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 Orbital Velocities and Mass Distribution in Galaxies
- cosmologyscience
- · Replies 7 ·
Graduate Interactive Galactic Dynamics Textbook -- Bovy 2022
- strangerep
- · Replies 2 ·
Graduate What is the cause of lunar nodal and apsidal precession?
- fizzy
- · Replies 36 ·
High School Gas planets with solid satellites
- Jordi H
- · Replies 2 ·
High School Can gravitational force have influence on objects at infinitely long distances?
- shivakumar
- · Replies 3 ·
High School Expansion of Space Itself, rather than due to an Explosion like the Big Bang?
- thetexan
- · Replies 9 ·
Undergrad Would it be possible for a black hole to have a "solar system"?
- BHL 20
- · Replies 4 ·
High School Rosalind Franklin and Photo 51
- jedishrfu
- · Replies 3 ·
High School Distance of Stars / Size of the Universe calculation
- I0sens
- · Replies 6 ·
Undergrad Could Passing Asteroids Alter Milanković Cycles and Trigger Climate Change?
- Gulfton
- · Replies 4 ·
Undergrad Do All Galaxies with Dark Matter Halos Have Flat Rotation Curves?
- Ranku
- · Replies 32 ·
High School What is the recession speed today of the matter which created the CMBR?
- Tanelorn
- · Replies 57 ·
High School Bright streak in sky over Cornwall on 7 July 2017
- despoi1er
- · Replies 8 ·
High School Why does the moon appear tilted?
- Jackamus
- · Replies 2 ·
Undergrad Cosmic Flatness Deduced from CMB
- XilOnGlennSt
- · Replies 4 ·
Undergrad Relationship between geometry and expansion rate
- windy miller
- · Replies 7 ·
High School How's it possible that 70% of Earth receives sunlight simultaneously
- yohananregal
- · Replies 37 ·
High School Do degeneracy pressure and the Pauli exclusion principle create waves in neutron stars?
- gianeshwar
- · Replies 2 ·
High School Why is Andromeda approaching us if the universe is expanding?
- Simon Peach
- · Replies 9 ·
High School Why are so many craters on airless worlds hexagonal?
- GregM
- · Replies 13 ·
High School How Has the Calculation of Solar System Body SGPs Evolved Over Time?
- GregM
- · Replies 3 ·
High School Why are impact craters predominantly circular?
- Sanborn Chase
- · Replies 27 ·
Undergrad LightCone Calculator Improvements
- Jorrie
- · Replies 100 ·
Undergrad Identification of matter and dark matter proportions
- Ranku
- · Replies 23 ·
Undergrad Interpreting solar event flux units
- SteveA001
- · Replies 8 ·
High School Do you need two time coordinates to locate a star?
- DaveC426913
- · Replies 13 ·
Graduate Measuring cosmological tidal force with a strain gauge
- Jorrie
- · Replies 61 ·
High School So what's your go-to method to locate M31 (Andromeda Galaxy)?
- swampwiz
- · Replies 13 ·
High School Why does Earth's equatorial bulge cause nodal precession if gravity is weaker there?
- Sphere
- · Replies 22 ·
Stargazing Fixing declination runaway on a Meade LX200 telescope
- collinsmark
- · Replies 6 ·
Graduate Multiverse and observational evidence?
- apostolosdt
- · Replies 10 ·
Insights Intro to Big Bang and Infinity Concepts - Comments
- Arman777
- · Replies 62 ·
High School Spatial Expansion -- Coincidence?
- stuart100
- · Replies 6 ·
High School What would the planets look like in real life?
- Nathi ORea
- · Replies 17 ·
Undergrad Mining the Universe's expansion?
- Suekdccia
- · Replies 25 ·
Graduate On the origin and the evolution of information in the Universe
- Rene Kail
- · Replies 1 ·
Undergrad Receding movement of a stopped object in an accelerating universe?
- Suekdccia
- · Replies 23 ·
Undergrad Lectures on the Varying fine structure constant
- Conn_coord
- · Replies 7 ·
Undergrad Cosmic strings increasing internal energy?
- Suekdccia
- · Replies 1 ·
Undergrad How accurate is the distance to M4 and its stars according to different sources?
- snorkack
- · Replies 2 ·
High School Concentric gas rings from nearly intersecting stellar orbits
- Hornbein
- · Replies 6 ·
Graduate Is the FLRW Metric a Valid Approximation for Our Universe on Large Scales?
- Tanujhm
- · Replies 7 ·
High School The value of the standard acceleration due to Earth's gravity
- Sphere
- · Replies 10 ·
Graduate Non-minimally coupled inflation — expansion
- svenz706
- · Replies 1 ·
Undergrad What is the temperature dependence of the NIRCam sensor's responsivity?
- Devin-M
- · Replies 70 ·
Graduate Have counterarguments to Kroupa's dark matter tests been published?
- PeterDonis
- · Replies 10 ·
High School Understanding the Expansion of Space: Galaxies Moving Away and Proving Expansion
- Richard lanning
- · Replies 78 ·
Undergrad How Does Space Expansion Affect the Velocity of Galaxies?
- Martyn Arthur
- · Replies 65 ·
High School Could a black hole just be a planet?
- JLemp
- · Replies 6 ·
Undergrad Distant Galaxy study, dark matter and the CMBR
- pinball1970
- · Replies 1 ·
High School Celestial mechanics: Why is my planet orbiting faster and faster?
- S Holtom
- · Replies 22 ·
Undergrad What Equation Determines the Cosmic Event Horizon Distance?
- Jay B
- · Replies 7 ·
High School Could the source of dark energy be our parent black hole feeding?
- Bob Walance
- · Replies 6 ·
Undergrad Upper limit of relativistic spin?
- BWV
- · Replies 7 ·
Undergrad Can we see light pollution from space?
- LightningInAJar
- · Replies 7 ·
Undergrad Does all infrared get detected as heat?
- LightningInAJar
- · Replies 22 ·
High School What does relativity say about wormholes?
- Gear300
- · Replies 11 ·
Undergrad Gas Density of Lunar Crater Rims: Comet vs. Asteroid Impacts
- snorkack
- · Replies 3 ·
Undergrad How significant are observations with the William Herschel Telescope's Weave device?
- phinds
- · Replies 3 ·
Undergrad What is the significance of slow-roll inflation in cosmology?
- AHSAN MUJTABA
- · Replies 1 ·
Undergrad JWST confirms galaxy at redshift z=16.7, 250 million years after big bang
- Oldman too
- · Replies 2 ·
High School Could a Galaxy Older than 13.8 Billion Years Redefine Cosmology?
- Jupiter60
- · Replies 4 ·
Graduate Is the Universe Finite, or Is It Infinite?
- Greg Bernhardt
- · Replies 27 ·
Undergrad Is the Bullet Cluster Evidence for or Against Dark Matter?
- accdd
- · Replies 7 ·
Undergrad Spectroscopy of GLASS-z13 and heavy elements 300 million years after the Big Bang
- BWV
- · Replies 2 ·
Stargazing How can we see the ISS at 200 miles away with the naked eye?
- TruthSeeker777
- · Replies 80 ·
Undergrad Voyager I and Voyager II informative video
- Tom.G
- · Replies 0 ·
Undergrad Starlink and gaining energy from orbiting
- planck999
- · Replies 4 ·
Undergrad Could a bubble shield at L1 combat global warming?
- swampwiz
- · Replies 18 ·
High School Effect of JWST mirror damage on final images
- GhostLoveScore
- · Replies 1 ·
Undergrad What do high-mass X-ray binaries, or HMXBs, tell us?
- Astronuc
- · Replies 1 ·
Undergrad How to calculate an unknown planet's orbital period?
- NODARman
- · Replies 1 ·
Undergrad A glitch in Jorrie’s Cosmo-Calculator?
- JimJCW
- · Replies 152 ·
Undergrad How can we observe the Big Bang if light from it hasn't reached us yet?
- GreenWombat
- · Replies 31 ·
High School What Is the Information That Cannot Escape a Black Hole?
- brendanxx
- · Replies 3 ·
Undergrad Solar system simulation errors
- madsmh
- · Replies 19 ·
Undergrad Sunrise and sunset formulas from day, longitude and latitude
- Tomfmal
- · Replies 6 ·
Undergrad Amount of black hole entropy inside the Universe?
- bbbl67
- · Replies 5 ·
High School Can we predict the current state of distant galaxies observed by JWST?
- gleen41
- · Replies 3 ·
Undergrad Question re flat infinite universe with a preferred direction
- Buzz Bloom
- · Replies 5 ·
Undergrad What is the density of the Carina Nebula?
- ozipin
- · Replies 5 ·
Undergrad Why is the observed local region of space flat?
- PainterGuy
- · Replies 25 ·
Undergrad A new solution to Olbers' Paradox?
- John_RB
- · Replies 20 ·
Undergrad Is the eccentricity of the lunar orbit constant?
- Orthoceras
- · Replies 2 ·
Undergrad Armillary sphere in Australia shows zones on wrong sides
- swampwiz
- · Replies 4 ·
High School Temporal differences across a galaxy?
- narrator
- · Replies 6 ·
Undergrad Mass distribution in a celestial system
- Ranku
- · Replies 6 ·
Undergrad Earth's orbit not perfect ellipse
- Delta2
- · Replies 19 ·
Undergrad SpaceX says 5G expansion would make Starlink 'unusable' for most Americans
- berkeman
- · Replies 4 ·
Undergrad Reheating and the horizon problem - chicken and egg?
- GeorgeDishman
- · Replies 6 ·
Graduate From polar coordinates to heliocentric ecliptic coordinates
- Shukie
- · Replies 1 ·
Graduate Can the Universe's Expansion Allow Us to Escape Its Event Horizon?
- daveb
- · Replies 1 ·
High School Big Bang Question -- How was the first matter formed?
- MagneticMagic
- · Replies 69 ·
Graduate How are time and distance measured in cosmology?
- Greg Bernhardt
- · Replies 1 ·
Graduate What is the total mass-energy of the universe?
- Greg Bernhardt
- · Replies 1 ·
Undergrad The curvature of space and curvature of spacetime
- PainterGuy
- · Replies 21 ·
High School Can nuclear bomb(s) change trajectory of small black hole?
- eggchess
- · Replies 19 ·
Undergrad Bubble universes and physical constants
- JuneSpring25
- · Replies 8 ·
High School SOFIA IR Observatory in the Southern Sky
- Baluncore
- · Replies 8 ·
Undergrad Why are Saturn's rings in its equatorial plane?
- KurtLudwig
- · Replies 3 ·