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 "Scientists have measured space to be flat to high accuracy"
- sevensages
- · Replies 13 ·
Stargazing Solar Activity and Space Weather Update thread
- Stavros Kiri
- · Replies 466 ·
Thought Experiment: What Lies Beyond the Furthest Object in Space?
- Amazed
- · Replies 11 ·
High School What if we could use a Black Hole as starship?
- Fabien
- · Replies 17 ·
Undergrad Does the steady-state model resolve Olbers' paradox?
- Jaime Rudas
- · Replies 61 ·
Undergrad Theta Eridani was much brighter for early astronomers
- mfb
- · Replies 1 ·
High School Good drawing of Earth's orbit for model? Possibly vector file?
- LightningInAJar
- · Replies 38 ·
Undergrad Intelligent life and the Fermi Paradox
- Jupiter60
- · Replies 9 ·
High School Long rod in orbit
- GTOM
- · Replies 21 ·
High School Help with the protocol for accurately recording an orbit for the IAU
- Celesty
- · Replies 3 ·
The James Webb Space Telescope
- valenumr
- · Replies 545 ·
High School Will we ever communicate with extraterrestial life in a reasonable time frame?
- Frimus
- · Replies 3 ·
High School Spotting 1997 NC1 flyby on Fri/Sat
- DaveC426913
- · Replies 2 ·
High School 3I/ATLAS, Interstellar Comet
- Astronuc
- · Replies 22 ·
Undergrad Hubble Constant, Dark Energy and the Expanding Universe
- PhanthomJay
- · Replies 22 ·
Undergrad Cosmological Redshift and Expansion
- Jaime Rudas
- · Replies 51 ·
High School Dark energy might not be constant after all
- Filip Larsen
- · Replies 12 ·
High School Anyone come across this new YouTube channel?
- pbuk
- · Replies 19 ·
What is the word for the momentum of the Earth orbiting the Sun?
- sevensages
- · Replies 3 ·
High School Formation of gravastars
- Sagittarius A-Star
- · Replies 9 ·
Graduate Could the Foucault precession be an incomplete forcing?
- Simon F
- · Replies 2 ·
Do you 'see' the CMB map as a 3D glass sphere/ellipsoid?
- Roberto Pavani
- · Replies 1 ·
High School The One Electron Universe suggested by Wheeler
- Parthib Roy
- · Replies 10 ·
High School A question on the geometry of black holes
- Parthib Roy
- · Replies 57 ·
High School Near-Earth Object/Asteroid 2026 JH2
- Astronuc
- · Replies 2 ·
The Universe’s Brightest Explosions Were Discovered by Accident
- spacestorm
- · Replies 2 ·
High School Can a black hole become a white hole?
- member 775858
- · Replies 7 ·
High School GRB 250702B, the longest gamma-ray burst in history
- Astronuc
- · Replies 6 ·
High School Could the interstellar medium distort alien signals?
- Line_112
- · Replies 2 ·
Stargazing TRAPPIST-1 system
- hmrgee
- · Replies 1 ·
Undergrad Practical cosmic speed limit for macroscopic objects?
- BWV
- · Replies 15 ·
Undergrad Are Alternative Dark Energy Models Treated More Favorably Than MOND?
- BWV
- · Replies 13 ·
Undergrad Dumb Dumb has a question (standard candles)
- Murphy625
- · Replies 3 ·
Undergrad Ice on the moon
- thetexan
- · Replies 10 ·
Undergrad Does Spacetime rotate like a vortex?
- james_bellhouse
- · Replies 6 ·
High School Theory on universe expansion
- JackFmultiverse
- · Replies 4 ·
Undergrad Help Understanding the Hubble Constant's Units
- skynr13
- · Replies 22 ·
High School Deflection of Light by the Sun
- nanjo
- · Replies 3 ·
Stargazing Astronomy: Orbit Terminology
- Pixelworks
- · Replies 41 ·
High School Size of the early universe as we see now
- stuart100
- · Replies 1 ·
Undergrad Live data from Artemis 2?
- LightningInAJar
- · Replies 6 ·
Undergrad Is our definition of 'cosmic voids' misleading the H₀ discussion?
- qql504
- · Replies 1 ·
Undergrad Large Synoptic Survey Telescope -> Vera C. Rubin Observatory
- mfb
- · Replies 15 ·
High School Infinite universe, infinite volume from the beginning?
- mister i
- · Replies 22 ·
Stargazing Meteor/meteorite made a big boom this morning!
- Andy Resnick
- · Replies 19 ·
High School ASASSN-15lh (aka SN 2015L), a superluminal supernova, or hypernova?
- Astronuc
- · Replies 9 ·
High School Uracil found in carbonaceous asteroid
- BWV
- · Replies 10 ·
High School Independent Inflationary Regions in an Infinite Universe?
- mister i
- · Replies 28 ·
Graduate Why are the bulge particles coming out in the Gadget 2 simulation?
- bijuastro
- · Replies 2 ·
Undergrad Age of the Universe and the Cosmological Constant
- Ranku
- · Replies 18 ·
Undergrad A paper regarding the Hubble tension using Gaia data
- pinball1970
- · Replies 3 ·
Undergrad What part of Mars Rover or Mars satellite has this cone object fallen from?
- Julian_M
- · Replies 10 ·
Undergrad M31-2014-DS1, slow disappearance of a massive star
- Astronuc
- · Replies 1 ·
High School A Mind-Boggling Number Comparison
- peanutaxis
- · Replies 54 ·
Undergrad Abundant water from primordial supernovae at cosmic dawn
- Astronuc
- · Replies 1 ·
Undergrad Exoplanet, HD 137010 b and it's star, HD 137010
- Astronuc
- · Replies 0 ·
Undergrad Question of accuracy of galactic collision simulations
- Halc
- · Replies 11 ·
Graduate Project Progress Report and possible Radio Astronomy Technique?
- Paul Colby
- · Replies 9 ·
High School What is space?
- stephen h
- · Replies 13 ·
Undergrad Is Vacuum Decay from a False to True State Impossible or Just Unlikely?
- Suekdccia
- · Replies 3 ·
Graduate Larson-Sekanina Rotational Gradient Filter for comet 3i/Atlas
- Julian_M
- · Replies 0 ·
Undergrad Milne vs. Minkowski metric
- PAllen
- · Replies 30 ·
Undergrad Comparing different scale factor functions in the same graph
- hedgehug
- · Replies 6 ·
Undergrad Does the scale factor need to be normalized?
- hedgehug
- · Replies 93 ·
Undergrad Blueshift in case of the Big Crunch scenario
- hedgehug
- · Replies 9 ·
Undergrad Are Boltzmann brains predicted by our current cosmological theories?
- grassyourhorse
- · Replies 12 ·
Undergrad Unexpected findings in need of an explanation (retrograde motion of Mars)
- Sylvain9595
- · Replies 83 ·
Undergrad Rotation curve in spiral galaxy velocity and uniform velocity dispersion
- Ranku
- · Replies 4 ·
High School Contradictions in the Distribution of Gamma-Ray Bursts
- Line_112
- · Replies 24 ·
High School Expansion and raisin bread
- John Helly
- · Replies 5 ·
High School Questions about the structure of dark matter
- untilthecern
- · Replies 4 ·
Undergrad Merely a thought of where the universe expands into
- Dominion
- · Replies 2 ·
Undergrad Galaxy MoM-z14 - furthest observed object
- Astronuc
- · Replies 9 ·
High School Estimates — True Size of the Universe?
- Ascendant0
- · Replies 33 ·
Undergrad How our Moon and Sun may affect Earth's equatorial bulge
- lunatectonics
- · Replies 3 ·
Undergrad Luminous Fast Blue Optical Transients (LFBOTs)
- Astronuc
- · Replies 0 ·
Undergrad Before the Big Bang
- Jaime Rudas
- · Replies 31 ·
Undergrad Galactic collision and dark matter
- Skaperen
- · Replies 1 ·
High School Is it a meteor or a meteorite when it makes moonfall?
- DaveC426913
- · Replies 3 ·
High School Lunar Orbit Issues & Lunar Clocks
- Jaziel
- · Replies 4 ·
Undergrad Do existing EFE solutions support Closed Timelike Curves?
- cianfa72
- · Replies 7 ·
High School Is this a coincidence?... (distances between planets)
- Jan Naus
- · Replies 7 ·
High School NASA Data Site Down
- LightningInAJar
- · Replies 5 ·
High School Looking for info about the Sombrero Galaxy
- mayflowers
- · Replies 10 ·
Undergrad Could Venus be a 'Soot World'?
- Al_
- · Replies 14 ·
High School Gravitational effects of a small black hole passing your body
- fresh_42
- · Replies 1 ·
Undergrad The quintessence as variable dark energy
- Jaime Rudas
- · Replies 18 ·
Graduate Couldn't the cosmological constant also have some sort of "dynamics"?
- mad mathematician
- · Replies 4 ·
Undergrad Is there anything inside a black hole?
- Green dwarf
- · Replies 16 ·
High School Red shifted tired light doubts
- MikeG
- · Replies 10 ·
Undergrad Population 3 star (Pop III) candidate LAP1
- pinball1970
- · Replies 3 ·
Graduate Strong Progenitor Age Bias in Supernova Cosmology
- PeterDonis
- · Replies 30 ·
Rock on Mars possibly indicating Life
- BillTre
- · Replies 14 ·
High School If the Universe has a cause, what caused that cause?
- sahana
- · Replies 13 ·
High School Looking to get a better understanding of bubble universe formation
- Lynch101
- · Replies 3 ·
High School Is space stretching or is new space being created?
- revnice
- · Replies 47 ·
High School Star like object travels in a zigzagging pattern relative to other stars
- lbiskupec
- · Replies 49 ·
Undergrad Visible light Over Large Distances
- RobbyQ
- · Replies 4 ·
High School Rutgers finds a transparent Einstein Cross - apparently a dark matter "halo"
- .Scott
- · Replies 8 ·
Undergrad Questions about quantum cosmology
- kodama
- · Replies 8 ·