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 Schwartzchild radius and the Big Bang
- saltburnman
- · Replies 13 ·
Undergrad What happens to a small star after burning all of its fuel?
- kelly0303
- · Replies 3 ·
High School Some historic remarks on astrometry by Terence Tao
- fresh_42
- · Replies 2 ·
Undergrad IRAS Filter Profile: Computing ##\lambda_{mean}##
- tryingtolearn1
- · Replies 4 ·
Undergrad Reason for matter rather than antimatter?
- jcap
- · Replies 4 ·
High School Phys.org - Carbon creation finding set to rock astrophysics
- Astronuc
- · Replies 1 ·
Undergrad Preprocessing FIT Files to Bias and Flat Correction Using Python Script
- tryingtolearn1
- · Replies 7 ·
Undergrad What space geometry is used for cosmological distributions?
- Stephen Tashi
- · Replies 1 ·
Undergrad Black Hole Event Horizon Hypothesis
- yotta
- · Replies 6 ·
Undergrad Qs re the behavior of atoms after decoupling completed
- Buzz Bloom
- · Replies 1 ·
Undergrad Which will be brighter when it supernovas - Eta Carinae or Betelgeuse?
- swampwiz
- · Replies 2 ·
Graduate Confusion in Angular diameter distance
- Arman777
- · Replies 4 ·
Undergrad Can light escape from black holes if Hawking radiation exists?
- LightningInAJar
- · Replies 4 ·
Graduate Are topological defects such as domain walls really discontinuous?
- fhenryco
- · Replies 2 ·
High School Why is an inverse logarithmic scale chosen for the magnitudes of stars?
- TheCelt
- · Replies 3 ·
Stargazing Observations and telescope/microscope design questions
- homerwho
- · Replies 5 ·
Undergrad Can LIGO Detect Gravity Waves from Directly Above or Below?
- Bern1937
- · Replies 2 ·
Undergrad Red shift / Blue Shift - Gravity Well Roundtrip
- D.S.Beyer
- · Replies 2 ·
Undergrad What is the density of hydrogen atoms in the Universe?
- Buzz Bloom
- · Replies 3 ·
High School What is the relative speed of two groups of quasars with different redshifts?
- CosmologyHobbyist
- · Replies 2 ·
Undergrad Apparent distance to far galaxies
- gptodd
- · Replies 2 ·
High School There's Gold in Them Neutron Stars - or - Maybe Not
- jedishrfu
- · Replies 5 ·
Undergrad Object in or out of a circular field of view? (celestial coordinate system)
- vladivostok
- · Replies 4 ·
High School Could a coronal mass ejection be seen during a total solar eclipse?
- swampwiz
- · Replies 11 ·
Undergrad Is a Robust Estimate of Tau Ceti 'f' Albedo Possible?
- Nik_2213
- · Replies 3 ·
Undergrad Rotation rates of planets seem odd?
- JLT
- · Replies 10 ·
High School Measuring distance between two stars in a binary system
- TheCelt
- · Replies 10 ·
High School Is there a forum where people can share and discuss features on Mars?
- Jarvis323
- · Replies 56 ·
Graduate Experimental test of shrinking matter theory?
- jcap
- · Replies 42 ·
Undergrad Multiple Universes Coming into Contact
- saddlestone-man
- · Replies 2 ·
Undergrad Converting "Luminosity per unit wavelength" to "Luminosity per unit frequency"
- Lizard
- · Replies 1 ·
Undergrad Question Regarding Determining the Mass of Venus
- astropi
- · Replies 2 ·
Undergrad What powers the quasar magnetic beams that power jets?
- CosmologyHobbyist
- · Replies 3 ·
Undergrad Material source of the quasar redshift
- CosmologyHobbyist
- · Replies 5 ·
Undergrad Mars craters at 58°N 58°E and 70°N 352°E
- CosmologyHobbyist
- · Replies 14 ·
High School Is the Big Bang only about the observable Universe?
- kuartus4
- · Replies 6 ·
Undergrad What kind of matter formed Primordial Blackholes?
- Mlesnita Daniel
- · Replies 4 ·
Undergrad New Hubble Paper On Lensing In Galactic Clusters
- ohwilleke
- · Replies 2 ·
High School Questions about the Curvaton particle
- windy miller
- · Replies 5 ·
High School What is the definition of a black hole?
- JoeyJoystick
- · Replies 27 ·
Undergrad Why does 360×180 not equal the total sky area in square degrees?
- Phys12
- · Replies 11 ·
High School Finding the present day distance to a galaxy
- tovisonnenberg
- · Replies 1 ·
Undergrad What happens if a strangelet falls in to a black hole?
- Foxy
- · Replies 1 ·
Stargazing Apparent vs actual position of stars
- Dmstifik8ion
- · Replies 16 ·
Graduate Accelerated Hubble expansion -- Is the second derivative positive?
- The Count
- · Replies 17 ·
High School How can time flow backwards if events always happen sequentially?
- thegroundhog
- · Replies 51 ·
Stargazing Sun observation (Gregor / Teneriffa)
- fresh_42
- · Replies 10 ·
Undergrad Effect of Dark Matter on fast moving bodies
- Thomas Sturm
- · Replies 10 ·
High School Does tidal bulge lead angle approach zero as Earth rotation slows?
- Swamp Thing
- · Replies 4 ·
High School Did atoms expand as the universe expanded?
- Kuni
- · Replies 14 ·
Undergrad Remains of collapsed stars as touching binary planets?
- dconnell
- · Replies 3 ·
Stargazing Possibility of detection of Earth approaching objects by gravity?
- Sven E
- · Replies 12 ·
High School Are there any blue shifted galaxies name rc2?
- akshitha135
- · Replies 1 ·
High School Why does our Universe have more electrons than positrons?
- Leo Liu
- · Replies 7 ·
High School How do we calculate galaxy rotation if dark matter doesn't interact with ordinary matter?
- etotheipi
- · Replies 5 ·
Stargazing Spotted comet NEOWISE naked eye from a city of 80,000
- George Jones
- · Replies 51 ·
Graduate Binnig's fractal evolution applied to multiple universes?
- Suekdccia
- · Replies 1 ·
Undergrad Laws Before Big Bang or After Big Bang
- iearthling
- · Replies 1 ·
High School The accelerated expansion of the universe; redshift and time/distance
- Enquerencia
- · Replies 3 ·
Undergrad Does a particular star's brightness change throughout the year?
- KurtLudwig
- · Replies 14 ·
Undergrad What Key Issues Should Cosmologists Address in the ΛCDM Model?
- ohwilleke
- · Replies 1 ·
High School Is there a dark gravity throwing off gravitational calculations?
- Rotating Wave
- · Replies 19 ·
Undergrad Speculative Term in Drake's Equation
- Buzz Bloom
- · Replies 23 ·
Undergrad Effects of hydrogen anions in the solar atmosphere
- sciFax
- · Replies 4 ·
Undergrad Why can you not describe massive neutrinos with a temperature?
- Phys12
- · Replies 3 ·
Undergrad Glass bottle with a prolonged neck that continues into the inner space
- Blokle
- · Replies 10 ·
High School By what process do different sized stars form?
- MikeeMiracle
- · Replies 7 ·
High School How long would terraforming Mars take with current technology?
- Gear300
- · Replies 14 ·
High School Largest Moon With A Concave Orbit
- 1977ub
- · Replies 2 ·
Old Astronomy Book Predicts the Kuiper Belt
- Mikestone
- · Replies 3 ·
Stargazing Using DSLR movies for Astro Image stacking application
- sophiecentaur
- · Replies 3 ·
Undergrad Does gravity affect aging on different planets?
- John SpaceY
- · Replies 7 ·
Undergrad Magnitude limits for active galactic nuclei
- snorkack
- · Replies 2 ·
Undergrad Does the expansion of the Universe affect orbiting bodies?
- Cato
- · Replies 82 ·
High School UV timelapse of the Sun in 4K, 52 min = 1 second
- Spinnor
- · Replies 3 ·
High School Why is the momentum of a star equal to the momentum of a planet?
- Saloed
- · Replies 8 ·
Undergrad Why does the Moon have only 1/6 Earth's gravity if it's 81 times less massive?
- Pierre Ordinaire
- · Replies 8 ·
Undergrad How do we observe the CMB at all?
- Phys12
- · Replies 6 ·
High School A Meritable Veritable Time Paradox?
- Gear300
- · Replies 16 ·
Undergrad What proof do we have that the universe is homogenous?
- Phys12
- · Replies 4 ·
High School Planet orbits in binary star systems and daily syzygy
- Kate_C
- · Replies 11 ·
Undergrad Are stable orbits possible between Mars and Jupiter?
- Albertgauss
- · Replies 9 ·
High School Low entropy early Universe and the heat death musings
- martix
- · Replies 5 ·
Graduate Can Cosmic Strings Trigger Vacuum Decay?
- Trollfaz
- · Replies 1 ·
Stargazing Starlink satellites interfering with astronomy observations
- davenn
- · Replies 59 ·
Undergrad Can you See Neighboring Asteroids from an asteroid?
- Albertgauss
- · Replies 15 ·
Graduate MATLAB code for elliptical orbit elements and shadow entry/exit
- spaceiscoolright
- · Replies 8 ·
Undergrad Are Intensity and Magnitude independent of the radius of a star?
- Lucy_1192
- · Replies 8 ·
High School What effect will SpaceX's 42K satellites have on astrononical viewing?
- swampwiz
- · Replies 3 ·
Undergrad Reionization and the free-flow of light
- Ranku
- · Replies 7 ·
High School The Coronal Heating Problem - The Hydrogen Fusion Core disappears?
- Gfellow
- · Replies 18 ·
Undergrad How Does The Cosmic Microwave Background Show That The Universe is Expanding?
- Rodrigo Olivera
- · Replies 24 ·
Stargazing Planetary orbits -- Why do planets orbit at same “level”?
- Josh0768
- · Replies 5 ·
High School Mining asteroids for minerals and resources?
- ElliotSmith
- · Replies 1 ·
Undergrad What causes Kuiper/Ort cloud objects to become comets?
- Albertgauss
- · Replies 5 ·
High School Rationale behind certain aspects of Space exploration
- X11400
- · Replies 3 ·
Undergrad Is Negative Dark Energy Density a Valid Concept in Universe Models?
- Arman777
- · Replies 9 ·
Stargazing Assessment of astronomical numbers like those of Proxima Centauri
- cjackson
- · Replies 15 ·
Graduate Can Minkowski space be used as a grid to map other spacetime solutions?
- homerwho
- · Replies 1 ·
Undergrad Meaning of the inertial energy density
- Arman777
- · Replies 1 ·