Astronomy, Astrophysics, Cosmology Forum

Post thread
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.
High School What is the difference between Astronomy, Astrophyics and Cosmology?
  • Lizwi
  • · Replies 4 ·
Replies
4
Views
36K
Graduate Question about galaxy formation and black holes.
  • fellupahill
  • · Replies 2 ·
Replies
2
Views
4K
Graduate What are the Main Theories for the Current State and Structure of the Universe?
  • Darkmatrix
  • · Replies 3 ·
Replies
3
Views
3K
Graduate How Does Expansion Effect the Frequency of Light
  • Drakkith
  • · Replies 4 ·
Replies
4
Views
4K
Graduate Inflation and electroweak and GUT vacuum
  • Lapidus
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Did Space Really Expand or Is It Just a Misinterpretation?
  • waterfall
  • · Replies 2 ·
Replies
2
Views
3K
Graduate Does how black holes inside galaxies orbit around the central black hole tell us
  • fellupahill
  • · Replies 8 ·
Replies
8
Views
6K
High School Has Anyone Explored Planetary Orbits Using Monkey Typewriter Method?
  • xylophonic
  • · Replies 27 ·
Replies
27
Views
4K
Graduate BLACK MATTER what is it? wheres it come from?
  • arashbh
  • · Replies 15 ·
Replies
15
Views
5K
Graduate Dark energy, matter in a Multiverse Schemata
  • ArafuraOpal
  • · Replies 1 ·
Replies
1
Views
2K
Graduate How Does Torque Affect the Dynamics of an Accretion Disc?
  • Jamipat
  • · Replies 8 ·
Replies
8
Views
4K
Graduate What is the relation between a black hole's mass and its kinetic energy?
  • #Thomas#
  • · Replies 3 ·
Replies
3
Views
3K
Undergrad How is the Barycenter Determined in a Two-Body System?
  • solarblast
  • · Replies 3 ·
Replies
3
Views
4K
Undergrad What are the strange absorption peaks on this solar spectrum?
  • BucketOfFish
  • · Replies 8 ·
Replies
8
Views
4K
Graduate Why is the Universe the Way it is?
  • Michael3710
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Who said aether viscosity is ridiculously large ?
  • ARANEV
  • · Replies 26 ·
Replies
26
Views
6K
Graduate Critical density and total observable mass
  • jimjohnson
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Observing someone falling into a Black Hole.
  • Flatland
  • · Replies 15 ·
Replies
15
Views
12K
High School Can Black Holes Grow, Merge, and Affect the Universe's End?
  • juggalo2111
  • · Replies 17 ·
Replies
17
Views
5K
Graduate Why does comoving Hubble radius increase with time?
  • ck99
  • · Replies 11 ·
Replies
11
Views
6K
Graduate Age of a vaccum energy dominated universe
  • sri sharan
  • · Replies 7 ·
Replies
7
Views
3K
Graduate Black Hole & Black Body Radiation: Why Can't It Absorb?
  • nag555
  • · Replies 6 ·
Replies
6
Views
3K
Graduate Can Intergalactic Gas Feel Hot Despite Its Low Density?
  • goldsax
  • · Replies 3 ·
Replies
3
Views
4K
What are the differences between Astrophysics and Astronomy?
  • AerospaceKid
  • · Replies 4 ·
Replies
4
Views
10K
Graduate Development of dimensional universe since big bang.
  • BernieM
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Inflaton Field and Boucne Models
  • skydivephil
  • · Replies 7 ·
Replies
7
Views
3K
Undergrad Calculating distance using redshift
  • Goldilocks32
  • · Replies 3 ·
Replies
3
Views
14K
Graduate Calculation of the Distance to the Moons Apogee/Perigee ?
  • Bjarne
  • · Replies 2 ·
Replies
2
Views
6K
Graduate Non-ballistic big bang and expansion not from a center
  • chaszz
  • · Replies 67 ·
3
Replies
67
Views
20K
Graduate How to calculate the size and orientation of a tidal bulge
  • em370
  • · Replies 1 ·
Replies
1
Views
7K
Graduate Application of Condensation Sequence to extrasolar systems?
  • PhoenixKnight
  • · Replies 2 ·
Replies
2
Views
3K
High School How do scientists monitor the Sun's activity?
  • kweba
  • · Replies 9 ·
Replies
9
Views
8K
Graduate Estimation of central temperature of a star
  • Darkkk
  • · Replies 4 ·
Replies
4
Views
5K
High School Closest Habitable Planet: Gliese 581g | 79 Year Trip?
  • jbobay2339
  • · Replies 17 ·
Replies
17
Views
5K
Graduate Unifying GR + EM: Inflation & Gravity Effects
  • ibysaiyan
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Why does light and gravity travel at the same speed?
  • Abidal Sala
  • · Replies 57 ·
2
Replies
57
Views
12K
Asking for your sources of images of the whole earth.
  • Jonsson
  • · Replies 4 ·
Replies
4
Views
3K
Impossible Thought: Galaxy Traveling at Light Speed, Milky Way Merging/Ripping
  • AncientBrit
  • · Replies 3 ·
Replies
3
Views
3K
Undergrad Black Holes, how much energy do they give off?
  • sollinton
  • · Replies 24 ·
Replies
24
Views
17K
Undergrad The proton flux in Solar System in keV range
  • nykon
  • · Replies 1 ·
Replies
1
Views
3K
Undergrad How do we calculate the magnitude of a system with binary stars?
  • VHCR
  • · Replies 2 ·
Replies
2
Views
3K
Graduate Rainbows in Space: Astronaut Sightings?
  • Ender55
  • · Replies 1 ·
Replies
1
Views
3K
Graduate Spacetime: Stretching or Growing? Or
  • salvestrom
  • · Replies 29 ·
Replies
29
Views
9K
Graduate Visualizing 4D Objects: Is it Possible?
  • AlchemistK
  • · Replies 12 ·
Replies
12
Views
6K
Graduate Density Parameter for radiation dominated universe
  • ibysaiyan
  • · Replies 3 ·
Replies
3
Views
5K
Graduate Galaxy expansion & cosmological constant
  • ibysaiyan
  • · Replies 10 ·
Replies
10
Views
5K
High School Sunrise Direction in the South Pole
  • VHCR
  • · Replies 3 ·
Replies
3
Views
3K
Undergrad Launching Spacecraft from the Moon: Is it Worth It?
  • Mr8Manhattan
  • · Replies 2 ·
Replies
2
Views
3K
Undergrad Orienting Space: 3D Travel from Earth, Center of Universe
  • express-tl
  • · Replies 2 ·
Replies
2
Views
3K
Graduate Can a Black Hole Collide with a Newly Formed Supernova Black Hole?
  • AbsoluteZer0
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Hydrogen and Helium-4 in thermodynamic equilibrium
  • TrickyDicky
  • · Replies 1 ·
Replies
1
Views
3K
Graduate Metric Perturbation: Finding Info for Einstein's Field Equation
  • DagmPhys
  • · Replies 1 ·
Replies
1
Views
3K
Graduate Does Hubble's Expansion voilate conservation of energy by redshifting EM waves?
  • SubTachyon
  • · Replies 6 ·
Replies
6
Views
4K
Graduate Could The Universe be a Wave emanating from a greater source?
  • DaVince
  • · Replies 1 ·
Replies
1
Views
2K
Stargazing Reflecting Telescope or Refracting Telescope?
  • pravdt
  • · Replies 16 ·
Replies
16
Views
10K
Undergrad Question on delta-v and escape velocity?
  • shizz
  • · Replies 1 ·
Replies
1
Views
3K
Graduate What caused galaxies to start spinning?
  • fbs7
  • · Replies 3 ·
Replies
3
Views
2K
High School Is the Universe Truly Unbounded?
  • homeylova223
  • · Replies 18 ·
Replies
18
Views
5K
Graduate Time and distance relative to an expanding universe
  • Genx63
  • · Replies 9 ·
Replies
9
Views
4K
Graduate How to design a weird but comfortable planet
  • onomatomanic
  • · Replies 10 ·
Replies
10
Views
6K
Graduate Neutrinos Interaction with EH of Black Holes
  • PVastro
  • · Replies 11 ·
Replies
11
Views
4K
Graduate Understanding Orbital Mechanics & Elliptical Paths
  • whiterook6
  • · Replies 1 ·
Replies
1
Views
6K
High School How big will the sun get when the seas begin to boil?
  • Khantazm
  • · Replies 5 ·
Replies
5
Views
4K
Graduate Duration of the original CMB radiation
  • LexLuther
  • · Replies 2 ·
Replies
2
Views
3K
Undergrad What is the expansion of the universe
  • The5thElement
  • · Replies 40 ·
2
Replies
40
Views
8K
Undergrad Where is the center of the universe?
  • JediSouth
  • · Replies 233 ·
8
Replies
233
Views
50K
Graduate How is the age of the universe determined through light and cosmic expansion?
  • morningstar
  • · Replies 17 ·
Replies
17
Views
5K
Graduate Could Black Holes Be Cosmic Centrifuges?
  • jsradad
  • · Replies 4 ·
Replies
4
Views
3K
Undergrad Understanding Arrays and Their Role in Converting Light into Data
  • EnSlavingBlair
  • · Replies 1 ·
Replies
1
Views
3K
Graduate Is There a Weak Repulsive Force of Empty Space in the Universe?
  • jadrian
  • · Replies 6 ·
Replies
6
Views
4K
Graduate Applying the uncertinty principle to the big bang
  • DavidFi
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Why do neutrinos escape the sun's core faster than photons?
  • SHISHKABOB
  • · Replies 9 ·
Replies
9
Views
7K
Graduate Galaxy size particle accelerator
  • waterfall
  • · Replies 11 ·
Replies
11
Views
7K
Graduate I've got my FTL boots on (another silly black hole question)
  • Spourk
  • · Replies 24 ·
Replies
24
Views
6K
Undergrad Is the Shapiro time delay effect accepted in science ?
  • guacamolewar
  • · Replies 8 ·
Replies
8
Views
4K
Graduate Can Radar Be Used to Map Distant Planets?
  • Vinni
  • · Replies 7 ·
Replies
7
Views
3K
High School Comet Death Dive Into Sun Seen in Detail for 1st Time
  • Astronuc
  • · Replies 4 ·
Replies
4
Views
5K
Graduate Hydrostatic Equilibrium in an Accretion Disc
  • Jamipat
  • · Replies 9 ·
Replies
9
Views
7K
Undergrad Venus: Slowing Rotation Detected by Venera, Magellan, and Venus Express
  • Dotini
  • · Replies 3 ·
Replies
3
Views
4K
Undergrad How Do You Convert Proton Flux from 1/(cm^2 s sr) to 1/(cm^2 s)?
  • nykon
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Cluster Intergalactic Gas Heating & Cooling Problem
  • Saul
  • · Replies 6 ·
Replies
6
Views
6K
How Big Is the Universe?
  • Ryan_m_b
  • · Replies 21 ·
Replies
21
Views
15K
Undergrad Cepheid Variables in Distant Galaxies
  • Ty1erC
  • · Replies 9 ·
Replies
9
Views
4K
Graduate Questions regarding the Cause of the Universe
  • Rtztgue
  • · Replies 12 ·
Replies
12
Views
3K
Graduate Is the Light Cone a Valid Representation of Light's Behavior?
  • zarmewa
  • · Replies 2 ·
Replies
2
Views
4K
Graduate What is the role of elasticity in space-time according to Sakharov's theory?
  • Fuzzy Logic
  • · Replies 5 ·
Replies
5
Views
5K
High School Is Outer Space Truly Infinite? The Never-Ending Question of Exploration
  • blckndgldfn
  • · Replies 21 ·
Replies
21
Views
12K
Graduate Center of the Universe - Is it Possible?
  • superdave
  • · Replies 62 ·
3
Replies
62
Views
17K
Graduate Units problem in Keplerian equation
  • solarblast
  • · Replies 10 ·
Replies
10
Views
4K
Undergrad Angular Velocity and Spin/Orbital Angular Momentum of Jupiter
  • theKeeblerElf
  • · Replies 2 ·
Replies
2
Views
10K
High School Stationary Satellites: Can We Orbit at the Poles?
  • Grimstone
  • · Replies 11 ·
Replies
11
Views
5K
Undergrad How many kinds of force exist between Planets?
  • oem7110
  • · Replies 17 ·
Replies
17
Views
9K
Undergrad Absolute Magnitude Calculation, How?
  • capcom
  • · Replies 2 ·
Replies
2
Views
5K
Graduate The End of the Universe: A Black Hole Solution?
  • Abidal Sala
  • · Replies 54 ·
2
Replies
54
Views
11K
Graduate Measurement of c using Bradley and 1905 SRT aberration models
  • Ken More
  • · Replies 14 ·
Replies
14
Views
5K
Undergrad Hello and a question about our universe
  • Lensman
  • · Replies 18 ·
Replies
18
Views
5K
Graduate Gauss's Law and Magnetic Reconnection
  • Aurora Austra
  • · Replies 4 ·
Replies
4
Views
3K
Graduate Phase-space structures in plasma turbulence
  • maxime.lesur
  • · Replies 2 ·
Replies
2
Views
4K
Graduate Can a Neutron Star Fragment Become a Meteor and Survive on Earth?
  • waterfall
  • · Replies 14 ·
Replies
14
Views
8K
Graduate Can a Gravity Lens Loop Amplify Distant Objects in Space?
  • Pronoein
  • · Replies 3 ·
Replies
3
Views
3K