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.
High School What’s more “important": GR or QM?
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad What Justifies the Slight Preponderance of Matter Over Anti-Matter?
  • · Replies 25 ·
Replies
25
Views
4K
Stargazing Does Our Picture of the Universe Become Less Accurate the Farther We Look?
  • · Replies 4 ·
Replies
4
Views
4K
Undergrad How is dark matter thought to have formed a network scaffolding?
  • · Replies 40 ·
2
Replies
40
Views
7K
High School Defining Planets: The Case of Pluto and Other Small Bodies
  • · Replies 27 ·
Replies
27
Views
7K
Undergrad Does the universe have a definite "size"?
  • · Replies 5 ·
Replies
5
Views
2K
High School Expansion or contraction -- how do we know which?
  • · Replies 24 ·
Replies
24
Views
3K
Undergrad BREAKING: New potentially habitable exoplanet found around Teegarden
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Equation of state and density parameter
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad Cosmological constant and structure formation
  • · Replies 3 ·
Replies
3
Views
2K
High School How well should Astronomers know General Relativity?
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Spacetime curvature and curvature index
  • · Replies 7 ·
Replies
7
Views
2K
High School What is Hubble's Luminosity Law?
  • · Replies 2 ·
Replies
2
Views
3K
Undergrad Creation of our universe from zero energy?
  • · Replies 8 ·
Replies
8
Views
2K
Graduate 2-body inspirals that circularize
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad What's the largest rocky planet with 1g gravity in theory?
  • · Replies 15 ·
Replies
15
Views
5K
High School The Hubble deep field photos and the edge of the universe
  • · Replies 17 ·
Replies
17
Views
3K
High School Black holes and the first law of thermodynamics
  • · Replies 10 ·
Replies
10
Views
3K
High School What is the probability that the Universe is absolutely flat?
  • · Replies 96 ·
4
Replies
96
Views
15K
Undergrad Coherence length of velocity fields
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Most-detailed-ever simulations of a BH solve long standing mystery
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Dark Matter not present in Galaxy when distance is Increased
  • · Replies 3 ·
Replies
3
Views
2K
High School Galaxy Database with distances from Earth
  • · Replies 12 ·
Replies
12
Views
3K
Undergrad Hubble's Law: Distance, Speed, & Upper Limit
  • · Replies 1 ·
Replies
1
Views
1K
Graduate Can anything capture a black hole?
  • · Replies 1 ·
Replies
1
Views
3K
Graduate Cosmological models with variable EoS
  • · Replies 2 ·
Replies
2
Views
2K
High School Is Dark Energy Born at the Big Bang or Continually Created?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Did Universal Physical Constants Exist at the Big Bang?
  • · Replies 2 ·
Replies
2
Views
2K
High School Is the asteroid belt horizontal or like a dome?
  • · Replies 7 ·
Replies
7
Views
3K
Undergrad Can Merging Black Holes Have Infinite Kinetic Energy?
  • · Replies 35 ·
2
Replies
35
Views
5K
Undergrad Qs re Cosmological Models Using Bayesian Probability Methods
  • · Replies 1 ·
Replies
1
Views
2K
High School Is Dark Matter a Misunderstood Global Effect?
  • · Replies 13 ·
Replies
13
Views
4K
High School Destroying asteroids shown to be very difficult
  • · Replies 50 ·
2
Replies
50
Views
9K
High School Age of Universe: 13.8 Billion Years
  • · Replies 7 ·
Replies
7
Views
3K
Undergrad The Sun's excess gamma rays and strange dips
  • · Replies 1 ·
Replies
1
Views
2K
Playing with the Universe Sandbox Software
  • · Replies 1 ·
Replies
1
Views
2K
Graduate What is the shape of the universe?
  • · Replies 5 ·
Replies
5
Views
4K
Undergrad Is the Universe a 3-sphere or a 4-sphere?
  • · Replies 42 ·
2
Replies
42
Views
8K
High School Radio source Hercules A and galaxy 3C 348
  • · Replies 4 ·
Replies
4
Views
3K
High School New theory, our solar system formation, "space bubble"
  • · Replies 16 ·
Replies
16
Views
4K
High School What is empirically known about the shape and size of the Universe?
  • · Replies 34 ·
2
Replies
34
Views
7K
What should we do with the retired Hubble?
  • · Replies 18 ·
Replies
18
Views
6K
High School Juno -- Coolest space ship in the solar system?
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Please teach me about the mass of Sgr A*
  • · Replies 13 ·
Replies
13
Views
3K
Stargazing How Did Ancient People Calculate Celestial Measurements?
  • · Replies 7 ·
Replies
7
Views
3K
Graduate Dark matter and energy explained by negative mass
  • · Replies 131 ·
5
Replies
131
Views
18K
Undergrad What Innovative Coding Projects Can Enhance Your Understanding of Cosmology?
  • · Replies 2 ·
Replies
2
Views
2K
High School A little logical doubt on Hawking radiation
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Terraforming Mars by using Europa
  • · Replies 57 ·
2
Replies
57
Views
13K
Undergrad What physical mechanisms are involved in heating planetary bodies?
  • · Replies 5 ·
Replies
5
Views
1K
Undergrad Why Does Wormhole Travel Take Longer Than a 'Regular' Path?
  • · Replies 7 ·
Replies
7
Views
3K
Undergrad Questions about the inverse square law
  • · Replies 3 ·
Replies
3
Views
3K
Undergrad Mars Magnetosphere: New Research on Solar Wind Induced Shielding
  • · Replies 14 ·
Replies
14
Views
3K
Graduate Direct Detection of Cold Dark Matter
  • · Replies 2 ·
Replies
2
Views
3K
High School Could Matter/Anti-Matter Annihilation Explain Dark Energy and Dark Matter?
  • · Replies 7 ·
Replies
7
Views
3K
High School Is the Hawking-Hartle Euclidean approach confirmed by CMBR data?
  • · Replies 13 ·
Replies
13
Views
3K
Undergrad What Future Experiments Could Confirm Extra Dimensions in Cosmology?
  • · Replies 15 ·
Replies
15
Views
3K
High School Is 3D reality merely an illusion?
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad How Does Baryonic Matter Alone Affect the Universe’s Structure?
  • · Replies 10 ·
Replies
10
Views
2K
High School Is the "Information Paradox" close to getting resolved?
  • · Replies 30 ·
2
Replies
30
Views
4K
High School What Size Would the Universe Be if Compressed to Neutron Star Density?
  • · Replies 11 ·
Replies
11
Views
3K
Undergrad How best to photograph the Lyrid meteor shower
  • · Replies 3 ·
Replies
3
Views
3K
Undergrad Is the Floating Launch Loop a Viable Alternative for Space Exploration?
  • · Replies 1 ·
Replies
1
Views
2K
Excited to go to Brian Cox's "ADVENTURES IN SPACE & TIME" tonight
  • · Replies 9 ·
Replies
9
Views
2K
Undergrad Planets or stars that are composed entirely out from Dark Matter.
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Cosmic microwave background observations
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad What happens to spacetime during the expansion of the Universe?
  • · Replies 21 ·
Replies
21
Views
3K
Undergrad So astronomers really don't have an idea about density of asteroids?
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad What is the refractive index of the Universe?
  • · Replies 21 ·
Replies
21
Views
3K
Graduate Alignment of Quasar Polarizations 0507274
  • · Replies 2 ·
Replies
2
Views
3K
Undergrad How does the expansion of the Universe affect black holes?
  • · Replies 9 ·
Replies
9
Views
3K
Graduate How Can I Find Correction Factors for Tropical Years in Historical Data?
  • · Replies 2 ·
Replies
2
Views
3K
Graduate Analysis Paralysis: A Must-Read Paper on Cosmology Theory/Data
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Historical reprint/coverage papers requested
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Interesting video on infrared modifications to gravity
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Observational constraints on quarks in neutron stars
  • · Replies 1 ·
Replies
1
Views
2K
Graduate What is the connection between dark matter and ordinary baryonic matter?
  • · Replies 1 ·
Replies
1
Views
3K
Graduate How unitary cosmology solves the inflationary entropy problem
  • · Replies 1 ·
Replies
1
Views
3K
Graduate Explore Holographic Dark Energy: Edmund J. Copeland et al.
  • · Replies 1 ·
Replies
1
Views
4K
Graduate Black hole accretion disk/jet reference
  • · Replies 1 ·
Replies
1
Views
3K
Graduate Lyman alpha forest different for different objects?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Black Hole Confusion: How Karen Masters Contributed
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Galactic Evolution: Recent Papers Reveal Important Insights
  • · Replies 1 ·
Replies
1
Views
3K
Graduate Escape Velocity in GR - PhysicsForums
  • · Replies 1 ·
Replies
1
Views
3K
Graduate Does the Thermoelectric effect apply in sun?
  • · Replies 1 ·
Replies
1
Views
3K
Graduate Centripetal forces and gravity
  • · Replies 1 ·
Replies
1
Views
3K
Graduate What Caused the Ejection of Mu Columbae and AE Aurigae from Orion?
  • · Replies 1 ·
Replies
1
Views
4K
Graduate Spiral Galaxies: Axes Alignment with Cosmic Voids
  • · Replies 1 ·
Replies
1
Views
4K
Undergrad Why is this Hubble plot linear for Omega=2 closed universe?
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad What will eventually happen to all EM waves / photons?
  • · Replies 10 ·
Replies
10
Views
3K
High School Wow. Great picture of exoplanet HR8799e - 129Ly distant
  • · Replies 10 ·
Replies
10
Views
3K
Graduate How does the electromagnetic force influence a galaxy (if at all)?
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Some comments on the 2019 Planetary Defense Conference
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Saturn's hexagon and his accretion disk jets
  • · Replies 1 ·
Replies
1
Views
4K
Undergrad Fitting a SiII curve in a supernova spectra
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Are MOND Equations Consistent Across Sources?
  • · Replies 7 ·
Replies
7
Views
2K
High School What Causes Meteor Showers and How Can You See Them?
  • · Replies 1 ·
Replies
1
Views
4K
High School Can a Stronger Black Hole Turn a Weaker One into a White Hole?
  • · Replies 14 ·
Replies
14
Views
3K
Undergrad For astronomers, what software/languages do you use to handle data?
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Dark Matter Real: Studies Confirm, Modifying Gravity Can't Work
  • · Replies 156 ·
6
Replies
156
Views
25K