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
High School Will identical radio telescopes detect the same cosmic background noise pattern?
- dom_quixote
- · Replies 13 ·
Undergrad Would there be any way to avoid gravitational wave emissions?
- Suekdccia
- · Replies 4 ·
Undergrad Role of Dark Matter in the Evolution of Large Scale Structure
- hkyriazi
- · Replies 9 ·
Undergrad Why did Venus lose its water while Earth kept its atmosphere?
- stuartmacg
- · Replies 1 ·
High School More Evidence for MOND -- Globular cluster galactic acceleration imprint
- ohwilleke
- · Replies 1 ·
Undergrad Does the Cosmological Principle in any way underpin Big Bang Theory?
- hkyriazi
- · Replies 33 ·
Undergrad "Quasar clocks" and time running slower long ago
- hkyriazi
- · Replies 9 ·
Undergrad The theoretical basis for a hot Big Bang?
- hkyriazi
- · Replies 7 ·
Undergrad Seeking Visualization Tools for Hypothetical Black Hole Concept
- andrefff1
- · Replies 2 ·
Undergrad Ancient galaxies: lack of mergers vs. subsequent spatial expansion
- hkyriazi
- · Replies 5 ·
Undergrad Obtaining Transit Spectrum for Celestial Bodies Using JWST NIRSPEC
- starryexplorer
- · Replies 3 ·
Graduate How to convert mW/m^2 to W/m^2/nm?
- AdrianD
- · Replies 11 ·
Undergrad Cosmological red shift and cosmic time dilation
- andrew s 1905
- · Replies 6 ·
Undergrad What is the accuracy of parking spacecraft into Lagrange points?
- RobbyQ
- · Replies 9 ·
Undergrad Entropy reversal in an infinite static universe?
- Suekdccia
- · Replies 1 ·
Undergrad Longest day of the year is June 21 but longest daylight is June 26?
- gary350
- · Replies 4 ·
High School What does it mean to say the Universe is the same everywhere?
- bahamagreen
- · Replies 8 ·
Graduate Advice needed for exposure time computation for galaxies
- AdrianD
- · Replies 2 ·
Undergrad DeSitter cosmological horizon stability?
- Suekdccia
- · Replies 3 ·
Undergrad Bolide observed across Gulf Coast on July 14 2023
- swampwiz
- · Replies 1 ·
Undergrad Could entropy be reversed eventually in the far future?
- Suekdccia
- · Replies 9 ·
Undergrad Error in Euler angles and quaternions
- jonagad
- · Replies 1 ·
High School How can a single Big Bang be true?
- Joshua10
- · Replies 20 ·
Undergrad Without degeneracy, when would Solar cores collapse?
- Ken G
- · Replies 109 ·
Stargazing Question about my photos of a Full Moon -- What is this point of light?
- Graham 1956
- · Replies 5 ·
High School Can BepiColombo Detect Microbial Life on Mercury?
- Astrodome123
- · Replies 2 ·
Undergrad Lines of stars that we see in the sky
- sophiecentaur
- · Replies 26 ·
Undergrad Einstein, Friedman and the cosmological constant
- Jaime Rudas
- · Replies 5 ·
Undergrad James Webb telescope calibration
- Mordred
- · Replies 16 ·
Graduate Largest Galaxy In An Infinite Universe
- Hornbein
- · Replies 12 ·
Undergrad Does cosmic expansion affect the time dimension like it affects space?
- exander
- · Replies 22 ·
Undergrad Mass measurement of galaxies with non-gravitational means
- Ranku
- · Replies 14 ·
Graduate Does Kinney et al.'s extension of the BGV theorem require a cosmic singularity?
- Luis Mijares
- · Replies 2 ·
High School Beware of "truthiness" in astronomy in seemingly reliable websites
- Ken G
- · Replies 21 ·
Undergrad Which one is Antares in this photo?
- swampwiz
- · Replies 7 ·
High School Why did Einstein introduce the cosmological constant in 1915?
- Jimmy87
- · Replies 19 ·
Graduate Evolution of radio sources mimics a non-expanding universe
- member 673059
- · Replies 1 ·
Undergrad Distinguishing between the effects of dark matter and MOND
- Ranku
- · Replies 40 ·
Undergrad Release of trapped light during supernova
- jml53
- · Replies 8 ·
Undergrad New research puts age of the Universe at 26.7 billion years
- pinball1970
- · Replies 6 ·
High School The Sun's Influence on the Moon's Orbit: Is it Negligible?
- LesRhorer
- · Replies 4 ·
Undergrad Gravity assist requires a third massive body
- LesRhorer
- · Replies 86 ·
Undergrad Circular polarization and linear polarization of pulsars
- ZX.Liang
- · Replies 1 ·
Undergrad Spectral class temperature range
- snorkack
- · Replies 9 ·
Undergrad Velocity of a given planet relative to the Galactic Center
- Entropix
- · Replies 22 ·
Undergrad Is anything not spinning in the Universe?
- Tate
- · Replies 2 ·
High School How can the universe have an age if time began at the big bang?
- KobiashiBooBoo
- · Replies 22 ·
High School The fastest spinning and possibly the youngest magnetar known
- lomidrevo
- · Replies 1 ·
Undergrad NANOGrav results on Thursday (June 29)
- mfb
- · Replies 8 ·
Undergrad What is theorized to be the coldest white dwarf in the Universe?
- swampwiz
- · Replies 27 ·
Undergrad Solar internet problems in 2025?
- bigvuth
- · Replies 2 ·
High School Cosmological time dilation of high-redshift quasars
- Cerenkov
- · Replies 8 ·
Stargazing Inquiry Regarding Hypothetical Faster-Than-Light Travel Scenario
- sushilreang
- · Replies 2 ·
Graduate Low-frequency gravitational waveforms detected by IPTA
- Sware
- · Replies 6 ·
High School Expanding Universe -- What is it expanding into?
- jwaldo
- · Replies 20 ·
Undergrad Testing for dark energy using the Local Group
- member 673059
- · Replies 1 ·
Undergrad Could a planet be an oblate ellipsoid with three different axes?
- Ben2
- · Replies 7 ·
Undergrad How to find Heliocentric latitude data for each planet?
- Mikael17
- · Replies 9 ·
Undergrad astrophysics breakthroughs in fusion and supernova experiments
- swampwiz
- · Replies 9 ·
High School Questions about Supermassive stars in the Milky Way Galaxy
- BWV
- · Replies 6 ·
Undergrad Could it be that the Big Bang had no cause?
- donglepuss
- · Replies 3 ·
Undergrad Any evidence of white holes in the Universe?
- Slavik Komarova
- · Replies 15 ·
Undergrad Is there any way in the future to determine the Universe's size?
- Maximum7
- · Replies 58 ·
Undergrad How is there any pressure at all in isotropic radiation?
- phyTens
- · Replies 20 ·
Graduate Mass density of radiation in Friedmann equation?
- darkdark10
- · Replies 6 ·
High School Has Earth Lost Its Status as a Planet?
- DaveC426913
- · Replies 24 ·
Undergrad Star with quadrupole in a binary system violates Newton's 3rd Law?
- andromeda123
- · Replies 4 ·
High School What is a parsec and how is it measured?
- dnl117
- · Replies 7 ·
Undergrad Measuring the Velocities of Astronomical Objects in the Milky Way
- Al-Layth
- · Replies 11 ·
Undergrad What keeps dark matter in galactic halos?
- Dennis Plews
- · Replies 26 ·
High School Glimpsing Orion's Setting in the Western Sky
- neilparker62
- · Replies 8 ·
Undergrad Comet Bernardinelli-Bernstein enters inner solar system
- fresh_42
- · Replies 1 ·
Undergrad Early Catalog of Planet-Hosting Multiple Star (≥ 3) Systems
- Astronuc
- · Replies 3 ·
Undergrad Gravity inside an exponential mass disk
- independentphysics
- · Replies 16 ·
High School Is the Universe's age 13.7B years in a particular frame?
- Devin-M
- · Replies 19 ·
High School Saturn's 62 new moons bring total to 145, reclaiming moon king title
- Astronuc
- · Replies 16 ·
Undergrad What are the conditions under which stars can radiate coherent light?
- ZX.Liang
- · Replies 29 ·
Stargazing Asteroid filmed over the English Channel
- pinball1970
- · Replies 2 ·
Undergrad Developing Inflation Theory w/o Dark Energy: Alan Guth 1980
- Aromalsp
- · Replies 1 ·
High School When Would Planets Go Dark if the Sun Went Out?
- mopc
- · Replies 2 ·
High School What caused the recent supernova in the Pinwheel Galaxy?
- swampwiz
- · Replies 4 ·
Undergrad Are red supergiants young stars evolving into blue giants?
- Thecla
- · Replies 5 ·
High School How can the Universe be flat? Ridiculous
- JackB123
- · Replies 13 ·
Undergrad Is Penrose's Cyclic Cosmology Model Only Applicable on a Local Scale?
- PAllen
- · Replies 5 ·
High School How does gravity's warping of spacetime appear first among the forces?
- syfry
- · Replies 1 ·
Undergrad Where can I find publicly accessible data from observatories in Europe?
- GucciPotlood
- · Replies 5 ·
High School At what distance would a Venus-like planet have a HZ temperature?
- xpell
- · Replies 14 ·
Undergrad The curvature and size of the Universe
- Jaime Rudas
- · Replies 36 ·
High School What would Sol look like in the night sky from Alpha Centauri?
- swampwiz
- · Replies 15 ·
High School How bright is the Sun compared to the sky?
- LightningInAJar
- · Replies 17 ·
Graduate Updated Hubble constant from TRGB measurements
- member 673059
- · Replies 4 ·
High School What Would Happen to the Elements in the Human Body If Teleported to the Sun?
- ds442
- · Replies 3 ·
Graduate Is M_{Pl} the Planck mass or the reduced Planck mass?
- Alpha2021
- · Replies 5 ·
High School What's a good website for aurora forecasts?
- swampwiz
- · Replies 5 ·
Undergrad Was Electroweak Symmetry Breaking in the Early Universe Controversial?
- Hornbein
- · Replies 28 ·
Undergrad Can fundamental symmetries emerge from a topological phase transition?
- Suekdccia
- · Replies 3 ·
Undergrad What Could Cause the Earth's Rotation to Dramatically Slow Down?
- garymc11
- · Replies 39 ·
High School Can I see the same constellation south of Sydney and Cape Town at the same local time?
- Ken Osbourne
- · Replies 7 ·
High School Celestial objects in the very far future
- KingGambit
- · Replies 11 ·
Undergrad Accuracy of the L ∝ AT^4 formula for stellar luminosity
- Chem10
- · Replies 11 ·