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 Novel way for interstellar travel
- udtsith
- · Replies 5 ·
Undergrad Are Galaxies the Same Age if they are the Same Distance From Us?
- EskWIRED
- · Replies 3 ·
Graduate Is the concept of space and time before the Big Bang scientifically irrelevant?
- Superposed_Cat
- · Replies 4 ·
Graduate Can a solid planet become a star?
- fbs7
- · Replies 21 ·
Undergrad Why haven't we established permanent space settlements yet?
- bodykey
- · Replies 20 ·
Undergrad Can a Gamma Ray Burst create a shadow on Earth from the Sun?
- tionis
- · Replies 12 ·
Graduate Laser Communications in Outer Space
- bodykey
- · Replies 9 ·
Graduate Could the objects in the universe be shrinking?
- theojohn4
- · Replies 24 ·
Graduate Could Black Holes Be Baby Universes Evolving Backwards in Time?
- fractalzen
- · Replies 1 ·
Graduate Origin from Nothing - what does it mean?
- StateOfTheEqn
- · Replies 51 ·
Undergrad IRAF can't deal with .fits files
- PLuz
- · Replies 7 ·
Graduate Empirically testing black holes.
- MathematicalPhysicist
- · Replies 5 ·
Graduate Deceleration Parameter Computation
- roam
- · Replies 5 ·
Graduate Does geometry have any bearing on the fine tuning argument.
- Redstart
- · Replies 12 ·
Graduate Is it Reasonable to Assume our Galaxy is in a Steady State?
- mmtwwla
- · Replies 1 ·
Undergrad Acceleration proportional to what?
- us40
- · Replies 3 ·
Graduate Can you imagine geometry without matter and light?
- marcus
- · Replies 31 ·
Undergrad Gravity and Supernova - My understanding
- EinsteinII
- · Replies 6 ·
Graduate Acceleration of expanding universe question
- qedigiv
- · Replies 1 ·
Graduate How Does Light Behave Near a Star?
- bodykey
- · Replies 2 ·
Graduate No Boundary Condition Universe: Stephen Hawking
- us40
- · Replies 5 ·
Graduate Light that is directed towards the center of a black hole
- jaydnul
- · Replies 10 ·
Graduate Can space plasma explain dark matter?
- Reid Knapp
- · Replies 4 ·
Graduate Is space itself a physical object or just an abstraction?
- MathJakob
- · Replies 30 ·
Graduate What Are Stephen Hawking's Greatest Contributions?
- shounakbhatta
- · Replies 1 ·
High School Expanding Universe: Is Space Like a Balloon?
- us40
- · Replies 4 ·
Graduate After Big Bang: Are There Different Universe Building Blocks?
- Jobrag
- · Replies 1 ·
Graduate What is the Composition of an Exoplanet 50 Light Years Away?
- willstaruss22
- · Replies 8 ·
Undergrad What else do we know about dark matter?
- ryanuser
- · Replies 7 ·
High School What is the Speed of the Lunar Terminator?
- Numeriprimi
- · Replies 8 ·
Messier 45 image from October 2013
- spark802
- · Replies 8 ·
Graduate Gamma ray bursts (GRB's) and the Ordovician Mass Extinction
- jim mcnamara
- · Replies 12 ·
Undergrad Dark matter comprises over 80% of the universe
- Ameretsu
- · Replies 12 ·
Graduate Info on tests done in the past for expanding universe
- scott22
- · Replies 3 ·
High School How do clocks keep up with time?
- cowls192
- · Replies 15 ·
High School Compare weights at equator and poles?
- cbere2013
- · Replies 2 ·
High School Shape of Universe: What is Its Form?
- shivakumar06
- · Replies 2 ·
Graduate Why does the Big Bang theory require inflation and dark matter?
- Just Wondering
- · Replies 27 ·
Graduate Photon pressure from energy density
- emz
- · Replies 5 ·
Undergrad Sunspot plotting and angular velocity
- ExoP
- · Replies 7 ·
Graduate What Lies Beyond the Observable Cosmos?
- jamescopple
- · Replies 2 ·
Graduate How does rainbow gravity reshape our understanding of inflation?
- wolram
- · Replies 1 ·
Graduate Is Dark Flow Evidence of Other Universes According to Planck Data?
- keepit
- · Replies 2 ·
Undergrad Parallax of a star measured from Venus's orbit
- fatima_a
- · Replies 3 ·
Graduate What happens to gravity in one dimension of space?
- KeplerJunior
- · Replies 6 ·
Graduate Centrifuge and Radial Bouyancy in space
- Albertgauss
- · Replies 6 ·
Undergrad Why Rigel wouldn't be visible in Cuba's sky shortly after sunset
- Wheelwalker
- · Replies 3 ·
Graduate Did uncertainty principle apply before the big bang?
- Rosen
- · Replies 7 ·
Graduate Can Matter Be Transferred Between Universes?
- shivakumar06
- · Replies 4 ·
Graduate Suppose gravitons do leak into Calabai Yau spaces
- keepit
- · Replies 13 ·
Undergrad Can Extra Dimensions Solve the Central Singularity of Black Holes?
- jaydnul
- · Replies 12 ·
Undergrad What is a gravitational sling-shot?
- rogerk8
- · Replies 11 ·
Graduate Does a FRW universe with p = -ρc²/3 have a Big Bang singularity?
- johne1618
- · Replies 2 ·
Graduate Two kinds of flatness? cosmological constant?
- Khashishi
- · Replies 7 ·
Graduate How to calculate when an object will be directly
- Wheelwalker
- · Replies 4 ·
Graduate The linearization of the metric of curved space-time
- maica
- · Replies 6 ·
Graduate Could our universe have originated from a black hole in another universe?
- MathJakob
- · Replies 1 ·
Undergrad How do atoms move through space?
- jovenstef
- · Replies 4 ·
Graduate What Do Canonical Quantum Gravity Models Tell Us About the Big Bang?
- skydivephil
- · Replies 2 ·
High School Is black hole a theoretical concept or a natural phenomenon?
- Phy_enthusiast
- · Replies 17 ·
Graduate Universe is infinite-no beginning and no end
- pullmanwa
- · Replies 3 ·
Undergrad Values of Right Ascension which are best for an observer
- ecastro
- · Replies 1 ·
Graduate Problem understanding how universe is infinitely flat
- nikolakis
- · Replies 10 ·
Graduate Predicting the Radius of the Sun as a Red Giant with SSM
- 1239
- · Replies 4 ·
Graduate Is Euclidean space an affine space?
- BruceW
- · Replies 0 ·
Graduate Are galaxies net importers or exporters of mass/energy?
- UltrafastPED
- · Replies 1 ·
Undergrad How has CMB research affected modern technology
- lightningmil
- · Replies 2 ·
Graduate What temperature will occur at the big crunch and can life survive it?
- saurabhjain
- · Replies 1 ·
Graduate Why is the observable universe flat if gravity warps space?
- keepit
- · Replies 11 ·
Undergrad Fate of Galaxies: Will Stars be Pulled into Black Holes?
- pforeman
- · Replies 2 ·
Graduate Accelerating, Expanding Universe Questions from a Novice
- yonglin426
- · Replies 4 ·
Graduate Consumption of a galaxy by its central black hole
- Televisionary
- · Replies 3 ·
Graduate A small black hole goes thru a toroidal hole.
- negativzero
- · Replies 34 ·
Graduate Effects of super massive blackhole on galactic movement
- gusmuf
- · Replies 9 ·
Graduate What is space in contrast to void?
- goldust
- · Replies 7 ·
High School Evidence of water found in Martian soil
- MathJakob
- · Replies 11 ·
Undergrad Asteroid Impacting Venus: Will it Strike or Explode?
- willstaruss22
- · Replies 1 ·
Graduate How much does Earth's gravity slow time compared to space?
- seb7
- · Replies 7 ·
High School Why does Earth have an axial tilt
- shifty88
- · Replies 22 ·
Graduate Can the shape of the universe be inferred from the CMBR?
- goldust
- · Replies 6 ·
Graduate Were photons present in the quark-gluon plasma and what is neutrino decoupling?
- mrcotton
- · Replies 5 ·
High School How does a planet clear its orbit if everything orbits at the same velocity?
- cookant
- · Replies 6 ·
Graduate Is the microwave background radiation still decreasing?
- goldust
- · Replies 13 ·
Graduate War, space, and the evolution of Old World complex societies
- jim mcnamara
- · Replies 1 ·
High School Why do we see the Sun as white if it actually emits all colors?
- killocan
- · Replies 11 ·
Undergrad Is the inner core of earth affected by the moon?
- DirectChange
- · Replies 2 ·
Graduate Gravitational waves analogous to photons and EM radiation?
- keepit
- · Replies 6 ·
Undergrad How can I use the Newton Method to find the eccentric anomaly for Mars?
- smmSTV
- · Replies 1 ·
Graduate Rewinding a black hole - Can a spinning black hole become a star?
- Umbra
- · Replies 1 ·
Graduate How Does Lower Moon Mass Affect Its Orbit Distance from Earth?
- paulcretu
- · Replies 9 ·
First binary star system ever discovered
- Phy_enthusiast
- · Replies 20 ·
Graduate What about 2nd law of thermodynamics in Cyclic Universe Model?
- jarekd
- · Replies 3 ·
Graduate How Much Mass Energy Does a Black Hole Re-Radiate?
- Islam Hassan
- · Replies 10 ·
Graduate Traveling to other universes in an infinite multiverse
- Jared409
- · Replies 7 ·
Graduate Turn a sinusoid into a elliptic orbit
- Philosophaie
- · Replies 7 ·
Graduate Testing gravity quantization with CMB polarization
- wolram
- · Replies 1 ·
High School Do 'Space Rainbows' Exist Outside of Planetary Atmospheres?
- BrowncoatsRule
- · Replies 4 ·
Graduate Reconciling two methods for perifocal coordinates from Keplerian elements
- Philosophaie
- · Replies 1 ·
Graduate What is galileon cosmology?
- skydivephil
- · Replies 2 ·
Graduate Could Dark Energy be a form of Dark Matter
- rp1220
- · Replies 9 ·