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
Graduate Questions about the balloon analogy
- Rob Haskell
- · Replies 11 ·
Stargazing Astrophotography -- Best Telescopes?
- Kelson Adams
- · Replies 12 ·
Undergrad How fast to shoot a bullet for it to hit the moon?
- Treva31
- · Replies 20 ·
High School Rapid Formation of the Moon: Insights from Theia Impact
- Nobbstradamus
- · Replies 5 ·
Graduate Does mass slow the expansion of space?
- AndyFin
- · Replies 5 ·
Graduate How to stop a black hole forming?
- Graynell
- · Replies 3 ·
Graduate Can Higgs be the inflaton - can LHC produce an inflaton 750
- kodama
- · Replies 2 ·
Graduate Is There Direct Evidence of Cosmic Re-acceleration?
- wolram
- · Replies 1 ·
Graduate Jumbled up spectra of stars/glaxies
- terahertz
- · Replies 3 ·
Graduate An article stating Cosmology is in crisis. Is it in crisis?
- Tanelorn
- · Replies 3 ·
Graduate Are Dual Supermassive Black Holes in Galaxies Rare and Insignificant?
- Astronuc
- · Replies 4 ·
Is Global Warming Responsible for My Amazing Astrophotography?
- Andy Resnick
- · Replies 7 ·
Insights The Balloon Analogy .... the Good, the Bad, and the Ugly - Comments
- phinds
- · Replies 58 ·
Graduate Quark Overproduction in the Big Rip Theory
- Ryan Reed
- · Replies 1 ·
Graduate Gravity wave cancellation cause space expansion?
- udtsith
- · Replies 1 ·
Graduate What happens when a star and a black hole collide?
- EinsteinFan
- · Replies 4 ·
Graduate How do we know that the universe is three dimensional?
- Fiziqs
- · Replies 5 ·
Graduate Large amount of mercury in space
- Dhanush Shenoy
- · Replies 25 ·
Graduate The Big Bang & What's Not: 2016 Edge Essays
- Keith_McClary
- · Replies 2 ·
Graduate Maximum velocity of a falling object at the event horizon?
- Bernie G
- · Replies 4 ·
High School Light & Blackhole: Can Light Escape?
- Salman Rayeen
- · Replies 4 ·
Undergrad Why do pulsars emit electromagnetic waves from their poles?
- 24forChromium
- · Replies 2 ·
Graduate Why does dark matter pool in the CMB plasma?
- Dr. Strange
- · Replies 11 ·
Graduate Conservation of energy and space expansion
- Lopes1801
- · Replies 4 ·
Graduate Question reguarding the expanding universe
- Daniel K
- · Replies 42 ·
Graduate Why is there no continuity on the temperature of the CMB?
- sandrogiongo
- · Replies 6 ·
The Science Behind Children's Love for Cinnamon Toast Crunch
- Garth
- · Replies 2 ·
Graduate Time Dilation Definition: What is Time Dilation?
- Greg Bernhardt
- · Replies 4 ·
High School What would happen if two stars collided?
- ThomasLLS
- · Replies 3 ·
Undergrad How can I generate an elliptical orbit using only position and velocity data?
- 450AHX
- · Replies 4 ·
High School Space X falcon 9. Why return to the launch site?
- DTM
- · Replies 17 ·
Graduate Gravity around small black holes
- Paul Katan
- · Replies 2 ·
Undergrad Hubble Finds Origin of Huge Cloud Crashing into our Galaxy
- CygnusX-1
- · Replies 2 ·
Undergrad How E Folds relates to our universe
- wolram
- · Replies 3 ·
Undergrad What is the energy in a cubic km of empty space?
- Dr. Strange
- · Replies 5 ·
Graduate Searching for Dark Matter in 3.5 Kev Line Mystery
- Chronos
- · Replies 2 ·
Undergrad How Does Supernova Light Dimness Indicate Universal Acceleration?
- cosmos1111
- · Replies 9 ·
Graduate Another age problem in the early universe?
- Garth
- · Replies 2 ·
Graduate Is Dark Matter Consumption by Black Holes Equal in a Galaxy?
- jgreene
- · Replies 9 ·
Graduate Accelerating Expansion and Mediocrity Priniciple
- DaveC426913
- · Replies 8 ·
High School Birth of the Earth: Big Bang, Dark Matter & More
- Yashas CS
- · Replies 4 ·
Undergrad Concerning SOHO's orbit, and its corrections.
- Tasem
- · Replies 4 ·
Undergrad Why can we not see auroras at lower latitudes?
- MozAngeles
- · Replies 1 ·
Undergrad What are the negligible forces in the solar system besides gravity?
- whatisreality
- · Replies 8 ·
Graduate How could the infant universe have existed as a singularity?
- R. E. Nettleton
- · Replies 6 ·
Graduate Stars in the early universe and stellar processes
- Teichii492
- · Replies 51 ·
Anyone in Honolulu interested in astronomy, etc.?
- marinamiddleton
- · Replies 1 ·
Graduate Relationship between energy, information and dark energy
- Greta
- · Replies 8 ·
Graduate How can a black hole be infinitely small?
- Aaron380
- · Replies 5 ·
Undergrad Spectra of Stars: Reliable Data & Quantitative Analysis
- NihalRi
- · Replies 10 ·
Help My Extraterrestrial Friend Arrive to Madrid's New Year's Eve Party
- DrSirius
- · Replies 4 ·
High School Into what is our universe expanding ?
- Salman Ranjha
- · Replies 1 ·
Graduate Distinction between observable and unobservable universe
- Chiclayo guy
- · Replies 11 ·
Graduate What are the key challenges facing aerospace tech for a manned Mars mission?
- Jay K.
- · Replies 1 ·
Undergrad Geocentric model: how long was it taught in universities?
- Aidyan
- · Replies 7 ·
Graduate Could accretion on a neutron star’s poles cause the jets?
- Bernie G
- · Replies 46 ·
Undergrad Universe Expansion: Is it Possible Beyond Light Speed?
- 8143902066
- · Replies 1 ·
Graduate How is time incorporated into the robertson walker metric?
- NihalRi
- · Replies 6 ·
Graduate Expansion of the Universe and Thermodynamics
- g_mogni
- · Replies 18 ·
Graduate Measuring space expansion without redshift
- Netspirit
- · Replies 9 ·
Graduate How can an inflaton field maintain its energy while expanding without diluting?
- _PJ_
- · Replies 8 ·
Undergrad Information on Dark Matter and Dark Energy
- Tony Stark
- · Replies 4 ·
Undergrad Can the Universe Expand Faster Than Light?
- Jakecp
- · Replies 51 ·
Graduate Might Dark Energy have anything to do with Inflation?
- Gerinski
- · Replies 6 ·
Graduate Proper distance integral limits seem wrong
- deneve
- · Replies 2 ·
Undergrad Another math in another universe?
- Saif Almazrouei
- · Replies 4 ·
Graduate Gravitational force of a neutron star
- JohnnyGui
- · Replies 31 ·
Graduate Space Expanding Proportional to Distance
- Daniel K
- · Replies 11 ·
Graduate Why does the universe have no net charge?
- Buzz Bloom
- · Replies 20 ·
Graduate New valuation of ΛCDM Cosmology by 41 authors....
- grauitate
- · Replies 6 ·
Graduate Size of Universe: Evidence of Finite Limits?
- rjbeery
- · Replies 8 ·
Graduate How cosmologists determine universe flatness
- Buzz Bloom
- · Replies 4 ·
Undergrad Can gravitational waves cancel out?
- udtsith
- · Replies 1 ·
Graduate Shape of quark matter bubble in a magnetized neutron star
- Bernie G
- · Replies 21 ·
Graduate Proper distance problem/interpretation
- deneve
- · Replies 4 ·
Graduate Could Dark Energy lead to a big bang?
- newjerseyrunner
- · Replies 3 ·
Graduate Explaining the Luminosity-Temperature Relationship for Stars on the Henyey Track
- snorkack
- · Replies 27 ·
Graduate Does accretion reduce the magnetic field of a neutron star?
- Bernie G
- · Replies 11 ·
New Closest Earth-like Planet (20/12/15)
- RooksAndBooks
- · Replies 5 ·
Graduate Why is it that scientists think that dark matter annihilates
- rmoh13
- · Replies 4 ·
Graduate Galaxy centre and rotation curve
- Shailesh Pincha
- · Replies 2 ·
Graduate What does expand: Space or Spacetime?
- Smattering
- · Replies 37 ·
Graduate Cosmic Mystery: Was There Baryonic Matter During Radiation Domination?
- wolram
- · Replies 6 ·
Graduate How are the effects of antimatter on gravity different?
- rmoh13
- · Replies 3 ·
High School Why does space appear differently to different astronauts?
- Ian J.
- · Replies 5 ·
Undergrad Black hole smaller than a neutron star?
- Slyster
- · Replies 7 ·
Undergrad Why Do Pluto and Charon Share the Same Diffraction Spike Orientation?
- Imager
- · Replies 1 ·
Graduate Neutron Stars from White Dwarf Mergers: Under 1.4 SM?
- AdamAutism1998
- · Replies 2 ·
Undergrad What if there was a black hole in the middle of a nebula?
- Matthew Knowles
- · Replies 4 ·
Graduate Can We Engineer Our Own Stars to Prevent the Heat Death of the Universe?
- edwardauron
- · Replies 2 ·
Undergrad Extraterrestrial Archaeological Expeditions?
- Fuinne
- · Replies 7 ·
Undergrad Spectroscopy and the doppler effect
- The Subject
- · Replies 4 ·
Undergrad Trying to calculate Orbit figures with C# and 3D space
- Ajes
- · Replies 8 ·
Undergrad Quick question on orbital eccentricity and mechanical energy
- Contadoren11
- · Replies 3 ·
Graduate The unification of quantum theory and relativity theory
- BPL3
- · Replies 1 ·
Undergrad Energy production of star given mass?
- Lagraaaange
- · Replies 12 ·
Graduate Hawking radiation from not-a-black-hole?
- nikkkom
- · Replies 1 ·
Graduate What's the most massive white dwarf in the MW?
- AdamAutism1998
- · Replies 11 ·
Graduate R136a defies Laws of Stellar Evolution
- AdamAutism1998
- · Replies 22 ·
Graduate Ptolemy's Theory of the Empty Focus of an Elliptical Orbit
- greswd
- · Replies 4 ·