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 What radiation can be detected at 1km high from Earth surface?
- hohoho87
- · Replies 1 ·
Graduate Calculate Star Mass from Radius: An Integration Approach
- Unto
- · Replies 2 ·
Undergrad Mass of molecular clouds versus stars
- marmot
- · Replies 1 ·
Graduate Nucleosynthesis and light curve of Supernovae Ia
- elouisa
- · Replies 2 ·
Graduate How do we deal with theories that are hard to prove or falsify?
- Luuk Steitner
- · Replies 10 ·
Graduate Resolving Olbers' Paradox: Is That Quote Wrong?
- Martin_G
- · Replies 28 ·
Undergrad What is the Titius-Bode Law and its significance?
- anvesh111
- · Replies 2 ·
Graduate Killing surface gravity for a Kerr black hole
- stevebd1
- · Replies 22 ·
Graduate Challenges in Understanding Dark Energy and Dark Matter: A Scientific Inquiry
- FayeKane
- · Replies 34 ·
Graduate How Do Astronomical Factors Influence Planetary Characteristics?
- kamurra2
- · Replies 3 ·
Graduate If you were to create a universe
- Freeman Dyson
- · Replies 12 ·
Undergrad Confused on Gravity: Is Gravitational Force Strong Enough for a Black Hole?
- beeger
- · Replies 5 ·
Graduate Coalescing Supermassive Black Holes
- shadowoftruth
- · Replies 3 ·
Graduate Can Super Strong Magnets Counteract Black Hole Gravity?
- krak
- · Replies 4 ·
Graduate Is mass constant or does it increase due to expansion of the universe?
- zeromodz
- · Replies 3 ·
Graduate Cloud of neutral hydrogen is moving towards us at a speed
- westdivo
- · Replies 1 ·
Graduate What is the Earth's emission spectrum as seen from outer space?
- theneedtoknow
- · Replies 4 ·
Graduate Evidence for Expansion Velocity change
- yogi
- · Replies 19 ·
Graduate Geographic location determination
- alseth
- · Replies 2 ·
Graduate CMB SLS one instant or over a period of time
- cbd1
- · Replies 4 ·
Undergrad Voyager & Newton: Orbits and Mechanics Questions
- edpell
- · Replies 1 ·
Graduate The Singularity of a Black Hole: Unanswered Questions
- qmstudent
- · Replies 16 ·
Undergrad Angular Momentum and the Big Bang
- AdkinsJr
- · Replies 9 ·
High School Moon Connected to Earth: What Happens Next?
- shaden
- · Replies 9 ·
Graduate Some help with a X-Ray astronomy question please
- Maitreya
- · Replies 4 ·
Graduate Could Dark Matter Be Explained by Time Dilation and Virtual Particles?
- BkBkBk
- · Replies 9 ·
Graduate What is the composition of the universe according to WMAP?
- icarus2
- · Replies 2 ·
Graduate Milky Way excess Microwave Radiation
- DarkStar7
- · Replies 1 ·
Undergrad Understanding the Expanding Universe: The Role of Energy and Acceleration
- tgramling
- · Replies 6 ·
Undergrad Where do the 'bars' in a barred spiral come from?
- Stark
- · Replies 6 ·
Graduate Redshift as a distance indicator
- taylrl3
- · Replies 4 ·
Graduate What is wrong with this argument?
- 0bydefinition
- · Replies 9 ·
Graduate How Do Earth's Uneven Gravity Fields Affect Spacecraft Flybys?
- xyz1971
- · Replies 2 ·
Graduate Thoughts on gravity and space time
- Bucko1001
- · Replies 4 ·
Undergrad Semi-major axis from cartesian co-ordinates
- Spanky Deluxe
- · Replies 8 ·
Graduate Can Space Really Be Created or Destroyed?
- Rubix
- · Replies 2 ·
Graduate Reverse Universe: Investigating Deductive Conclusions from Reversible Laws
- Vincit
- · Replies 2 ·
Graduate Einstein's Worm Holes: Derivation of Equation
- anvesh111
- · Replies 4 ·
Undergrad Is There Any Difference Between A Stretching or Expanding Universe?
- awktrc
- · Replies 19 ·
Graduate Can a Black Hole's Event Horizon Ever Collapse in on Itself?
- peteb
- · Replies 8 ·
Undergrad Space in Atoms: Fusing 2 Together - What Happens?
- vibjwb
- · Replies 11 ·
Graduate What Are the Orbital Periods and Star Mass for These Hypothetical Planets?
- ltung
- · Replies 2 ·
Undergrad Can Two Particles in a Vacuum Attract Each Other?
- Rubix
- · Replies 4 ·
High School Comparing Half Earths: Horizontal or Vertical Shadow Line?
- bcmarshall
- · Replies 23 ·
Undergrad Calculating Orbital Velocities in a Binary Star System
- theneedtoknow
- · Replies 4 ·
Undergrad Deriving Kepler's Law: Negative Sign Explained
- pureblade
- · Replies 8 ·
Graduate Does Time Slow Down in a Black Hole?
- Redrocket
- · Replies 3 ·
Graduate Find out how much the universe grew by during the period of inflation
- AaronKnight
- · Replies 2 ·
Graduate Gravities effect on the boundaries of the Universe
- TheDoorsOfMe
- · Replies 28 ·
Graduate Question about light getting sucked into a black hole
- ranrod
- · Replies 14 ·
Undergrad Is Faster than Light Travel Possible?
- Ultrastar 1
- · Replies 3 ·
Graduate Schwarzschild and Reissner–Nordström metrics
- Orion1
- · Replies 2 ·
Graduate Satellite using rung-kutta method for 4DOF or 6DOF simulation
- shakeel001
- · Replies 1 ·
Undergrad Question about gravity and density
- ranrod
- · Replies 3 ·
Graduate Could Particles be just distortions in Space?
- jhart
- · Replies 24 ·
High School Can I Make My Own Mirror for Astrophotography Using a 6in Blank?
- vincentm
- · Replies 2 ·
Undergrad What Caused the Universe to Expand So Quickly?
- Archosaur
- · Replies 17 ·
Are the Leonids putting on a show in 2009?
- chroot
- · Replies 6 ·
Graduate Dark energy can escape black holes.
- Richard87
- · Replies 1 ·
High School Are there green, purple and pink stars?
- Richard87
- · Replies 4 ·
Graduate Expanding universe or shrinking space(-time)
- Luuk Steitner
- · Replies 28 ·
Graduate Doppler shifted blackbody spectrum
- E92M3
- · Replies 5 ·
Graduate Mass loss through gravitational radiation
- madness
- · Replies 7 ·
Undergrad Understand Sideral Time & Calculations - Sept.22, Nov.22, RA 2200 Hours
- Borg
- · Replies 2 ·
Graduate Could the Big Bang Be a Collision of Parallel Universes?
- tanzanos
- · Replies 22 ·
High School Travelling to the other world by sending data
- anvesh111
- · Replies 1 ·
Graduate Seeking Information on the R-process
- darkchild
- · Replies 1 ·
Undergrad Does Gravity Act Faster Than the Speed of Light?
- mintparasol
- · Replies 15 ·
High School How Can We Visualize the Milky Way From Within?
- simpleton
- · Replies 3 ·
Undergrad Chemical composition of solar system
- S.Vasojevic
- · Replies 6 ·
Graduate Unravelling the History of Stars: 14 Billion Years
- thenewmans
- · Replies 2 ·
Graduate Can a photon catch up to your eye within a black hole?
- dragonskull1
- · Replies 3 ·
Lunar Reconnaissance Orbiter Photos
- diogenesNY
- · Replies 4 ·
Help me to find the article, please
- limarodessa
- · Replies 3 ·
Undergrad How To Find Angular Momentum of Elliptical Orbits
- carbon_mc
- · Replies 2 ·
Graduate Hydrostatic Equilibrium in General Relativity
- Totalderiv
- · Replies 3 ·
Graduate Jupiter's Equatorial Rotation Period
- hfenton
- · Replies 2 ·
Graduate Energy can be conerted into matter
- the_awesome
- · Replies 14 ·
Undergrad What Causes Earth's Elliptical Orbit?
- aranoff
- · Replies 29 ·
The more you learn, the less you know
- Pattonias
- · Replies 9 ·
Graduate Is this even scientifically possible?
- The_Absolute
- · Replies 6 ·
Graduate Present distance to surface of transluminal expansion
- yogi
- · Replies 8 ·
High School Understanding Earth's Rotation: The Effects on Telescope Observations
- crx
- · Replies 1 ·
Graduate How Does Relativity Affect Mass and Gravity in High-Speed Orbits?
- dizam
- · Replies 11 ·
Graduate Stellar Evolution - Detailed Colour Magnitude (HR) Diagram
- MattLiverpool
- · Replies 12 ·
High School The shape of our solar system's orbits.
- PrincePhoenix
- · Replies 35 ·
Graduate Do voids in the Universe influence the orientation of galaxies?
- Astronuc
- · Replies 62 ·
High School How Is Mars' Gravity Determined Without Direct Measurement?
- Coda
- · Replies 7 ·
Graduate Reverse Universe: Acceleration and Time Reversibility
- Vincit
- · Replies 2 ·
Graduate Cosmology inequality that I'm struggling to make sense of
- barnflakes
- · Replies 3 ·
Undergrad Planets Forming Inside vs. Outside the Ice Line
- KevinMWHM
- · Replies 2 ·
Graduate How would you see an Event horizon?
- Stark
- · Replies 9 ·
Graduate Redshift, Quantum Theory, and the Standard Model
- Pedriana
- · Replies 3 ·
NASA Confirms Water on Moon - Exciting News!
- Pattonias
- · Replies 9 ·
Graduate Unraveling the Mystery of the Expanding Universe
- Superheavy
- · Replies 31 ·
High School Question about the orbit between Mars and Earth
- Coda
- · Replies 6 ·
Does anyone know how to find this paper?
- Ivan Seeking
- · Replies 10 ·
Graduate Cosmology Raw Data: Access Unanalyzed Experiments
- barnflakes
- · Replies 9 ·
Graduate Kerr Black Hole & Keplerian Stable Orbit
- stevebd1
- · Replies 4 ·
Undergrad Uncovering the Mystery of the Universe's Blinding White Light
- gothamxi
- · Replies 4 ·