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 Why is space expanding and matter including galaxies not shrinking?
- WW_III_ANGRY
- · Replies 19 ·
Graduate Hubble+/- 4.3%, is the constant constant ?
- MonstersFromTheId
- · Replies 2 ·
Graduate What Happens If You Travel Beyond the Edge of the Universe?
- Diffy
- · Replies 5 ·
Graduate Is The Definition Of A Singularity Incorrect?
- azzkika
- · Replies 10 ·
Undergrad Gravitation Force on the Earth's Centre
- xCross
- · Replies 2 ·
Graduate What is the speed of gravity and its relationship to light?
- OwenMc
- · Replies 2 ·
Graduate Temperature of the CMB, from WMAP
- Barnak
- · Replies 2 ·
Graduate Why Does the Speed of Light Have a Limit?
- PhanthomJay
- · Replies 28 ·
Graduate Is the energy and mass of the universe constant?
- azzkika
- · Replies 1 ·
Graduate Why Don't Cosmologists Consider Other OUs?
- 81+
- · Replies 13 ·
Graduate String fusion during the begining of our universe?
- Quasar2287
- · Replies 4 ·
Graduate How Does the Cosmological Constant Λ Define the Cosmic Scale of Space-Time?
- stevebd1
- · Replies 2 ·
High School Why cant u go to outer space like an upwards climbing roller coaster?
- eratosthenes2
- · Replies 4 ·
High School Is Matter Composed of Space and Energy?
- jado
- · Replies 3 ·
Undergrad Was the Early Universe Hot?
- John_Mason
- · Replies 7 ·
Graduate Orbit in space (extrasolar planets)
- Silly Lung
- · Replies 3 ·
Graduate Hubble ultra deep field - beyond the big bang
- diondrechsler
- · Replies 45 ·
Favorite books to read on subjects ranging from Astronomy
- Übermensch
- · Replies 37 ·
High School How does the movement of stars compare to the movement of planets
- robno9
- · Replies 12 ·
Graduate Statistical analysis of 600 historical Hubble constant measurements
- yuiop
- · Replies 1 ·
Graduate Pliers, pulsars and extreme physics
- Garth
- · Replies 1 ·
Undergrad Why Don't Galaxy Rotations Follow Kepler's Third Law?
- pixel01
- · Replies 3 ·
Undergrad Is our solar system average compared to other planetary systems?
- 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 Luminosity distance in Swiss cheese cosmology with randomized void sizes
- 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 without expanding space
- 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 how would it 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 Cosmological redshift as kinematic Doppler shift rather than space stretching
- wolram
- · Replies 3 ·
Undergrad Matter in space create red shift
- chosenone
- · Replies 15 ·
Stargazing How do eclipse calculation programs work?
- Prasanna Suman
- · Replies 6 ·
High School Refractor vs reflector telescopes: which principle is better?
- Adonis
- · Replies 17 ·
Graduate Can Our Universe Be in an Infinite Loop?
- steveg
- · Replies 1 ·
Graduate What does a 78 Glyr radius of curvature for the universe mean?
- 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 Missing 2 inch to 1.25 inch eyepiece adapter for Meade DS 114
- ReneeS
- · Replies 7 ·
High School Finding objects with a Meade DS114 telescope and H25mm, H12.5mm, SR4mm eyepieces
- ReneeS
- · Replies 1 ·
Undergrad How to get photometry from SDSS data
- 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 Liquid hydrocarbon lakes 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 How does space expansion move objects if gravity comes from spacetime curvature?
- 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 parameters
- 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 Proper speed of test particles released toward a receding galaxy
- 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 Venus and Uranus rotate opposite to other planets
- Philosophaie
- · Replies 3 ·
High School What Determines Earth's Yearly Cycle?
- biophysics
- · Replies 5 ·
Graduate How long until the universe cools enough for life, and properties of quark stars?
- TeeTeeKnow
- · Replies 4 ·
Graduate How reliable are Hubble images after traveling millions of light-years?
- b_dobro
- · Replies 7 ·
Graduate How does Arp-Narlikar's variable mass theory calculate cosmic distances from redshift?
- 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 Can we see the Big Bang if the universe is expanding away from us?
- b_dobro
- · Replies 11 ·