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 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 Debunking Dark Energy Theory: New Evidence Challenges Estimated Age of 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 What causes the mysterious eclipses in Epsilon Aurigae?
- zuz
- · Replies 27 ·
High School Questions about the cosmic microwave background radition and its discovery
- PainterGuy
- · Replies 4 ·
Graduate Understanding Ohm and Hall Diffusion in Cosmic Rays
- Pedro de la Torre
- · Replies 1 ·
Undergrad Help with the color of a star cluster
- 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 What Insights Does He Offer About the Universe?
- 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 Can Flat Rotation Curves in Spiral Galaxies Be Explained by Dynamical Friction?
- 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 Expansion of space & expansion of matter within space
- artis
- · Replies 17 ·
High School Infinite Universes: The Science & Limits of the Theory
- 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 What is the role of voids in 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 Is This Newly Discovered Black Hole Breaking The Rules of Stellar-Mass Limit?
- lomidrevo
- · Replies 4 ·
Undergrad Uncovering the Mystery: What Existed Before the Big Bang?
- curious222
- · Replies 12 ·
High School Universe Discovery: The Finite Theory of the Big Bang and the End of the Cosmos
- 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 Cosmic Rays Charge: Expect 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 Insights Has Voyager 2 Provided From Interstellar Space?
- wolram
- · Replies 2 ·
Undergrad How do we determine the ##H_0## from standard rulers and standard candle?
- Arman777
- · Replies 20 ·
Undergrad Help with the Virial Theorem please
- 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 Inside The 24/7 Search For Another Habitable Planet Within 100 Ly
- alberto91
- · Replies 10 ·
Undergrad Formation of dark matter structures
- andrew s 1905
- · Replies 4 ·
Undergrad Loop Quantum Cosmology: Explained in Layman's Terms
- 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 Molten Core of Mars: Could Tidal Action from a Moon Create a Magnetic Field?
- 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 Dark Matter Mass: Evidence of Low-Mass?
- Ranku
- · Replies 7 ·
Undergrad How Far Can the Square Kilometre Array 'Listen' for Extraterrestrial Signals?
- alberto91
- · Replies 22 ·
High School Lithium problem in Big Bang nucleosynthesis?
- Aidyan
- · Replies 2 ·
Undergrad Neutron Star Core: Empty Obloid Cavity & Exotic Content?
- Srb2001
- · Replies 9 ·
Graduate SPACE ROCKS: Latest meteorite into my collection
- davenn
- · Replies 3 ·
High School Meteor Storm Possible Thursday Night November 21-22
- websterling
- · Replies 5 ·
Graduate In the power spectrum, why is the peak frequency at the first harmonic
- dave gannon
- · Replies 5 ·
Undergrad Help With Simple Orbital Modeling
- Gumbrain
- · Replies 4 ·
Graduate Steps on the way to Lightcone cosmological calculator
- marcus
- · Replies 86 ·
High School Why do we assume the big bang created matter/antimatter?
- physical
- · Replies 2 ·
Undergrad Can S5-HVS1 Retain Its Planets?
- DavidCummings
- · Replies 2 ·
Undergrad Clarifying the Meaning of Radius of Curvature in Cosmology
- Arman777
- · Replies 13 ·
Undergrad New measurement of the Hubble constant is consistent with the CMB value
- phyzguy
- · Replies 10 ·
Graduate Calculating the Gravitational wave spectrum with Inflation as a source
- shinobi20
- · Replies 3 ·
Graduate Missing step in the derivation of the Robertson-Walker metric
- Roy_1981
- · Replies 31 ·
Undergrad Why is there a difference between the composition of planets and stars?
- artis
- · Replies 28 ·
High School How constrained are the initial conditions of the universe?
- Quantum Alchemy
- · Replies 1 ·
High School Water found on potentially habitable exoplanet
- phinds
- · Replies 8 ·
Stargazing Witness the Transit of Mercury: Nov 11, 2019
- Andy Resnick
- · Replies 13 ·
Undergrad Cuspy Halo Problem: Questions & Answers
- Arman777
- · Replies 5 ·
High School Will Big Stars Turn Into Red Supergiants or Red Giants?
- Odette
- · Replies 5 ·
High School If I were to observe a black hole....
- PG1
- · Replies 19 ·
Undergrad Angular Momentum in a Solar Nebula
- Comeback City
- · Replies 7 ·