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
High School Will the sun die and how?
- questura
- · Replies 28 ·
Undergrad Are All Stars Struggling with the Coronal Heating Problem?
- spidey
- · Replies 1 ·
Undergrad Understanding how energy disappears
- esvion
- · Replies 10 ·
Graduate Does Mercury's high eccentricity amplify its GR precession?
- RandallB
- · Replies 2 ·
Undergrad Does the fourth dimension introduction make sense?
- disregardthat
- · Replies 52 ·
Graduate How do you calculate white dwarf surface and core cooling timescales?
- Chronothread
- · Replies 7 ·
Graduate Create a large number of positrons in a small laboratory
- wolram
- · Replies 1 ·
Stargazing New memeber, telescope question?
- TheOak84
- · Replies 4 ·
Graduate Short questions about dark matter
- cup
- · Replies 12 ·
Graduate Is Newton's Bucket Proof of Absolute Space?
- pilopais
- · Replies 18 ·
Graduate What Causes Deuterium Fusion in Massive Planets?
- NoobixCube
- · Replies 3 ·
Undergrad Can you mathematically prove z = v/c?
- Randomguy
- · Replies 2 ·
Graduate Orbiting Planets: True Anomaly, Argument of Perihelion?
- Philosophaie
- · Replies 2 ·
Graduate Velocity-redshift-distance law for cosmological expansion
- Dave Rutherfo
- · Replies 2 ·
Undergrad Is the Sun's Gravitational Effect Stronger at the Equator than at the Poles?
- Hookemhorn21
- · Replies 6 ·
Undergrad How does Earth sustain its Mag Field?
- morenogabr
- · Replies 4 ·
Graduate How does the creation of virtual particles allow the universe to accelerate?
- PikminExpert
- · Replies 7 ·
Undergrad Gravitation vs Magnetic and Electric Field
- Philosophaie
- · Replies 13 ·
Graduate Impedance mismatch at the universes edge
- curiouschris
- · Replies 3 ·
High School Do humans face deadly radiation traveling to the moon?
- cam875
- · Replies 1 ·
Graduate How does gravity decrease with distance in a 2D universe?
- gonegahgah
- · Replies 21 ·
Graduate Superluminal Speeds and All That Jazz
- oldman
- · Replies 32 ·
Undergrad What are some freeware options for fitting radial velocity data?
- NoobixCube
- · Replies 2 ·
Graduate Could the cosmic microwave background be emitted by the intergalactic medium?
- Ignition
- · Replies 14 ·
Graduate A Realistic Cosmological Model: 90 Years of Development
- wolram
- · Replies 3 ·
Graduate Ecliptic Longitude and Right Ascension of the Sun
- Helios
- · Replies 10 ·
Graduate Geometry of the Universe varying in time?
- Gio83
- · Replies 5 ·
Undergrad What is the acceleration value of the expanding universe?
- spidey
- · Replies 6 ·
Graduate What basic cosmo stuff can you calculate from two numbers and two equations?
- marcus
- · Replies 1 ·
Undergrad Why do the Sun's/star's luminosity increase during the main sequence?
- astrostar
- · Replies 11 ·
Graduate Universe started from a cosmic singularity
- cyhan721
- · Replies 3 ·
High School How much of Einstein Online have you read?
- marcus
- · Replies 13 ·
Undergrad Standard gravitational parameter
- Sanjay87
- · Replies 4 ·
High School Why at the south hemisphere the sun rises from the west?
- ggeo1
- · Replies 14 ·
Undergrad Why Is There a Hexagon Shaped Cloud on Saturn?
- dimensionless
- · Replies 4 ·
Undergrad Could orbital solar collectors send power to Earth by radio waves?
- starkind
- · Replies 26 ·
Graduate CNB (Cosmic Neutrino Background)
- RandallB
- · Replies 4 ·
Graduate Quantum cosmo test prospects (sampling the literature)
- marcus
- · Replies 5 ·
Graduate Cosmic age problem in interacting dark energy models
- wolram
- · Replies 1 ·
Undergrad How much mass do you need to create Gravity?
- alexk307
- · Replies 16 ·
Graduate If the gravitation has very very tiny deviation from inverse square law！
- magnetar
- · Replies 4 ·
Undergrad Gravity verses electromagnetic attraction
- pulsar28
- · Replies 60 ·
Graduate Can empty space or emptiness conceive a form from which matter arise?
- Makep
- · Replies 5 ·
Graduate Why does the universe has such a huge amount of Energy?
- Veovis
- · Replies 13 ·
Undergrad Does time pass slower at Earth's center than at the surface?
- Bjarne
- · Replies 15 ·
Graduate Estimating the Sun's main sequence lifetime from fusion efficiency
- irk_t_great
- · Replies 6 ·
Graduate Does the big rip scenario lead to black hole formation or recontraction?
- beholderseye
- · Replies 3 ·
Undergrad What are causing the Eccentricity of the planets?
- Bjarne
- · Replies 3 ·
Graduate Background radiation and intensity
- peleus
- · Replies 2 ·
Graduate Could Our Universe Be Just One of Many in a Multiverse Shaped by Dark Energy?
- laymanhobbist
- · Replies 8 ·
Stargazing New to astronomy, what telescope should I get?
- GeelongMofobi
- · Replies 7 ·
Graduate CMB Particle Distribution: Shell or Ball?
- 81+
- · Replies 3 ·
Graduate Space at Singularity: Pre Big Bang Theory?
- BobbyTMS
- · Replies 4 ·
Undergrad Image Processing Software; suggestions?
- lzkelley
- · Replies 2 ·
Graduate Big Bang starting Mass (mater/antimatter)
- RandallB
- · Replies 2 ·
Graduate Space is NOT expanding. Where are the holes in this simplistic view?
- ckollerer
- · Replies 20 ·
High School Relative Intensity in Spectra: What Does It Mean?
- Lorna
- · Replies 2 ·
Undergrad How to derive the L2 Lagrangian point formula using approximation
- Irrelativity
- · Replies 8 ·
Graduate Tolman-Oppenheimer-Volkoff equation
- Orion1
- · Replies 64 ·
Graduate Textbook on Numerical Celestial Mechanics
- Coelum
- · Replies 7 ·
Graduate What is the Statistical Challenge in Understanding Dark Matter and Energy?
- wolram
- · Replies 3 ·
Graduate Intensity-wavelength graph for emission spectra; why is frequency in the x-axis?
- slakedlime
- · Replies 2 ·
Hubble down, Repair mission delayed
- Integral
- · Replies 3 ·
Undergrad Epsilon Eridani: 2 Asteroid Belts and an Icy Ring
- Astronuc
- · Replies 1 ·
Undergrad Position of Planetary systems at given time
- Lyuokdea
- · Replies 1 ·
Graduate Dipole Moments of the Planets and the sun
- Philosophaie
- · Replies 2 ·
Undergrad Could a Supermassive Black Hole Destroy Our Galaxy?
- Grogerian
- · Replies 12 ·
What Do Non-Scientists Think of Color-Enhanced Astronomy Images?
- Jimmy Snyder
- · Replies 1 ·
Undergrad Should we publicize the holographic universe theory if it's true?
- ObHassell
- · Replies 4 ·
Graduate Black Hole's Event Horizon dia. and Internal Mass dia. relationship.
- justwondering
- · Replies 2 ·
Does Moon have North and South Poles ?
- call_naveen
- · Replies 5 ·
Graduate Conventional explanations for antimatter scarcity
- marcus
- · Replies 12 ·
Graduate How does CMB temperature relate to cosmic expansion and redshift?
- mysearch
- · Replies 25 ·
Graduate How can we be sure of a singularity?
- neonpotato
- · Replies 11 ·
Graduate Are Singularities One-Sided in Terms of Time?
- Double E
- · Replies 4 ·
Comments about an issue in cosmology?
- tfb
- · Replies 10 ·
Graduate Is Matter Re-Emitted After Absorption by a Black Hole?
- db1uover
- · Replies 3 ·
High School What Is the Composition of Black Holes?
- aman.yash
- · Replies 2 ·
Is this shooting star picture authentic?
- pixel01
- · Replies 14 ·
Undergrad View from the Earth-Moon L5 point?
- StrangerTides
- · Replies 2 ·
Graduate Why does the Big Bang appear in all directions if isotropy rules out a point singularity?
- poeteye
- · Replies 3 ·
Graduate Cosmological Inflation: Theory and Observations
- wolram
- · Replies 10 ·
Graduate Can the Universe explain itself?
- nΨmanty
- · Replies 14 ·
Why does space or the outside of spacesuits have a distinct smell?
- nuby
- · Replies 4 ·
Graduate Mass-Radius relation of a Neutron star
- Tuugii
- · Replies 3 ·
Graduate Supernova gravitation field and Newton
- zankaon
- · Replies 4 ·
Graduate Polytropic Models: Solving Problem at Slide 5
- Giammy85
- · Replies 2 ·
Graduate Cosmology and Energy Quantization in Matter
- Force1
- · Replies 2 ·
Undergrad Gonegahgah's rubber sheet example
- gonegahgah
- · Replies 5 ·
Graduate CMB photon travel time and comoving distance calculations
- mysearch
- · Replies 4 ·
Graduate Use Sun to dispose of radioactive waste?
- GarageTinker
- · Replies 18 ·
High School How Has the Universe Expanded Over 13.7 Billion Years?
- Bjarne
- · Replies 3 ·
Graduate Multi billion dollar experiments
- wolram
- · Replies 5 ·
Undergrad How far can the universe stretch before it reaches its limits?
- Bosanac
- · Replies 10 ·
Graduate Peter and Pinto-Neto's bounce cosmology as alternative to inflation
- marcus
- · Replies 8 ·
Graduate What is the size of the Universe when it was only 470 million years old?
- gonegahgah
- · Replies 7 ·
High School How do you determine the longitude of the Sun?
- Philosophaie
- · Replies 10 ·
High School Spider free mount for secondary mirror
- vincentm
- · Replies 9 ·
Graduate Can Variance of Variances Define Higher Dimensions?
- Vors
- · Replies 1 ·
Graduate What caused the Big Bang to happen?
- hadeka
- · Replies 22 ·