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.
Threads
High School Astrophysicists and their use of physics in their studies?
- Lili123
- · Replies 4 ·
Graduate How can radiation from the Big Bang come from all directions?
- dr-spock
- · Replies 43 ·
Stargazing Which telescope is best for amateur stargazing?
- Yashbhatt
- · Replies 34 ·
High School The Mysterious Movement of the Moon: What Does It Mean for Our Weight?
- mikebpr
- · Replies 16 ·
Undergrad Homemade Cosmic Microwave Background detector
- PedroLencastre
- · Replies 5 ·
Graduate What Is the Rh = ct Cosmology?
- Buzz Bloom
- · Replies 2 ·
High School Why Doesn't Earth's Rotation Affect Flight Times?
- RBeckerfilms9
- · Replies 19 ·
Graduate Universe has to have finite size - doesn't it?
- Sxlcartron
- · Replies 12 ·
Graduate Magnetic field in early universe
- shadishacker
- · Replies 9 ·
Help finding some info about the movement of the observable universe
- Harley Cabral
- · Replies 5 ·
Graduate Is There Evidence for a Cyclic Universe?
- 117
- · Replies 7 ·
Undergrad Milky Way stole its farthest star cluster from another galaxy
- CygnusX-1
- · Replies 2 ·
High School Weight of Objects in Space: Explained in Layman's Terms
- AGC8
- · Replies 4 ·
Undergrad Is It Possible to Do Photometry Without Using a CCD?
- mishima
- · Replies 3 ·
Graduate Matter Antimatter Annihilation event?
- gjonesy
- · Replies 2 ·
Graduate How Does the Hypersine Function Relate to the Expansion of the Universe?
- marcus
- · Replies 86 ·
Graduate Questions re: Matter-Antimatter Annihilation
- Buzz Bloom
- · Replies 8 ·
Undergrad Space Travel to Mars: Overcoming Atmosphere & Creating a Bus Stop in Space
- RocketShip
- · Replies 9 ·
High School Watching Earth travel in space....what should be the location
- abhaybakshi
- · Replies 4 ·
Undergrad Galaxy and Stars: Questions Answered
- Huej
- · Replies 3 ·
Undergrad What Is the Difference Between Surface Brightness and Apparent Brightness?
- Huej
- · Replies 8 ·
Graduate Cosmological expansion and uncertainty
- T S Bailey
- · Replies 4 ·
Graduate WIMPs or MACHOs: Which Dark Matter Candidate Holds More Promise?
- Quds Akbar
- · Replies 5 ·
Graduate What information can be derived from the pulsars featured on the Voyager plate?
- Stephanus
- · Replies 7 ·
Pleiades Visible: Last Night -Subaru WRX to Ferrari F12
- Andy Resnick
- · Replies 2 ·
Graduate Does rest mass increase in conformal co-ordinates?
- jcap
- · Replies 1 ·
Graduate Notes on Star Formation: A Primer for Stellar Formation
- Chronos
- · Replies 1 ·
Undergrad Einstein equivalence principle
- Sobi
- · Replies 7 ·
Graduate Is the higgs field the same as spacetime foam?
- tybeedave
- · Replies 11 ·
Graduate How Does General Relativity Predict an Expanding Universe
- 117
- · Replies 10 ·
Graduate Viscous Disc Paradox: How Does Friction Operate?
- snorkack
- · Replies 3 ·
Graduate Did the universe really have zero extent at the beginning?
- Smattering
- · Replies 17 ·
Graduate Time dependence of the Ratio Hubble length to scale factor
- timmdeeg
- · Replies 14 ·
High School A circle in the Hubble Ultra Deep Field picture?
- Iconoclast
- · Replies 3 ·
Undergrad Newest exoplanet close enough to study its potential atmosphere
- DaveC426913
- · Replies 5 ·
Graduate What force is created before supernova explosion?
- Subrata Paul
- · Replies 40 ·
High School What are the various types of cosmic explosions?
- Sundown444
- · Replies 8 ·
Graduate Definition of Energy in Friedmann equations?
- jcap
- · Replies 1 ·
Graduate Multiple big bangs in one continuum - Question
- Pizza
- · Replies 29 ·
Graduate Visibility of Matter in the Universe
- SYahoo
- · Replies 17 ·
Graduate Is the Universe Truly Empty or Filled with Potential?
- David Brill
- · Replies 6 ·
Graduate How many generations old is our system?
- Chrisg1960
- · Replies 4 ·
Undergrad Basic Astrodynamics: Understanding Total Energy
- BaryS
- · Replies 2 ·
Undergrad Why do some planets occlude the Sun while others do not?
- Chrisg1960
- · Replies 8 ·
Graduate Moon Landing Q&A: Solar Winds & Astronauts
- Gaz
- · Replies 4 ·
Graduate Total mass and/or future of dark energy = cyclic universe?
- mykamakiri
- · Replies 14 ·
Graduate Spacetime explanation to describe non-gravitational forces
- gulfcoastfella
- · Replies 4 ·
Graduate Could Zipf's Law and Dark Matter be linked in the cosmos?
- Justice Hunter
- · Replies 14 ·
Graduate Gravity, Dark Matter and Dark Energy are all one
- wolram
- · Replies 5 ·
Graduate Cosmology's sole "rate of expansion" is declining
- marcus
- · Replies 52 ·
High School About the use of wormhole in the interstellar movie
- Quasi Lunatik
- · Replies 1 ·
Stray Asteroid or Unknown Meteor? Meteor Crash in Thailand Captured on Dashcam!
- Nidum
- · Replies 4 ·
Graduate How can quantum tunneling create Big Bang after heat death?
- goat-on-a-stick
- · Replies 8 ·
Graduate Why is the non-zero value of spatial curvature +/- 1?
- sunrah
- · Replies 7 ·
Graduate Practice Images for CCD Photometry?
- mishima
- · Replies 2 ·
High School What Do We Need to Survive on Mars?
- jhukin
- · Replies 1 ·
Graduate Is the metric basis for space expanding as the universe expands?
- Jim Hasty
- · Replies 2 ·
Undergrad Creating something from 'nothing' in our Universe
- spacecadet11
- · Replies 6 ·
Undergrad Zero energy universe means nothing exists at all times
- George bailey
- · Replies 5 ·
Undergrad The Universe's Sum: Is Zero Theory Plausible?
- Brunolem33
- · Replies 9 ·
Graduate Trying to understand Dark Energy
- rede96
- · Replies 40 ·
Graduate Alternative hypotheses regarding dark energy?
- R. E. Nettleton
- · Replies 8 ·
Graduate Cold Spot in CMB: Real or Systemic Error?
- wolram
- · Replies 4 ·
Graduate How have N Body simulations solved the missing satellite problem in ΛCDM?
- wolram
- · Replies 1 ·
Undergrad Earth's orbit & precession affected by Venus & Jupiter?
- innerlight
- · Replies 5 ·
High School Where is Tau Ceti Located in the Night Sky?
- Chinspinner
- · Replies 4 ·
High School Something escapes the corona of a black hole
- elusiveshame
- · Replies 3 ·
Graduate What Is the Most Relevant Contribution to Earth's Orbit After the Sun?
- james_berlin
- · Replies 2 ·
Undergrad Center of Lift vs. Center of Thrust
- Gbl911
- · Replies 4 ·
Graduate Could an Electron-Proton Pair Form an Atom in an Alternative Universe?
- motleycat
- · Replies 2 ·
Graduate Does a finite universe require 4 spatial dimensions?
- dilletante
- · Replies 13 ·
Graduate Are modified gravity models viable
- wolram
- · Replies 15 ·
Graduate What happens to coronal mass ejections?
- newjerseyrunner
- · Replies 7 ·
Graduate What does the big bang theory really tells us?
- vinicius0197
- · Replies 2 ·
Graduate Is the Universe's Expansion Truly Slowing Down?
- Megalepton
- · Replies 2 ·
Graduate Center of Mass in Elliptical Space
- Ontophobe
- · Replies 5 ·
Graduate What proportion of stars have proper motion
- wolram
- · Replies 5 ·
Graduate Why low precision of the radius of Sun's orbit in MW?
- Buzz Bloom
- · Replies 15 ·
Graduate Orbital Momentum: Equal or Variable?
- dean barry
- · Replies 15 ·
High School NEO 2015 TB145: 5 Facts About "Halloween Asteroid
- Astronuc
- · Replies 2 ·
Graduate Are the Friedmann Equations Applicable to the Pre-Inflationary Epoch?
- timmdeeg
- · Replies 23 ·
Graduate Where does the mass of a black hole come from?
- Brunolem33
- · Replies 1 ·
Graduate Superfluid Dark Matter: A Review of Theory & Evidence
- Hornbein
- · Replies 1 ·
Undergrad Can I use the Fourier Transform to analyze the Sun's Spectrum?
- Hugom42
- · Replies 3 ·
Graduate Is the True Vacuum in de Sitter Space Characterized by Minimum Mass?
- slatts
- · Replies 2 ·
Graduate Neutron star warm matter - temperature?
- Vrbic
- · Replies 5 ·
Graduate Has neutrino redshift been observed?
- jcap
- · Replies 1 ·
Stargazing Some tips for a better experience of stargazing using 76 mm telescope
- ayush solanki
- · Replies 14 ·
Undergrad Can Quantum Time and Space Have Countable States After the Big Bang?
- Omega0
- · Replies 11 ·
Undergrad Galaxy Mass - How much is stellar/gas?
- SteveDC
- · Replies 1 ·
Undergrad Use 3D laser scanning to map Outer Space?
- Kelson Adams
- · Replies 9 ·
Undergrad Q: Limit on a moon's orbital radius due to sun's gravity
- Buzz Bloom
- · Replies 4 ·
Stargazing Remote Controlling Truss Dobsonian Telescope?
- GiantSheeps
- · Replies 8 ·
High School Cell phones used to detect cosmic rays worldwide
- Hornbein
- · Replies 3 ·
High School "WT1190F" is the name for space junk that will hit Earth
- jim mcnamara
- · Replies 2 ·
Experience the Milky Way via 46 billion pixels
- jedishrfu
- · Replies 3 ·
Graduate Why Are Subterranean Colonies Rarely Proposed in Space Colonization Scenarios?
- #Thomas#
- · Replies 7 ·
Graduate Does a rigid box of gas cool over cosmological timescales?
- jcap
- · Replies 1 ·
Graduate When Did We Last Get a Glimpse of the Big Bang?
- Helios
- · Replies 34 ·
Calculate the Gravity of a Black Hole
- ZavraD
- · Replies 6 ·