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 Are Dark Matter Oscillations Possible Like Atomic Vibrations?
- Bandarigoda
- · Replies 5 ·
Graduate Velocity of receding galaxies. Hubble <-> scale factor
- pensivesnail
- · Replies 5 ·
Graduate Apparent size of objects at cosmological distances
- krater
- · Replies 11 ·
Graduate Why is there an observable universe?
- fsujoseph
- · Replies 12 ·
Graduate Why does the h tensor represent gravity waves?
- the_pulp
- · Replies 7 ·
Graduate What Factors Influence Radiation Production from Cosmic Ray Particles?
- Bendelson
- · Replies 2 ·
Undergrad How do we accurately measure distances in space?
- Starlover
- · Replies 8 ·
Graduate Density perturbations made simple
- resurgance2001
- · Replies 16 ·
Graduate How much matter goes into making black holes?
- revo74
- · Replies 9 ·
Graduate Question on Smolin's theory on Black Holes and new Universes
- Tanelorn
- · Replies 35 ·
Graduate Space Bending: Questions & Answers
- The UPC P
- · Replies 3 ·
Graduate Massive galaxy cluster could upend theory of universe evolut
- Tanelorn
- · Replies 6 ·
Graduate Infinite Universes: Imagining Life Forms & Math Limits
- Marthinus
- · Replies 3 ·
Undergrad Trying to understand black holes
- acesuv
- · Replies 7 ·
Undergrad WMAP or Planck Maps (cartesian projection)
- kcjpro
- · Replies 4 ·
Graduate Did Antimatter Annihilate Matter During the Big Bang?
- ryanuser
- · Replies 41 ·
High School Jupiter gets up in Mercury's business - what happens next?
- CaraKboom
- · Replies 6 ·
Spectacular Spiral May Encircle Milky Way
- CygnusX-1
- · Replies 4 ·
Graduate Is Quantum Cosmology a Viable Path to Understanding the Universe?
- Brian S.
- · Replies 6 ·
Graduate Is this evidence for a space-time continuum?
- student34
- · Replies 7 ·
Graduate Is the universe an adiabatic system?
- Daemon
- · Replies 17 ·
Graduate Binary Star Inclination Angle probability distribution
- Miviato
- · Replies 6 ·
Graduate Depressurization in Space: Estimating Time and Effects of Meteor Penetration
- GTOM
- · Replies 5 ·
Graduate Dennis Overby article on Merging Black Holes
- diogenesNY
- · Replies 1 ·
Mercedes concept "mobile living space"
- phinds
- · Replies 10 ·
Graduate Cosmology: Static Universes and Negative Curvature
- Helios
- · Replies 4 ·
Undergrad A question about Black Holes and their Gravity
- Dean Whaley
- · Replies 13 ·
Graduate Why not an eternal and infinite space?
- Chiclayo guy
- · Replies 19 ·
Graduate Gyrochronology: A Spin-Down Clock for Cool Stars
- jim mcnamara
- · Replies 2 ·
Graduate What Secrets Does the Milky Way's Core Jet Reveal About Galactic Dynamics?
- TEFLing
- · Replies 3 ·
High School Planetary motion as perpetual motion?
- GiantSheeps
- · Replies 3 ·
Graduate Will a Rocket Reach a Distant Galaxy Moving Away Due to Space Expansion?
- arthur0
- · Replies 26 ·
The problem with the "Big Bang" .
- RandyD123
- · Replies 22 ·
How can I find the distance between Epsilon Indi and Tau Ceti?
- Chinspinner
- · Replies 2 ·
Undergrad Reading of planets billions of light years away
- Niaboc67
- · Replies 7 ·
Graduate Planetary orbit disruption by passing stars
- James William
- · Replies 2 ·
Graduate What new theories are being proposed to explain the beginning of the universe?
- H012
- · Replies 4 ·
Graduate How the last days look like just before a tidal lock?
- Czcibor
- · Replies 3 ·
Graduate Forming Strange Quarks in Strange Stars
- LachyP
- · Replies 6 ·
Graduate How Did Quantum Fluctuations Contribute to the Creation of the Multiverse?
- Priyank
- · Replies 27 ·
Graduate Can Life Exist in the Universe or Multiverse After the Big Crunch?
- Hawking14
- · Replies 9 ·
Undergrad Converting/Creating Coordinate Systems for Other Planets?
- Raymond_
- · Replies 5 ·
Graduate Can someone check my work for this problem I thought of?
- zeromodz
- · Replies 3 ·
Graduate What is the value of k in the Moon's orbital precession?
- chuligan
- · Replies 6 ·
High School Best way to see Andromeda galaxy
- GiantSheeps
- · Replies 6 ·
Graduate A Brief History Of Time (Stephen Hawking) FAQs -- Big Bang & Multiverse question
- Priyank
- · Replies 37 ·
Undergrad Do tidal forces slowly make orbits more circular?
- Nathanael
- · Replies 5 ·
Graduate Baryon acoustic oscillations and sound horizon
- Denver Dang
- · Replies 1 ·
High School How big does a mass have to be before gravity
- RandyD123
- · Replies 4 ·
Graduate Boltzmann equation for the early Universe
- Denver Dang
- · Replies 10 ·
Graduate Time - How Long was the first second?
- TonyLondon
- · Replies 5 ·
Undergrad Discover the Spectacular Sky Color on a K4.5V Main Sequence Star"
- Chinspinner
- · Replies 7 ·
Graduate Mass Inflation Instability in Kerr and Reisnerr black holes.
- Lamdbaenergy
- · Replies 4 ·
Graduate How Do You Calculate the Correct Launch Window for an Inclined Orbit Around Io?
- MattRob
- · Replies 3 ·
Undergrad Why are there galaxies everywhere we look?
- Rayven
- · Replies 17 ·
Graduate Remind me why FLRW curvature can't switch between cases
- Matterwave
- · Replies 5 ·
Undergrad Simulating Planetary Collisions: Outcomes & Results
- Elite Jacob
- · Replies 1 ·
High School Can Small Bangs Create Mini Universes?
- Muhib
- · Replies 4 ·
Graduate Could Dark Matter be composed of neutrons?
- TerranIV
- · Replies 5 ·
Graduate Calculate Sun and Moon Astronomical Parameters with VSOP87 Accuracy
- Philosophaie
- · Replies 3 ·
Graduate On the mathematics of interstellar colonization
- Emspak
- · Replies 7 ·
Undergrad Can i create a star from Jupiter?
- D.Biswas
- · Replies 28 ·
High School Why Equator only exists for a rotating body like Earth?
- avito009
- · Replies 17 ·
Graduate Can indirect searches for DM provide insights into candidate particles?
- ChrisVer
- · Replies 7 ·
Graduate Pandora (Borderlands): Is this planet possible?
- LuckyStampede
- · Replies 14 ·
Graduate An article on a possible alternative to dark energy
- Tanelorn
- · Replies 2 ·
High School Revolution of Planets: Rotation & Revolving Around Stars
- saket agrawal
- · Replies 3 ·
Graduate Where did Schwarzschild get his information for his black hole model?
- spacecadet11
- · Replies 19 ·
Graduate Can Inflation Avoid Selfreproduction?
- marcus
- · Replies 5 ·
Graduate Steinhardt 16 Dec on inflation (+alts) and spirited debate
- marcus
- · Replies 3 ·
Graduate How can superconductors be used to protect spaceships from radiation in space?
- John d Marano
- · Replies 5 ·
Graduate How can we sure that physical laws are always the same in al
- Garrulo
- · Replies 6 ·
Graduate Neutron Star Collapse: Q&A on Physics and Observation
- anorlunda
- · Replies 9 ·
Graduate Creation of spinning neutron stars and pulsars
- Denver Dang
- · Replies 5 ·
Graduate Gravitational Interferometer and Kalman
- Enthalpy
- · Replies 9 ·
Graduate Planets collapsing into black holes?
- Lamdbaenergy
- · Replies 4 ·
Graduate Inside a black hole, looking out
- I knows
- · Replies 16 ·
High School Book recommendation on Binary systems
- ChrisVer
- · Replies 1 ·
Graduate Cosmic rest frame, comoving distance, and proper distance
- resurgance2001
- · Replies 12 ·
Graduate New Planck mission results, Ferrara December 1-5
- marcus
- · Replies 4 ·
Undergrad Calculating Luminosity from Brightness: Where Did I Go Wrong?
- bearsfan654
- · Replies 2 ·
Where Can You Explore the Universe from Planck Scale to Cosmic Scale?
- Ponderer
- · Replies 1 ·
Graduate Expanding Universe: Is Kinetic Energy Behind Acceleration?
- J7H18
- · Replies 8 ·
High School The 15 Million Degree Pinhead: The Sun's Core Materialized on Earth
- webboffin
- · Replies 18 ·
Graduate Percentage of Matter, Dark Matter and Baryonic Matter
- P_Ravensorow
- · Replies 9 ·
Graduate Radical new take on *uni*verse questions by Smolin, could be important
- marcus
- · Replies 237 ·
High School Discovering Earth's View from Epsilon Indi: Answers by Chinspinner
- Chinspinner
- · Replies 10 ·
High School What are the atoms floating in space
- Niaboc67
- · Replies 1 ·
Graduate Three Important Questions (about black holes and the Big Bang)
- P_Ravensorow
- · Replies 11 ·
Do Some Stars Possess A Particular Name?
- TheBiologist
- · Replies 9 ·
Graduate Oberth Maneuvers Using Sun, Jupiter & Saturn: Formulations & Assumptions
- James Essig
- · Replies 19 ·
Are there any caves on the Moon?
- !Jon Snow!
- · Replies 18 ·
Graduate Sign swapping - spacelike intervals
- Svendsen
- · Replies 3 ·
Undergrad Measuring the Movement of the Stars
- ScientificMind
- · Replies 3 ·
Undergrad How to Identify Polar Day and Night Seasons?
- simurq
- · Replies 10 ·
Graduate Question about gravity and the shell theorem
- mrspeedybob
- · Replies 18 ·
High School Direction in Space: Do We Launch Straight Up from the North and South Poles?
- elusiveshame
- · Replies 3 ·
High School What is Stellar Flux and How Does it Affect Solar Wind?
- EpicAll Rounder
- · Replies 3 ·
Has Anyone Played Space Engineers?
- Greg Bernhardt
- · Replies 1 ·
Graduate Do quantum fluctuation particles create gravitational effect?
- BernieM
- · Replies 11 ·