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
Would you book online a travel to outer space?
- maxmaxus
- · Replies 2 ·
Graduate Can a universe exist with no matter?
- Dremmer
- · Replies 9 ·
Graduate Does the zero-energy universe contradict energy conservation?
- Naty1
- · Replies 9 ·
Graduate How can the distance duality relation be derived in a model-independent way?
- aymer
- · Replies 1 ·
Undergrad Finding apparent and absolute magnitude from a Cepheid's period
- Ivan91
- · Replies 3 ·
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 Difference between black holes and wormholes
- Jadaav
- · Replies 6 ·
Graduate Why aren't human biological processes gravity-dependent?
- asimations
- · Replies 2 ·
Graduate Does modern physics support external causation for the universe's origin?
- 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 Finding Earth's orbital period with Kepler's third law
- 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 photography?
- 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 Does gravitational dilution affect timescales in the early universe?
- 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 Inflatable plastic domes for Martian settlements instead of glass
- 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 if you 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 Does interstellar dust or stars contribute more to non-dark matter?
- 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 How to determine moon phase from positions of sun and moon
- 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 Does the Big Crunch involve space contracting or just galaxies collapsing?
- 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 Do planets follow the curvature of spacetime as they orbit?
- 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 Will every possibility occur infinitely in an endless expanding universe?
- Brasse94
- · Replies 1 ·
Graduate How can matter change the geometry of spacetime?
- Brasse94
- · Replies 1 ·
Undergrad How did Kepler know the sun was at one focus of ellipses?
- 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 Can light be accelerated by a black hole's gravity?
- Andrejck
- · Replies 10 ·
Undergrad Nobody has yet seen an extraterrestrial, but scientists have found
- University
- · Replies 3 ·
Undergrad Why is Saturn's atmosphere less stormy than Jupiter's?
- nukeman
- · Replies 4 ·
12.5 billion years ago what did
- rrw4rusty
- · Replies 1 ·
Graduate Penrose and Gurzadyan respond to CMB low variance circle criticism
- marcus
- · Replies 19 ·
Graduate Trying to understand the Shape of the universe.
- dubsed
- · Replies 10 ·
Graduate Does metric expansion of space mean matter also expands?
- Landrew
- · Replies 30 ·
High School Why don't galaxies form giant solar systems?
- harp AP 2010
- · Replies 10 ·
High School Does Earth's mass of 5.97×10^24 kg include people and buildings?
- 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 Can you detect black holes through their radiation?
- RebelRiver
- · Replies 6 ·
Undergrad Stars: Creation, destruction and impact on the universe
- moonkey
- · Replies 1 ·
Graduate Where does space come from in an expanding universe?
- 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 Is 1 AU measured from Earth's center or surface?
- wg1337
- · Replies 17 ·
Graduate Dark disc constraints from missing Milky Way dark matter
- Grep
- · Replies 7 ·
Undergrad Were red dwarfs once as luminous as the Sun?
- 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 claims WMAP evidence of pre-Big Bang activity
- 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 ·