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 Big Bang Temperature - What Was It?
- Stephanus
- · Replies 6 ·
Graduate Would a supermassive black hole explode?
- newjerseyrunner
- · Replies 5 ·
Stargazing Problem in making a small refracting Telescope
- Ibrahim Hany
- · Replies 3 ·
Graduate Is Dark matter an optical illusion?
- Zimbler Igor
- · Replies 1 ·
High School Are there any "Polar" solar system structures?
- Jimster41
- · Replies 10 ·
Undergrad Do distant stationary objects move apart due to space expanding?
- iDimension
- · Replies 5 ·
Graduate Calculating the event horizon of black holes.
- William Henley
- · Replies 5 ·
Undergrad Redshift, Earth's orbital speed, and the speed of light
- iantresman
- · Replies 1 ·
Undergrad Using the Suns gravity for propulsion
- Scaledriver
- · Replies 17 ·
Stargazing Why is there no Hubble-like telescope on the International Space Station?
- Bob__
- · Replies 6 ·
Graduate Predicting angle of deflection of light
- William Henley
- · Replies 7 ·
Graduate How many cubic planck lengths are in the observable universe?
- Alex299792458
- · Replies 7 ·
Undergrad Loss of mass of an object falling through air
- Sumit Adhikari
- · Replies 8 ·
High School Conservation of momentum of collision
- sander2798
- · Replies 2 ·
Graduate Are there multiverse models with infinte regress?
- Philm
- · Replies 1 ·
Graduate Simple no-pressure cosmic model gives meaning to Lambda
- marcus
- · Replies 105 ·
New Horizons Sees First Features on Pluto
- Drakkith
- · Replies 13 ·
Graduate Observational difference between OS and FLRW
- wabbit
- · Replies 27 ·
Graduate Can NASA's Impossible EM Drive Revolutionize Space Travel?
- jimmylegss
- · Replies 2 ·
Graduate Do Dark matter and Dark energy interact?
- wolram
- · Replies 1 ·
Graduate Mass of a galaxy without dark matter and with dark matter
- Quarlep
- · Replies 37 ·
Can you see the atmosphere with you eyes or only through photos? (In space)
- Tyrion101
- · Replies 6 ·
Graduate How does the universe harness temperature differences to build structures?
- techmologist
- · Replies 80 ·
Graduate Is the Multiverse of Cantor Dust a Viable Solution to Olbers' Paradox?
- slatts
- · Replies 4 ·
Undergrad Which laptop operating system do astronomers most often use?
- Omega Force
- · Replies 2 ·
Graduate Observing galaxies that recess faster than c
- virgil1612
- · Replies 48 ·
Graduate Complex cyanides detected in protoplanetary disk around MWC 480
- DennisN
- · Replies 5 ·
Graduate Can supernovas eject stars from their orbits?
- Stephanus
- · Replies 5 ·
Graduate Looking for the complete fusion process inside our Sun.
- Dyatlov
- · Replies 2 ·
Graduate How much energy do we need to make an expanding universe?
- Quarlep
- · Replies 55 ·
Graduate Cold Spot in Cosmic Background Radiation
- Hugh Parker
- · Replies 1 ·
Undergrad Dark Matter is baryonic matter passed through a black hole?
- Silenus
- · Replies 3 ·
Graduate Can a Black Hole Form Directly from a Collapsing Protostar Cloud?
- Vrbic
- · Replies 19 ·
Undergrad Globular cluster luminosity function
- John Titor
- · Replies 3 ·
Graduate Cosmological and doppler redshift
- throneoo
- · Replies 2 ·
Graduate Do gravitational waves distort spacetime or travel with it?
- wolram
- · Replies 14 ·
Graduate Marcus's 'no-pressure' model in different jacket
- Jorrie
- · Replies 4 ·
Why is the Moon going above Jupiter in the sky?
- Raghav Gupta
- · Replies 16 ·
Graduate Is Neutron Star Energy a Disappointment for Nuclear Renewables?
- jlefevre76
- · Replies 16 ·
Stargazing Upgrade Your Telescope Today: Top 10-Inch Aperture Options Under £600
- MrRasta230
- · Replies 3 ·
M51 photo with 1 hour integration at 800mm f/5.6 ISO 2000
- Andy Resnick
- · Replies 7 ·
Graduate Life and matter in exotic spatial conditions
- Ghostcrown
- · Replies 1 ·
Graduate How would Pluto and Charon appear from Earth if both tidally locked in nested orbits?
- TheDarkFrontie
- · Replies 10 ·
Graduate What Was Space and Time Before the Big Bang?
- Emre Deveci
- · Replies 2 ·
Graduate Calculating albedo and eccentricity
- Chief17
- · Replies 3 ·
Undergrad Can Non-Destructive Methods Stop a Giant Asteroid from Hitting Earth?
- GladScientist
- · Replies 9 ·
High School What happens if we launched a shot from a pistol in space?
- Dr.ahmad adnan
- · Replies 1 ·
Graduate Discrete steps in dispersion measures of fast radio bursts
- Garth
- · Replies 63 ·
Graduate How Do We See The Background Radiation?
- bitznbitez
- · Replies 9 ·
Undergrad What Happens if a Black Hole Dies or Disappears?
- Emmanuel_Euler
- · Replies 8 ·
What stars/star systems can I see tonight?
- leroyjenkens
- · Replies 5 ·
High School Is Oxygen-Based Life Possible in Other Galaxies?
- Swetha.M.L
- · Replies 3 ·
Undergrad Re. Dark matter. Concept of nothing
- Philip Carvey
- · Replies 2 ·
Graduate Standard candle - in question - affects distance estimates
- jim mcnamara
- · Replies 46 ·
Graduate Flat galaxy rotation curves without dark matter
- Mike Stalkfleet
- · Replies 1 ·
Undergrad Which is the most powerful black hole or a worm hole and why
- Dr.ahmad adnan
- · Replies 4 ·
Graduate How to check a statement about orbital angles of exoplanets?
- Fabioonier
- · Replies 2 ·
Graduate How can BAO and SN constraints be compared for measuring dark energy?
- wolram
- · Replies 5 ·
Graduate What is the Purpose of Fitting Supernova Remnant Spectra?
- coca-cola
- · Replies 1 ·
Graduate Can a Single Particle Move in an Empty Universe?
- CaptDude
- · Replies 8 ·
CRAYFIS Initiative: Is it Worth Joining?
- Frimus
- · Replies 1 ·
Undergrad How scientists have measured universe?
- bilal99uzzzz
- · Replies 8 ·
Undergrad Olbers' paradox and infinite number of stars
- brianhurren
- · Replies 16 ·
Graduate Why Does Luminosity Drop Before a Star Becomes a White Dwarf?
- virgil1612
- · Replies 17 ·
Centaurus A image from a 27.5 inch telescope
- Drakkith
- · Replies 18 ·
Omega Centauri: Amazing Image from 2-Month Clear Night
- davenn
- · Replies 2 ·
NASA pictures of dark matter collisions
- jim mcnamara
- · Replies 66 ·
Graduate Saha equation partition function for Argon?
- randombill
- · Replies 5 ·
Undergrad Much ado about (almost) nothing ?
- diogenesNY
- · Replies 1 ·
Graduate Which stage of the sun consists neutron star/stars
- Dr.ahmad adnan
- · Replies 3 ·
High School From what dark matter in space consist of?
- Dr.ahmad adnan
- · Replies 9 ·
Astronomy Calendar of Celestial Events
- Greg Bernhardt
- · Replies 17 ·
Graduate Looking for free downloadable articles on primordial He
- houlahound
- · Replies 1 ·
Graduate Visualizing a wormhole and black hole for Interstellar
- marcus
- · Replies 3 ·
Undergrad Why is the sun mostly hydrogen if heavy elements sank to the center?
- johnmtb
- · Replies 10 ·
Graduate Can a radius of curvature be calulated from omega-k?
- Buzz Bloom
- · Replies 1 ·
Different understanding of the universe if .
- Low-Q
- · Replies 2 ·
Graduate Scientists observe potential signs of dark matter
- wolram
- · Replies 7 ·
Graduate What does a dimensionless universe mean?
- Rodrigo Cesar
- · Replies 9 ·
Graduate Fitting a model to astronomical data
- Buzz Bloom
- · Replies 2 ·
Graduate How was matter distributed in the ionized plasma before photon decoupling?
- orricl
- · Replies 8 ·
Undergrad Why are astronauts weightless en route to the moon?
- danlightbulb
- · Replies 20 ·
Undergrad Which self-contained Big Bang models do cosmologists favor?
- Philm
- · Replies 3 ·
Graduate Light clocks measure conformal time - detailed argument
- jcap
- · Replies 12 ·
Undergrad Where Did the Emptiness for the Big Bang Come From?
- HIGHLANDER TONY
- · Replies 34 ·
High School How does time expand?
- neatoizer
- · Replies 12 ·
Graduate Equilibrium at Universe (possible?)
- ChrisVer
- · Replies 4 ·
Graduate Heated balloon analogy for dark energy and cosmological expansion
- PWiz
- · Replies 6 ·
Graduate Acceleration of expansion of Universe not that fast?
- SpiderET
- · Replies 2 ·
Undergrad Why do geosynchronous satellites have to orbit above the Equator?
- question dude
- · Replies 6 ·
Graduate Did early cosmic microwave background radiation appear as visible light?
- martix
- · Replies 19 ·
What Does Pluto Really Look Like?
- diogenesNY
- · Replies 3 ·
Undergrad Is the CMB unique to our galaxy or present in all galaxies?
- wolram
- · Replies 6 ·
Undergrad Absolute magnitude and luminosity
- Rohan1997
- · Replies 2 ·
Graduate Precession of Mercury and period of rotation
- vinven7
- · Replies 1 ·
Undergrad Studying Astronomy: Struggling with Cosmology Maths
- mrjaffa
- · Replies 4 ·
Graduate Does the Higgs field mean that space has energy?
- David McArthur
- · Replies 2 ·
Graduate What does the abbreviation YP stand for?
- Buzz Bloom
- · Replies 4 ·
Undergrad Why can't we reach to Speed of light at Space?
- Majid1986
- · Replies 122 ·
Graduate Can axions make up dark matter?
- wolram
- · Replies 23 ·