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
Undergrad What Does a Redshift Calculation of 2.5 Mean?
- eggman100
- · Replies 8 ·
Graduate What are the jets from a feeding blackhole made of?
- Lino
- · Replies 4 ·
Undergrad Length of the life of a red supergiant.
- crawleen
- · Replies 4 ·
Undergrad Where does the universe's energy go in heat death?
- azizlwl
- · Replies 12 ·
Undergrad Does 4th Dimension Space Really Exist Beyond Our Perception?
- jd12345
- · Replies 7 ·
High School Do objects within a galaxy rotate in the same direction as the galxy itself?
- Lino
- · Replies 5 ·
High School How does gravity affect stars orbiting in a galaxy?
- Dark Universe
- · Replies 13 ·
Graduate How Does Chaplygin Gas Unify Dark Energy and Dark Matter?
- kptsilva
- · Replies 4 ·
High School Calculating how long ago light was emitted from a star?
- crawleen
- · Replies 8 ·
Graduate Revamping general concept and cosmological principle
- hitchiker
- · Replies 18 ·
Graduate What the Hubble constant must be set to if Univ is flat
- robertjford80
- · Replies 8 ·
High School Possible matter being Created/Destroyed?
- Samuel99
- · Replies 89 ·
Undergrad Does space expand from big bang momentum or does it grow outward from a point?
- bawchicawawa
- · Replies 3 ·
Graduate Evidence of Dark Matter? 130-GeV gamma rays from near our galaxy's core
- lpetrich
- · Replies 7 ·
Undergrad Distance of planets from stars and revolution
- dRyW
- · Replies 20 ·
Graduate Real-Space vs Redshift-Space Correlation Functions
- srivatsan
- · Replies 3 ·
Undergrad Does Time Flow Differently in Distant Galaxies Due to Speed?
- Wykydtron
- · Replies 3 ·
Graduate Do cyclic models of the universe
- _heretic
- · Replies 3 ·
Undergrad Could the Milky Way's Dense Oort Cloud Mean a Richer Galactic Landscape?
- Dark Universe
- · Replies 40 ·
Graduate Time Space Physics: 3 Questions for Physics Community
- abbeynewton
- · Replies 3 ·
Undergrad The atmosphere of titan and mars
- robertjford80
- · Replies 5 ·
Graduate Blackbody Radiation: Solving Introduction to Cosmology Eq. #25
- 4everphysics
- · Replies 4 ·
Graduate Why does light from distant sources take longer to reach us over time?
- 4everphysics
- · Replies 6 ·
Graduate Is the theory that black holes contain universes mainstream or fringe?
- ThinkToday
- · Replies 17 ·
Graduate Where's the flaw in my objection to cosmic acceleration?
- gork
- · Replies 88 ·
Graduate Why can different physical theories use the same mathematics?
- wilha
- · Replies 20 ·
Graduate Dark Matter: Light or Misunderstood?
- excession
- · Replies 5 ·
Graduate By what equation do physicists use to measure the time before the CMB
- robertjford80
- · Replies 2 ·
Graduate How is Cosmological Proper Distance Defined and Interpreted in Physics?
- Ich
- · Replies 22 ·
High School I would like to learn more about cosmology
- Chibbz
- · Replies 7 ·
Undergrad Is Moon so crucial for axial tilt stability of the planet?
- Tiger Blood
- · Replies 15 ·
Graduate Is it possible that speed of a gravitational waves are greater than c?
- Ravi Mandavi
- · Replies 52 ·
Graduate Question regarding dark energy and accelerated expansion
- rrosenthal
- · Replies 4 ·
Graduate Can supernova shockwaves accelerate objects like an ion drive?
- Kruzeman
- · Replies 6 ·
Graduate Is Dark Energy the Same as Vacuum Energy?
- Don'tKnowMuch
- · Replies 2 ·
Whats is volume of mass at the centre of the sun
- karen_lorr
- · Replies 2 ·
Graduate Black Holes as 2 Dimensional Objects
- Vastin
- · Replies 32 ·
Graduate How can they rule out a closed universe?
- RagingHadron
- · Replies 17 ·
High School We're no longer biggest star system
- DaveC426913
- · Replies 23 ·
High School Do we know whats at the center of galaxies yet?
- Topher925
- · Replies 3 ·
Undergrad Did Olympus Mons Cause Mars' Lack of Electromagnetic Field?
- dizzolve
- · Replies 1 ·
Graduate What would it take to terraform Pluto and Charon?
- Dark Universe
- · Replies 21 ·
Graduate How new are carbon chem and rocky planets?
- marcus
- · Replies 5 ·
Graduate We live at the beginning of the time when life is possible
- robertjford80
- · Replies 32 ·
Graduate Star Cluster Within Self Schwarzschild Radius
- chill_factor
- · Replies 5 ·
Graduate Black holes and an argument I'm in
- reaped
- · Replies 9 ·
Graduate Does dark matter have to be one particle
- KeplerJunior
- · Replies 8 ·
Graduate Why does inflation lead to a smaller universe at 380000 years?
- Thorslog
- · Replies 8 ·
Graduate How big do we need for comsological principle?
- skydivephil
- · Replies 3 ·
Graduate Is Dark Matter Really Missing in Our Galactic Neighborhood?
- Chronos
- · Replies 9 ·
Graduate How do quantum fluctuations create structure from a homogenous Big Bang?
- QuestionMarks
- · Replies 15 ·
High School Can the Venus transit be viewed with the naked eye
- dalcde
- · Replies 4 ·
Undergrad What Does the Solar Spectrum Look Like at Night?
- ANarwhal
- · Replies 5 ·
Undergrad Is the Universe Really Expanding Without a Center?
- azizlwl
- · Replies 10 ·
Graduate On Introducing a Nano-Planet into an Existing Solar System
- jackpelham
- · Replies 3 ·
Graduate Galaxies moving faster than the speed of light?
- AustinJones
- · Replies 12 ·
High School Why isn't a ring-shaped universe model discussed as a big bang alternative?
- dthomass
- · Replies 12 ·
High School If everywhere is the center, are we back at the center of the universe?
- geordief
- · Replies 13 ·
Graduate Subtracting the proper motion resulting from movement of the Sun
- rawen
- · Replies 1 ·
Graduate Black hole acreting binary -magnetic fields
- skydivephil
- · Replies 5 ·
Graduate Why The Gamma Ray Burst doesn't explode into all the directions?
- arabianights
- · Replies 5 ·
Graduate Hubble's Law and it's relation to Quantum Mechanics
- commodianus
- · Replies 2 ·
Undergrad What evidence shows the universe expands like raisin bread, not from a central point?
- AustinJones
- · Replies 12 ·
Undergrad Can a spinning magnet in space generate electricity indefinitely?
- grimofdoom
- · Replies 12 ·
Undergrad Is the process of fusion really enough to keep stars from imploding?
- david findley
- · Replies 5 ·
Graduate Density functions for solar core, radiative and convective zones
- Orion1
- · Replies 23 ·
Undergrad What happens to shrapnel if a hand grenade explodes in solar orbit?
- jackpelham
- · Replies 19 ·
Graduate What exactly is a quantum fluctuation
- robertjford80
- · Replies 7 ·
Graduate Lawrence Krauss: Observing a Baby Universe's Expansion
- Routaran
- · Replies 3 ·
Graduate Science bits of Hawking's documentary
- twofish-quant
- · Replies 16 ·
Graduate Q and U parameters for polarization
- Anne-Sylvie
- · Replies 3 ·
Graduate Hawking's 'Did a creator create the Universe' documentary on quantum creation
- Tanelorn
- · Replies 45 ·
Graduate Series Expansion Newton Dark Matter
- jensel
- · Replies 1 ·
Graduate Vc versus Vcc. Meteor Calculations
- solarblast
- · Replies 1 ·
Undergrad Did the Milky Way Have a Galactic Collision in the Past?
- Aidyan
- · Replies 9 ·
Graduate Why is the CMB power spectrum often plotted as l(l+1) C_l and not only C_L ?
- Anne-Sylvie
- · Replies 1 ·
Graduate Unifying Dark Energy & Dark Matter: Investigating the Chaplygin Gas
- kptsilva
- · Replies 2 ·
Graduate Quantum Mechanics and Thermodynamics Explain Us
- RAuld
- · Replies 6 ·
High School Percent area of the universe is galaxy?
- sketchd2
- · Replies 3 ·
Undergrad Hubble Law - recession velcoity?
- jsmith613
- · Replies 9 ·
Undergrad Problems with the Big Bang: is the article legitimate?
- iner7ia
- · Replies 9 ·
Graduate Half Question/Half-Challenge: Dimensions of of the Earth-Moon System
- Vorde
- · Replies 3 ·
High School Why is gravity zero at Earth's center if mass surrounds you equally?
- bigalzz
- · Replies 2 ·
Critique of balloon analogy explanations for expanding spacetime
- phinds
- · Replies 64 ·
High School Gravity a question from a bus driver:-)
- bigalzz
- · Replies 24 ·
Graduate Why Measure Velocity Dispersion in Elliptical Galaxies?
- Tomer
- · Replies 3 ·
Graduate Does the Universe Have a Circular Structure?
- geordief
- · Replies 11 ·
Graduate Questions about Universe expansion
- AlSo
- · Replies 6 ·
Weird Face In the Pillars of Creation?
- Samuel99
- · Replies 16 ·
High School Earth's magnetosphere historical data
- DanSolo
- · Replies 2 ·
Graduate Is the number of atoms the same as during the Big Bang
- robertjford80
- · Replies 5 ·
High School Did the heaviest elements come from other galaxys
- jackrobinson9
- · Replies 14 ·
Undergrad Dark Matter, any new news about it?
- Max Born
- · Replies 5 ·
High School How much would a laser spread out in space?
- Albertgauss
- · Replies 4 ·
Undergrad Which is Brighter: Gamma Ray Bursters or Quasars?
- aguycalledwil
- · Replies 4 ·
Undergrad Our weight if the earth spins faster
- PhysicoRaj
- · Replies 11 ·
Graduate Nuetron Star Binary: Acretion Process Differences
- skydivephil
- · Replies 1 ·
Graduate Will a Knotted Flux Tube in a Plasma Tend to Move?
- ImaLooser
- · Replies 3 ·
High School Why do planets and stars orbit in the same plane?
- drme1981
- · Replies 2 ·
Graduate Solar wind interaction with Earth's magnetic field
- jubby
- · Replies 3 ·