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 Do White Holes Violate 2nd Law of Thermodynamics?
  • · Replies 2 ·
Replies
2
Views
6K
Undergrad CMB Education Tool - Adjust Contrasts & Visualize Effects
  • · Replies 2 ·
Replies
2
Views
1K
High School Have we observed antimatter in the early universe?
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad How can the universe be infinitely big?
  • · Replies 5 ·
Replies
5
Views
2K
High School Could dark energy just be caused by virtual particles
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad What Are the Proposed Alternatives to the Multiverse Theory?
  • · Replies 17 ·
Replies
17
Views
4K
Undergrad Calculating average density of the Universe
  • · Replies 2 ·
Replies
2
Views
3K
Undergrad The observable Universe and its shape
  • · Replies 68 ·
3
Replies
68
Views
7K
Graduate "Observation" of Black Hole Merger
  • · Replies 3 ·
Replies
3
Views
2K
High School How important is gravitational red/blueshift for stars?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Factor of how much linear size scale has changed
  • · Replies 2 ·
Replies
2
Views
2K
High School The Fate of Gaseous Planets: Can They Stay Stable Forever?
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Is There a Preferred Axis in Cosmology and What Could Be Its Origin?
  • · Replies 8 ·
Replies
8
Views
3K
Stargazing Facing difficulties with radio telescope measurements
  • · Replies 1 ·
Replies
1
Views
2K
High School What would happen if the Sun collided with a similar star?
  • · Replies 5 ·
Replies
5
Views
2K
High School Is Dark Energy Really Driving the Expansion of the Universe?
  • · Replies 13 ·
Replies
13
Views
2K
High School Geometries of the Universe: What are the Most Accepted Models?
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Could pulsar timing arrays see primordial gravity waves?
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad Deriving Equation of Motion for Quintessence Scalar Field?
  • · Replies 9 ·
Replies
9
Views
3K
Graduate Two Way Tidal Lock: Can Planets and Moons Sync?
  • · Replies 8 ·
Replies
8
Views
3K
High School The way the moon 'behaves', coincidence or 'something more'?
  • · Replies 13 ·
Replies
13
Views
3K
Stargazing Software to adjust exposure? webcam, astrophotography
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Gamma ray burst associated with LIGO GW event
  • · Replies 121 ·
5
Replies
121
Views
17K
Stargazing Double image in reflector telescope
  • · Replies 13 ·
Replies
13
Views
7K
Graduate Tension between local and CMB measurements of Hubble constant
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Explore Binary System Inspiral w/ 1.5 Solar Masses
  • · Replies 10 ·
Replies
10
Views
5K
Undergrad How Can We Visualize One Dimensional Strings in Space Time?
  • · Replies 21 ·
Replies
21
Views
3K
Graduate In LIGO’s pulse, how much comes from BH merging/ inspiraling
  • · Replies 16 ·
Replies
16
Views
3K
High School North & South Star: Polaris & Sirius
  • · Replies 6 ·
Replies
6
Views
4K
Undergrad Planet at barycenter of a binary system.
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad How would one know whether a star would be observable?
  • · Replies 1 ·
Replies
1
Views
2K
High School How does dark matter affect planetary motion?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Will a body ever escape in a 3 body problem?
  • · Replies 5 ·
Replies
5
Views
3K
Undergrad Will a Slow Decrease in Dark Energy Density Alter the Fate of the Universe?
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Axis of Evil": Power Asymmetry in the Universe
  • · Replies 1 ·
Replies
1
Views
2K
High School What is causing the accelerated expansion of the universe?
  • · Replies 6 ·
Replies
6
Views
2K
High School How Small Was the Big Bang Singularity When It First Exploded?
  • · Replies 5 ·
Replies
5
Views
7K
High School Does the Formation of Positive and Negative Mass Occur Throughout the Universe?
  • · Replies 4 ·
Replies
4
Views
1K
Undergrad Understanding dark energy problem
  • · Replies 4 ·
Replies
4
Views
2K
High School Why the Earth orbits around the Sun
  • · Replies 9 ·
Replies
9
Views
2K
High School Lowest/Highest mass of a star, star system
  • · Replies 11 ·
Replies
11
Views
4K
High School Unraveling the Mystery of Dark Matter: Is it a Different Type of Gravity?
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Why there are different size stars?
  • · Replies 6 ·
Replies
6
Views
2K
High School Questions about the lifespan of the Earth
  • · Replies 5 ·
Replies
5
Views
2K
High School How to calculate the distance between a Star and Zenith
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Black Hole Paper Outlining Process of Singularity Formation
  • · Replies 5 ·
Replies
5
Views
2K
Graduate Are there widespread misconceptions about degeneracy pressure?
  • · Replies 63 ·
3
Replies
63
Views
25K
Graduate Could an entropic force help explain size of the cosmological constant?
  • · Replies 18 ·
Replies
18
Views
3K
High School What are the limitations of the heuristic picture of Hawking radiation?
  • · Replies 28 ·
Replies
28
Views
4K
High School Can Living in Space Lead to Immortality Through Technology?
  • · Replies 9 ·
Replies
9
Views
2K
High School Does antimatter have positive or negative mass?
  • · Replies 3 ·
Replies
3
Views
2K
High School Can Cosmic Strings Align Black Holes?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad How Does Aerobraking Work for the ExoMars Orbiter?
  • · Replies 4 ·
Replies
4
Views
1K
High School Can we see individual stars in the Andromeda Galaxy?
  • · Replies 7 ·
Replies
7
Views
2K
High School How Does Stellar Parallax Measure Distance?
  • · Replies 29 ·
Replies
29
Views
6K
High School Is it possible for "nothing" to exist
  • · Replies 22 ·
Replies
22
Views
3K
Undergrad Can a Torus be Gravitationally Bound?
  • · Replies 3 ·
Replies
3
Views
1K
Undergrad Question about the cosmological constant
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Time Space Fabric: Malleability & Extension Explored
  • · Replies 2 ·
Replies
2
Views
1K
Insights A Brief on the Expansion of the Universe - Comments
  • · Replies 26 ·
Replies
26
Views
10K
High School Initial Impetus Needed for Curved SpaceTime?
  • · Replies 22 ·
Replies
22
Views
3K
Undergrad Gravitational Binding Energy of a Torus
  • · Replies 1 ·
Replies
1
Views
2K
High School The Falcon Landing: How Did They Do It?
  • · Replies 9 ·
Replies
9
Views
2K
High School Could Another Big Bang Happen in My Hand?
  • · Replies 11 ·
Replies
11
Views
2K
High School What Are the Implications of Space Being the Ideal Medium for Light?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad KELT-4Ab Orbital Characteristics
  • · Replies 8 ·
Replies
8
Views
2K
High School E=mc^2 & Universe Expansion - Answers Wanted!
  • · Replies 9 ·
Replies
9
Views
2K
Undergrad Virtual Particles: Inflation vs Present Universe
  • · Replies 7 ·
Replies
7
Views
2K
High School Entropy is greater in galaxies or pre atomic era
  • · Replies 12 ·
Replies
12
Views
1K
Graduate What percentage of the universe's mass is contributed by neutrinos?
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad Cosmic Microwave Background Radiation Anisotropies
  • · Replies 8 ·
Replies
8
Views
3K
High School Could Supermassive Black Holes Be More Common Than We Thought?
  • · Replies 13 ·
Replies
13
Views
2K
High School Is Extra Terrestrial Life Possible in This Universe?
  • · Replies 60 ·
3
Replies
60
Views
8K
High School Questions regarding pre Big Bang
  • · Replies 6 ·
Replies
6
Views
3K
Graduate What's the truth behind CCC's concentric circles prediction for the CMB?
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Is an Aragoscope Currently in Use?
  • · Replies 2 ·
Replies
2
Views
2K
High School Binary/Ternary Systems: Could Stars Orbit a Non-Stellar Central Object?
  • · Replies 23 ·
Replies
23
Views
3K
High School What can I expect to see with a 6inch mirror?
  • · Replies 4 ·
Replies
4
Views
1K
High School Continuous or discrete acceleration?
  • · Replies 11 ·
Replies
11
Views
4K
Stargazing Is a Telescope for Asteroids the Key to Discovering New Main Belt Objects?
  • · Replies 17 ·
Replies
17
Views
3K
Graduate Variance of mass inside a black hole
  • · Replies 6 ·
Replies
6
Views
2K
High School Binary Stars Observable with Binoculars: Periodicity
  • · Replies 6 ·
Replies
6
Views
2K
High School Can Space-Time Rip? What Causes Tears & Healing?
  • · Replies 4 ·
Replies
4
Views
3K
High School Can Light Ever Stand Still in the Universe?
  • · Replies 4 ·
Replies
4
Views
1K
Graduate Are we now alone in the Universe?
  • · Replies 10 ·
Replies
10
Views
2K
High School Big Bang versus No Beginning and No End.... What is the lates
  • · Replies 12 ·
Replies
12
Views
3K
Graduate Instability of Cosmology with Quantum Corrections
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Where to find galaxy mass function observational data?
  • · Replies 1 ·
Replies
1
Views
1K
High School Is There a Global Database for Public Domain Scientific Knowledge?
  • · Replies 14 ·
Replies
14
Views
2K
Stargazing Comets 252P/LINEAR and P/2016 BA14
  • · Replies 4 ·
Replies
4
Views
3K
Insights How Representative is the Night Sky? - Comments
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Convert to "Of Date" Apparent coordinates from "J2000" coordinates
  • · Replies 1 ·
Replies
1
Views
5K
Undergrad What is the similarity between the spectra of white dwarfs and the sun?
  • · Replies 6 ·
Replies
6
Views
2K
Graduate Astronomical Implications of Quantum Entanglement?
  • · Replies 4 ·
Replies
4
Views
2K
High School Day-related calculations for BC dates
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad VR/AR big bang model (Virtual Reality Simulation)
  • · Replies 4 ·
Replies
4
Views
2K
High School Gas Giants & Stars: Do They Have a Solid Part?
  • · Replies 5 ·
Replies
5
Views
2K
High School What Are the Latest Insights on CMB Anomalies from Ali Frolop and Douglas Scott?
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Does the Sun's Movement Create a Solar System Vortex Motion?
  • · Replies 1 ·
Replies
1
Views
2K
High School Why does light not have infinite mass?
  • · Replies 8 ·
Replies
8
Views
3K