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 Understanding Gravity: Causes, Sources, and Strength Explained
- 3112100000
- · Replies 19 ·
Undergrad How much of an effect does fusion have on a star's gravity?
- HowardVAgnew
- · Replies 8 ·
Graduate Transferring Matter between Bubble Universes
- Shaira
- · Replies 3 ·
Graduate Where Does Our Universe Exist in Relation to Branes?
- RJ Emery
- · Replies 1 ·
High School My random thoughts about the sun, black holes, and gravity.
- Cait
- · Replies 1 ·
High School What is the difference between Astronomy, Astrophyics and Cosmology?
- Lizwi
- · Replies 4 ·
Graduate Question about galaxy formation and black holes.
- fellupahill
- · Replies 2 ·
Graduate What are the Main Theories for the Current State and Structure of the Universe?
- Darkmatrix
- · Replies 3 ·
Graduate How Does Expansion Effect the Frequency of Light
- Drakkith
- · Replies 4 ·
Graduate Inflation and electroweak and GUT vacuum
- Lapidus
- · Replies 1 ·
Graduate Did Space Really Expand or Is It Just a Misinterpretation?
- waterfall
- · Replies 2 ·
Graduate Does how black holes inside galaxies orbit around the central black hole tell us
- fellupahill
- · Replies 8 ·
High School Has Anyone Explored Planetary Orbits Using Monkey Typewriter Method?
- xylophonic
- · Replies 27 ·
Graduate BLACK MATTER what is it? wheres it come from?
- arashbh
- · Replies 15 ·
Graduate Dark energy, matter in a Multiverse Schemata
- ArafuraOpal
- · Replies 1 ·
Graduate How Does Torque Affect the Dynamics of an Accretion Disc?
- Jamipat
- · Replies 8 ·
Graduate What is the relation between a black hole's mass and its kinetic energy?
- #Thomas#
- · Replies 3 ·
Undergrad How is the Barycenter Determined in a Two-Body System?
- solarblast
- · Replies 3 ·
Undergrad What are the strange absorption peaks on this solar spectrum?
- BucketOfFish
- · Replies 8 ·
Graduate Why is the Universe the Way it is?
- Michael3710
- · Replies 2 ·
Graduate Who said aether viscosity is ridiculously large ?
- ARANEV
- · Replies 26 ·
Graduate Critical density and total observable mass
- jimjohnson
- · Replies 3 ·
Graduate Observing someone falling into a Black Hole.
- Flatland
- · Replies 15 ·
High School Can Black Holes Grow, Merge, and Affect the Universe's End?
- juggalo2111
- · Replies 17 ·
Graduate Why does comoving Hubble radius increase with time?
- ck99
- · Replies 11 ·
Graduate Age of a vaccum energy dominated universe
- sri sharan
- · Replies 7 ·
Graduate Black Hole & Black Body Radiation: Why Can't It Absorb?
- nag555
- · Replies 6 ·
Graduate Can Intergalactic Gas Feel Hot Despite Its Low Density?
- goldsax
- · Replies 3 ·
What are the differences between Astrophysics and Astronomy?
- AerospaceKid
- · Replies 4 ·
Graduate Development of dimensional universe since big bang.
- BernieM
- · Replies 3 ·
Graduate Inflaton Field and Boucne Models
- skydivephil
- · Replies 7 ·
Undergrad Calculating distance using redshift
- Goldilocks32
- · Replies 3 ·
Graduate Calculation of the Distance to the Moons Apogee/Perigee ?
- Bjarne
- · Replies 2 ·
Graduate Non-ballistic big bang and expansion not from a center
- chaszz
- · Replies 67 ·
Graduate How to calculate the size and orientation of a tidal bulge
- em370
- · Replies 1 ·
Graduate Application of Condensation Sequence to extrasolar systems?
- PhoenixKnight
- · Replies 2 ·
High School How do scientists monitor the Sun's activity?
- kweba
- · Replies 9 ·
Graduate Estimation of central temperature of a star
- Darkkk
- · Replies 4 ·
High School Closest Habitable Planet: Gliese 581g | 79 Year Trip?
- jbobay2339
- · Replies 17 ·
Graduate Unifying GR + EM: Inflation & Gravity Effects
- ibysaiyan
- · Replies 3 ·
Graduate Why does light and gravity travel at the same speed?
- Abidal Sala
- · Replies 57 ·
Asking for your sources of images of the whole earth.
- Jonsson
- · Replies 4 ·
Impossible Thought: Galaxy Traveling at Light Speed, Milky Way Merging/Ripping
- AncientBrit
- · Replies 3 ·
Undergrad Black Holes, how much energy do they give off?
- sollinton
- · Replies 24 ·
Undergrad The proton flux in Solar System in keV range
- nykon
- · Replies 1 ·
Undergrad How do we calculate the magnitude of a system with binary stars?
- VHCR
- · Replies 2 ·
Graduate Rainbows in Space: Astronaut Sightings?
- Ender55
- · Replies 1 ·
Graduate Spacetime: Stretching or Growing? Or
- salvestrom
- · Replies 29 ·
Graduate Visualizing 4D Objects: Is it Possible?
- AlchemistK
- · Replies 12 ·
Graduate Density Parameter for radiation dominated universe
- ibysaiyan
- · Replies 3 ·
Graduate Galaxy expansion & cosmological constant
- ibysaiyan
- · Replies 10 ·
High School Sunrise Direction in the South Pole
- VHCR
- · Replies 3 ·
Undergrad Launching Spacecraft from the Moon: Is it Worth It?
- Mr8Manhattan
- · Replies 2 ·
Undergrad Orienting Space: 3D Travel from Earth, Center of Universe
- express-tl
- · Replies 2 ·
Graduate Can a Black Hole Collide with a Newly Formed Supernova Black Hole?
- AbsoluteZer0
- · Replies 1 ·
Undergrad Hydrogen and Helium-4 in thermodynamic equilibrium
- TrickyDicky
- · Replies 1 ·
Graduate Metric Perturbation: Finding Info for Einstein's Field Equation
- DagmPhys
- · Replies 1 ·
Graduate Does Hubble's Expansion voilate conservation of energy by redshifting EM waves?
- SubTachyon
- · Replies 6 ·
Graduate Could The Universe be a Wave emanating from a greater source?
- DaVince
- · Replies 1 ·
Stargazing Reflecting Telescope or Refracting Telescope?
- pravdt
- · Replies 16 ·
Undergrad Question on delta-v and escape velocity?
- shizz
- · Replies 1 ·
Graduate What caused galaxies to start spinning?
- fbs7
- · Replies 3 ·
High School Is the Universe Truly Unbounded?
- homeylova223
- · Replies 18 ·
Graduate Time and distance relative to an expanding universe
- Genx63
- · Replies 9 ·
Graduate How to design a weird but comfortable planet
- onomatomanic
- · Replies 10 ·
Graduate Neutrinos Interaction with EH of Black Holes
- PVastro
- · Replies 11 ·
Graduate Understanding Orbital Mechanics & Elliptical Paths
- whiterook6
- · Replies 1 ·
High School How big will the sun get when the seas begin to boil?
- Khantazm
- · Replies 5 ·
Graduate Duration of the original CMB radiation
- LexLuther
- · Replies 2 ·
Undergrad What is the expansion of the universe
- The5thElement
- · Replies 40 ·
Undergrad Where is the center of the universe?
- JediSouth
- · Replies 233 ·
Graduate How is the age of the universe determined through light and cosmic expansion?
- morningstar
- · Replies 17 ·
Graduate Could Black Holes Be Cosmic Centrifuges?
- jsradad
- · Replies 4 ·
Undergrad Understanding Arrays and Their Role in Converting Light into Data
- EnSlavingBlair
- · Replies 1 ·
Graduate Is There a Weak Repulsive Force of Empty Space in the Universe?
- jadrian
- · Replies 6 ·
Graduate Applying the uncertinty principle to the big bang
- DavidFi
- · Replies 2 ·
Undergrad Why do neutrinos escape the sun's core faster than photons?
- SHISHKABOB
- · Replies 9 ·
Graduate Galaxy size particle accelerator
- waterfall
- · Replies 11 ·
Graduate I've got my FTL boots on (another silly black hole question)
- Spourk
- · Replies 24 ·
Undergrad Is the Shapiro time delay effect accepted in science ?
- guacamolewar
- · Replies 8 ·
Graduate Can Radar Be Used to Map Distant Planets?
- Vinni
- · Replies 7 ·
High School Comet Death Dive Into Sun Seen in Detail for 1st Time
- Astronuc
- · Replies 4 ·
Graduate Hydrostatic Equilibrium in an Accretion Disc
- Jamipat
- · Replies 9 ·
Undergrad Venus: Slowing Rotation Detected by Venera, Magellan, and Venus Express
- Dotini
- · Replies 3 ·
Undergrad How Do You Convert Proton Flux from 1/(cm^2 s sr) to 1/(cm^2 s)?
- nykon
- · Replies 3 ·
Graduate Cluster Intergalactic Gas Heating & Cooling Problem
- Saul
- · Replies 6 ·
How Big Is the Universe?
- Ryan_m_b
- · Replies 21 ·
Undergrad Cepheid Variables in Distant Galaxies
- Ty1erC
- · Replies 9 ·
Graduate Questions regarding the Cause of the Universe
- Rtztgue
- · Replies 12 ·
Graduate Is the Light Cone a Valid Representation of Light's Behavior?
- zarmewa
- · Replies 2 ·
Graduate What is the role of elasticity in space-time according to Sakharov's theory?
- Fuzzy Logic
- · Replies 5 ·
High School Is Outer Space Truly Infinite? The Never-Ending Question of Exploration
- blckndgldfn
- · Replies 21 ·
Graduate Center of the Universe - Is it Possible?
- superdave
- · Replies 62 ·
Graduate Units problem in Keplerian equation
- solarblast
- · Replies 10 ·
Undergrad Angular Velocity and Spin/Orbital Angular Momentum of Jupiter
- theKeeblerElf
- · Replies 2 ·
High School Stationary Satellites: Can We Orbit at the Poles?
- Grimstone
- · Replies 11 ·
Undergrad How many kinds of force exist between Planets?
- oem7110
- · Replies 17 ·
Undergrad Absolute Magnitude Calculation, How?
- capcom
- · Replies 2 ·
Graduate The End of the Universe: A Black Hole Solution?
- Abidal Sala
- · Replies 54 ·
Graduate Measurement of c using Bradley and 1905 SRT aberration models
- Ken More
- · Replies 14 ·