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.
Graduate What does the TE CMB spectrum reveal?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad What Can We Learn About Stellar Nucleosynthesis at the NIC-XVII Symposium?
  • · Replies 0 ·
Replies
0
Views
2K
High School What is the significance of the record-breaking Gamma-Ray Burst GRB221009A?
  • · Replies 12 ·
Replies
12
Views
3K
High School Where did the first universe come from?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad How to Independently Determine the Proportion of Dark Energy Density?
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Maximizing S/N in Angular Power Spectrum Signals
  • · Replies 3 ·
Replies
3
Views
2K
Stargazing U.S. Solar Eclipse of Aug. 21, 2017
  • · Replies 414 ·
14
Replies
414
Views
61K
Undergrad Are there non-smooth metrics for spacetime (without singularities)?
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Phase Contrast Telescope - Part II
  • · Replies 25 ·
Replies
25
Views
3K
Undergrad Gravity does negative or positive work with cosmos redshift?
  • · Replies 7 ·
Replies
7
Views
4K
Stargazing Is Plutonium Found in Space Naturally?
  • · Replies 36 ·
2
Replies
36
Views
6K
High School Did Georges Lemaître Think the Universe Began from a Point?
  • · Replies 16 ·
Replies
16
Views
4K
Undergrad Approximate local flatness = Approximate local symmetries?
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Angle of Sun by date and zip code?
  • · Replies 6 ·
Replies
6
Views
3K
Undergrad Oort Cloud and Kuiper Belt: differences
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Solutions that break the Lorentz invariance...?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad When did the consensus on the maximum recession speed in cosmology change?
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad Oort Cloud Dynamics: Interaction, Composition, Hazards
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad How Long Does Water Ice Take to Sublimate in Space?
  • · Replies 7 ·
Replies
7
Views
4K
Undergrad Can a scalar field model account for the cosmic redshift?
  • · Replies 20 ·
Replies
20
Views
3K
Graduate N-Body Simulations of Chaos in the Orbits of Trappist System Planets
  • · Replies 12 ·
Replies
12
Views
3K
High School Map of M87 Galaxy & Universe: Find & Explore Here!
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Inhomogeneities and topological defects in cosmology...
  • · Replies 2 ·
Replies
2
Views
2K
High School 'Universe Breaking' results from JWST -- What does this mean?
  • · Replies 36 ·
2
Replies
36
Views
5K
Graduate Interpreting SDSS extragalactic data in the era of JWST
  • · Replies 1 ·
Replies
1
Views
2K
High School Deriving the Approach Velocity of Meteorites
  • · Replies 6 ·
Replies
6
Views
4K
Undergrad Research paper and sources investigating Earth's moons
  • · Replies 15 ·
Replies
15
Views
2K
Undergrad Do Emission and Absorption Spectra Match? A Non-Physics Minded Tourist's Guide
  • · Replies 4 ·
Replies
4
Views
2K
High School Forming Stars/ Brown Dwarfs by photo-erosion
  • · Replies 2 ·
Replies
2
Views
2K
High School Expansion of space affecting photon's energy
  • · Replies 11 ·
Replies
11
Views
4K
Graduate Stephen Hawking's doctoral thesis is available online
  • · Replies 4 ·
Replies
4
Views
3K
Undergrad Estimating Mass of Central Object Using S2's Orbit Motion and Kepler's 3rd Law
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Density parameter and curvature index
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad What Milky Way stars could go supernova to < +3 at any time?
  • · Replies 3 ·
Replies
3
Views
2K
High School Why is this JWST paper a cause for 'Panic'?
  • · Replies 16 ·
Replies
16
Views
5K
Undergrad What does it mean that symmetries do not hold globally?
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Massive galaxies during the early Universe, new JWST data
  • · Replies 1 ·
Replies
1
Views
2K
High School Can a T-tauri star degenerate into a Brown dwarf?
  • · Replies 20 ·
Replies
20
Views
3K
High School Formation of Brown Dwarfs in filaments?
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Is there a difference between an ultracool dwarf and a brown dwarf？
  • · Replies 5 ·
Replies
5
Views
2K
NASA confirms half-ton meteor crashed in South Texas
  • · Replies 18 ·
Replies
18
Views
2K
High School Who was the first person to recognize the stars as very distant suns?
  • · Replies 12 ·
Replies
12
Views
4K
Graduate Does the invariable plane of the Solar system have axial precession?
  • · Replies 15 ·
Replies
15
Views
3K
Graduate Data on galaxy rotation curves vs visible matter
  • · Replies 3 ·
Replies
3
Views
3K
High School Mass of Space (B but approaching I)
  • · Replies 50 ·
2
Replies
50
Views
5K
Undergrad Could Dark Matter Be Stray Exoplanets or Collapsed Stars?
  • · Replies 14 ·
Replies
14
Views
3K
Undergrad Expansion of the Universe and the cosmological principle
  • · Replies 9 ·
Replies
9
Views
3K
High School What is the best source for this star data? (M44 Beehive Cluster)
  • · Replies 11 ·
Replies
11
Views
2K
High School Hot white dwarfs and pre-white dwarfs discovered with SALT, MNRAS
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Microwave background radiation - temperature at recombination
  • · Replies 3 ·
Replies
3
Views
3K
High School What is the “Unknown physics” of the new Kilonovae explosion?
  • · Replies 17 ·
Replies
17
Views
2K
Undergrad Some reasoning about Alfvén’s frozen-in flux theorem
  • · Replies 18 ·
Replies
18
Views
3K
High School How Can Planetary Movements Affect Time and Illumination on an Inhabited Planet?
  • · Replies 45 ·
2
Replies
45
Views
7K
Stargazing The Happy Fall Day for Meteorites
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad What is the basic definition and application of the virial theorem?
  • · Replies 2 ·
Replies
2
Views
3K
Graduate Schwarzschild radius of the Universe
  • · Replies 30 ·
2
Replies
30
Views
5K
Undergrad Cosmic Microwave Background Surveys
  • · Replies 3 ·
Replies
3
Views
1K
High School Is There a Standard Definition for One Light Year Distance?
  • · Replies 21 ·
Replies
21
Views
3K
High School Planetary Orbits - Elliptical or Wavelike?
  • · Replies 10 ·
Replies
10
Views
2K
Graduate Please help solve the equation in black hole f(R) theories
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Electron-Positron Pair Instability Supernova
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Black holes: merged remnants have similar spin - why?
  • · Replies 9 ·
Replies
9
Views
3K
High School The green comet is just a weak smudge now
  • · Replies 4 ·
Replies
4
Views
2K
High School How Do Gamma Ray Bursts Compare to Man-Made Plasma Emissions?
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad What Causes the High Tide on the Antipodal Side of the Earth?
  • · Replies 7 ·
Replies
7
Views
6K
High School Are the stars of the constellations stationary?
  • · Replies 8 ·
Replies
8
Views
2K
Undergrad Understanding diagrams of the late stages of stellar evolution
  • · Replies 1 ·
Replies
1
Views
3K
High School Question regarding supermassive black holes in the early Universe
  • · Replies 1 ·
Replies
1
Views
3K
High School Lost Companions: Investigating the Existence of the Nemesis Star
  • · Replies 6 ·
Replies
6
Views
3K
Undergrad Should I study astronomy first or cosmology first?
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad What is the difference between collisionless and self-interacting dark matter?
  • · Replies 1 ·
Replies
1
Views
2K
High School Is Your Rock a Real Meteorite or a Common Meteorwrong?
  • · Replies 9 ·
Replies
9
Views
5K
Undergrad Question on the horizon problem
  • · Replies 17 ·
Replies
17
Views
3K
Undergrad What is the probability of life on exopanet LHS475b?
  • · Replies 15 ·
Replies
15
Views
2K
High School Long String Theory: Unveiling the Universe's Secrets
  • · Replies 5 ·
Replies
5
Views
3K
Undergrad Expansion-Collapse cycle in cosmological structures?
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Local dark matter distribution
  • · Replies 14 ·
Replies
14
Views
2K
Graduate Has the merger of a neutron star and an anti-neutron star been modeled?
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Does the gravitational rate of acceleration increase within a planet?
  • · Replies 54 ·
2
Replies
54
Views
5K
High School Does Ceres ever transit Jupiter?
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Lunar Slingshot Maglev: NASA's Energy Savings for Mars & Beyond
  • · Replies 9 ·
Replies
9
Views
3K
Undergrad Comet Sublimation: Why Does Halley's Comet Still Exist?
  • · Replies 6 ·
Replies
6
Views
3K
Undergrad Can Electromagnets Propel Starship Orion Using Nuclear Explosions?
  • · Replies 17 ·
Replies
17
Views
2K
High School Data needed - Related bodies and their stats
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Successful predictions from anthropics? (History of science question)
  • · Replies 11 ·
Replies
11
Views
3K
High School Projected linear separation between companion stars
  • · Replies 14 ·
Replies
14
Views
3K
Undergrad Is it possible to unbind a neutron star?
  • · Replies 2 ·
Replies
2
Views
2K
Stargazing Can Stars Be Spaghettified in a Matter of Days by Black Holes?
  • · Replies 17 ·
Replies
17
Views
3K
Undergrad How much better is HabEx going to be relative to Webb?
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Measuring the rotation curve of galaxies
  • · Replies 1 ·
Replies
1
Views
2K
High School Does Roger Penrose's Big Bang cyclic-universe thing make sense?
  • · Replies 5 ·
Replies
5
Views
3K
High School Is there any kind of anti-matter "problem"?
  • · Replies 1 ·
Replies
1
Views
2K
High School Why so many want, or are not disturbed by, a "deterministic" universe?
  • · Replies 10 ·
Replies
10
Views
11K
Undergrad Hubble flow kinetic energy into other types of energy?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad How far away are stars in a typical star cluster from each other?
  • · Replies 12 ·
Replies
12
Views
3K
Graduate Presentation: Venus hot break hypothesis
  • · Replies 1 ·
Replies
1
Views
2K
High School Is there a theoretical size limit for a planet?
  • · Replies 39 ·
2
Replies
39
Views
7K
Undergrad What is the luminosity of Earendel?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Expression of Shot noise when expanding ##a_{\ell m}## coefficients
  • · Replies 2 ·
Replies
2
Views
2K
High School Is the Universe really infinite?
  • · Replies 11 ·
Replies
11
Views
5K