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 The Fourth Dimension: Introduction to a Book
- disregardthat
- · Replies 52 ·
Graduate White Dwarf Cooling Model: Core and Atmosphere Temperature Relationship
- 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 Help with velocity/redshift/distance law
- 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 Can Humans Survive in a Spacecraft to the Moon?
- cam875
- · Replies 1 ·
Graduate Gravity in 2D Universe: 1/r Decrease?
- 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 Intergalactic Medium: What Is It & What Does It Mean?
- 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 Accelerating Universe: Value of Acceleration?
- 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 Space Based Power: Is it Practical? Safety Concerns & Benefits Explored
- starkind
- · Replies 26 ·
Graduate CNB (Cosmic Neutrino Background)
- RandallB
- · Replies 4 ·
Graduate Quantum cosmo test prospects (sampling the literature)
- marcus
- · Replies 5 ·
Graduate Solving Cosmic Age Problem with Interacting Dark Energy Models | arXiv:0809.3627
- 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 Change at Different Depths Inside the Earth?
- Bjarne
- · Replies 15 ·
Graduate Help with Life expectancy of Main Sequence stars.
- irk_t_great
- · Replies 6 ·
Graduate I am grappling with a big-rip scenario. Anyone knowledgable:
- 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 Calculating L2 Lagrangian Point: A Beginner's Guide
- 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 Explore the Holographic Universe Theory
- 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 What Does 'The Mystery of the Missing Antimatter' Say About Antimatter Scarcity?
- marcus
- · Replies 12 ·
Graduate CMB Clarifications: Understanding the Impact of Expansion and Temperature Shift
- 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 ·
Investigating the Authenticity of a Shooting Star Picture
- pixel01
- · Replies 14 ·
Undergrad View from the Earth-Moon L5 point?
- StrangerTides
- · Replies 2 ·
Graduate Looking back in time to the Big Bang
- poeteye
- · Replies 3 ·
Graduate Cosmological Inflation: Theory and Observations
- wolram
- · Replies 10 ·
Graduate Can the Universe explain itself?
- nΨmanty
- · Replies 14 ·
The Smell of Space: Mystery & Explanation
- 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 Help w/ Logic Behind Numbers & CMB Photon Expansion
- 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 Is Peter & Pinto-Neto's Non-Singular Bounce the Future of Cosmology?
- marcus
- · Replies 8 ·
Graduate What is the size of the Universe when it was only 470 million years old?
- gonegahgah
- · Replies 7 ·
High School Find Longitude of Sun - Learn How Now
- 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 The Cause of the Big Bang: Proven Theories
- hadeka
- · Replies 22 ·
Graduate Universal constants changing into new ones?
- powersgood
- · Replies 1 ·
Graduate More about that gamma burst (the brightest ever recorded)
- marcus
- · Replies 4 ·
Graduate Antimatter gravity hypothesis-question
- orion24
- · Replies 9 ·
Graduate Zeroth Law of Thermodynamics
- Beastcloud
- · Replies 1 ·