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 Why does Venus lack a magnetic field?
- Freeman Dyson
- · Replies 11 ·
Graduate Does matter exist only in space and time?
- Rishav1
- · Replies 7 ·
High School Why the Tides Increase Earth-Moon Distance
- kciweli
- · Replies 2 ·
High School What allows photons from stars to travel farther than man-made light?
- dizam
- · Replies 11 ·
Graduate How to scan the frequency at atmosphere by using PIC
- hohoho87
- · Replies 2 ·
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 Is the standard statement of Olbers' Paradox mathematically 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 Why do type 1a supernovae appear dimmer than expected?
- 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 How can gravity form a black hole if it's the weakest force?
- 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 Do the Voyager spacecraft orbits exactly obey Newtonian mechanics?
- edpell
- · Replies 1 ·
Graduate What happens to particles and fields at a black hole singularity?
- qmstudent
- · Replies 16 ·
Undergrad Angular Momentum and the Big Bang
- AdkinsJr
- · Replies 9 ·
High School What happens if you tie a rope between Earth and the Moon?
- shaden
- · Replies 9 ·
Graduate X-ray photon count for distant quasar spectrum
- Maitreya
- · Replies 4 ·
Graduate Could virtual particles account for dark matter through time dilation effects?
- 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 Does the big bang's initial energy cause eternal expansion or eventual contraction?
- 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 Can irreversible laws be deduced from reversible microscopic 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 What happens to atomic space when two nuclei fuse?
- 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 Would a half-Earth's shadow line appear horizontal or vertical from the Moon?
- bcmarshall
- · Replies 23 ·
Undergrad Calculating Orbital Velocities in a Binary Star System
- theneedtoknow
- · Replies 4 ·
Undergrad Why does the negative sign disappear when deriving Kepler's third law?
- 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 Can gravity slow down photons traveling away from a black hole?
- ranrod
- · Replies 14 ·
Undergrad How would a starship's surface area change if it traveled faster than light?
- 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 Does density affect gravity or just mass?
- 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 How did the universe expand 78 billion light-years in 13.7 billion years?
- 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 Sidereal time calculation for November 22 at 6pm local time
- 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 ·
Locating Zeldovich 1972 paper in Magic without Magic
- limarodessa
- · Replies 3 ·
Undergrad How To Find Angular Momentum of Elliptical Orbits
- carbon_mc
- · Replies 2 ·
Graduate Tolman-Oppenheimer-Volkoff equation and general relativity tensors
- Totalderiv
- · Replies 3 ·
Graduate Jupiter's Equatorial Rotation Period
- hfenton
- · Replies 2 ·
Graduate Energy can be conerted into matter
- the_awesome
- · Replies 14 ·
Undergrad Why is Earth's orbit elliptical?
- aranoff
- · Replies 29 ·
The more you learn, the less you know
- Pattonias
- · Replies 9 ·
Graduate Can all space-time and reality suddenly cease to exist?
- 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 Does Earth's orbital speed increase its mass and gravitational pull?
- 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 What is the universe expanding into?
- Superheavy
- · Replies 31 ·