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 Solar system's path in the Milky Way galaxy
- mathman
- · Replies 19 ·
Undergrad Information for black hole region in surface surrounding it
- arlesterc
- · Replies 4 ·
Undergrad Black hole - between horizon and singularity
- arlesterc
- · Replies 5 ·
Undergrad Black hole - event horizon and Hawking radiation
- arlesterc
- · Replies 4 ·
Undergrad What is the Cosmic Microwave Background and how can we observe it today?
- Mr Davis 97
- · Replies 7 ·
Graduate What is the Concept and Calculation of Geodesic Deviation in Physics?
- Greg Bernhardt
- · Replies 1 ·
Undergrad Forming Asteroids: Dust, Gas & Vacuum Mysteries
- Jakko
- · Replies 15 ·
Undergrad Question on the particles that formed the Earth.
- Damian79
- · Replies 16 ·
Undergrad Infinite Regress: Cosmologists' Answer to the Dilemma
- momo666
- · Replies 22 ·
High School Measurements on the entire universe
- Adel Makram
- · Replies 15 ·
High School Does gravity cause time dilation?
- Chompers
- · Replies 17 ·
High School Enlarging Planetary Orbits: Evidence of the Solar System's Evolution?
- Sanborn Chase
- · Replies 5 ·
Undergrad Reference point of geocentric lunar latitude?
- jwberck
- · Replies 6 ·
High School Star trails and the Earth's movemement
- hamischism
- · Replies 43 ·
High School Is Inertia Tied to the Stars According to Mach's Principle?
- Torog
- · Replies 67 ·
Undergrad What would happen if I were 1 ly from a black hole merger?
- Pete Muller
- · Replies 8 ·
Undergrad Why Does Physical Space Have 3 Dimensions?
- Tom Mcfarland
- · Replies 2 ·
Undergrad What is the significance of systematic redshift and Mg II in astrophysics?
- shadishacker
- · Replies 10 ·
Undergrad Why Doesn't the 11-Year Solar Cycle Affect the Sun's Magnetic Field?
- Frank Einstein
- · Replies 4 ·
High School Is the concept of a multiverse just science fiction or a scientific possibility?
- mohau tshekoeng
- · Replies 19 ·
Undergrad Why do galaxy and galaxy clusters look so colorful?
- Riotto
- · Replies 14 ·
High School Would All Observers See a Warp Drive Spaceship at Constant Speed?
- Negativebeef
- · Replies 2 ·
Undergrad Time Scale -- Does Time have uniform Scale?
- STAR GIRL
- · Replies 3 ·
Insights What Is the Cosmic Background Radiation?
- bapowell
- · Replies 3 ·
Undergrad Is there a consensus about the nature of dark matter?
- MichaelMo
- · Replies 27 ·
High School Nothing, something and the Universe
- kolo12
- · Replies 5 ·
Undergrad Problem interpreting a Distance-Redshift Plot
- JohnnyGui
- · Replies 55 ·
Undergrad Dark matter and black hole interaction
- infinitebubble
- · Replies 40 ·
Undergrad Neutrino flavour eigenstates and expansion of the universe
- Carlos L. Janer
- · Replies 59 ·
High School Will Michigan Ever Get An Eclipse
- Parker Hame
- · Replies 10 ·
Undergrad Explain about the information lost through black hole
- Adinath
- · Replies 1 ·
Undergrad Comoving distance and redshift relationship derivation
- DoobleD
- · Replies 6 ·
Undergrad Could the Light Crowd in Orbiting Black Holes Over Billions of Years?
- zuz
- · Replies 4 ·
Undergrad How stuff in empty space cools down?
- Quantum Velocity
- · Replies 18 ·
High School Question About The Stars -- Can they have died before we see their light?
- TheQuestionGuy14
- · Replies 5 ·
Undergrad Experimental bound on the scalar spectral index
- shinobi20
- · Replies 4 ·
Undergrad Photon Sphere and time travel around a Black Hole?
- infinitebubble
- · Replies 6 ·
High School Could Our Location in a Supervoid Alter the Hubble and Acceleration Parameters?
- Carlos L. Janer
- · Replies 1 ·
Undergrad Large wavelength and "fitting into" small spaces
- snate
- · Replies 2 ·
Undergrad Why Aren't Galaxies Formed After the Big Bang Referred to as Being Further Away?
- jwcole04
- · Replies 11 ·
Stargazing Dragon + Falcon 9 visible from Western Europe Saturday
- mfb
- · Replies 4 ·
High School Why is the low entropic state of the early universe a puzzle
- bland
- · Replies 10 ·
High School Earth-Sun Lagrange Points Distance Query
- Dr Wu
- · Replies 3 ·
Graduate Do Friedmann-Lemaitre Equations Determine the Shape and Fate of the Universe?
- Mikeal
- · Replies 1 ·
Undergrad Supernova - What would you see if watching one from close by?
- BetaZeta2016
- · Replies 9 ·
High School Did we just discover the Milky Way is in middle of nowhere?
- Tanelorn
- · Replies 11 ·
High School General Relativity Aces a Test at Supermassive Black Hole
- CygnusX-1
- · Replies 1 ·
Undergrad Possible retrocausal events and time paradoxes
- Trollfaz
- · Replies 1 ·
High School Hubble's constant and Minkowski spacetime
- Chris Miller
- · Replies 10 ·
Undergrad How Black Holes Form: Neutron Collapse & Supernovae
- Arman777
- · Replies 9 ·
High School The Hottest Giant Planet Yet: 7800 degrees F.
- CygnusX-1
- · Replies 4 ·
Undergrad Red shift and the maths for gravity
- trevor white
- · Replies 4 ·
Graduate Some questions about the PFSS model on IMF
- Tianluo_Qi
- · Replies 7 ·
Graduate How To Do Fisher Forecasting For Constraining Parameters
- xdrgnh
- · Replies 6 ·
High School Relationship Between Density and the Hubble parameter
- mindarson
- · Replies 5 ·
Undergrad Why use velocity dispersion in Faber Jackson relation
- Ron19932017
- · Replies 1 ·
Undergrad Are Aliens Listening? Evidence for Intelligent Life in Space
- Schnellmann
- · Replies 43 ·
High School Our solar system and its fellows
- Solomei
- · Replies 9 ·
High School Understanding Re-entry Perturbations After Inflation
- Discman
- · Replies 6 ·
Undergrad I cannot figure out what I saw in this picture, help me
- Armando Valle
- · Replies 22 ·
High School What is the atmospheric pressure on Pluto and how can it sustain gases?
- John Dalton
- · Replies 6 ·
Undergrad Direct collapse to black hole without supernova?
- sshai45
- · Replies 8 ·
High School What Drives the Accelerating Expansion of Space?
- John M
- · Replies 5 ·
High School Singularities forming universes?
- Thomas Clark
- · Replies 18 ·
Undergrad Why does physical space have to be three-dimensional?
- Carlos L. Janer
- · Replies 12 ·
Undergrad Does the Planck length expand in a FRW universe?
- jcap
- · Replies 1 ·
Undergrad What are the alternative theories for the end of the expanding universe?
- durant35
- · Replies 37 ·
High School Map of Solar System: See How Far Away Planets Are!
- jack action
- · Replies 12 ·
Undergrad About the Entropy of the Universe
- STAR GIRL
- · Replies 3 ·
Undergrad New Gravitational Wave Detection question
- thetexan
- · Replies 15 ·
High School Where Did the Energy Go in Light Waves When the Universe Expanded?
- Daniel Petka
- · Replies 4 ·
Undergrad Questions regarding dark matter dynamics
- Buzz Bloom
- · Replies 65 ·
Pictures of extraterrestrial space
- wolram
- · Replies 6 ·
Undergrad Life permitting ranges for fine tuning constants
- Beans56
- · Replies 2 ·
High School How do we know the size of the universe?
- Lunct
- · Replies 6 ·
High School Can Primordial Black Holes explain Galaxy formations
- wolram
- · Replies 2 ·
Graduate What Are the Stationarity and Limitations of the Standard Accretion Disk Model?
- AstroLove
- · Replies 1 ·
Graduate What Is a 'Black Hole' & What Does It Mean for Particles?
- Burt
- · Replies 3 ·
Undergrad What is the lower bound constraint for G in terms of anthropic principles?
- windy miller
- · Replies 13 ·
Undergrad What happens to the information entering a Black hole?
- STAR GIRL
- · Replies 4 ·
High School Does the expansion of space influence the passage of time across the universe?
- Vincent Neave
- · Replies 27 ·
Stargazing Optimizing Polariscopic Alignment for Equatorial Mounts: Tips and Tricks
- sophiecentaur
- · Replies 2 ·
Undergrad Where to find full core-to-surface profiles of stars?
- solo_legend
- · Replies 1 ·
Insights Interview with Astronomer Pamela Gay - Comments
- Greg Bernhardt
- · Replies 2 ·
High School First Direct Measurement of Brown Dwarf Mass Limit: 6.7% Sun
- CygnusX-1
- · Replies 26 ·
Graduate Is the Universe Flat Without Volume?
- ddjj77
- · Replies 7 ·
High School How Does Earth's Water Compare to Potential Ocean and Desert Planets?
- lpetrich
- · Replies 3 ·
Graduate Calculating the power spectra of scalar perturbation
- shinobi20
- · Replies 55 ·
Graduate Tension between recent dark matter results and Lux-Xenon?
- jimgraber
- · Replies 1 ·
Graduate New ideas on the mechanism of solar CME's
- davenn
- · Replies 7 ·
High School A Question about tiny tiny stars, and radiating heat
- Chrono_13
- · Replies 13 ·
Undergrad Can an Atom Become a Black Hole?
- Blop
- · Replies 5 ·
High School Does the geometry of space really change with gravity?
- STAR GIRL
- · Replies 8 ·
Undergrad Interesting controversy about inflation models of the universe
- kodama
- · Replies 17 ·
Undergrad Centre of mass of the observable universe
- Richmonder
- · Replies 13 ·
Undergrad Comoving mass density leads to linear cosmology?
- jcap
- · Replies 3 ·
High School Cepheid Variable Stars and Space-Time Warping
- Uzbar Zibil Tarag
- · Replies 7 ·
Undergrad Understanding the Formation of Stars: A Look at Gravity, Gas Pressure, and Heat
- Justonequestion
- · Replies 27 ·
High School How much effect does the moon's gravity/size have on Mars?
- RICKYtan
- · Replies 4 ·
Graduate Variation of Hubble constant in cosmological time
- spaghetti3451
- · Replies 9 ·