·
Stargazing Calc Eclipse Any Loc: What Softwares Do?
- Prasanna Suman
- · Replies 6 ·
High School Best Telescope: Refractor vs Reflector
- Adonis
- · Replies 17 ·
Graduate Can Our Universe Be in an Infinite Loop?
- steveg
- · Replies 1 ·
Graduate The Size of the Universe: Does 78 Glyr Radius Make Sense?
- VEReade
- · Replies 11 ·
Undergrad Determining Sun-Earth Distance: Parallax vs. Kepler's Law
- Zman
- · Replies 3 ·
Graduate Radius of a star as a function of wavelength
- natski
- · Replies 1 ·
Undergrad Why Does Blue Light Travel Faster Than Red in the Milky Way?
- Zman
- · Replies 1 ·
Graduate If the big crunch theory is correct, Then wouldn't history repeat itself?
- thewhills
- · Replies 5 ·
Graduate Black holes responsible for missing ET?
- dilletante
- · Replies 8 ·
Stargazing Help get my telescope functional?
- ReneeS
- · Replies 7 ·
High School What Eye Pieces Work Best for Beginners with a Meade DS114 Telescope?
- ReneeS
- · Replies 1 ·
Undergrad Photometry of SDSS Data: A How-To Guide
- randa177
- · Replies 4 ·
Graduate Direct Evidence of Dark Energy (?)
- Atakor
- · Replies 7 ·
High School Could a Cosmic Explosion Propel a Space Probe Beyond Our Solar System?
- Mackay1011
- · Replies 1 ·
Graduate Why Does the Equation for a Star's Central Pressure Become Singular at r=0?
- arunma
- · Replies 5 ·
High School Can the Hubble Telescope Detect Life on Distant Planets?
- Mackay1011
- · Replies 2 ·
Undergrad Gravitational equilibrium between earth and sun
- cokerrm
- · Replies 13 ·
Graduate The constancy of the energy of the universe?
- Cygni
- · Replies 26 ·
Graduate Expansion acceleration an anomaly?
- ThomasT
- · Replies 17 ·
Stargazing Is It Safe to Watch a Sunset Eclipse?
- pixel01
- · Replies 9 ·
Graduate Can Black Holes Create Baby Universes?
- math_04
- · Replies 3 ·
Graduate Can dark matter be just a cloud of protons?
- protonic_mass
- · Replies 15 ·
High School Scientists Discover Liquid on Saturn's Moon Titan
- bassplayer142
- · Replies 3 ·
Graduate The physical meaning of expansion in cosmology
- marcus
- · Replies 32 ·
Undergrad Accelerometer xyz anlges to ra/dec
- samkane
- · Replies 1 ·
Graduate What is the level of precision in the universe?
- aquaregia
- · Replies 5 ·
Graduate New model for the Shape of the Universe?
- BigRedJeffro
- · Replies 1 ·
Undergrad Does Hubble's law rely on the Doppler shift?
- Loren Booda
- · Replies 5 ·
Graduate Confused about space expansion? Me too.
- azzkika
- · Replies 5 ·
Graduate Is the Universe's Expansion Due to Mass Loss or a Repulsive Force?
- cryptomorph
- · Replies 4 ·
Graduate WMAP 5 Year Data Release: Cosmological Interpretation
- cristo
- · Replies 23 ·
Graduate Distance and the Hubble’s Constant
- mysearch
- · Replies 29 ·
Graduate Axiomatic Universe: Philosophical Point of View
- captain
- · Replies 2 ·
Undergrad Narrowing Hubble's Constant - 8 year study concludes
- Chaos' lil bro Order
- · Replies 8 ·
Graduate Is the Total Energy of the Universe Zero or Constant?
- deneve
- · Replies 7 ·
High School Hubble's Law: Can somone be nice and answer this.
- XxBioFrenzyxX
- · Replies 2 ·
Graduate Observing Quasar Accretion Disks: Scientists See Standard Cosmology at Work
- marcus
- · Replies 4 ·
High School Scientists find the trigger of the Northern Lights
- MedLine
- · Replies 2 ·
Graduate Could we expect that temperature of CMB decreases or increases?
- Ignition
- · Replies 2 ·
Graduate Does the fabric of space-time move faster than the speed of light?
- artie
- · Replies 1 ·
Graduate The Mystery of Superluminal Recession Velocities in Cosmology
- jonmtkisco
- · Replies 138 ·
Graduate Interpreting Friedmann’s Equation?
- mysearch
- · Replies 15 ·
High School What Would Happen if the Sun Was Blue?
- Nibles
- · Replies 15 ·
High School JPL Website Wrong: Venus & Uranus Rotate Opposite
- Philosophaie
- · Replies 3 ·
High School What Determines Earth's Yearly Cycle?
- biophysics
- · Replies 5 ·
Graduate Big Bang, Life & Quark Stars: How Long Before We're Cool?
- TeeTeeKnow
- · Replies 4 ·
Graduate Real Pictures from Space: Are We Seeing Authentic Light Waves?
- b_dobro
- · Replies 7 ·
Graduate Alternative cosmology: the arp-narlikar's variable mass theory
- dan74
- · Replies 30 ·
Graduate Accelerating Universe and the Loss of Mass
- MisterBig
- · Replies 4 ·
Undergrad Can We Find Fossilized Remains on Mars?
- Ai52487963
- · Replies 1 ·
Graduate How did the quantum fluctuations in the inflationary universe turned classical?
- chronnox
- · Replies 2 ·
Graduate Is the Copernican Principle Valid?
- 81+
- · Replies 5 ·
Graduate The universe's boundaries and origins
- thomasxc
- · Replies 25 ·
Graduate How Does Dark Energy Relate to the Cosmic Microwave Background?
- ThomasT
- · Replies 5 ·
High School What is the Current Position of Planets in the Solar System?
- DaveC426913
- · Replies 4 ·
Undergrad Big Bang & Doppler Effect: Viewing Start of Universe?
- b_dobro
- · Replies 11 ·
Graduate How much do we know about gravity?
- Desiree
- · Replies 13 ·
Graduate What Lies Beyond Our Observable Universe?
- Dragohunter
- · Replies 5 ·
Urban Stargazing in Orange County - Is it Possible?
- Ki Man
- · Replies 5 ·
Graduate Can Matter and Energy Travel Faster Than Light at the Big Bang?
- glueball8
- · Replies 16 ·
Graduate Is a Universe Without Matter Possible?
- Peter (IMC)
- · Replies 4 ·
Graduate Latest word from Lewis, Francis et all on radar ranging
- jonmtkisco
- · Replies 6 ·
Graduate Is the End of the Universe Beautifully Explained in Krauss & Scherrer's Article?
- marcus
- · Replies 5 ·
Undergrad Traversing the milky way galaxy when?
- Desiree
- · Replies 10 ·
Graduate What is the accepted theory on universe expansion?
- epkid08
- · Replies 15 ·
Undergrad What is the relationship between velocity and distance in a stable orbit?
- atom888
- · Replies 8 ·
Undergrad The Ultimate Spinning Universe: Does It End?
- PhanthomJay
- · Replies 21 ·
Stargazing Looked through an observatory telescope for the first time today
- Daniel Y.
- · Replies 4 ·
New Gorgeous Video from Deep Impact
- sysreset
- · Replies 5 ·
Graduate What is the relationship between entropy and the universe?
- ThomasT
- · Replies 8 ·
Graduate Why don't galaxies move faster then c?
- madmike159
- · Replies 27 ·
Graduate Forces Outside Our Observable Universe?
- 81+
- · Replies 2 ·
Graduate Difference between expansion of space and objects just moving apart?
- ThomasT
- · Replies 52 ·
Undergrad Will Uranus Ever Be Tidal-Locked to the Sun?
- pixel01
- · Replies 3 ·
Graduate Pioneer 10 and 11 anomylous acceleration
- Chaos' lil bro Order
- · Replies 16 ·
Undergrad Question about Jupiter atmosphere
- fluidistic
- · Replies 5 ·
Graduate Formation of Voids: Unclear Picture
- hellfire
- · Replies 8 ·
High School Should we Makemake anything about the name?
- Ai52487963
- · Replies 5 ·