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 Magnetic field in early universe
  • · Replies 9 ·
Replies
9
Views
2K
Help finding some info about the movement of the observable universe
  • · Replies 5 ·
Replies
5
Views
2K
Graduate Is There Evidence for a Cyclic Universe?
  • · Replies 7 ·
Replies
7
Views
6K
Undergrad Milky Way stole its farthest star cluster from another galaxy
  • · Replies 2 ·
Replies
2
Views
2K
High School Weight of Objects in Space: Explained in Layman's Terms
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Is It Possible to Do Photometry Without Using a CCD?
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Matter Antimatter Annihilation event?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate How Does the Hypersine Function Relate to the Expansion of the Universe?
  • · Replies 86 ·
3
Replies
86
Views
14K
Graduate Questions re: Matter-Antimatter Annihilation
  • · Replies 8 ·
Replies
8
Views
2K
Undergrad Space Travel to Mars: Overcoming Atmosphere & Creating a Bus Stop in Space
  • · Replies 9 ·
Replies
9
Views
3K
High School Watching Earth travel in space....what should be the location
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Galaxy and Stars: Questions Answered
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad What Is the Difference Between Surface Brightness and Apparent Brightness?
  • · Replies 8 ·
Replies
8
Views
2K
Graduate Cosmological expansion and uncertainty
  • · Replies 4 ·
Replies
4
Views
2K
Graduate WIMPs or MACHOs: Which Dark Matter Candidate Holds More Promise?
  • · Replies 5 ·
Replies
5
Views
2K
Graduate What information can be derived from the pulsars featured on the Voyager plate?
  • · Replies 7 ·
Replies
7
Views
3K
Pleiades Visible: Last Night -Subaru WRX to Ferrari F12
  • · Replies 2 ·
Replies
2
Views
1K
Graduate Does rest mass increase in conformal co-ordinates?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Notes on Star Formation: A Primer for Stellar Formation
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad Einstein equivalence principle
  • · Replies 7 ·
Replies
7
Views
2K
Graduate Is the higgs field the same as spacetime foam?
  • · Replies 11 ·
Replies
11
Views
2K
Graduate How Does General Relativity Predict an Expanding Universe
  • · Replies 10 ·
Replies
10
Views
5K
Graduate Viscous Disc Paradox: How Does Friction Operate?
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Did the universe really have zero extent at the beginning?
  • · Replies 17 ·
Replies
17
Views
2K
Graduate Time dependence of the Ratio Hubble length to scale factor
  • · Replies 14 ·
Replies
14
Views
3K
High School A circle in the Hubble Ultra Deep Field picture?
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Newest exoplanet close enough to study its potential atmosphere
  • · Replies 5 ·
Replies
5
Views
2K
Graduate What force is created before supernova explosion?
  • · Replies 40 ·
2
Replies
40
Views
7K
High School What are the various types of cosmic explosions?
  • · Replies 8 ·
Replies
8
Views
2K
Graduate Definition of Energy in Friedmann equations?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Multiple big bangs in one continuum - Question
  • · Replies 29 ·
Replies
29
Views
4K
Graduate Visibility of Matter in the Universe
  • · Replies 17 ·
Replies
17
Views
2K
Graduate Is the Universe Truly Empty or Filled with Potential?
  • · Replies 6 ·
Replies
6
Views
2K
Graduate How many generations old is our system?
  • · Replies 4 ·
Replies
4
Views
3K
Undergrad Basic Astrodynamics: Understanding Total Energy
  • · Replies 2 ·
Replies
2
Views
37K
Undergrad Why do some planets occlude the Sun while others do not?
  • · Replies 8 ·
Replies
8
Views
2K
Graduate Moon Landing Q&A: Solar Winds & Astronauts
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Total mass and/or future of dark energy = cyclic universe?
  • · Replies 14 ·
Replies
14
Views
3K
Graduate Spacetime explanation to describe non-gravitational forces
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Could Zipf's Law and Dark Matter be linked in the cosmos?
  • · Replies 14 ·
Replies
14
Views
3K
Graduate Gravity, Dark Matter and Dark Energy are all one
  • · Replies 5 ·
Replies
5
Views
2K
Graduate Cosmology's sole "rate of expansion" is declining
  • · Replies 52 ·
2
Replies
52
Views
8K
High School About the use of wormhole in the interstellar movie
  • · Replies 1 ·
Replies
1
Views
2K
Stray Asteroid or Unknown Meteor? Meteor Crash in Thailand Captured on Dashcam!
  • · Replies 4 ·
Replies
4
Views
2K
Graduate How can quantum tunneling create Big Bang after heat death?
  • · Replies 8 ·
Replies
8
Views
10K
Graduate Why is the non-zero value of spatial curvature +/- 1?
  • · Replies 7 ·
Replies
7
Views
2K
Graduate Practice Images for CCD Photometry?
  • · Replies 2 ·
Replies
2
Views
2K
High School What Do We Need to Survive on Mars?
  • · Replies 1 ·
Replies
1
Views
1K
Graduate Is the metric basis for space expanding as the universe expands?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Creating something from 'nothing' in our Universe
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad Zero energy universe means nothing exists at all times
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad The Universe's Sum: Is Zero Theory Plausible?
  • · Replies 9 ·
Replies
9
Views
2K
Graduate Trying to understand Dark Energy
  • · Replies 40 ·
2
Replies
40
Views
5K
Graduate Alternative hypotheses regarding dark energy?
  • · Replies 8 ·
Replies
8
Views
2K
Graduate Cold Spot in CMB: Real or Systemic Error?
  • · Replies 4 ·
Replies
4
Views
2K
Graduate How have N Body simulations solved the missing satellite problem in ΛCDM?
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Earth's orbit & precession affected by Venus & Jupiter?
  • · Replies 5 ·
Replies
5
Views
4K
High School Where is Tau Ceti Located in the Night Sky?
  • · Replies 4 ·
Replies
4
Views
1K
High School Something escapes the corona of a black hole
  • · Replies 3 ·
Replies
3
Views
2K
Graduate What Is the Most Relevant Contribution to Earth's Orbit After the Sun?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Center of Lift vs. Center of Thrust
  • · Replies 4 ·
Replies
4
Views
3K
Graduate Could an Electron-Proton Pair Form an Atom in an Alternative Universe?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Does a finite universe require 4 spatial dimensions?
  • · Replies 13 ·
Replies
13
Views
3K
Graduate Are modified gravity models viable
  • · Replies 15 ·
Replies
15
Views
3K
Graduate What happens to coronal mass ejections?
  • · Replies 7 ·
Replies
7
Views
3K
Graduate What does the big bang theory really tells us?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Is the Universe's Expansion Truly Slowing Down?
  • · Replies 2 ·
Replies
2
Views
1K
Graduate Center of Mass in Elliptical Space
  • · Replies 5 ·
Replies
5
Views
1K
Graduate What proportion of stars have proper motion
  • · Replies 5 ·
Replies
5
Views
2K
Graduate Why low precision of the radius of Sun's orbit in MW?
  • · Replies 15 ·
Replies
15
Views
3K
Graduate Orbital Momentum: Equal or Variable?
  • · Replies 15 ·
Replies
15
Views
3K
High School NEO 2015 TB145: 5 Facts About "Halloween Asteroid
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Are the Friedmann Equations Applicable to the Pre-Inflationary Epoch?
  • · Replies 23 ·
Replies
23
Views
4K
Graduate Where does the mass of a black hole come from?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Superfluid Dark Matter: A Review of Theory & Evidence
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Can I use the Fourier Transform to analyze the Sun's Spectrum?
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Is the True Vacuum in de Sitter Space Characterized by Minimum Mass?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Neutron star warm matter - temperature?
  • · Replies 5 ·
Replies
5
Views
2K
Graduate Has neutrino redshift been observed?
  • · Replies 1 ·
Replies
1
Views
1K
Stargazing Some tips for a better experience of stargazing using 76 mm telescope
  • · Replies 14 ·
Replies
14
Views
2K
Undergrad Can Quantum Time and Space Have Countable States After the Big Bang?
  • · Replies 11 ·
Replies
11
Views
1K
Undergrad Galaxy Mass - How much is stellar/gas?
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad Use 3D laser scanning to map Outer Space?
  • · Replies 9 ·
Replies
9
Views
2K
Undergrad Q: Limit on a moon's orbital radius due to sun's gravity
  • · Replies 4 ·
Replies
4
Views
2K
Stargazing Remote Controlling Truss Dobsonian Telescope?
  • · Replies 8 ·
Replies
8
Views
3K
High School Cell phones used to detect cosmic rays worldwide
  • · Replies 3 ·
Replies
3
Views
1K
High School "WT1190F" is the name for space junk that will hit Earth
  • · Replies 2 ·
Replies
2
Views
1K
Experience the Milky Way via 46 billion pixels
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Why Are Subterranean Colonies Rarely Proposed in Space Colonization Scenarios?
  • · Replies 7 ·
Replies
7
Views
2K
Graduate Does a rigid box of gas cool over cosmological timescales?
  • · Replies 1 ·
Replies
1
Views
1K
Graduate When Did We Last Get a Glimpse of the Big Bang?
  • · Replies 34 ·
2
Replies
34
Views
4K
Calculate the Gravity of a Black Hole
  • · Replies 6 ·
Replies
6
Views
2K
Graduate Orbit Dynamics in an Expanding Universe
  • · Replies 17 ·
Replies
17
Views
3K
High School Can Black Holes Really Die and What Are Their Secrets?
  • · Replies 76 ·
3
Replies
76
Views
9K
Undergrad How was Galileo able to observe Venus's phases?
  • · Replies 6 ·
Replies
6
Views
4K
High School How Are Black Holes Formed and What Are Their Key Facts?
  • · Replies 34 ·
2
Replies
34
Views
5K
High School Where Do Wormholes Take Us in Space and Time?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Can a See Saw Extend from Earth to Another Galaxy?
  • · Replies 25 ·
Replies
25
Views
2K
What Would a Trip from Earth to Orion Look Like?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Origins of the Fundamental Interactions/Forces
  • · Replies 3 ·
Replies
3
Views
2K