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 Black Holes May Contain Tiny Universe - Nariai Universes
- hammertime
- · Replies 8 ·
Undergrad How do you measure black hole mass differently than planet mass?
- Eternalmetal
- · Replies 14 ·
Graduate Complete Hill Sphere Derivation: Learn the Equation and its Derivation Process
- Tefeari
- · Replies 5 ·
Graduate Does satellite mass affect the Hill sphere formula?
- Fennelgiraffe
- · Replies 7 ·
High School How can I write a 5 page paper on the origin of the solar system?
- SolarSystHelp
- · Replies 2 ·
Identifying Objects in the Solar System
- ElizebethDylan
- · Replies 15 ·
Graduate How big can a body get (size wize) before it collapses onto itslef?
- rubecuber
- · Replies 11 ·
Graduate Would a black hole create a wormhole in space?
- cooldude3122
- · Replies 5 ·
Graduate Finding AGB Star Phases: Modeling S-Process in a Helium Shell Burning Region
- malawi_glenn
- · Replies 2 ·
Graduate What Lies Beyond the Edge of the Universe?
- ColdFusion85
- · Replies 36 ·
Graduate What Happened to the Energy from Matter/Anti-Matter Annihilation?
- phetuspolice
- · Replies 1 ·
Is There Real Evidence for the Moon Landing?
- davidschmid10
- · Replies 3 ·
High School Layperson books on space, time, dimensions and quantum gravity
- squidley
- · Replies 8 ·
Graduate Is the Evidence for Dark Energy Secure?
- cristo
- · Replies 5 ·
Undergrad Online planetarium site for identifying stars at your location
- Art
- · Replies 3 ·
Undergrad Calculating Circumpolar Star Declination for Different Latitudes
- shaheen
- · Replies 3 ·
High School Can we see stars from other galaxies with the naked eye?
- onemind
- · Replies 6 ·
Graduate G from cosmological measurements
- rbj
- · Replies 1 ·
High School Can Carbon Nanotubes Make Space Elevators a Reality?
- DaveC426913
- · Replies 33 ·
Graduate An way to visualize dark matters effects on space-time?
- freerangequark
- · Replies 4 ·
Graduate Thought Experiment on Dark Matter
- notknowing
- · Replies 2 ·
High School Help with astronomy homework problems 7 and 8
- ElizebethDylan
- · Replies 1 ·
Graduate What is the elusive origin of gravity?
- wolram
- · Replies 70 ·
High School Agol, Interesting objects in Perseus.
- Integral
- · Replies 5 ·
Undergrad Does Increasing Density Increase Gravity?
- gaurav_shade
- · Replies 27 ·
Undergrad Sources on the search for Earth-like exoplanets
- El Hombre Invisible
- · Replies 2 ·
Graduate What Is the Universe's Topology According to Recent Research?
- Pavel
- · Replies 25 ·
High School Best cosmology and theoretical physics books for beginners
- pkarnett
- · Replies 5 ·
Graduate Why doesn't initial homogeneity solve the horizon problem?
- NumberTenOx
- · Replies 9 ·
Graduate Data on galaxies -good references ?
- notknowing
- · Replies 1 ·
Undergrad Types of Supernovae: How to Distinguish Them
- pixel01
- · Replies 1 ·
Graduate Singularity/Expanding Universe questions
- swerdna
- · Replies 25 ·
High School Space Temperature: Is There a Temperature in Space?
- marsi
- · Replies 3 ·
Graduate Can wormholes or other theories make interplanetary travel possible?
- TomMac321
- · Replies 13 ·
Stargazing Looking for advice on telescope
- Art
- · Replies 8 ·
Undergrad Solar Wind Flux: Electron/Proton Count Reaching Earth
- spideyinspace
- · Replies 2 ·
Undergrad Weight dependent on planet size and rotation speed?
- NHsolarguy
- · Replies 1 ·
Undergrad How much physics do I need to start learning cosmology?
- quantumfireball
- · Replies 7 ·
Stargazing Is there a DSLR with programmable frame rate for sequential shots?
- Telmerk
- · Replies 3 ·
Graduate Miniprobes for interstellar exploration
- OSalcido
- · Replies 8 ·
High School Why Does the Aurora Only Occur in the North Pole?
- spideyinspace
- · Replies 2 ·
High School Is the Milky Way Really a Spiral Galaxy?
- pixel01
- · Replies 2 ·
High School Can Dark Matter and Dark Energy Be Used to Explain Superhero Powers?
- Benicus
- · Replies 4 ·
Is the Rocket Equation Holding Back Space Shuttle Safety?
- ScienceGurl
- · Replies 26 ·
Undergrad Do hydrogen fusion reactions in the sun produce neutrons or neutrinos?
- spideyinspace
- · Replies 6 ·
Undergrad Does the Sun's fusion reaction produce neutrons or neutrinos?
- spideyinspace
- · Replies 4 ·
Graduate Can Andromeda Detect Earth's Past with a Giant Telescope?
- Holocene
- · Replies 20 ·
Graduate Highest Energy Cosmic Rays Linked to Violent Black Holes
- ZapperZ
- · Replies 8 ·
Graduate What Happens When a Black Hole Evaporates Below its Schwarzschild Radius?
- Ascending One
- · Replies 32 ·
Graduate Do wormholes actually exist or just mathematical artifacts?
- bassplayer142
- · Replies 1 ·
Graduate Is metallicity a mass or number fraction?
- malawi_glenn
- · Replies 2 ·
Graduate Evidence for Arp's cosmology and the quasar redshift hypothesis
- pervect
- · Replies 4 ·
High School What happens to space when matter moves through it?
- a Buddhist
- · Replies 4 ·
High School Is the Universe Actually Spiky Instead of Smooth?
- poet
- · Replies 2 ·
Graduate Criticism of imaginary time in the Hartle-Hawking model
- pbethala
- · Replies 5 ·
Where did the universe come from?
- Joza
- · Replies 13 ·
Stargazing Neutrino Telescopes may have nothing to see
- BDOA
- · Replies 9 ·
What is the Naked Eye Comet in Perseus?
- wildman
- · Replies 11 ·
Graduate What is the Estimated Local Star Formation Rate and How Accurate is it?
- randa177
- · Replies 5 ·
Graduate Upper limit on the rest mass of neutrinos if. .
- UMich1344
- · Replies 1 ·
Undergrad How was Earth's 23-degree axial tilt determined?
- plutoisacomet
- · Replies 4 ·
Undergrad Questioning the big bang theory.
- James_Egan
- · Replies 8 ·
Graduate Is the Universe Actually a Cosmic Computer?
- martix
- · Replies 3 ·
Undergrad What Happens in Black and White Holes?
- DR OF DEATH
- · Replies 26 ·
Graduate Photon Energy vs. Red Shift, Inflation Theory, Acceleration
- gtw
- · Replies 18 ·
Graduate Meaning of cosmological constant ?
- notknowing
- · Replies 4 ·
Graduate What causes the thin vertical wind from quasar accretion disks?
- Jorrie
- · Replies 7 ·
Graduate Does the Big Bang Theory Break Down at the Planck Time?
- Moridin
- · Replies 12 ·
High School Does a Black hole emit anything?
- n4nova
- · Replies 1 ·
Graduate Hubble's Redshift: Conclusions and Vacuum Solutions
- OOO
- · Replies 3 ·
Undergrad How Much difference b2in theoritical and experimental astrophysics?
- SuperStringboy
- · Replies 1 ·
High School Why do planets revolve in elliptical orbits?
- spideyinspace
- · Replies 2 ·
Undergrad Can lunar surface albedo produce enough light to wash out stars for astronauts?
- Billahertz
- · Replies 8 ·
Graduate How can we see the early universe's material if it later became our star?
- rogerp
- · Replies 10 ·
Graduate Does the Confusing Supernova Challenge the Big Bang Theory?
- pbethala
- · Replies 4 ·
Graduate Is the Big Bang Theory a Foolhardy Extrapolation?
- OOO
- · Replies 58 ·
Graduate Big Bang and the Second Law of Thermodynamics
- pbethala
- · Replies 3 ·
High School What Pulls the Sun? Understanding Gravitational Pull and Mass Effect
- michelrochette
- · Replies 7 ·
Graduate Can civilizations use the entropy gap in an expanding universe for energy?
- hammertime
- · Replies 3 ·
Graduate Will the expanding universe keep accelerating forever?
- hammertime
- · Replies 2 ·
High School Does a planets orbit ever go chaotic?
- Hamish Cruickshank
- · Replies 5 ·
Stargazing How to cancel out magnification in a telescope with additional lenses
- mufan
- · Replies 8 ·
Graduate Friedmann Cosmology at T < 1 second
- Jorrie
- · Replies 10 ·
Is Earth at Risk from Rogue Black Holes?
- hammertime
- · Replies 5 ·
High School What Does Expanding Universe Mean?
- Dan Tee
- · Replies 7 ·
Undergrad Universe expansion -> t = - inifinite
- JPC
- · Replies 5 ·
Graduate Question on gravitational lensing
- notknowing
- · Replies 8 ·
Graduate Why does the particle falling into a black hole have negative energy in Hawking radiation?
- jnorman
- · Replies 1 ·
High School How could the Big Bang escape its own gravitational pull?
- kalle437
- · Replies 3 ·
Graduate Can a Photon's Energy Approach Zero?
- jonmtkisco
- · Replies 4 ·
Undergrad Could a planet on the opposite side of the sun remain undetected?
- Blackwing
- · Replies 20 ·
Graduate Friiedman Fun Facts to know and tell
- jonmtkisco
- · Replies 54 ·
High School Will the sun orbit bodies with greater gravity than itself?
- Destrio
- · Replies 10 ·
Graduate What are the unexpected aspects of cosmology?
- wolram
- · Replies 2 ·
High School Finding an asteroid database by position and date
- big man
- · Replies 5 ·
Graduate Are Wormholes at the End of Black Holes a Possible Theory?
- riverkee
- · Replies 3 ·
Graduate Can Energy Compression Create a Black Hole?
- randa177
- · Replies 6 ·
High School Edwin Hubble's Redshift and the Hubble Space Telescope
- Holocene
- · Replies 11 ·
Is the Space Station Being Decommissioned?
- ScienceGurl
- · Replies 13 ·
Graduate Could Big Rip expansion create new universes from particles?
- CuriousGreg
- · Replies 6 ·