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 Constants of nature in the early universe
- windy miller
- · Replies 5 ·
Undergrad Are Cosmic Rays Intensifying Across the Globe?
- Dotini
- · Replies 4 ·
Undergrad Why does hawking radiation in black holes slowly increase?
- victorhugo
- · Replies 3 ·
Undergrad Moon revolution period 27.32, but got 27.53 from equation?
- cnnn
- · Replies 2 ·
Undergrad What would Earth's night sky look like if the entire observable universe were visible?
- rollete
- · Replies 23 ·
Undergrad What are the physical significances of eccentricity and semi-latus rectum?
- Clive Redwood
- · Replies 3 ·
Graduate Exact solutions of quintessence models of dark energy
- Diferansiyel
- · Replies 4 ·
High School Can the space (or else measurable) be actually infinite?
- Dmitri Martila
- · Replies 3 ·
High School What cancel the quantum contributions in Cosmological Const?
- cube137
- · Replies 1 ·
Undergrad Density of matter in the expanding Universe
- petrushkagoogol
- · Replies 3 ·
Undergrad "Moment of Inertia" in Virial Theorem
- throneoo
- · Replies 2 ·
High School What is beyond the edge of the universe?
- KoreanSniper0720
- · Replies 6 ·
High School The universe is shrunk a little bit more than we thought
- JDamian88
- · Replies 6 ·
High School What does a black hole look like from the inside?
- GiantSheeps
- · Replies 4 ·
Graduate Change in average atomic mass in universe through time?
- dkm0038
- · Replies 6 ·
Undergrad What would you see in an intergalactic void between galaxy clusters?
- Gary0509
- · Replies 16 ·
Undergrad Why do both expansion rate and density fine-tuning express the flatness problem?
- windy miller
- · Replies 6 ·
Undergrad Gravitational field inside a void
- Bill McKeeman
- · Replies 10 ·
Undergrad What Makes Black Holes Black and White Holes White?
- petrushkagoogol
- · Replies 41 ·
Undergrad Where is the dead star that created us?
- Sebastiaan
- · Replies 30 ·
High School Albedo, atmosphere, and predicted temperature of Venus
- Battlemage!
- · Replies 7 ·
Graduate 1st and 2nd moments of H(mu) function
- Isheteyak Zaffer
- · Replies 1 ·
Graduate Planar orbit of planets around sun
- Shubham135
- · Replies 13 ·
High School Is fusion in an accretion disk of a black hole possible?
- Irfan Nafi
- · Replies 4 ·
High School Do Atoms in Neutron Stars Touch Each Other?
- Jake52902
- · Replies 4 ·
High School Are colors in astro photos 'real'?
- Cyberspace
- · Replies 10 ·
Undergrad Why do Great Oppositions of Mars Always Happen at the Same Time of Year?
- aj gokhale
- · Replies 3 ·
Undergrad How can inhabitants of moon guess of its revolution
- aj gokhale
- · Replies 16 ·
Undergrad Default 'now' when discussing astronomical things
- Grinkle
- · Replies 6 ·
High School Question pertaining to dark energy
- Physics1218
- · Replies 34 ·
Undergrad Where galaxies are now or is there a universal 'now'?
- ebos
- · Replies 27 ·
Undergrad Some questions regarding the initial singularity
- momo666
- · Replies 4 ·
High School Why Were Planets Visible to Ancient People but Not Us?
- lucivaldo
- · Replies 40 ·
High School Why does the Great Red Spot spin counter-clockwise?
- Irfan Nafi
- · Replies 7 ·
High School Could Dark Matter Be the Fifth Fundamental Force of Nature?
- wolram
- · Replies 7 ·
Undergrad Where does the energy of the inflation field come from?
- windy miller
- · Replies 6 ·
High School Can the space to have new properties without researching?
- James Piozza
- · Replies 2 ·
Graduate What Are the Next Greatest Effects on the Moon's Motion?
- Buchanan
- · Replies 10 ·
Graduate What happens to the red dwarf during a classical nova?
- Tish62
- · Replies 4 ·
High School Can we observe events that occurred before the Big Bang?
- Mary Space
- · Replies 18 ·
Undergrad Can an infinite universe be compatible with Big Bang expansion?
- thetexan
- · Replies 17 ·
Graduate Do cosmologists take spontaneous symmetry breaking seriously?
- Carlos L. Janer
- · Replies 34 ·
Graduate Charge balance in observable universe
- Keith12345
- · Replies 10 ·
Graduate Synthetic Black Hole Event Horizon Created in UK Laboratory
- SF
- · Replies 2 ·
Stargazing Will You Be Watching the Perseid Meteor Shower?
- ProfuselyQuarky
- · Replies 49 ·
Undergrad The declination at the horizon in the east at a latitude
- Philosophaie
- · Replies 8 ·
Graduate What are the most common programming languages in astro?
- Omega Force
- · Replies 1 ·
Undergrad How is it possible for a ring singularity?
- Irfan Nafi
- · Replies 1 ·
High School Why do Perseids occur on the same date every year?
- Vrbic
- · Replies 4 ·
Undergrad Is Redshift Always Proportional to Velocity?
- JohnnyGui
- · Replies 17 ·
High School Does a gravity well's depth depend only on mass, not density?
- Dr Wu
- · Replies 6 ·
Undergrad Could Chemistry Occur in Titan's Hydrocarbon Lakes?
- Ontophobe
- · Replies 3 ·
Stargazing What telescope is best for a beginner on a budget?
- guync5
- · Replies 11 ·
High School Does LIGO detect back ground noise
- wolram
- · Replies 3 ·
High School Is the Milky Way unique or do other galaxies have these voids in their centers?
- wolram
- · Replies 5 ·
Undergrad Could gravity have an unknown multiplier effect at galactic scales?
- chaszz
- · Replies 1 ·
High School Before the big bang video series
- rootone
- · Replies 1 ·
High School How Did Light Originate After the Quark Epoch?
- Aaron1947
- · Replies 20 ·
High School Is there a such thing as being outside of our sun's gravitat
- IgnorantofPhysics
- · Replies 8 ·
Undergrad What Triggered the Big Bang Singularity's Expansion?
- Aaron1947
- · Replies 15 ·
Undergrad Hubble parameter in terms of the scale factor
- Figaro
- · Replies 22 ·
Undergrad Is the boundary of a star objective or subjective?
- Gerinski
- · Replies 4 ·
High School Could a New Field Explain Dark Matter's Role in the Universe?
- bluecap
- · Replies 3 ·
Undergrad Astronomers make first accurate measurement of oxygen in distant galaxy
- Ali Salamat
- · Replies 1 ·
High School Some more basic questions on Dark Energy
- rede96
- · Replies 1 ·
High School Is the Andromeda Galaxy Green Shifted and How is Red Shift Measured in Practice?
- Yolander
- · Replies 13 ·
Undergrad How is motion in space different than motion in spacetime?
- Pjpic
- · Replies 2 ·
High School How does the Universe's expansion relate to Newton's 1st law
- Pjpic
- · Replies 2 ·
Stargazing Telescope Design: Calculating Total Distance from Primary Mirror to Eyepiece
- Mitchell316
- · Replies 2 ·
High School Explanation of the asymmetry of the Universe
- Megnetto
- · Replies 8 ·
Graduate Venus to be humanity's next destination?
- twiz_
- · Replies 8 ·
High School What determines orbital distance and speed around a planet?
- Sveral
- · Replies 2 ·
Undergrad What Does Absolute Magnitude in the B Filter of a Distant Galaxy Refer To?
- RingNebula57
- · Replies 6 ·
High School Galaxy as massive as Milky Way emits only 1% of its light
- CygnusX-1
- · Replies 4 ·
Undergrad Why is the density infinite at the singularity?
- windy miller
- · Replies 7 ·
High School What caused the initial mass-energy distribution in the universe?
- lucivaldo
- · Replies 18 ·
Stargazing What should I observe in Southern Skies during my trip to South Africa?
- russ_watters
- · Replies 7 ·
High School What Would the Moon's Apparent Magnitude Be 1000 Times Closer?
- RingNebula57
- · Replies 17 ·
Undergrad Does superdeterminism resolve Bell's inequality loopholes?
- PhysicsClown
- · Replies 1 ·
Undergrad Focus of Earth's elliptical orbit
- avito009
- · Replies 8 ·
Undergrad Does Mass Bend Time?
- Gurjeet210
- · Replies 7 ·
Graduate Can Dark Energy be eventually infinite?
- Gerinski
- · Replies 4 ·
High School Why does dφ change to dy in the gradient equation?
- Hayden Herzberger
- · Replies 2 ·
Undergrad Is Jupiter too big to orbit the Sun?
- Oganesson
- · Replies 5 ·
Undergrad How can quasars change brightness in days if they're light-years across?
- Phys12
- · Replies 8 ·
Undergrad How do I convert the number of efolds to conformal time during inflation?
- Xepto
- · Replies 3 ·
Graduate Textbooks on orbital mechanics and computational tools for satellite navigation
- Matter_Matters
- · Replies 7 ·
Undergrad How can the integral be rewritten using a change of variables?
- Lapidus
- · Replies 1 ·
High School Hubble flow and velocity addition
- Stephanus
- · Replies 2 ·
Undergrad Rotation curves of galaxies as a function of isolation.
- WCOLtd
- · Replies 12 ·
Undergrad First atmospheric spectroscopy of Earth-sized exoplanets
- mfb
- · Replies 3 ·
Graduate What is the genesis of quantum foam, Planck constant, and string theory?
- lucivaldo
- · Replies 2 ·
Undergrad Difference between hubble sphere,particle horizon and event
- Figaro
- · Replies 11 ·
Undergrad What is the significance of the cosmological jerk in the expanding universe?
- Ontophobe
- · Replies 5 ·
Undergrad Can we avoid infinity in cosmological models of the universe's beginning?
- windy miller
- · Replies 13 ·
Stargazing Building a radio telescope that produces images
- jamalkoiyess
- · Replies 12 ·
Undergrad Where do high energy background photons go?
- fxdung
- · Replies 10 ·
Undergrad 3D map of the universe validates Einstein's theories
- Tom.G
- · Replies 1 ·
Undergrad Can Unification of Forces Coexist with an Eternally Inflating Universe?
- Ranku
- · Replies 9 ·
High School Where Can I Find Math for Black Hole Firewalls?
- MrPhysicsGuy
- · Replies 3 ·