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
High School The highest resolution image of the Sun’s surface ever taken
- lomidrevo
- · Replies 3 ·
Undergrad Finite density at the BB preinflation epoch implies a finite universe?
- King Solomon
- · Replies 26 ·
Undergrad Is there an experimental proof that an Earth/Moon barycenter exists?
- Ron Hargrove
- · Replies 51 ·
Undergrad Earth-centered frame with Earth-Sun line fixed
- PeterDonis
- · Replies 3 ·
Undergrad Is the Pressure Inside a Black Hole So Intense That Atoms Cannot Hold Form?
- Karlox
- · Replies 21 ·
High School Other lines of evidence for Dark Energy? (Besides supernova data)
- Cerenkov
- · Replies 18 ·
Graduate Can there be a lawless universe (according to Hawking)?
- Suekdccia
- · Replies 1 ·
Undergrad Questions about the expansion of space on galactic scales
- KurtLudwig
- · Replies 13 ·
Undergrad Viewing Planets or stars from a high altitude
- Anand Sivaram
- · Replies 4 ·
Undergrad Cosmology in Crisis Podcast by LSST Scientists
- davenn
- · Replies 3 ·
High School Why does Jupiter have a stronger gravitational pull than Earth?
- Wondermine
- · Replies 13 ·
Undergrad DDO 68: A Young Galaxy Supporting the Steady State Theory
- SteadyStater
- · Replies 4 ·
Undergrad The solar system and the Coriolis effect
- Moises
- · Replies 4 ·
Undergrad Does the expanding Universe follow Lorentz contraction?
- Staticboson
- · Replies 44 ·
Undergrad Dark Energy as repulsive gravity
- Staticboson
- · Replies 6 ·
Undergrad How to calculate the wavelength of light coming from 1 light year away
- shantanu23
- · Replies 4 ·
High School Why is a gamma ray burst still gamma after traveling 6000 light years?
- Dinoduck94
- · Replies 1 ·
High School Why The Big Bang banged and didn’t collapsed into a black hole?
- Moon Shine
- · Replies 49 ·
Undergrad Is Dark Matter's Gravitational Force Weaker Than Visible Matter's?
- Ranku
- · Replies 11 ·
Undergrad Are there upper and lower limits to the inverse square law?
- KurtLudwig
- · Replies 6 ·
Undergrad Calculating solar zenith angle from position and time
- NotASmurf
- · Replies 9 ·
High School Is Dark Energy a Continuous Creation Theory?
- New Simplicio
- · Replies 14 ·
Undergrad Transformation matrix for an expanding space
- johnconner
- · Replies 54 ·
Undergrad What is power suppression in CMB experiments?
- windy miller
- · Replies 4 ·
Undergrad How Are Heavy Elements Distributed?
- jeff davis
- · Replies 12 ·
Graduate Definition of the IAU for the ecliptic plane
- member 672147
- · Replies 2 ·
High School Colliding Neutron Stars Collapse into Black Holes
- lavinia
- · Replies 2 ·
Undergrad How do you calculate the cool-down rate of the Universe?
- bbbl67
- · Replies 7 ·
The first British woman to space is a <can't say>
- phinds
- · Replies 14 ·
Undergrad Some new evidence that the Dark Energy Concept is wrong
- Buzz Bloom
- · Replies 10 ·
High School Can We Generate Detectable Gravitational Waves in a Lab?
- Suppaman
- · Replies 20 ·
High School Does new evidence against the dark energy assumption affect the age of the universe?
- .Scott
- · Replies 1 ·
Graduate Why is there no distance-measure in the standard model?
- Peter 727
- · Replies 6 ·
High School Matter falling into a black hole
- MikeeMiracle
- · Replies 8 ·
Undergrad Matter movement versus spacetime expansion
- Robin04
- · Replies 3 ·
Undergrad Can single stars exist closer than the closest binary systems?
- zuz
- · Replies 27 ·
High School CMB discovery prediction and redshift over cosmic time
- PainterGuy
- · Replies 4 ·
Graduate Understanding Ohm and Hall Diffusion in Cosmic Rays
- Pedro de la Torre
- · Replies 1 ·
Undergrad Computing B-V color index for a star cluster from component stars
- Astrofun42
- · Replies 1 ·
Undergrad What is the ultimate fate of the Universe?
- curious222
- · Replies 8 ·
Undergrad Why do dark matter and baryon matter have different distributions?
- Demystifier
- · Replies 4 ·
Undergrad Does gravity act differently on a Solar System, a Galasy, and the Universe?
- KurtLudwig
- · Replies 4 ·
High School The observable and non-observable parts of the Universe
- PainterGuy
- · Replies 38 ·
Graduate Three Body Problem - Statistical (almost) Solution
- Tom.G
- · Replies 2 ·
Graduate Does Teleportation to Andromeda Equal Time Travel?
- Maximum7
- · Replies 2 ·
High School Is Gravity Emergent? Answers to Pre-Big Bang Questions
- wolram
- · Replies 3 ·
High School A second galaxy with no dark matter
- wolram
- · Replies 5 ·
High School Who is Ethan Siegel and is what he says about the universe accurate?
- curious222
- · Replies 7 ·
Graduate Computing sig8 for correction in non-linear regime
- fab13
- · Replies 2 ·
Undergrad Calculating the Maximum total neutrino mass by using cosmological boun
- Arman777
- · Replies 6 ·
Undergrad Questions on Galactic Coordinate Systems
- KurtLudwig
- · Replies 8 ·
Stargazing Can I Use a DIY Hydrogen Alpha Solar Filter for Detailed Sun Photography?
- Remedyworld
- · Replies 11 ·
Undergrad Does dynamical friction explain flat rotation curves in spiral galaxies?
- Ranku
- · Replies 3 ·
Undergrad Visibility of celestial bodies during the daytime
- cptolemy
- · Replies 22 ·
Undergrad Is Minkowski spacetime a solution of the Friedmann Equations?
- timmdeeg
- · Replies 30 ·
High School How did the universe come into being?
- curious222
- · Replies 3 ·
High School Is this a star before it hit the ground on Earth?
- MeteoriteChina
- · Replies 14 ·
High School See the first precise pulsar surface map
- lomidrevo
- · Replies 2 ·
High School Dark Matter Distrbution in Galaxies
- MikeeMiracle
- · Replies 14 ·
Undergrad Does matter expand as space expands or are other forces preventing it?
- artis
- · Replies 17 ·
High School How can infinite universes with different physics avoid being detectable?
- Redblue88
- · Replies 11 ·
Graduate Alfred Nobel Symposium 2005: Energy in Cosmos, Molecules and Life
- Astronuc
- · Replies 1 ·
Undergrad Determining Degenerate Gas in Stellar Structure
- Haynes Kwon
- · Replies 1 ·
High School New Storms on Jupiter, by Juno spacecraft
- Tom.G
- · Replies 1 ·
Undergrad Why would a giant void like KBC solve the Hubble tension?
- Arman777
- · Replies 11 ·
Undergrad Is everything Lawrence Krauss said about the universe true?
- curious222
- · Replies 2 ·
High School What factors influence the flattening of planets in our solar system?
- JGHunter
- · Replies 9 ·
Undergrad Black hole discovery challenges stellar-mass limits
- lomidrevo
- · Replies 4 ·
Undergrad What existed before the Big Bang?
- curious222
- · Replies 12 ·
High School Is the universe finite and will the Big Bang eventually end?
- curious222
- · Replies 1 ·
Graduate Equation of state of gravitational energy in open de Sitter?
- Vincentius
- · Replies 6 ·
Undergrad Absorption lines and emission lines in stellar spectra
- Haynes Kwon
- · Replies 3 ·
High School Is the Universe's Expansion Misinterpreted Due to Curvature?
- PK is a fool
- · Replies 3 ·
High School Do charged cosmic ray sources create Reissner-Nordstrom black holes?
- William Nelso
- · Replies 16 ·
Undergrad Universe expansion discrepancy vs accelerated expansion
- overzealous
- · Replies 14 ·
High School Shouldn't the time dilation in cosmic voids be immense?
- staedtler
- · Replies 15 ·
High School What has Voyager 2 taught us from interstellar space?
- wolram
- · Replies 2 ·
Undergrad How do we determine the ##H_0## from standard rulers and standard candle?
- Arman777
- · Replies 20 ·
Undergrad Virial theorem problem
- Alfie114
- · Replies 4 ·
Undergrad True length of sidereal year in 6000 b.c.e.
- Edwin1974
- · Replies 28 ·
Undergrad First results from Parker Solar Probe on Wednesday (18:30 pm UTC)
- mfb
- · Replies 2 ·
Undergrad Building a solar system simulator
- Xilor
- · Replies 15 ·
High School Can Neutron Stars Lose Energy Through Radiation?
- magneticanomaly
- · Replies 10 ·
Undergrad Which redshift value is used in the velocity measurement of distance
- Arman777
- · Replies 3 ·
Undergrad Habitable Exoplanet Hunting Project within 100 light-years
- alberto91
- · Replies 10 ·
Undergrad Formation of dark matter structures
- andrew s 1905
- · Replies 4 ·
Undergrad What are Martin Bojowald's criticisms of loop quantum cosmology?
- windy miller
- · Replies 3 ·
Undergrad Does Dark matter get trapped in black holes and increase their mass?
- jms4
- · Replies 14 ·
Undergrad How did the initial dust particles form?
- hwpage
- · Replies 19 ·
High School Why Jupiter, Saturn and the Sun have a distinctive and sharp boundary?
- fbs7
- · Replies 34 ·
Undergrad Which instruments are used to determine the composition of dark matter?
- Wentu
- · Replies 3 ·
High School How Did the Early Plasma in the Universe Become Hot?
- wolram
- · Replies 2 ·
High School Could a large moon's tidal heating melt Mars's core?
- Bill McKeeman
- · Replies 18 ·
Undergrad How do we know space is expanding?
- Galactic explosion
- · Replies 24 ·
Undergrad What kind of information can we extract from this equation?
- Arman777
- · Replies 3 ·
Undergrad Fulvio Melia's new argument for a linear cosmology
- jcap
- · Replies 11 ·
High School Simulation of a Galaxy, most detailed large-scale simulation to date
- Spinnor
- · Replies 1 ·
High School Are supernovas more likely to produce neutron stars or black holes?
- Moon Shine
- · Replies 7 ·
Undergrad The Supergalactic plane and a coordinate system
- darkdave3000
- · Replies 15 ·
Undergrad Does gravitational lensing indicate dark matter is low-mass?
- Ranku
- · Replies 7 ·