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 Role of triatomic H ion (H3+) in early star formation
- marcus
- · Replies 1 ·
Graduate Which fraction of the observed CMBR signal is due to some foreground contaminant
- Tanelorn
- · Replies 20 ·
Graduate Spatial and temporal variation of alpha?
- asimov42
- · Replies 1 ·
How do astrophysicists balance truth and creativity
- cre8flow
- · Replies 2 ·
High School Does light stop and turn back when reflected or interact with the surface?
- StevenJParkes
- · Replies 2 ·
Undergrad How is the big bang related to the general theory of relativity?
- JJHK
- · Replies 3 ·
Graduate Can We Adjust Natural Constants to Obtain Stable Atoms in Other 'Multiverses'?
- Aidyan
- · Replies 13 ·
Graduate Can Baryon Acoustic Oscillation Accurately Measure the Universe's Expansion?
- bill alsept
- · Replies 8 ·
Graduate The 'nothingness' of the vacuum.
- Naty1
- · Replies 1 ·
Graduate Does iron really kill fusion in stars?
- ldc3
- · Replies 5 ·
Undergrad Follow-up and pipeline: definitions
- RHK
- · Replies 4 ·
Graduate Hawking radiation and cosmic microwave background radiation
- Orion1
- · Replies 5 ·
Graduate Obstacles to observing the cosmic neutrino background
- bobsmith76
- · Replies 1 ·
Graduate Physical space properties questions
- neginf
- · Replies 8 ·
High School Naked eye view from intergalactic space
- Frankiewicz
- · Replies 4 ·
Graduate Does not receeding of galaxies decrease entropy
- dpa
- · Replies 1 ·
High School Why Can We See Venus from Michigan?
- dmayers94
- · Replies 38 ·
Graduate Is our universe a geodesically complete manifold?
- TrickyDicky
- · Replies 20 ·
Graduate What is the issue with the concept of a center in the expanding universe?
- Quinzio
- · Replies 16 ·
Undergrad Why doesn't universe expansion affect the space between atoms?
- Skeetss
- · Replies 28 ·
Undergrad Why do orbits become more eccentric when changing speed?
- nothingbetter
- · Replies 1 ·
Graduate What can spectroscopy of this distant galaxy reveal about the universe at z~10?
- Chronos
- · Replies 5 ·
Graduate Why doesn't light interact with dark matter?
- uniquestring
- · Replies 21 ·
Graduate ISIS image subtraction program; trouble running
- akf1001
- · Replies 2 ·
High School What can i see with this? (astronomy on a budget)
- jehan60188
- · Replies 11 ·
Graduate Spacetime: continuous or quantized?
- johann1301
- · Replies 1 ·
Can Satellite Watching Become an Addictive Hobby?
- DaveC426913
- · Replies 7 ·
Graduate Highest expansion rate during inflation.
- MTd2
- · Replies 8 ·
Undergrad Can Stars Become Black Holes Without Going Supernova?
- Routaran
- · Replies 6 ·
Graduate Particle creation in an accelerating Universe?
- johne1618
- · Replies 22 ·
Graduate Can Non-Conservation of Momentum Be Explained by an Asymmetry of Space?
- azabak
- · Replies 2 ·
Graduate What do the multiple moments represent in the WMAP power spectrum?
- ditzycloud
- · Replies 10 ·
Graduate Newtonian cosmology vs relativistic cosmology
- houhou.trad
- · Replies 1 ·
Undergrad Energy of photons and the red shift
- davidmroper
- · Replies 2 ·
Graduate I have some somewhat detailed questions about inflation, curvature, and entropy
- ocsis2
- · Replies 12 ·
High School Can you see stars from the surface of a ringed planet?
- TkyToaster
- · Replies 3 ·
High School Tilt of the earth's axis. Why does it change?
- McLaren Rulez
- · Replies 5 ·
Graduate What is outside the boundary of the expanding universe?
- beatlemaniacj
- · Replies 1 ·
Graduate Transient crater diameter formula from Impact:Earth! paper
- John Clayborn
- · Replies 2 ·
Graduate Spectral Energy Distribution of T Tauri stars
- Jamipat
- · Replies 1 ·
High School Any idea on how to identify a celestial event?
- murdochandi
- · Replies 5 ·
High School Wow signal from 1977 and searches for its origin
- AlexSETI
- · Replies 10 ·
Graduate How Do We Distinguish Red Shift Changes Over Time in Distant Objects?
- kinman
- · Replies 5 ·
Graduate Does the Universe have a Boundary ?
- Aquafire
- · Replies 33 ·
Undergrad Convective motion and Stellar jitter
- Jamipat
- · Replies 1 ·
Graduate What about gravity's relativity?
- C. Bernard
- · Replies 18 ·
Graduate Why doesn't anyone try to locate the universe's center?
- thetexan
- · Replies 127 ·
Graduate Is the total energy of each particle constant in an expanding universe?
- johne1618
- · Replies 2 ·
High School Why Can't I See the Milky Way in the City?
- joeyjo100
- · Replies 16 ·
Undergrad Fund ESA's Billion-Plus Euro Project for 2020s Launch
- Ryan_m_b
- · Replies 20 ·
Graduate What triggered the Big Bang singularity to expand?
- curiouschris
- · Replies 27 ·
Graduate Dark Energy Changing Into Dark Matter.
- hankaaron
- · Replies 9 ·
Graduate Could dark antimatter explain the baryon asymmetry?
- WhiteKnights
- · Replies 47 ·
Graduate The Cyclic Model: Multidimenstional Membranes? Where do these come from?
- Physgeek123
- · Replies 2 ·
Graduate Do antineutrinos exist as fundamental particles?
- Physgeek123
- · Replies 1 ·
Undergrad Plank curves and emission/absorbtion spectra
- goldsax
- · Replies 5 ·
Undergrad Eccentricity of orbits and gravitational energy
- sk9
- · Replies 9 ·
Graduate Mechanism for matter creation in an expanding Universe?
- johne1618
- · Replies 3 ·
Graduate Question on how stars are located
- jackcr
- · Replies 9 ·
Undergrad What were the biggest physics discoveries between 1980 and 2012?
- Opus_723
- · Replies 16 ·
Graduate Can Simple Mass Accretion Turn a Neutron Star Into a Black Hole?
- tvscientist
- · Replies 12 ·
High School How does gravity work and why do massive objects bend light?
- Nash Su
- · Replies 3 ·
Graduate What happens to fermions when a neutron star collapses to a black hole?
- edearl
- · Replies 58 ·
High School Going to Mars as a private company - How hard would it be?
- Lightingbird
- · Replies 3 ·
Undergrad What would happen if the sun was hit by a gamma ray burst?
- Nash Su
- · Replies 1 ·
Graduate Why do cosmologists accept multiverses but reject God?
- Homesick345
- · Replies 14 ·
Graduate Looking for an introduction to eternal inflation
- IRobot
- · Replies 2 ·
Graduate Spaghettification electromagnetism
- VeronicaS
- · Replies 7 ·
Undergrad Why Does Pi Appear in So Many Scientific Equations?
- goldsax
- · Replies 5 ·
Graduate The Sun and Hydrogen into Helium Fussion?
- parallaxoz
- · Replies 4 ·
Graduate Can light be affected by other masses in deep space?
- dan4blues
- · Replies 1 ·
Graduate How to Calculate Intensity in Airy Disk from a Point Source?
- Drakkith
- · Replies 2 ·
Graduate How to accrete neutral gas after the reionization of the universe?
- philherna
- · Replies 6 ·
Undergrad Do objects really take up space?
- taurusaud
- · Replies 11 ·
Graduate The Impact of Multiple Universes on Big Bangs
- space_buster
- · Replies 9 ·
Stargazing How many percent does the kepler telescope investigate of the sky?
- Gliese123
- · Replies 2 ·
Undergrad What is our perpective, where did it start, and why can we see it?
- Dokshifty
- · Replies 9 ·
Undergrad Is the Universe Finite or Infinite in Space?
- goodoldrebel
- · Replies 33 ·
Graduate Is a non-infinite universe the same as a closed universe?
- sea100
- · Replies 16 ·
Graduate How do we account for all the elements in the Universe?
- CramerTV
- · Replies 3 ·
Graduate How Do We Know Gas Contributes to Galactic Gravity?
- adamq1
- · Replies 9 ·
Graduate How to calculate perihelion precession
- Bjarne
- · Replies 4 ·
High School Can Earth sustain much bigger object with an infinite weight?
- Munyit
- · Replies 22 ·
Undergrad Different types of interstellar dust and their origins
- skydivephil
- · Replies 1 ·
Graduate Angular Resolution: Best Possible Observing Distance for Stars
- intervoxel
- · Replies 3 ·
Graduate Do Gravitational Waves Scatter and Increase Entropy?
- pawprint
- · Replies 7 ·
Graduate Rate of universe expansion question
- AdamLin
- · Replies 10 ·
Graduate If Betelgeuse Went Supernova Soon
- Drakkith
- · Replies 27 ·
Undergrad Where do the heavier elements come from, such as those found in planets?
- Kaldanis
- · Replies 5 ·
Graduate Could dark matter have gamma-ray absorption lines?
- johne1618
- · Replies 3 ·
High School How quickly does a star's supernova become apparent to the naked eye?
- Ender55
- · Replies 4 ·
Graduate Small scale effects of expansion, and 'bound' objects
- zhermes
- · Replies 16 ·
Graduate Short GRB's: Neutron Star Merger Evidence?
- skydivephil
- · Replies 3 ·
Graduate How do we define 'Earth like planet'
- YummyFur
- · Replies 20 ·
High School Why does the moon appear sideways in Michigan?
- Tomato
- · Replies 28 ·
Graduate What might happen if an object struck and replaced Luna
- highjustice
- · Replies 1 ·
Graduate Dark Energy, Dark Matter, and Empty Space
- soyounoat
- · Replies 8 ·
Graduate Dark matter research paper: WIMPs, neutralino theory, and DRIFT-II detection
- Bhumble
- · Replies 5 ·
Graduate Does Space Expand? What Do You Think?
- Wallace
- · Replies 176 ·
Undergrad Is the Universe’s Accelerating Expansion Theoretical or Observable?
- gttjohn
- · Replies 20 ·