Astronomy, Astrophysics, Cosmology Forum

Post thread
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.
  • Sticky
Our Beautiful Universe - Photos and Videos
  • · Replies 2K ·
82
Replies
2K
Views
294K
  • Sticky
Stargazing How Can You Improve Your Amateur Solar Imaging Techniques?
  • · Replies 311 ·
11
Replies
311
Views
59K
  • Sticky
Insights Planning to buy a first telescope? - Comments
  • · Replies 161 ·
6
Replies
161
Views
141K
  • Sticky
Insights Intro to Big Bang and Infinity Concepts - Comments
  • · Replies 62 ·
3
Replies
62
Views
22K
  • Sticky
Insights Equations of State for Photon Gas and Relativistic Electron Gas
  • · Replies 0 ·
Replies
0
Views
7K
  • Sticky
Insights A Journey Into the Cosmos - FLRW Metric and The Friedmann Equation - Comments
  • · Replies 0 ·
Replies
0
Views
8K
  • Sticky
Graduate Astronomy and Cosmology FAQ List
  • · Replies 3 ·
Replies
3
Views
17K
Stargazing Solar Activity and Space Weather Update thread
  • · Replies 464 ·
16
Replies
464
Views
68K
Undergrad Intelligent life and the Fermi Paradox
  • · Replies 2 ·
Replies
2
Views
380
High School Good drawing of Earth's orbit for model? Possibly vector file?
  • · Replies 36 ·
2
Replies
36
Views
3K
High School Will we ever communicate with extraterrestial life in a reasonable time frame?
  • · Replies 3 ·
Replies
3
Views
391
Undergrad "Scientists have measured space to be flat to high accuracy"
  • · Replies 8 ·
Replies
8
Views
2K
High School Spotting 1997 NC1 flyby on Fri/Sat
  • · Replies 2 ·
Replies
2
Views
403
High School 3I/ATLAS, Interstellar Comet
  • · Replies 22 ·
Replies
22
Views
8K
High School Help with the protocol for accurately recording an orbit for the IAU
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Hubble Constant, Dark Energy and the Expanding Universe
  • · Replies 22 ·
Replies
22
Views
7K
Undergrad Cosmological Redshift and Expansion
  • · Replies 51 ·
2
Replies
51
Views
5K
High School Dark energy might not be constant after all
  • · Replies 12 ·
Replies
12
Views
6K
High School Anyone come across this new YouTube channel?
  • · Replies 19 ·
Replies
19
Views
1K
High School Formation of gravastars
  • · Replies 9 ·
Replies
9
Views
2K
Graduate Could the Foucault precession be an incomplete forcing?
  • · Replies 2 ·
Replies
2
Views
820
High School Long rod in orbit
  • · Replies 14 ·
Replies
14
Views
2K
High School The One Electron Universe suggested by Wheeler
  • · Replies 10 ·
Replies
10
Views
3K
High School A question on the geometry of black holes
  • · Replies 57 ·
2
Replies
57
Views
4K
High School Near-Earth Object/Asteroid 2026 JH2
  • · Replies 2 ·
Replies
2
Views
1K
The Universe’s Brightest Explosions Were Discovered by Accident
  • · Replies 2 ·
Replies
2
Views
2K
High School Can a black hole become a white hole?
  • · Replies 7 ·
Replies
7
Views
2K
High School GRB 250702B, the longest gamma-ray burst in history
  • · Replies 6 ·
Replies
6
Views
3K
High School Could the interstellar medium distort alien signals?
  • · Replies 2 ·
Replies
2
Views
1K
Stargazing TRAPPIST-1 system
  • · Replies 1 ·
Replies
1
Views
945
Undergrad Practical cosmic speed limit for macroscopic objects?
  • · Replies 15 ·
Replies
15
Views
5K
Undergrad Are Alternative Dark Energy Models Treated More Favorably Than MOND?
  • · Replies 13 ·
Replies
13
Views
3K
Undergrad Dumb Dumb has a question (standard candles)
  • · Replies 3 ·
Replies
3
Views
1K
Undergrad Ice on the moon
  • · Replies 10 ·
Replies
10
Views
2K
Undergrad Does Spacetime rotate like a vortex?
  • · Replies 6 ·
Replies
6
Views
1K
High School Theory on universe expansion
  • · Replies 4 ·
Replies
4
Views
1K
Undergrad Help Understanding the Hubble Constant's Units
  • · Replies 22 ·
Replies
22
Views
3K
High School Deflection of Light by the Sun
  • · Replies 3 ·
Replies
3
Views
848
Stargazing Astronomy: Orbit Terminology
  • · Replies 41 ·
2
Replies
41
Views
5K
High School Size of the early universe as we see now
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad Live data from Artemis 2?
  • · Replies 6 ·
Replies
6
Views
1K
Undergrad Is our definition of 'cosmic voids' misleading the H₀ discussion?
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Large Synoptic Survey Telescope -> Vera C. Rubin Observatory
  • · Replies 15 ·
Replies
15
Views
7K
The James Webb Space Telescope
  • · Replies 544 ·
19
Replies
544
Views
64K
High School Infinite universe, infinite volume from the beginning?
  • · Replies 22 ·
Replies
22
Views
3K
Stargazing Meteor/meteorite made a big boom this morning!
  • · Replies 19 ·
Replies
19
Views
3K
High School ASASSN-15lh (aka SN 2015L), a superluminal supernova, or hypernova?
  • · Replies 9 ·
Replies
9
Views
2K
High School Uracil found in carbonaceous asteroid
  • · Replies 10 ·
Replies
10
Views
3K
High School Independent Inflationary Regions in an Infinite Universe?
  • · Replies 28 ·
Replies
28
Views
2K
Graduate Why are the bulge particles coming out in the Gadget 2 simulation?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Age of the Universe and the Cosmological Constant
  • · Replies 18 ·
Replies
18
Views
4K
Undergrad A paper regarding the Hubble tension using Gaia data
  • · Replies 3 ·
Replies
3
Views
1K
Undergrad What part of Mars Rover or Mars satellite has this cone object fallen from?
  • · Replies 10 ·
Replies
10
Views
2K
Undergrad M31-2014-DS1, slow disappearance of a massive star
  • · Replies 1 ·
Replies
1
Views
3K
High School A Mind-Boggling Number Comparison
  • · Replies 54 ·
2
Replies
54
Views
6K
Undergrad Abundant water from primordial supernovae at cosmic dawn
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Exoplanet, HD 137010 b and it's star, HD 137010
  • · Replies 0 ·
Replies
0
Views
2K
Undergrad Question of accuracy of galactic collision simulations
  • · Replies 11 ·
Replies
11
Views
3K
Graduate Project Progress Report and possible Radio Astronomy Technique?
  • · Replies 9 ·
Replies
9
Views
3K
High School What is space?
  • · Replies 13 ·
Replies
13
Views
4K
Undergrad Is Vacuum Decay from a False to True State Impossible or Just Unlikely?
  • · Replies 3 ·
Replies
3
Views
5K
Graduate Larson-Sekanina Rotational Gradient Filter for comet 3i/Atlas
  • · Replies 0 ·
Replies
0
Views
2K
Undergrad Milne vs. Minkowski metric
  • · Replies 30 ·
2
Replies
30
Views
16K
Undergrad Comparing different scale factor functions in the same graph
  • · Replies 6 ·
Replies
6
Views
14K
Undergrad Does the scale factor need to be normalized?
  • · Replies 93 ·
4
Replies
93
Views
8K
Undergrad Blueshift in case of the Big Crunch scenario
  • · Replies 9 ·
Replies
9
Views
2K
Undergrad Are Boltzmann brains predicted by our current cosmological theories?
  • · Replies 12 ·
Replies
12
Views
3K
Undergrad Unexpected findings in need of an explanation (retrograde motion of Mars)
  • · Replies 83 ·
3
Replies
83
Views
8K
Undergrad Rotation curve in spiral galaxy velocity and uniform velocity dispersion
  • · Replies 4 ·
Replies
4
Views
3K
High School Contradictions in the Distribution of Gamma-Ray Bursts
  • · Replies 24 ·
Replies
24
Views
4K
High School Expansion and raisin bread
  • · Replies 5 ·
Replies
5
Views
2K
High School Questions about the structure of dark matter
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Merely a thought of where the universe expands into
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Galaxy MoM-z14 - furthest observed object
  • · Replies 9 ·
Replies
9
Views
3K
High School Estimates — True Size of the Universe?
  • · Replies 33 ·
2
Replies
33
Views
10K
Undergrad How our Moon and Sun may affect Earth's equatorial bulge
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Luminous Fast Blue Optical Transients (LFBOTs)
  • · Replies 0 ·
Replies
0
Views
2K
Undergrad Before the Big Bang
  • · Replies 31 ·
2
Replies
31
Views
5K
Undergrad Galactic collision and dark matter
  • · Replies 1 ·
Replies
1
Views
1K
High School Is it a meteor or a meteorite when it makes moonfall?
  • · Replies 3 ·
Replies
3
Views
2K
High School Lunar Orbit Issues & Lunar Clocks
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Do existing EFE solutions support Closed Timelike Curves?
  • · Replies 7 ·
Replies
7
Views
2K
High School Is this a coincidence?... (distances between planets)
  • · Replies 7 ·
Replies
7
Views
3K
High School NASA Data Site Down
  • · Replies 5 ·
Replies
5
Views
2K
High School Looking for info about the Sombrero Galaxy
  • · Replies 10 ·
Replies
10
Views
2K
Undergrad Could Venus be a 'Soot World'?
  • · Replies 14 ·
Replies
14
Views
3K
High School Gravitational effects of a small black hole passing your body
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad The quintessence as variable dark energy
  • · Replies 18 ·
Replies
18
Views
4K
Graduate Couldn't the cosmological constant also have some sort of "dynamics"?
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Is there anything inside a black hole?
  • · Replies 16 ·
Replies
16
Views
4K
High School Red shifted tired light doubts
  • · Replies 10 ·
Replies
10
Views
3K
Undergrad Population 3 star (Pop III) candidate LAP1
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Strong Progenitor Age Bias in Supernova Cosmology
  • · Replies 30 ·
2
Replies
30
Views
9K
Rock on Mars possibly indicating Life
  • · Replies 14 ·
Replies
14
Views
6K
High School If the Universe has a cause, what caused that cause?
  • · Replies 13 ·
Replies
13
Views
4K
High School Looking to get a better understanding of bubble universe formation
  • · Replies 3 ·
Replies
3
Views
2K
High School Is space stretching or is new space being created?
  • · Replies 47 ·
2
Replies
47
Views
7K
High School Star like object travels in a zigzagging pattern relative to other stars
  • · Replies 49 ·
2
Replies
49
Views
15K
Undergrad Visible light Over Large Distances
  • · Replies 4 ·
Replies
4
Views
2K
High School Rutgers finds a transparent Einstein Cross - apparently a dark matter "halo"
  • · Replies 8 ·
Replies
8
Views
2K
Undergrad Questions about quantum cosmology
  • · Replies 8 ·
Replies
8
Views
2K
Undergrad Where did the early photons go?
  • · Replies 34 ·
2
Replies
34
Views
4K
High School Can big bang be a part of a loop?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad How feasible is home radio astronomy?
  • · Replies 93 ·
4
Replies
93
Views
16K
Undergrad Are primordial fluctuations the source of all structure?
  • · Replies 5 ·
Replies
5
Views
2K
High School What happens to information inside a black hole?
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Illuminating Black Hole Shadows with Dark Matter Annihilation
  • · Replies 5 ·
Replies
5
Views
2K