Astronomy and Astrophysics Forum

Post thread
Join in expert discussion on the topics of Astronomy and astrophysics. 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 ·
80
Replies
2K
Views
268K
  • Sticky
Stargazing How Can You Improve Your Amateur Solar Imaging Techniques?
  • · Replies 311 ·
11
Replies
311
Views
54K
  • Sticky
Insights Planning to buy a first telescope? - Comments
  • · Replies 161 ·
6
Replies
161
Views
136K
  • Sticky
Astronomy and Cosmology FAQ List
  • · Replies 3 ·
Replies
3
Views
15K
Undergrad How our Moon and Sun may affect Earth's equatorial bulge
  • · Replies 3 ·
Replies
3
Views
304
Undergrad Practical cosmic speed limit for macroscopic objects?
  • · Replies 4 ·
Replies
4
Views
297
Undergrad Luminous Fast Blue Optical Transients (LFBOTs)
  • · Replies 0 ·
Replies
0
Views
184
Undergrad Question of accuracy of galactic collision simulations
  • · Replies 10 ·
Replies
10
Views
1K
High School Is it a meteor or a meteorite when it makes moonfall?
  • · Replies 3 ·
Replies
3
Views
350
Undergrad Rotation curve in spiral galaxy velocity and uniform velocity dispersion
  • · Replies 1 ·
Replies
1
Views
673
High School Lunar Orbit Issues & Lunar Clocks
  • · Replies 4 ·
Replies
4
Views
521
Stargazing Solar Activity and Space Weather Update thread
  • · Replies 444 ·
15
Replies
444
Views
56K
High School NASA Data Site Down
  • · Replies 5 ·
Replies
5
Views
730
High School Looking for info about the Sombrero Galaxy
  • · Replies 10 ·
Replies
10
Views
863
Undergrad Could Venus be a 'Soot World'?
  • · Replies 14 ·
Replies
14
Views
991
Undergrad Is there anything inside a black hole?
  • · Replies 16 ·
Replies
16
Views
2K
The James Webb Space Telescope
  • · Replies 537 ·
18
Replies
537
Views
55K
High School 3I/ATLAS, Interstellar Comet
  • · Replies 21 ·
Replies
21
Views
5K
Undergrad Population 3 star (Pop III) candidate LAP1
  • · Replies 3 ·
Replies
3
Views
815
Rock on Mars possibly indicating Life
  • · Replies 14 ·
Replies
14
Views
5K
High School Help with the protocol for accurately recording an orbit for the IAU
  • · Replies 0 ·
Replies
0
Views
671
Graduate Project Progress Report and possible Radio Astronomy Technique?
  • · Replies 8 ·
Replies
8
Views
948
High School Star like object travels in a zigzagging pattern relative to other stars
  • · Replies 49 ·
2
Replies
49
Views
9K
Undergrad Visible light Over Large Distances
  • · Replies 4 ·
Replies
4
Views
631
Undergrad How feasible is home radio astronomy?
  • · Replies 93 ·
4
Replies
93
Views
12K
Stargazing Castor, Pollux, Mars and the Moon
  • · Replies 1 ·
Replies
1
Views
2K
Stargazing Partial Solar Eclipse, From Southern New Zealand
  • · Replies 1 ·
Replies
1
Views
629
High School Asteroid 2024 YR4 has a 1% risk of a multi-megaton impact in 2032 (now ruled out)
  • · Replies 35 ·
2
Replies
35
Views
7K
High School Venus and Jupiter Conjunction
  • · Replies 4 ·
Replies
4
Views
805
Undergrad Potential biosignature found in Mars rock
  • · Replies 13 ·
Replies
13
Views
865
Does it make sense to build new radio telescopes?
  • · Replies 46 ·
2
Replies
46
Views
2K
Graduate Could gamma-ray bursts have an intragalactic origin?
  • · Replies 29 ·
Replies
29
Views
930
Stargazing Orange lines on Aladin lite
  • · Replies 3 ·
Replies
3
Views
582
Graduate Why do both poles of a radio pulsar emit radio waves?
  • · Replies 7 ·
Replies
7
Views
640
Undergrad Could fast radio bursts be alien radar signals?
  • · Replies 9 ·
Replies
9
Views
711
High School Looking for a list of astronomy collaborations
  • · Replies 2 ·
Replies
2
Views
2K
High School Does Time Pass at Different Rates on Other Planets?
  • · Replies 19 ·
Replies
19
Views
965
Graduate Self-gravitating systems and MOND
  • · Replies 11 ·
Replies
11
Views
722
Undergrad How to explain the strange pulsar in the Crab Nebula?
  • · Replies 4 ·
Replies
4
Views
738
Undergrad Why are continuously emitting radio pulsars not detected?
  • · Replies 30 ·
2
Replies
30
Views
1K
Undergrad Time interval terminology
  • · Replies 6 ·
Replies
6
Views
704
Graduate Charge to mass ratio of a photon
  • · Replies 15 ·
Replies
15
Views
2K
High School Simulating the Universe's First Stars - The Population III Stars
  • · Replies 5 ·
Replies
5
Views
653
High School Feasibility of Sending a Radio Signal Detectable from a Neighboring Star
  • · Replies 5 ·
Replies
5
Views
665
High School How Can Interstellar Asteroids Be Analyzed Using Orbital Mechanics Equations?
  • · Replies 22 ·
Replies
22
Views
972
Undergrad How Does the Balloon Analogy Explain the Expansion of the Universe?
  • · Replies 5 ·
Replies
5
Views
830
Undergrad Sun gravitational lensing forces
  • · Replies 11 ·
Replies
11
Views
2K
High School Where can I find easy-to-understand GAIA exoplanet data?
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Large Synoptic Survey Telescope -> Vera C. Rubin Observatory
  • · Replies 13 ·
Replies
13
Views
5K
High School Sun's peak wavelengths and chlorophyll's green colour
  • · Replies 27 ·
Replies
27
Views
3K
Graduate Understanding the Gravitational Redshift Caused by a Black Hole
  • · Replies 9 ·
Replies
9
Views
1K
High School How well do we understand the formation of population III stars?
  • · Replies 7 ·
Replies
7
Views
3K
Undergrad Questions on Expansion of the Universe and Newtonian Physics
  • · Replies 7 ·
Replies
7
Views
2K
High School Strange spiral structure in Oort Cloud, outer Solar System
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad How 'Messy' are Fusion Reaction Chains in Stars?
  • · Replies 6 ·
Replies
6
Views
4K
High School Strongest hints yet of biological activity outside the solar system
  • · Replies 21 ·
Replies
21
Views
3K
Undergrad Help with my Polar Aligning Star Tracker please
  • · Replies 18 ·
Replies
18
Views
3K
Undergrad IRAF 2025?
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad If We Crack the Neutron Star Equation of State, How Will It Change Our Daily Lives?
  • · Replies 12 ·
Replies
12
Views
3K
High School Colliding Gas Cloud to form a Star
  • · Replies 3 ·
Replies
3
Views
1K
Undergrad Gravitational wave effects on different materials
  • · Replies 4 ·
Replies
4
Views
1K
How Can I Enhance My Deep Sky Images and Identify Celestial Objects?
  • · Replies 8 ·
Replies
8
Views
2K
High School What has space exploration done for me as an individual?
  • · Replies 16 ·
Replies
16
Views
2K
Stargazing Small angle lunar haloes
  • · Replies 5 ·
Replies
5
Views
2K
Graduate Did scientists just find that the Universe has finite angular momentum?
  • · Replies 12 ·
Replies
12
Views
3K
High School Confusion regarding black hole spin
  • · Replies 40 ·
2
Replies
40
Views
4K
Undergrad Mass Loss on an HR diagram
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Magnitude where the Pale Dot is blue?
  • · Replies 1 ·
Replies
1
Views
1K
Graduate Classifying Milky Way planets by what they´re bound to and originate from
  • · Replies 3 ·
Replies
3
Views
1K
Undergrad Galaxy GNZ11 33 billion light-years away
  • · Replies 7 ·
Replies
7
Views
2K
High School First ever recorded planetary engulfment
  • · Replies 3 ·
Replies
3
Views
3K
High School Does Sun cross planes of all binary stars?
  • · Replies 14 ·
Replies
14
Views
2K
Stargazing Q: Meridian flip
  • · Replies 6 ·
Replies
6
Views
2K
High School What is dark matter?
  • · Replies 10 ·
Replies
10
Views
3K
High School Is the Gaia Telescope's Shutdown Impacting Our Ability to Map the Milky Way?
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Why Do Nebulae only have Hydrogen, Oxygen and Sulfur?
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Confused about Stonyhurst Grid and jHelioViewer
  • · Replies 17 ·
Replies
17
Views
3K
Undergrad How can the Universe be infinite?
  • · Replies 6 ·
Replies
6
Views
3K
Undergrad Speediest Exoplanet System
  • · Replies 11 ·
Replies
11
Views
4K
High School How Can Black Holes Vary in Size if They Are Singularities?
  • · Replies 20 ·
Replies
20
Views
3K
High School CNO Cycle
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Can Staging Rockets Achieve Faster-Than-Light Travel Despite Relativity?
  • · Replies 8 ·
Replies
8
Views
2K
Measuring the Solar System and Universe
  • · Replies 2 ·
Replies
2
Views
2K
High School Possible explanations for meteor like observations?
  • · Replies 12 ·
Replies
12
Views
3K
Undergrad The initial density of an object and its compression into a black hole
  • · Replies 17 ·
Replies
17
Views
5K
High School I Need Help on Understanding Some Basic Astrophysics / Sand Clock Universe
  • · Replies 5 ·
Replies
5
Views
3K
Undergrad Would discovery of a galaxy without dark matter disprove MOND?
  • · Replies 13 ·
Replies
13
Views
4K
Undergrad Cosmic ray origins
  • · Replies 1 ·
Replies
1
Views
2K
Stargazing Is There a New Planet Beyond Neptune?
  • · Replies 1 ·
Replies
1
Views
2K
Stargazing Merger of two black holes (video)
  • · Replies 7 ·
Replies
7
Views
4K
High School Brightness of different layers of the Sun
  • · Replies 29 ·
Replies
29
Views
3K
Graduate Understanding NOAA and Naval Observatory's Solar Calculations
  • · Replies 16 ·
Replies
16
Views
7K
High School Atmospheric refraction and "rainbow"
  • · Replies 27 ·
Replies
27
Views
3K
Undergrad How big a lunar radio telescope to detect Earth-like signals?
  • · Replies 19 ·
Replies
19
Views
3K
High School Question: Orbital mechanics of a binary star system
  • · Replies 5 ·
Replies
5
Views
2K
Stargazing Meteorite crash recorded on video in Canada
  • · Replies 10 ·
Replies
10
Views
2K
High School More scope refurbishments or start new?
  • · Replies 7 ·
Replies
7
Views
2K
Stargazing How Did You Capture the Mars Occultation? Share Your Photos Here!
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Nature paper on Moon's initial evolution - Tidally driven remelting
  • · Replies 1 ·
Replies
1
Views
3K
Undergrad The Heavier Elements: A Question About Their Abundance
  • · Replies 28 ·
Replies
28
Views
4K
Undergrad Moon phase ruins my Stargazing!
  • · Replies 6 ·
Replies
6
Views
2K
High School Help w/ repairing/refurbishing an equatorial mount
  • · Replies 11 ·
Replies
11
Views
3K
High School Does my theory about black holes make sense ?
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Expansion of a star to become a red giant
  • · Replies 16 ·
Replies
16
Views
4K