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 Could Extraterrestrial Life Exist in Unique Environments Like Titan?
- jonegil
- · Replies 31 ·
Graduate X-ray background/peculiar velocities and the Big Bang
- xratx
- · Replies 2 ·
Graduate Physical basis for dark energy-I think Bojo found it
- marcus
- · Replies 12 ·
Undergrad Unveiling the Mystery of Light: How Does it Move?
- madphysics
- · Replies 30 ·
Undergrad Catastrophic Nova: Definition & Explanation
- ameriti$h
- · Replies 3 ·
Graduate Condition for inflation presented by Liddle
- Magister
- · Replies 3 ·
High School Video Recommendations for Black Holes & other space-related phenomena
- NDHurdler
- · Replies 5 ·
Graduate Oldest Black Hole - Age of the Universe Explained
- bassplayer142
- · Replies 16 ·
Graduate Giant Solar Laser: Harnessing Energy from the Sun
- Ruslan_Sharipov
- · Replies 3 ·
Undergrad Star Collapse: Why Not in Early Stages?
- bassplayer142
- · Replies 2 ·
Undergrad Calculate Star Radii: Mass, Luminosity & Temp
- Magister
- · Replies 7 ·
High School Uncovering the Mystery of Dark Matter: A Beginner's Guide
- pixel01
- · Replies 4 ·
High School Does the Name of Mars Reflect its Ancient Oceans?
- baywax
- · Replies 9 ·
Graduate Hellfire's introduction to quantum cosmology
- marcus
- · Replies 15 ·
Graduate Does Time Reversal Symmetry Apply to All Interactions?
- FizX
- · Replies 2 ·
Xena officially named Eris (as of 13 Sept)
- marcus
- · Replies 9 ·
Graduate Do Penrose and Carroll Agree on the Specialness of Conditions for Inflation?
- George Jones
- · Replies 10 ·
High School Which exoplanet was the first comfirmed discovery?
- kop442000
- · Replies 2 ·
Undergrad Can Distance Alone Prove Gravitational Binding?
- wolram
- · Replies 3 ·
Graduate Earth-Sun Distance Over Time: Stability & Changes Explained
- BillJx
- · Replies 7 ·
Undergrad Publications on the evolution of stars?
- Prairie
- · Replies 1 ·
Stargazing About Parabolic Telescope Mirrors
- Saladsamurai
- · Replies 7 ·
Graduate Homogeneous and Isotropic Stress-Energy Tensor in Cosmology
- nrqed
- · Replies 15 ·
Undergrad What are Some Important Effects or Phenomena in Astrophysics?
- soumyashant
- · Replies 1 ·
Undergrad Most Distant Black Hole Discovered: 13 Billion Light-Years Away!
- Astronuc
- · Replies 14 ·
Graduate Moon Perturbations: Learn Differential Gravitational Forces
- lewis198
- · Replies 9 ·
Graduate Is Matter and Energy the Same Thing? Debunking Claims About Physics
- saderlius
- · Replies 11 ·
Graduate Permeability of free space question
- captpaul101@hotmail.com
- · Replies 3 ·
Graduate Can Thermal Fluctuations in Loop Cosmology Solve the Horizon Problem?
- marcus
- · Replies 3 ·
Graduate Is Retro Causality the Key to Understanding the Evolution of Universes?
- madness
- · Replies 19 ·
Graduate Why objects at lagrangian points 4 and 5 are stable?
- magnetar
- · Replies 4 ·
Anyway, Mysterious Hole on Mars Found
- chief
- · Replies 20 ·
Graduate Accelerating Universe: Understanding Deceleration Parameter & Implications
- blumfeld0
- · Replies 7 ·
Graduate How Do Black Holes Escape Their Own Event Horizon?
- OSalcido
- · Replies 27 ·
Graduate Is Our Observable Universe Limited by the Cosmic Horizon?
- Ricky2357
- · Replies 8 ·
Graduate HII Region Temperature Structure
- Poppop
- · Replies 4 ·
Graduate What theories appose a multiverse?
- Harmony
- · Replies 1 ·
Graduate Question regarding the arrow of time
- Nasher
- · Replies 6 ·
Graduate Black hole gravity response question
- Voltage
- · Replies 1 ·
Graduate About Hubble Radius (Radius of the Hubble sphere)
- Ricky2357
- · Replies 8 ·
Graduate Do anti-stars emit or absorb photons?
- Nasher
- · Replies 6 ·
Graduate Discover the Best Book on Inflation Theory for Your Studies
- fresnelspot
- · Replies 3 ·
High School Seeing the Galilean Moons with Celestron 7x50 Binoculars
- cepheid
- · Replies 3 ·
Graduate Does the Friedmann Model Suggest an Unbounded Universe?
- da_willem
- · Replies 29 ·
Undergrad A Query on Sun and Moon Coordinate data
- lewis198
- · Replies 2 ·
Graduate Are we rewriting the birth of the solar system?
- Andre
- · Replies 1 ·
Graduate Understanding Omega: Baryons, Leptons, Photons and More
- blumfeld0
- · Replies 5 ·
Undergrad What would a black hole look like?
- MonstersFromTheId
- · Replies 6 ·
Graduate What Defines the Universe: Bostrom's Philosophy vs. Hardy's Causaloids?
- Chronos
- · Replies 59 ·
Undergrad Astronomy POD: Tan & Blue Galaxies - Why the Color Difference?
- Jimmy Snyder
- · Replies 16 ·
Graduate What kind of energy is released when matter and antimatter collide?
- ensabah6
- · Replies 4 ·
Graduate What percent of baryonic matter is antimatter?
- ensabah6
- · Replies 1 ·
High School What colors represent different stages of a star's life cycle?
- vi3taznb0i
- · Replies 2 ·
Graduate Could Dark Energy and Dark Matter be .?
- acitizenofearth
- · Replies 9 ·
Graduate Is Gliese 581d a Habitable Super-Earth?
- marcus
- · Replies 0 ·
Undergrad Measuring the Distances to Stars and Galaxies
- McHeathen
- · Replies 4 ·
Graduate If two black holes combind together-
- magnetar
- · Replies 16 ·
Graduate Is Dark Matter More Significant Than Black Holes in the Universe's Mass?
- FrigginGenius
- · Replies 2 ·
Graduate Cosmic Humility: Trillions of Years into the Future
- blumfeld0
- · Replies 9 ·
Graduate Why Should The Atom's Form Exist At All?
- justwondering
- · Replies 3 ·
Stargazing Is the James Webb Space Telescope Ready to Replace Hubble?
- meteor
- · Replies 14 ·
High School What Can I See with My Telescope in Boston?
- Saladsamurai
- · Replies 11 ·
Who said: however the Earth still rotates
- haiha
- · Replies 9 ·
Graduate Does gravity affect the measurement of pi in non-euclidean geometries?
- Teresa
- · Replies 11 ·
Graduate Dark matter searches (a survey of-)
- marcus
- · Replies 1 ·
Undergrad SKA: What's Being Planned & Job Prospects?
- Teresa
- · Replies 1 ·
Undergrad Understanding the Doppler Effect: The Red Shift and Our Place in the Universe
- OSalcido
- · Replies 3 ·
Undergrad Age of Universe: Seeing More than 13.5 Billion Yrs
- BoomBoom
- · Replies 54 ·
Graduate The Ashtekar density (you've heard of the Chandrasekhar mass, now here's )
- marcus
- · Replies 19 ·
Undergrad Interstellar Medium: Est. Mean Mass of Particle
- popffabrik1
- · Replies 1 ·
What Makes Black Holes So Mysterious and Dangerous?
- andrewking
- · Replies 20 ·
High School Could Dead Stars Lead to Abandoned Solar Systems?
- Frozenoak
- · Replies 12 ·
Undergrad Supernova 7000 ly Away: Impact on Earth and Light Visibility
- Ronhrin
- · Replies 15 ·
Graduate Accelerating Universe: How Is It Possible?
- da_willem
- · Replies 19 ·
Graduate Does 1a supernova release the same amount of neutrino as type2 supernova?
- magnetar
- · Replies 1 ·
Graduate Gravitational Waves from Mergers
- RJ Emery
- · Replies 3 ·
Graduate Why Do Stars at the Edge of Galaxies Feel an Inward Pull from Dark Matter?
- Aschere
- · Replies 2 ·
Graduate Solar Cycle & Explanation for Recent Changes?
- William Astley
- · Replies 13 ·
Graduate Simulating the Future: Great Attractor 100 Billion Years Ahead
- HarryWert
- · Replies 3 ·
High School Gravitational Lensing: Learn More about Einstein Rings
- Sourabh N
- · Replies 3 ·
Undergrad Learning Physics: How Do Neutron Stars Form?
- madphysics
- · Replies 6 ·
Graduate Is the Universe in a State of Universal Motion?
- wilgory
- · Replies 6 ·
Undergrad Is NASA's New Evidence the Most Direct Detection of Dark Matter?
- ZapperZ
- · Replies 24 ·
Graduate How Do Accretion Discs and Black Holes Emit High-Velocity Charged Particles?
- verdigris
- · Replies 6 ·
Amazing Saturn Photo: Cassini's Awe-Inspiring Image
- setAI
- · Replies 3 ·
LCDM and Cosmology and Cosmologists
- Wallace
- · Replies 2 ·
Undergrad Apparent Magnitude: Meaning & 3 Star System
- Magister
- · Replies 3 ·
Graduate A hyperbolicshape of the universe, despite measurements
- Hymne
- · Replies 3 ·
Graduate Einstein Cross vs. Ring: Understanding the Alignment of Quasar G2237+030
- Jorrie
- · Replies 3 ·
Undergrad Gravity and the Rotation of Galaxies
- sweet-stuff
- · Replies 1 ·
Undergrad Density of Gliese 581 d: What's the Real Number?
- DaveC426913
- · Replies 1 ·
Could we(entire universe) be almost nothing?
- u83rn00b
- · Replies 9 ·
Graduate Calculating Mass/Density for a 4x Larger Earth
- surfaceGravity
- · Replies 5 ·
High School Maximum number of orbiting planets
- Rothiemurchus
- · Replies 3 ·
Undergrad Why Do Comets Have Elliptical Orbits While Planets Are Circular?
- madphysics
- · Replies 9 ·
Graduate Is Too Much Physics Bad For Astronomy?
- ZapperZ
- · Replies 5 ·
Graduate Details on the galaxy crash in our future
- marcus
- · Replies 1 ·
Undergrad Is Pluto's Axis of Rotation Almost Perpendicular to Its Orbit?
- DaveC426913
- · Replies 3 ·
High School Signal Transmission from Mars to Earth
- NeoScience
- · Replies 4 ·
Stargazing Refracting vs Reflecting Telescopes: Which is Easier to Build?
- holliee
- · Replies 2 ·