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 Having Trouble with ISIS Image Subtraction Method?
- beavez
- · Replies 1 ·
High School Walking on a sheet of grippy fabric in space.
- qpwimblik
- · Replies 6 ·
Graduate Theories and questions on the expansion of the universe
- Enquerencia
- · Replies 15 ·
Undergrad Vacuum energy density after inflation
- windy miller
- · Replies 4 ·
Undergrad Boltzmann brain paradox in an eternally expanding universe
- windy miller
- · Replies 4 ·
High School Will the Universe Eventually Go Dark?
- thetexan
- · Replies 8 ·
Undergrad Closure Phase - Interferometry - Recurrence Relation
- LmdL
- · Replies 1 ·
High School Does gravitation obey wave-particle duality?
- Swapnil Das
- · Replies 4 ·
High School Why does mass affect acceleration in weightless space?
- ponyboy3399
- · Replies 2 ·
Undergrad What is the History of Dark Matter?
- wolram
- · Replies 2 ·
Graduate Climate change impacts on future observatory site suitability
- pioneerboy
- · Replies 1 ·
High School Why is the redshift not the result of something else
- qpwimblik
- · Replies 6 ·
High School How charge-coupled devices accumulate and shift electrons in pixels
- Clever Penguin
- · Replies 16 ·
High School Chemical composition of relativistic neutron star jets?
- Bernie G
- · Replies 11 ·
Graduate Mass/Energy of Relativistic Jets?
- EskWIRED
- · Replies 15 ·
Graduate How Much Mass Is Ejected in Polar Jets?
- patellar-myotatic
- · Replies 4 ·
Undergrad Is Information Conserved in the Universe?
- windy miller
- · Replies 5 ·
High School Detecting Unusual Stellar Shapes: Looking for Perturbed Planets
- wolram
- · Replies 3 ·
Stargazing New Large Sunspot coming into view
- davenn
- · Replies 3 ·
Undergrad Aurora on Uranus? Why Are They In Large Dots?
- thebosonbreaker
- · Replies 1 ·
Undergrad Is Probability Meaningless in an Infinite Universe?
- windy miller
- · Replies 16 ·
Graduate Is Solar Wind Formed by Planetary Resonance and Solar Cycles?
- Buren
- · Replies 2 ·
Undergrad See How Andromeda Would Look if It Were Brighter
- George K
- · Replies 7 ·
High School Shouldn't dwarf planets be a subset of planets?
- Jupiter60
- · Replies 9 ·
High School Super-luminous Sphere Fading: Will Smaller or Larger Spheres Fade Away First?
- Einstein's Cat
- · Replies 5 ·
Undergrad Physics in a universe with instant communication
- EnumaElish
- · Replies 4 ·
High School Why are we still limited in our Moon exploration ambitions?
- Jeronimus
- · Replies 22 ·
High School Why does the moon appear to rock back and forth in the sky?
- thetexan
- · Replies 2 ·
Undergrad Position and Velocity in Heliocentric Ecliptic Coordinates
- Jenab2
- · Replies 3 ·
Undergrad Expansion of the universe, a poor choice of words?
- windy miller
- · Replies 44 ·
Graduate Two Black Holes' collision thought experiment
- George K
- · Replies 2 ·
Undergrad Understanding Etherington's reciprocity theorem
- voila
- · Replies 9 ·
High School Are galaxies part of constellations?
- wutronic
- · Replies 7 ·
Undergrad Mathematical Proof of Kepler's First Law of Orbits
- Memocyl
- · Replies 5 ·
High School Does Time Reverse Inside a Black Hole's Event Horizon?
- praveena
- · Replies 7 ·
Undergrad How Does Dark Matter Density Affect Galactic Rotation?
- cwdesign
- · Replies 7 ·
Graduate Viewpoint: Black Holes Produce Complexity Fastest
- QuantumQuest
- · Replies 0 ·
Undergrad How to calculate day length of a tidelocked double planet?
- AotrsCommander
- · Replies 2 ·
Undergrad Horizon Riddle (Infinite Horizon Problem)
- Whitehole
- · Replies 27 ·
High School Why doesn't the Moon get pulled into the Earth?
- cjp613
- · Replies 6 ·
High School How Much Should You Spend on a Moon Filter?
- sophiecentaur
- · Replies 15 ·
Undergrad Pluto's interaction with solar wind
- Ava_Seven
- · Replies 11 ·
Graduate The Big Rip - new evidence for it?
- Shlibby
- · Replies 25 ·
High School At what point would we stop seeing a star?
- thetexan
- · Replies 5 ·
Stargazing Large sunspot visible for 3-4 days in mid-April 2016
- davenn
- · Replies 38 ·
Graduate Will this setup work for backyard photometry?
- mishima
- · Replies 3 ·
Undergrad The universe doesn't have volume from outside?
- Tap Banister
- · Replies 2 ·
Undergrad New light shed on birth of the universe
- wolram
- · Replies 1 ·
Debunked: 15-year-old's Mayan city discovery via star maps
- jedishrfu
- · Replies 18 ·
Undergrad How Will Nano Spacecraft Reach Alpha Centauri?
- Nick Martin
- · Replies 5 ·
Undergrad Space Debris: Questions from a Newbie
- Daulet
- · Replies 2 ·
Undergrad Does positive curvature disprove eternal inflation?
- windy miller
- · Replies 6 ·
Undergrad Who first measured wavelength of absorption lines in stellar spectra?
- Ava_Seven
- · Replies 6 ·
Graduate How do we say that the universe we live is 3 dimensional?
- Altamash
- · Replies 4 ·
High School How to apply Einstein's STOR to expansion
- thetexan
- · Replies 11 ·
Undergrad How Small Can a Mass Be Squeezed?
- thetexan
- · Replies 12 ·
Undergrad Size of Universe: Exploring 13.7bn Years of Space
- Pete72
- · Replies 4 ·
High School What are the name and function of this apparatus
- Nicolas92i
- · Replies 3 ·
High School What do you call rocks that don't orbit the sun?
- LydiaJ
- · Replies 5 ·
Graduate Is there proof that black holes really exist?
- edguy99
- · Replies 2 ·
Stargazing Did You Catch These Amazing Stargazing Moments This Weekend?
- Andy Resnick
- · Replies 7 ·
Graduate Rotational universe without dark energy and dark matter?
- petergreen
- · Replies 11 ·
High School Is the Universe a Type of Fluid?
- Madefornomad
- · Replies 3 ·
High School What are the biggest misconceptions about black holes?
- 43zombiegit
- · Replies 127 ·
High School "Without Earth's atmosphere, cosmic rays would be lethal"
- bluemoonKY
- · Replies 9 ·
High School Calculating Orbital Velocity in 2D
- Torstein Bjelland
- · Replies 1 ·
High School Kepler Telescope Running in Safe Mode
- 1oldman2
- · Replies 5 ·
High School Expanding from and eventually to a singularity?
- Bran
- · Replies 16 ·
Undergrad Gravity assist and increasing orbital energy
- Physgeek64
- · Replies 6 ·
High School Did Stars Precede Life in the Universe?
- Hunter1234
- · Replies 6 ·
High School Does internal energy increase during gravitational collapse?
- mystreet123
- · Replies 4 ·
Undergrad Plotting number of halos per logarithmic bin
- allazar
- · Replies 1 ·
Undergrad Could it be so easy? (Why is space three-dimensional?)
- fresh_42
- · Replies 1 ·
High School Potential Organism Sustaining Planets
- akeleti8
- · Replies 5 ·
High School Hubble equation function of time
- Einstein's Cat
- · Replies 6 ·
Undergrad Where Can I Compare Star Spectra?
- Frank Einstein
- · Replies 3 ·
Undergrad Spacetime expansion and conservation of energy
- EasterEggs123
- · Replies 9 ·
Undergrad Experiment to Determine if Spacetime is Granular
- wolram
- · Replies 4 ·
High School How to contain an atmosphere in space?
- Frost Dragon
- · Replies 6 ·
High School Does a magnetic field accompany Jupiter's Great Red Spot?
- ZX.Liang
- · Replies 23 ·
Undergrad Inflation assumes ##\ddot{a}<0## after inflation?
- davidbenari
- · Replies 7 ·
Tyson Says It's 'Very Likely' The Universe Is a Simulation
- Buzz Bloom
- · Replies 7 ·
Undergrad Spatial homogeneity and the functional form of two-point functions
- Frank Castle
- · Replies 8 ·
Undergrad Evidence to support the theory of stellar nucleosynthesis?
- Hunter1234
- · Replies 3 ·
Undergrad Understanding Wiki's Milky Way Galaxy rotation chart
- hendoS
- · Replies 3 ·
Undergrad Hawking radiation and energy-negative energy pair production
- Rocha
- · Replies 4 ·
Undergrad What differentiates inflationary models from each other?
- windy miller
- · Replies 2 ·
High School Is expansion caused by unknown tension in space/time?
- thetexan
- · Replies 1 ·
Undergrad Comparing Earth's diameter with Moon's diameter
- prashant singh
- · Replies 2 ·
Graduate Does dark matter really carry five times the energy of ordinary matter?
- DLSieving
- · Replies 4 ·
Undergrad Calculating star radius and mass from spectral class, B-V index, and luminosity
- gunhed508
- · Replies 4 ·
Undergrad Calculation of mean energy value of photons in recombination
- eliot13
- · Replies 4 ·
Undergrad Exponential expansion of inflation
- Ranku
- · Replies 9 ·
Undergrad How can I calculate red shift for intragalactic bodies
- Frank Einstein
- · Replies 2 ·
High School How Can I Improve Pointing and Eyepiece Quality on My Dobsonian Telescope?
- sophiecentaur
- · Replies 13 ·
High School What percentage of the visible universe have we physically explored?
- iDimension
- · Replies 2 ·
Undergrad Is the influence of dark matter symmetric?
- nortonian
- · Replies 4 ·
Graduate April 23rd Magnetosphere Anomaly
- IbogaMoon
- · Replies 6 ·
High School Is the Big Bang a Result of a Spontaneous Singularity?
- thetexan
- · Replies 2 ·
Graduate Could we slow Mars's orbit to bring it closer to Earth's?
- tobyr65
- · Replies 29 ·