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 How can the universe be big enough to fit all the stars when it's not that old?
- Curiousity28
- · Replies 8 ·
Graduate Human observer & cosmological interpretations
- pd4pd5
- · Replies 5 ·
Graduate Cosmic time and a cosmic location.
- keepitmoving
- · Replies 12 ·
Undergrad Can things exist/develope without gravity?
- ζ → 0
- · Replies 12 ·
High School Figuring the location of the sun
- vorare
- · Replies 1 ·
Undergrad Interesting astro/phys question I'd like the naswer to
- ajm133
- · Replies 3 ·
Graduate How Can Newcomers Understand Hubble's Law and Cosmology Basics?
- marcus
- · Replies 6 ·
Stargazing What is the best telescope for beginner astrophotography?
- Major_Cj
- · Replies 1 ·
Graduate Time & Black Holes: Creative Perspective on Creation
- Restless Mind
- · Replies 17 ·
Graduate Vacuum Energy - Pair Production Confusion
- benk99nenm312
- · Replies 31 ·
Graduate Is Gamma Ray Emission from a Black Hole Really Possible?
- Vebjorn
- · Replies 1 ·
Undergrad Redshift: Is the Universe Slowing or Accelerating?
- PZIG98
- · Replies 24 ·
Collisional model of asteroids and their debris
- Mateja
- · Replies 3 ·
Undergrad Why don't stars in a cluster clump?
- pixel01
- · Replies 12 ·
Graduate Help with Bohm's Criterion: Pre-Sheath Explained
- appsci
- · Replies 1 ·
Graduate Where can I get C14 data for cellulosic material?
- contextion
- · Replies 17 ·
High School Beginner's Guide to Stargazing: Tips for Observing Space from Mumbai, India
- yash25
- · Replies 13 ·
Graduate Why Do Graphs of the Cosmic Microwave Background Show a Peak at 2mm, Not 1mm?
- trekie
- · Replies 8 ·
High School Are there any equations I can solve on a 10-hour road trip?
- Vebjorn
- · Replies 6 ·
Graduate What is frequency of a gamma ray emitted from a supernova
- d0wnl0w
- · Replies 21 ·
Graduate Assumption of spherical nature of the universe
- Rymer
- · Replies 8 ·
Graduate The Edge of the Physical Universe
- Simple10
- · Replies 11 ·
High School Earth transits the Sun as viewed from Mars in 2005?
- Cecil
- · Replies 5 ·
High School Getting to Mars: Is 4 Days Possible?
- Anthony Rocco
- · Replies 7 ·
Undergrad How Can We Understand the Concept of Universe's Temperature?
- pixel01
- · Replies 3 ·
Graduate If space is expanding (moving) then does relativity change?
- T.O.E Dream
- · Replies 4 ·
High School Are there any stars that do not have a planetary system?
- pixel01
- · Replies 28 ·
High School Can Staring at Stars Really Make You Deaf?
- lola.bonane
- · Replies 4 ·
Undergrad Nature of Universe: Latest Thinking Explored
- Starproj
- · Replies 3 ·
Undergrad Counting Stars in Universe: How Big Bang Began
- Pupil
- · Replies 7 ·
Graduate How to Extract Effective Mass from a Logarithmic Galactic Potential?
- FunkyDwarf
- · Replies 9 ·
Undergrad Mercury's Tidal Lock & Eccentric Orbit Explained
- pixel01
- · Replies 20 ·
Undergrad Universe Acceleration: When Did it Begin?
- Ranku
- · Replies 5 ·
High School Difference between Astronomy and Cosmology is?
- Starwatcher16
- · Replies 5 ·
High School What Causes the Green Tint in Some Meteors?
- Liger20
- · Replies 3 ·
High School What movies the particles of light?
- natevi
- · Replies 17 ·
Graduate What Are the Implications of the New Riess Hubble Rate?
- marcus
- · Replies 2 ·
Graduate Can mathematical beauty lead to a better understanding of physical laws?
- Jarwulf
- · Replies 5 ·
Graduate Reliability of physics as an exact description of the universe
- elemental09
- · Replies 7 ·
Undergrad Can Gravity Really Slow Down the Expansion of the Universe?
- T.O.E Dream
- · Replies 6 ·
Graduate Can Randomly Generated Brains Hold the Secrets of the Universe?
- Blenton
- · Replies 4 ·
Graduate Can Softening Length Affect Dark Matter Halo Stability in N-Body Simulations?
- florian101
- · Replies 7 ·
Undergrad Can We Build a Shaw-Fujikawa Translight Engine for Space Travel?
- randeezy
- · Replies 41 ·
Graduate Value of Hubble Parameter in Decelerating Universe
- keepitmoving
- · Replies 30 ·
High School What is the other focus in an elliptical orbit?
- ShadowDatsas
- · Replies 3 ·
Graduate Real 3-Body Systems Initial Value Problem Data
- Version 7
- · Replies 8 ·
Undergrad Hypernova release two huge jets of gamma rays
- randeezy
- · Replies 6 ·
Graduate Cosmic Microwave Background - why do we see photons from 13 billion years ago?
- lenfromkits
- · Replies 17 ·
Undergrad Black Holes vs Wormholes: What's the Difference?
- jontyjashan
- · Replies 19 ·
Graduate Small Flat Universe? How is it Possible?
- benk99nenm312
- · Replies 11 ·
Graduate Extra Dimensions: What Caused Compactification?
- keepitmoving
- · Replies 3 ·
Graduate How does the curvature of the universe evolve in cyclic models?
- zeebo17
- · Replies 3 ·
Galaxy Count: How Many in the Visible Universe?
- TalonD
- · Replies 27 ·
Graduate What is the Relationship Between Track Growth and Universe Expansion?
- Treval
- · Replies 3 ·
Graduate What exactly is cosmological inflation?
- kashiark
- · Replies 1 ·
Undergrad Is a black hole considred a black body?
- Starwatcher16
- · Replies 4 ·
Undergrad Convert km/s to kpc/Gyr: 0.964275 Factor?
- florian101
- · Replies 6 ·
Graduate Does Graviton Scatter Affect the Moons and Rings of Gas Giants?
- Hippasos
- · Replies 1 ·
Undergrad Yahoo: Earth-Venus smash-up possible in 3.5 billion years: study
- diogenesNY
- · Replies 3 ·
Undergrad Why Universe Expansion Doesn't Affect Solar System
- Mitchtwitchita
- · Replies 10 ·
Graduate Is the Universe's Electromagnetic Radiation Noise Uniformly Distributed?
- Hippasos
- · Replies 3 ·
Graduate Could the Universe Have Been Swimable During Inflation?
- mjacobsca
- · Replies 10 ·
Undergrad Heart shaped observable universe?
- StandardsGuy
- · Replies 8 ·
Undergrad Black holes - a few questions from a newb
- fawk3s
- · Replies 1 ·
Graduate Particle physics when light wave expands infinitely
- davea0511
- · Replies 2 ·
Graduate How did Jonathan Swift predict mars moon speeds?
- Ian_Brooks
- · Replies 1 ·
Is Haumea the Jinx Football-shaped Planet in the Kuiper Belt?
- DaveC426913
- · Replies 1 ·
Undergrad Help sought - data on intergalactic distances
- jooligan
- · Replies 1 ·
Graduate How is density calcuated from WMAP data
- Hal King
- · Replies 8 ·
High School Gravitational Force: Why Don't Planets Collide?”
- Mandavi
- · Replies 4 ·
Graduate Is the rate at which the universe expanding increasing?
- T.O.E Dream
- · Replies 3 ·
Undergrad Universe expanding +c. +c impossible?
- budd
- · Replies 3 ·
High School Why Doesn't Earth Fall into the Sun Due to Gravity?
- DruidArmy
- · Replies 11 ·
Undergrad From Big Bang to Iron: A Timeline of Creation
- crazy mind
- · Replies 7 ·
Graduate Uncovering the Mystery of Dark Matter: Theory and Evidence Explained
- jarlent
- · Replies 1 ·
Graduate Could Extra Dimensions in String Theory Be Larger Than Our Own?
- keepitmoving
- · Replies 10 ·
Graduate How is Dipole Anisotropy Expansion Derived in Weinberg's Cosmology?
- nicksauce
- · Replies 2 ·
Graduate Is this interpretation on Hubble's Law/Constant right ?
- srikkanth_kn
- · Replies 2 ·
Undergrad Harnessing Energy from Outer Space - Solar, Nuclear & More
- juice81sc
- · Replies 10 ·
High School Is the ground moving or are we moving?
- AlisonArulia
- · Replies 20 ·
Graduate Potential energy of a particle within a dark matter halo
- florian101
- · Replies 9 ·
Where does word universe originate from?
- anonymoussome
- · Replies 21 ·
Graduate What Happens to Gravity and Temperature at the Center of a Black Hole?
- cragar
- · Replies 33 ·
Undergrad So how fast are we actually moving?
- Nexus555
- · Replies 75 ·
Graduate No need for dark energy , gravity will suffice.
- Peter Watkins
- · Replies 85 ·
Graduate How seriously do you take the FLRW model?
- skippy1729
- · Replies 16 ·
Graduate Wanted to find out some things about the universe
- RowRow
- · Replies 3 ·
High School Why does the sun travel faster about its equator?
- Ian_Brooks
- · Replies 10 ·
Undergrad Why does the sun have non uniform distribution of magnetic fields?
- Ian_Brooks
- · Replies 3 ·
Graduate Can Black Holes Create Interdimensional Bridges to Other Universes?
- cattatomic
- · Replies 5 ·
Undergrad Determining the individual magnitudes of two stars
- Mike89
- · Replies 2 ·
Graduate Thor's Helmet: Pre-Supernova with Emissions Nebula?”
- Stratosphere
- · Replies 2 ·
Graduate Chaotic Inflation Models & Equations
- edgepflow
- · Replies 1 ·
Graduate 2 Q's - hawking radiation and inflationary universe
- jnorman
- · Replies 9 ·
Graduate Effective Destructive Range of Supernovae?
- EngineeredVision
- · Replies 5 ·
High School Can I (amateur astronomer) detect extrasolar planets?
- SpicVir
- · Replies 9 ·
How Can I Make the Moon Look Bigger Using Mirrors?
- ragabonds
- · Replies 2 ·
Graduate When Did Gravity Separate from Other Forces After the Big Bang?
- benk99nenm312
- · Replies 2 ·
Graduate Black Hole Collision: What Would Happen?
- jontyjashan
- · Replies 13 ·
Graduate What causes the research interest in cosmology?
- marcus
- · Replies 14 ·