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 Is Dark Matter Only Present on a Galactic Scale?
- alvarogz
- · Replies 7 ·
Can we see the image of earth coming back to us after space travel
- asimations
- · Replies 2 ·
Undergrad Why do Planets have elliptical orbits ,AND
- gttjohn
- · Replies 10 ·
Undergrad What Are the Key Differences Between Black Holes and Wormholes?
- Jadaav
- · Replies 6 ·
Graduate Human race has come from another universe to earth
- asimations
- · Replies 2 ·
Graduate Philosophy and Physics: Questions as to the Origin of the Universe
- NihilNominis
- · Replies 9 ·
Graduate Laws of Physics may change across the Universe
- AdkinsJr
- · Replies 1 ·
Undergrad Dark Energy & Expanding Universe: Newtonian Perspective
- darkside00
- · Replies 11 ·
High School Does the Earth get bigger from the sun?
- leonstavros
- · Replies 5 ·
Graduate Expansion and Conservation of Energy
- mrspeedybob
- · Replies 10 ·
Undergrad What are the best RSS feeds for the latest astrophysics research?
- Simfish
- · Replies 1 ·
Graduate If the big crunch occurred, would time go backwards?
- Dremmer
- · Replies 8 ·
Undergrad Calculate Orbital Period of Earth: GM & a for t in Years
- DB
- · Replies 12 ·
Graduate What are the Names of the Points on a Space Elevator's Path?
- Eagle9
- · Replies 5 ·
Stargazing How Does Atmospheric Turbulence Affect Lunar Eclipse Shots?
- Dembadon
- · Replies 16 ·
High School Some very basic Astronomy questions
- yalgaar
- · Replies 7 ·
Graduate What Is the Mechanism Behind Dark Flow?
- filegraphy
- · Replies 7 ·
Graduate How Does Gravity Influence Our Understanding of Time Since the Big Bang?
- TungstenX
- · Replies 10 ·
High School What Did the Universe Look Like from the Big Bang to Now?
- SeventhSigma
- · Replies 9 ·
Graduate Empirical measurement of the expansion of the universe
- BernieM
- · Replies 8 ·
Graduate Is Quantum Astrophysics a Subfield of Astrophysics?
- Fysics
- · Replies 1 ·
Undergrad Is Time Affected by Space in the Universe?
- lay-man
- · Replies 7 ·
High School I think Eddington cooked the books .
- DAANEL
- · Replies 3 ·
Stargazing Rare Total Lunar Eclipse on Winter Solstice - Dec 21 @12:29AM EST
- Philosophaie
- · Replies 2 ·
Graduate Maximum redshift - can it move light off the scale?
- misterkel
- · Replies 4 ·
Graduate Universal fractal structure and the infinite universe
- Iam.HG
- · Replies 3 ·
Graduate Detecting Dark Matter with Germanium Atoms
- nlsherrill
- · Replies 16 ·
Undergrad Number of intelligent civilizations over the history of the galaxy
- madman143
- · Replies 2 ·
Undergrad The Space Tent: A Revolutionary Idea for Structuring Martian Towns
- Protonic
- · Replies 7 ·
Graduate Is the popular understanding of C.M.B.R. too simplistic?
- Peter Watkins
- · Replies 43 ·
High School Is the Universe Like the Inside Of A Spherical Mirror
- Godswitch
- · Replies 4 ·
High School What is a Morton Wave on the Sun?
- davenn
- · Replies 2 ·
Graduate What would happen if two black holes collided?
- Sniperman724
- · Replies 2 ·
Undergrad What Happens When We Cool and Slow Down Solar Particles?
- TungstenX
- · Replies 6 ·
Undergrad Is space an insulator? Why do satellites stay warm?
- dotancohen
- · Replies 14 ·
Undergrad Blocks of empty space within the known universe
- eksxxx
- · Replies 3 ·
Graduate Is the Cosmic Expansion Merely a Result of Heisenberg's Uncertainty Principle?
- Inductor
- · Replies 2 ·
Undergrad Dust or Suns: Which Contributes More to Dark Matter in Space?
- ClamShell
- · Replies 7 ·
Graduate Life and the size of the universe
- Mazuz
- · Replies 11 ·
Undergrad Trajectory of object around the moon as function of time
- Henriklm
- · Replies 7 ·
Graduate Pulsar Timing Accuracy: Fractional Instability to 10^-15
- mersecske
- · Replies 1 ·
High School Understanding Moon Phases: Examples & Visualization
- chod
- · Replies 3 ·
Graduate How much will the planck mission resolve about the universe.
- wolram
- · Replies 1 ·
What is the Purpose of Black Holes?
- Willowz
- · Replies 12 ·
Graduate Are Proto-Photons the Only Matter at the Outer Limits of the Universe?
- foolosophy
- · Replies 18 ·
Graduate Initial state based on current state?
- PhysDrew
- · Replies 18 ·
Stargazing Best compromise for portable telescope?
- jnorman
- · Replies 12 ·
Graduate Is There a Universe Beyond Our Own?
- RandyDisher
- · Replies 4 ·
Graduate What Causes the Big Crunch and How Does it Affect the Universe's Expansion?
- ericksvensson
- · Replies 36 ·
Graduate Force on a Swinging Rod (space elevator)
- msion
- · Replies 1 ·
Graduate Could the inflation epoch carry information faster than c
- ensabah6
- · Replies 3 ·
Undergrad How to test a parabolic mirror?
- sergeant_pv
- · Replies 4 ·
Graduate Can Hawking Radiation explain the immortality of neutron stars?
- Dremmer
- · Replies 24 ·
Graduate Faster than light and way smaller than electrons
- asimations
- · Replies 4 ·
Graduate Please explain the paths that planets take in regards to spacetime.
- Dusty_Matter
- · Replies 10 ·
Graduate Movement of Galaxies in relation to each other
- GiZeHy
- · Replies 4 ·
Graduate Bumping bubbles from our pre-bang past ( test of eternal infl.)
- marcus
- · Replies 9 ·
Undergrad Is Time Travel Possible Through Black Holes?
- philophysics3
- · Replies 8 ·
Graduate Is Time Really a Fourth Dimension Similar to Spatial Dimensions?
- MattRob
- · Replies 3 ·
Graduate Frame dragging around a rotating black hole.
- Imax
- · Replies 18 ·
Undergrad A question about expansion of the universe
- Brasse94
- · Replies 1 ·
Graduate How can matter change the geometry of spacetime?
- Brasse94
- · Replies 1 ·
Undergrad How Did Kepler Discover the Sun's Position in Planetary Orbits?
- stonecoldgen
- · Replies 1 ·
Graduate Is the Entropy of Black Holes Proportional to Their Size?
- brcooke
- · Replies 20 ·
Graduate Without Dark Matter and Dark Energy
- cbd1
- · Replies 15 ·
Undergrad How can we see stars past 13.5 billion light years away?
- dcderek24
- · Replies 6 ·
Undergrad What exactly are Magnetars? I've heard the term used before, and all I
- fillipeano
- · Replies 4 ·
Graduate Existence of super-massive black holes
- sri sharan
- · Replies 11 ·
Undergrad Is There a Center of the Universe? The Mystery of Tracing Its Boundaries
- Andrejck
- · Replies 10 ·
Undergrad Nobody has yet seen an extraterrestrial, but scientists have found
- University
- · Replies 3 ·
Undergrad Quick question: Why is Saturns atmosphere LESS stormy than Jupiters?
- nukeman
- · Replies 4 ·
12.5 billion years ago what did
- rrw4rusty
- · Replies 1 ·
Graduate Penrose Gurzadyan fire back: new paper today
- marcus
- · Replies 19 ·
Graduate Trying to understand the Shape of the universe.
- dubsed
- · Replies 10 ·
Graduate Universal Expansion: Is All Matter Expanding?
- Landrew
- · Replies 30 ·
High School Galaxy Solar System: Giant Solar Systems Explained
- harp AP 2010
- · Replies 10 ·
High School Earth's Mass: Does It Include People & Everything Else? | Simple Question
- kk727
- · Replies 11 ·
Undergrad What factors make landing on Mars easier than on the Earth? Harder?
- nukeman
- · Replies 7 ·
Graduate Solving N-Body Simulation Problems with Gravitational Equations
- Lijnk
- · Replies 8 ·
Undergrad Galaxies - spiral arms split, why?
- precisionart
- · Replies 6 ·
Undergrad Detecting Black Holes: Is It Possible?
- RebelRiver
- · Replies 6 ·
Undergrad Stars: Creation, destruction and impact on the universe
- moonkey
- · Replies 1 ·
Graduate Where Does Space Come From and What Theories Explore Its Origin?
- 36grit
- · Replies 12 ·
How can we define the universe as having a shape ?
- AshsZ
- · Replies 7 ·
Undergrad Solving Sun-Earth-Moon Orbit Problem with Solar System Simulator
- Smoove
- · Replies 28 ·
Graduate Photon Red Shift Energy losses in expanding universe theories
- alexjbuck
- · Replies 11 ·
High School Questions regarding Earth life came from Mars - ? - Thanks
- nukeman
- · Replies 5 ·
High School What is 1 AU? Definition & Explanation
- wg1337
- · Replies 17 ·
Graduate Missing Milky Way Dark Matter: Surprising Constraints on the Lambda-CDM Model
- Grep
- · Replies 7 ·
Undergrad Sun's Evolution: Tracing the Evidence from Red Dwarfs to the Present
- MathematicalPhysicist
- · Replies 11 ·
Graduate No evidence for circles in the CMB; contrary to claims by Penrose and Gurzadyan
- nicksauce
- · Replies 4 ·
Graduate Is Space More Fundamental Than Time in Our Universe?
- Dremmer
- · Replies 1 ·
Graduate Penrose: WMAP Shows Evidence of ‘Activity’ Before Big Bang
- Grep
- · Replies 43 ·
Undergrad Is Time the Movement of Matter Through Space?
- erausch
- · Replies 16 ·
Graduate What Determines the Order of Stars Hitting a Black Hole's Event Horizon?
- thedeester1
- · Replies 2 ·
Graduate Is the Universe's Expansion Actually Slowing Down?
- thedeester1
- · Replies 4 ·
High School Are Supermassive Black Holes Really at the Center of Galaxies?
- University
- · Replies 2 ·
Graduate Communication signals and the speed of light
- auxengin
- · Replies 3 ·
Undergrad Dark Energy & Light: The Mystery
- ravisastry
- · Replies 1 ·
Graduate Discovering the Shape of the Universe: An Elegant Inquiry
- Rainbow
- · Replies 29 ·