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 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 Time Dimensions: Astronomy & Beyond
- DaveC426913
- · Replies 13 ·
Graduate Cosmic Tidal Force: Measuring CTF With Strain Gauge
- Jorrie
- · Replies 61 ·
High School So what's your go-to method to locate M31 (Andromeda Galaxy)?
- swampwiz
- · Replies 13 ·
High School Nodal Precession: Satellites Orbiting Earth Explained
- 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 Amazing Rings: Intersecting Stars Create Spectacular Gas Rings
- 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 A pair of interesting papers: have counterarguments 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 Question about the William Herschel Telescope's new "Weave" device
- phinds
- · Replies 3 ·
Undergrad What is the significance of slow-roll inflation in cosmology?
- AHSAN MUJTABA
- · Replies 1 ·
Undergrad JWST breaks another Redshift record
- 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 Help me on the timeline of star formation in the early Universe
- 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 Paradox: How can we look back at the Big Bang?
- 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 Help with Sunrise & Sunset formulas please
- Tomfmal
- · Replies 6 ·
Undergrad Amount of black hole entropy inside the Universe?
- bbbl67
- · Replies 5 ·
High School Question about deep space pictures
- 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 Confused by this armillary sphere in Australia
- 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 ·
High School Mars Probe gets Windows 98 Update, after 19 years
- Tom.G
- · Replies 6 ·
Undergrad Some questions about Cosmic Microwave Background radiation
- PainterGuy
- · Replies 13 ·
High School Where can I find information about Population III stars?
- Cerenkov
- · Replies 2 ·
Undergrad I have an error in integrating to calculate the age of the Universe
- Buzz Bloom
- · Replies 40 ·
High School Is it possible for a giant star to have a black hole inside it?
- Thadriel
- · Replies 11 ·
Undergrad The gravitational center of the Earth
- qnt200
- · Replies 3 ·
Undergrad How to find RAAN and argument of perigee for a satellite?
- yzma
- · Replies 1 ·
High School How often do you re-acquire dark and bias frames?
- Andy Resnick
- · Replies 1 ·
Undergrad How does the symbol Λ cosmological constant relate to Ω_Λ or ρ_Λ?
- Buzz Bloom
- · Replies 3 ·
High School Is Stellina the Ultimate Telescope for Amateur Astronomers?
- swampwiz
- · Replies 8 ·
Undergrad Voyager Spacecraft beginning to Power Down
- Tom.G
- · Replies 2 ·
Undergrad Some questions about Cosmic Inflation
- PainterGuy
- · Replies 4 ·
High School Where Can I Find Accurate Planetary Event Data for an Astronomy Course?
- brainpushups
- · Replies 5 ·
Undergrad Are there types of spacetime where no symmetries are valid?
- Suekdccia
- · Replies 15 ·
High School Has there been no update to Allen's Astrophysical Quantities since 1999?
- Jenab2
- · Replies 1 ·
Undergrad Seeking understanding regarding Ω_b, Ω_c, and Ω_m
- Buzz Bloom
- · Replies 14 ·
High School Evolution of planetary system around a white dwarf
- Astronuc
- · Replies 0 ·
Undergrad What is a typical mass density for inter-galactic gas in a cluster?
- timjdoom
- · Replies 2 ·
High School How much energy does our Universe have?
- vasiladp
- · Replies 12 ·
Undergrad Postulating a minimum gravitational field strength
- kodama
- · Replies 11 ·
Graduate What is a Bern model in planetary population synthesis?
- Fabioonier
- · Replies 9 ·
Undergrad Questions about Negative Pressure and Vacuum Energy
- darkdark10
- · Replies 5 ·