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
Undergrad Force of Gravity in terms of Density
- wildkat7411
- · Replies 1 ·
Undergrad Why would traveling through a wormhole take you to a different time?
- altairz
- · Replies 3 ·
Graduate Accelerating Universe, Relativistic Mass and Dark Energy
- oXDawidXo
- · Replies 2 ·
Graduate The Universe's Possible Cyclic Existence
- A. H. ES NA S
- · Replies 2 ·
Graduate Is Gravity Truly an Entropic Force in the Universe?
- oldman
- · Replies 2 ·
Eternal Universe - What Do You Think?
- Shadowmonk710
- · Replies 13 ·
High School Can I observe objects with negative declination from 45N?
- Freeman Dyson
- · Replies 14 ·
Graduate Is the omega point theory by Frank Tipler plausible?
- celebrei
- · Replies 22 ·
Graduate What happens to a system with mass below the Jeans mass?
- Ranku
- · Replies 7 ·
Undergrad Formulas for Elliptical Orbits X,Y,Z Co-Ordinates
- frogtag
- · Replies 2 ·
Graduate Observing Bright Stars: Project Checkup
- Berdi
- · Replies 1 ·
Undergrad Where does the missing energy go in redshift?
- david2010
- · Replies 21 ·
Graduate Detection of gravitational waves
- Ranku
- · Replies 32 ·
High School Resources for learning about black holes and astronomy
- irphysics
- · Replies 3 ·
Graduate Do gravitons exist and is gravity made of them?
- phy_freak
- · Replies 2 ·
Graduate The Universe Exists Because It Has To
- Evolver
- · Replies 97 ·
Undergrad Does Hydrogen Alone Lead to Life in the Universe?
- FUNKER
- · Replies 1 ·
Undergrad How Do Black Holes Influence the Path of Light?
- vorcil
- · Replies 2 ·
Undergrad Could Titan Support Life Like Earth in the Future?
- curious_cat
- · Replies 2 ·
Undergrad Electromagnetic frequency question
- mcjosep
- · Replies 6 ·
Remnants of asteriods caught in image?
- turbo
- · Replies 1 ·
Undergrad Betelgeuse Supernova: Did It Happen?
- paigecoal
- · Replies 2 ·
Stargazing Building Telescope Signting Laser
- wil3
- · Replies 4 ·
Graduate What Are the Current Controversies in Quintessence Theory?
- NateQPublic
- · Replies 1 ·
High School Does Saturn Have a Hexagon on it?
- Glennage
- · Replies 10 ·
Stargazing Amateur telescope eyepiece filters
- Stanwyck66
- · Replies 4 ·
Spirit in the Air and Space museum
- Blenton
- · Replies 5 ·
Graduate Dark Energy in Light of the Cosmic Horizon
- wolram
- · Replies 30 ·
Undergrad How do black hole sizes change when they accrete matter?
- danihel
- · Replies 48 ·
High School Perceiving the expansion of the universe in daily life
- query_ious
- · Replies 7 ·
Graduate Is It Possible to Create a Universe in a Laboratory?
- yoda jedi
- · Replies 1 ·
Graduate Big Bang or Big Bounce: Which Theory Explains Our Universe Better?
- Chimps
- · Replies 4 ·
Undergrad Can Time Travel Alter Our Perception of Reality?
- altairz
- · Replies 5 ·
Graduate What happens to matter falling into a black hole?
- vorcil
- · Replies 2 ·
Graduate Could black holes be overgrown quark stars?
- Tallin
- · Replies 8 ·
Graduate Universe smaller than wavelengths?
- kashiark
- · Replies 3 ·
Graduate Infinite universe filled with uniform dust
- techmologist
- · Replies 18 ·
Graduate Heisenberg uncertainty and particle creation in the early universe
- Dmitry67
- · Replies 17 ·
Graduate Could savant cognition help us intuit quantum and relativistic physics?
- GreatBigBore
- · Replies 27 ·
Graduate Modeling Light Geodesics in FLWR Metric: Trajectory and Convergence Analysis
- fab13
- · Replies 2 ·
Stargazing Buying a first telescope on a budget
- The legend
- · Replies 16 ·
Graduate Can the Universe Cause Itself to Exist from a Physics Perspective?
- celebrei
- · Replies 94 ·
Undergrad Research Topics for B.Tech Mech Engg @ ISM Dhanbad
- singh.vikas
- · Replies 2 ·
Graduate How Vast Is the Universe Beyond 50 Giga Light Years?
- GreatBigBore
- · Replies 10 ·
Undergrad An explanation for the apparent gradient of tidal amplitude with latitude?
- Doug Richard
- · Replies 1 ·
Graduate Don't even know which question to ask first
- GreatBigBore
- · Replies 37 ·
Graduate Practical possibility of Hawking radiation?
- jnorman
- · Replies 2 ·
High School Universal Gravitation: Does It Apply to Every Particle in the Universe?
- MHD93
- · Replies 2 ·
Graduate What happened before Planck time after the Big Bang?
- HarryDaniels
- · Replies 10 ·
Undergrad Does the center of the galaxy always appear brighter than the rest?
- fawk3s
- · Replies 11 ·
Undergrad How long would a human mission to L1 take?
- hhhmortal
- · Replies 5 ·
High School Does the strength of tides change between new moon and full moon?
- SASGood
- · Replies 3 ·
Graduate Where does the negative sign go in the Rayleigh-Jeans frequency-wavelength conversion?
- the riddick25
- · Replies 2 ·
Graduate Why did dark matter surprise us?
- GreatBigBore
- · Replies 14 ·
Graduate What happens to Earth's orbit if the Sun disappears instantly?
- Erick Svensso
- · Replies 12 ·
Graduate What Gave Mass to Particles After the Big Bang?
- mikhailpavel
- · Replies 1 ·
Undergrad Hello Can someone tell me what sources in the Universe produce
- Gorn
- · Replies 6 ·
Graduate Susskind's story doesn't match Krauss'?
- GreatBigBore
- · Replies 19 ·
Graduate Why can we see light from galaxies that formed 500 million years after the big bang?
- dnr
- · Replies 58 ·
Undergrad How Are Declination and Right Ascension Measured in the Celestial Sphere?
- astroboy17
- · Replies 1 ·
Graduate What is the total energy of the universe?
- Char. Limit
- · Replies 3 ·
Graduate Inflation Theory: Could There Be Other Bubble Universes?
- clm321
- · Replies 1 ·
Undergrad Star populations by spectral classes and masses
- Barnak
- · Replies 8 ·
Undergrad Star generatations making elements
- Pjpic
- · Replies 3 ·
Undergrad What Are Some Math-Focused Astrophysics Thesis Ideas?
- Ryan H
- · Replies 2 ·
High School How did we photograph the universe?
- RoyalCat
- · Replies 4 ·
Undergrad Finding the gravitational neutral point between Earth and Moon
- seanhogge
- · Replies 1 ·
Graduate Exponential expansion and Hubble constant
- Ranku
- · Replies 2 ·
Graduate Is it possible to create an artificial black hole?
- dragonfly
- · Replies 18 ·
Graduate Does a flat finite universe have a center?
- GreatBigBore
- · Replies 9 ·
Graduate Is Earth the center of the universe?
- GordonDengyo
- · Replies 24 ·
Graduate Do dark matter and dark energy exist or is gravity theory wrong?
- Minus1
- · Replies 8 ·
Graduate Earth-Sun Vector, Ecliptic to Equatorial Coordinates
- science.girl
- · Replies 3 ·
Graduate Can a universe have a beginning but be spatially infinite?
- renerob
- · Replies 41 ·
Graduate Age of Universe: Impact of Expanding Acceleration?
- daviar
- · Replies 2 ·
Undergrad Megasuns containing helium and hydrogen that were huge
- HarryDaniels
- · Replies 2 ·
Graduate Would mathematics rules be the same in sibling universes?
- matt010nj
- · Replies 4 ·
Stargazing Do gravitational anomalies occur during solar eclipses?
- ShashankX17
- · Replies 7 ·
Graduate Proportion of dark energy and dark matter
- Ranku
- · Replies 9 ·
Graduate Information is a kind of dimension (like space and time)
- alvarogz
- · Replies 5 ·
Undergrad COBE satelite strongest evidence of the big bang ?
- land_of_ice
- · Replies 3 ·
Graduate Three-Body Problem Problem ( Astronomers )
- choppu
- · Replies 16 ·
Graduate Measuring dark matter's repulsive force
- taylaron
- · Replies 36 ·
Graduate Gravitational lensing angle equation
- scupydog
- · Replies 2 ·
Graduate Supernovae Wind Shape Small Galaxies: Governato et al.
- marcus
- · Replies 1 ·
High School What do you mean by 'multi-dimensional'?
- upkiran
- · Replies 8 ·
Graduate Expansion redshift VS gravitational redshift?
- anya2
- · Replies 57 ·
Undergrad Why Is the Search for Extrasolar Planets Crucial for Humanity?
- alex.cordero
- · Replies 14 ·
Graduate General Relativity and galactic rotational speeds
- Pierre007080
- · Replies 11 ·
High School What can you see with 7x50, 15x70, or 25x100 binoculars at night sky objects?
- mjacobsca
- · Replies 20 ·
Stargazing Solar eclipse and radiation levels
- sganesh88
- · Replies 2 ·
The Known Universe Scientifically Rendered For All to See (by AMNH)
- DevilsAvocado
- · Replies 23 ·
Graduate How does the CMB interact with matter if it decoupled?
- BkBkBk
- · Replies 1 ·
Undergrad Could we redirect space debris to the Moon as a construction resource?
- salb4
- · Replies 1 ·
Graduate Is the Expansion of the Universe Making Galaxies Harder to See?
- Skolon
- · Replies 8 ·
Stargazing Solar eclipse photos from 3.2MP mobile camera - orange sphere
- sphyics
- · Replies 1 ·
High School Why do some older Hubble images have a staircase effect?
- Shilly
- · Replies 3 ·
Undergrad The firmament is not as we see it, but
- Tachyon son
- · Replies 3 ·
Graduate Do Pulsars Emit a Sonic Boom in Space?
- Bob S
- · Replies 2 ·
Graduate Mass of star as function of Luminosity, Temperature and size
- Barnak
- · Replies 9 ·