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 What is the difference between collisionless and self-interacting dark matter?
- Ranku
- · Replies 1 ·
High School Is Your Rock a Real Meteorite or a Common Meteorwrong?
- Patel het
- · Replies 9 ·
Undergrad Question on the horizon problem
- Nikolai01
- · Replies 17 ·
Undergrad What is the probability of life on exopanet LHS475b?
- NOSYLA
- · Replies 15 ·
High School Long strings theory and cosmic expansion
- Conn_coord
- · Replies 5 ·
Undergrad Expansion-Collapse cycle in cosmological structures?
- Suekdccia
- · Replies 1 ·
Undergrad Local dark matter distribution
- Frabjous
- · Replies 14 ·
Graduate Has the merger of a neutron star and an anti-neutron star been modeled?
- Cato
- · Replies 4 ·
Graduate Does the gravitational rate of acceleration increase within a planet?
- sjbauer1215
- · Replies 54 ·
High School Does Ceres ever transit Jupiter?
- zuz
- · Replies 1 ·
Undergrad Could a maglev catapult on the moon reduce fuel needs for Mars missions?
- darkdave3000
- · Replies 9 ·
Undergrad Why does Halley's Comet still exist if it keeps sublimating?
- hexanol
- · Replies 6 ·
Undergrad Can Electromagnets Propel Starship Orion Using Nuclear Explosions?
- darkdave3000
- · Replies 17 ·
High School Data needed - Related bodies and their stats
- ForTheLoveOfPhysics
- · Replies 5 ·
Undergrad Successful predictions from anthropics? (History of science question)
- windy miller
- · Replies 11 ·
High School Projected linear separation between companion stars
- guv
- · Replies 14 ·
Undergrad Is it possible to unbind a neutron star?
- Cato
- · Replies 2 ·
Stargazing Can Stars Be Spaghettified in a Matter of Days by Black Holes?
- Gear300
- · Replies 17 ·
Undergrad How much better is HabEx going to be relative to Webb?
- swampwiz
- · Replies 4 ·
Undergrad Measuring the rotation curve of galaxies
- accdd
- · Replies 1 ·
High School Does Roger Penrose's Big Bang cyclic-universe thing make sense?
- HomesliceMMA
- · Replies 5 ·
High School Is there any kind of anti-matter "problem"?
- HomesliceMMA
- · Replies 1 ·
High School Why so many want, or are not disturbed by, a "deterministic" universe?
- HomesliceMMA
- · Replies 10 ·
Undergrad Hubble flow kinetic energy into other types of energy?
- Suekdccia
- · Replies 2 ·
Undergrad How far away are stars in a typical star cluster from each other?
- swampwiz
- · Replies 12 ·
Graduate Presentation: Venus hot break hypothesis
- Andre
- · Replies 1 ·
High School Is there a theoretical size limit for a planet?
- sushi b
- · Replies 39 ·
Undergrad What is the luminosity of Earendel?
- swampwiz
- · Replies 1 ·
Graduate Expression of Shot noise when expanding ##a_{\ell m}## coefficients
- fab13
- · Replies 2 ·
High School Is the Universe really infinite?
- Chunkythunk
- · Replies 11 ·
High School Could Dark Matter/Energy be the byproduct of annihilation?
- Jake_w1044
- · Replies 4 ·
High School Do Satellites and the ISS Use Power to Maintain Attitude Control?
- berkeman
- · Replies 5 ·
Undergrad Can gravitational waves gain energy in an expanding FRW spacetime?
- Suekdccia
- · Replies 3 ·
High School How did the universe start and evolve into what it is today?
- HomesliceMMA
- · Replies 24 ·
Undergrad Jupiter appearing flashy - red on top, blue bottom
- bahamagreen
- · Replies 49 ·
High School Could Nuclear Powered Bulldozers Create a Habitable Cavity for a Mars Colony?
- darkdave3000
- · Replies 17 ·
High School Why the expansion after the "Big Bang" is showed in cylindrical form?
- crakedhead
- · Replies 2 ·
Graduate Temperature of HII Gas: Intuitive Explanation
- zviz
- · Replies 3 ·
High School Size of universe - rewinding big bang versus "flat" universe
- HomesliceMMA
- · Replies 54 ·
Stargazing Is the DWARF II a Viable Astroscope?
- DaveC426913
- · Replies 26 ·
High School How did Earth get so far away from other galaxies?
- Gaylan Larson
- · Replies 12 ·
Undergrad What is Brian Austin Green talking about here?
- HomesliceMMA
- · Replies 2 ·
Graduate Does WHIM solve the dark matter problem?
- fabinuk
- · Replies 1 ·
Undergrad Conservation of energy in quasar outflows?
- Suekdccia
- · Replies 4 ·
Undergrad Why are Saturn's moons so bright?
- Amaterasu21
- · Replies 2 ·
High School Where Are the To-Scale Diagrams of Alpha Centauri's Orbits?
- Warp
- · Replies 47 ·
High School Meteor detection/prediction: One over Toronto, ON, Canada
- Astronuc
- · Replies 5 ·
Stargazing Join the occult (Dec. 7th/8th, Moon will occult Mars.)
- collinsmark
- · Replies 2 ·
High School What would Neptune look like from 1 million kilometers away?
- Omega0
- · Replies 8 ·
Graduate How Did Scientists Calculate the Orbital Radius of Jupiter's Moons?
- Forcino
- · Replies 5 ·
Undergrad What does zero-order mean in cosmology?
- shirin
- · Replies 2 ·
High School Dark Energy, Dark Matter and the Speed of Light
- mpross
- · Replies 23 ·
Undergrad Hubble Parameter as function of time in universe models
- timmdeeg
- · Replies 8 ·
Graduate Understanding 3D Doppler Shift with Satellites
- Alia_3
- · Replies 4 ·
High School Highschool Student Struggling to Understand Doppler Effect Paper
- inspacewithcallisto
- · Replies 2 ·
Undergrad Have you seen the JWST Observing Schedule?
- FactChecker
- · Replies 1 ·
Undergrad Why does the core collapse happen so fast in a supernova?
- rnielsen25
- · Replies 3 ·
Undergrad Gravitational binding energy of the sun?
- Researcher X
- · Replies 1 ·
Undergrad Can a Satellite Maintain its Angular Velocity with Continuous Low Thrust?
- dansmith170
- · Replies 2 ·
High School Does a contracting universe destroy its black holes?
- fhenryco
- · Replies 29 ·
Graduate Diffraction Effects and Artifacts in Telescopes like the JWST
- collinsmark
- · Replies 125 ·
Undergrad Avoiding heat death in an accelerated expanding universe?
- Suekdccia
- · Replies 2 ·
Undergrad What processes eject material during star formation?
- anorlunda
- · Replies 2 ·
Undergrad Tides on a nearly tidally locked planet
- Althistorybuff
- · Replies 9 ·
Undergrad How to interpret this new Keck spectrum picture of Jupiter?
- Dave Gungan
- · Replies 13 ·
Undergrad Internal energy of a comoving volume increasing as space expands?
- Suekdccia
- · Replies 20 ·
Undergrad Methods for energy harvesting in expanding universe?
- Suekdccia
- · Replies 5 ·
High School Hydrostatic pressure in a bottle of water on ISS
- Induana
- · Replies 21 ·
High School Communication Options With Future Deep Space Probes?
- Devin-M
- · Replies 66 ·
Undergrad What would the universe look like from different spatial reference frames?
- KobiashiBooBoo
- · Replies 37 ·
Undergrad Is the Cosmological Constant Problem a Misunderstanding of Zero-Point Energy?
- AndreasC
- · Replies 92 ·
High School Would the Giant Arc be visible from a hypothetical exoplanet?
- Maximum7
- · Replies 11 ·
Graduate Coefficient correlation between 2 cosmological probes
- fab13
- · Replies 2 ·
Undergrad How can we know the current size and galaxy count of the universe?
- amorphos_b
- · Replies 5 ·
Undergrad Deviations of conservation laws in cosmological evolution?
- Suekdccia
- · Replies 2 ·
High School Age of the universe vs observable distance and light age
- amorphos_b
- · Replies 11 ·
Undergrad How many apparent horizons could the Universe have?
- Suekdccia
- · Replies 12 ·
Undergrad Sachs-Wolfe effect in a Dark Energy universe?
- Suekdccia
- · Replies 1 ·
High School Light element abundances for He3/H?
- Aidyan
- · Replies 1 ·
High School Ivuna meteorite from edge of solar system to Tanzania?
- Astronuc
- · Replies 8 ·
High School Would light travel in a circle at the edge of the observable Universe?
- Devin-M
- · Replies 19 ·
Undergrad Can there be some kind of photon emission caused by space expansion?
- Suekdccia
- · Replies 4 ·
High School Can physical constants be different in other galaxies?
- Gerenuk
- · Replies 26 ·
High School How hot is the Sun in space? (James Webb related)
- brajesh
- · Replies 25 ·
High School Could there be macro objects out there that convert energy to mass?
- Feynstein100
- · Replies 15 ·
High School Possible to see the moons of Jupiter/Saturn with decent set of binoculars?
- Alltimegreat1
- · Replies 20 ·
High School Gravitomagnetic explanation of Dark Matter
- DaveC426913
- · Replies 7 ·
Undergrad Data Showing Dark Matter Is Not Cold Neutrinos?
- Geonaut
- · Replies 13 ·
Undergrad Jansky: When Physics Majors Should Expect It
- strangerep
- · Replies 5 ·
Stargazing ATLAS observations of the DART spacecraft impact at Didymos
- davenn
- · Replies 1 ·
Undergrad Database of binary star data info within 10 PC of Earth
- Sciencemaster
- · Replies 5 ·
Undergrad Can I Find Alternative Eyepieces for My Quantum 5 Binocular?
- geggen
- · Replies 2 ·
Undergrad Kepler orbits for planets of similar masses
- jaumzaum
- · Replies 2 ·
High School Where is General Relativity Applied and When Does the Oblate Earth Matter?
- Gear300
- · Replies 5 ·
Undergrad Why Do Galaxies Spin and What Drives Their Motion?
- Trying2Learn
- · Replies 53 ·
Stargazing Why does the asteroid Dimorphos leave a trail after impact?
- tech99
- · Replies 1 ·
Undergrad Cosmic Event Horizon – Does it have any real effects?
- JimJCW
- · Replies 9 ·
Undergrad What are the possible states of cold iron balls?
- PAllen
- · Replies 2 ·
Undergrad Particle production in an expanding universe?
- Suekdccia
- · Replies 6 ·
Undergrad Is energy conserved during the formation of local systems?
- Suekdccia
- · Replies 2 ·