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 Did dark matter form at the same time as baryonic matter?
- wolram
- · Replies 1 ·
Graduate Can dark energy be converted into dark mass?
- pentazoid
- · Replies 3 ·
Graduate How many exoplanets with an atmospheric oxygen signature would be necessary?
- zankaon
- · Replies 13 ·
High School Creating oxygen(co2) out Of hydrogen
- athrax
- · Replies 5 ·
Graduate Does isotropy break down at the edge of a finite universe?
- slipknotFor
- · Replies 12 ·
Stargazing I want to make an astronomical telescope
- sanphy
- · Replies 10 ·
Graduate Can a far distant star's momentum affect the universe's energy?
- old ned
- · Replies 3 ·
High School May 10-12 1999 The Day the Solar Wind Disappeared
- Philosophaie
- · Replies 2 ·
Undergrad How Do We Determine the Direction of an Interstellar Signal?
- jshuford
- · Replies 2 ·
Undergrad At what point, if any, would a spaceshp burn up in space?
- Darrin
- · Replies 8 ·
How can I track Earth's distance to the sun on a specific date?
- qntty
- · Replies 2 ·
High School What can be done about space junk
- WhoWee
- · Replies 7 ·
Graduate Infinite density to finite density
- mistrbigshot
- · Replies 4 ·
Undergrad How long would life survive if the sun disappeared?
- Charlie G
- · Replies 6 ·
Undergrad What Are Simple Unsolved Problems in Astrophysics for Beginners?
- stanford1463
- · Replies 1 ·
Graduate Is Inertia Truly Uniform in All Directions?
- Carid
- · Replies 19 ·
Graduate How far away could we detect ourselves?
- nottheone
- · Replies 4 ·
Graduate Why is the light speed delay ignored by cosmologists?
- Peter Watkins
- · Replies 18 ·
Graduate Stellar type distribution across galaxies and over time
- TheSicilianSa
- · Replies 2 ·
Undergrad Why don't stars orbit black holes instead of falling in?
- dj1972
- · Replies 45 ·
High School How do astronomers calculate the distance to a star?
- ElectroBurger
- · Replies 11 ·
Undergrad Is a Cosmic Dust Storm Heading Our Way?
- Astronuc
- · Replies 1 ·
Graduate Literature on Black Hole Pair Production (?)
- Jan Paniev
- · Replies 3 ·
High School Could gravitational energy be used as a power source?
- Mirza90
- · Replies 3 ·
Graduate WMAP Data for l(l+1)Cl/2pi vs. l Plotting
- S.P.P
- · Replies 3 ·
Undergrad How is heat transfered in space?
- FountainDew
- · Replies 8 ·
Can we generate energy from black holes?
- ALYAZAN
- · Replies 10 ·
Undergrad Something and Nothing of Universe
- redhedkangaro
- · Replies 26 ·
Undergrad Ciddor equation. this may be wrong forum, but i dont know where this goes.
- bman!
- · Replies 2 ·
Graduate How does spacetime curvature make planetary orbits straight?
- hermy
- · Replies 13 ·
Graduate What Can the Hubble Ultra Deep Field Teach Us About Our Cosmic Origins?
- Peter Watkins
- · Replies 2 ·
High School Does energy require space and matter to exist?
- wannaknow4995
- · Replies 18 ·
Graduate Newtonian potential singularity at the sphere center
- TheSicilianSa
- · Replies 1 ·
Undergrad Calculating Speed of Halley's Comet at Aphelion/Perihelion
- swelzba9
- · Replies 2 ·
Undergrad What Is the Current Estimated Size of the Universe?
- Rocketjj
- · Replies 17 ·
High School What I see in sky - Milky Way, other stars
- Homer Simpson
- · Replies 44 ·
Graduate Does spacetime stretching during inflation preserve the speed of light?
- SW VandeCarr
- · Replies 14 ·
Graduate Is the Universe's Size Determined by Hubble's Rate of Expansion?
- TheSicilianSa
- · Replies 13 ·
High School Dropped popcorn kernel from space will it pop?
- LionTigerFire
- · Replies 3 ·
Graduate Where Does the Lost Energy Go in Cosmological Redshift?
- Bobbywhy
- · Replies 2 ·
Graduate Possibility of affordable interstellar space flight
- wolram
- · Replies 1 ·
High School Real time effects of light, light speed, and the sun?
- rolandov00
- · Replies 4 ·
Graduate Estimating the effective grammage of the galaxy
- pastro
- · Replies 1 ·
Stargazing What is the Hubble Space Telescope and how does it work?
- poonam.jain
- · Replies 1 ·
Graduate Can neutrinos have mass if they travel at light speed?
- theLHC
- · Replies 2 ·
Stargazing Photographing Comet Lulin and its anti-tail
- sas3
- · Replies 1 ·
Graduate Do Strange Stars and Strange Black Holes Really Exist?
- kurious
- · Replies 6 ·
Graduate Time Scale Problem: Solving Diffusion Time of Particles in 2D Space
- ishmandoo
- · Replies 1 ·
Graduate Where does the sun rise, w/ axial tilt?
- bdforbes
- · Replies 9 ·
High School What is BIAS? Learn About CCDs With Randa
- randa177
- · Replies 4 ·
Undergrad Black Holes effect on each other
- drzzt300drdn
- · Replies 11 ·
Graduate 'Local' Dark Energy effect, if any?
- justwondering
- · Replies 20 ·
High School Is there a definite number of atoms in the universe?
- Geekchick
- · Replies 1 ·
High School What astronomy topics work for an A-level extended project?
- varun19
- · Replies 1 ·
High School Research question ideas for IB astrophysics extended essay
- physicforee
- · Replies 1 ·
Graduate Consciousness and other universes
- nicko578
- · Replies 2 ·
Graduate Impossible to graph position vs time?
- leok
- · Replies 7 ·
High School Can a Gelatinous Ooze Exist in the Vacuum of Space?
- daward74
- · Replies 6 ·
Graduate Would object density in the night sky indicate if we're near the Big Bang's center?
- hartlw
- · Replies 43 ·
Undergrad Orbital speed of stars within galaxies?
- Holocene
- · Replies 9 ·
Graduate Logical Error of Cavendish Experiment
- Mammo
- · Replies 27 ·
Graduate How Does Dark Energy Influence Galactic Movements Despite Being Undetectable?
- jnorman
- · Replies 8 ·
Graduate What was the Time of Baryon Asymmetry After the Big Bang?
- spidey
- · Replies 2 ·
Graduate 'Frame' symmetry breaking - when did it happen?
- Dmitry67
- · Replies 5 ·
Undergrad Can a Close-up Apparatus Capture Distant Objects Like a Telescope?
- japam
- · Replies 11 ·
Graduate Specific Intensity, Flux, Flux Density, Radiative Transfer
- zeegoat
- · Replies 1 ·
Graduate Could the Cosmic Microwave Background Look Different from Other Vantage Points?
- starkind
- · Replies 3 ·
Amazing Mars animation with some facts
- nuketheocean
- · Replies 1 ·
Graduate Is negative gravitational energy still a viable theory?
- SW VandeCarr
- · Replies 12 ·
Graduate Can Time Differ in Nested Cylinders Traveling at Near-Light Speed?
- pmurphy4
- · Replies 1 ·
Stargazing Why Doesn't the Secondary Mirror in a Cassegrain Telescope Cause a Blind Spot?
- pegasusherd
- · Replies 7 ·
Undergrad How many stars in the Solar neighbourhood
- NoobixCube
- · Replies 9 ·
Graduate What exactly is dark energy and how is it measured?
- bredmond812
- · Replies 12 ·
Graduate How to distinguish between scale difference, motion, and equivalence in two worlds
- heldervelez
- · Replies 8 ·
Graduate Fermi-Dirac Statistics: What Is It?
- Sriram.S
- · Replies 1 ·
Undergrad Calculating Mass and Density of Planets in Our Solar System
- bassist_13
- · Replies 2 ·
Undergrad Moon's Inclination To Earth's Equator
- Mammo
- · Replies 10 ·
High School How to measure the rotation period of the moon?
- suski
- · Replies 8 ·
Graduate Changing the rotation of a natural satellite
- LF_Ent
- · Replies 3 ·
Undergrad Did Ether Exist Before the Big Bang?
- redhedkangaro
- · Replies 9 ·
Undergrad Escape velocity from Earth and moon combined
- CaptainEvil
- · Replies 5 ·
High School End of the Known Universe - Nick's Questions
- coldfrnt
- · Replies 13 ·
Northern Lights: See a Light Pillar
- pixel01
- · Replies 5 ·
Graduate Magnetic Reconnection vs Double Layers
- Suede
- · Replies 8 ·
Graduate Could a Mars-sized flyby have altered the Moon's orbital inclination?
- Mammo
- · Replies 17 ·
Graduate Where and how do jets form in quasars and gamma-ray bursts?
- Sundance
- · Replies 25 ·
Graduate Could a contracting universe create a black hole singularity?
- dubau2
- · Replies 10 ·
Undergrad Can We Measure the Diameter of Stars Using Angular Resolution and Other Methods?
- flatmaster
- · Replies 1 ·
Undergrad Gravitational pull of a black hole
- Andrew Buren
- · Replies 3 ·
Undergrad Rotating transparent object with stars - what was it?
- stargrazer
- · Replies 13 ·
Graduate How did the universe originate if matter cannot be created or destroyed?
- jobyts
- · Replies 44 ·
Graduate Can Gravity Waves Merge and Decay?
- wolram
- · Replies 1 ·
Graduate What is the Difference Between 1D Spectra and 2D Spectra?
- randa177
- · Replies 9 ·
High School Good telescope for astronomy student with $500 budget
- LucasJ
- · Replies 10 ·
Undergrad What Is the Stone’s Speed at 96,000 km From Earth?
- weltza
- · Replies 8 ·
Undergrad How can dark matter explain the need for modifications to the CDM model?
- mesogen
- · Replies 33 ·
Undergrad Could dark matter be an unknown form of plasma?
- hkhandrika
- · Replies 23 ·
Graduate How Far Must a Planet Be to Become Tidally Locked with Different Star Types?
- rmatheny
- · Replies 1 ·
Undergrad Are there usable geothermal energy sources on the Moon?
- dimensionless
- · Replies 9 ·
Graduate Is the Universe Truly Nothing When Matter and Anti-Matter Cancel Each Other Out?
- hadeka
- · Replies 7 ·