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 Spatial homogeneity and the functional form of two-point functions
- Frank Castle
- · Replies 8 ·
Undergrad Evidence to support the theory of stellar nucleosynthesis?
- Hunter1234
- · Replies 3 ·
Undergrad Understanding Wiki's Milky Way Galaxy rotation chart
- hendoS
- · Replies 3 ·
Undergrad Hawking radiation and energy-negative energy pair production
- Rocha
- · Replies 4 ·
Undergrad What differentiates inflationary models from each other?
- windy miller
- · Replies 2 ·
High School Is expansion caused by unknown tension in space/time?
- thetexan
- · Replies 1 ·
Undergrad Comparing Earth's diameter with Moon's diameter
- prashant singh
- · Replies 2 ·
Graduate Does dark matter really carry five times the energy of ordinary matter?
- DLSieving
- · Replies 4 ·
Undergrad Calculating star radius and mass from spectral class, B-V index, and luminosity
- gunhed508
- · Replies 4 ·
Undergrad Calculation of mean energy value of photons in recombination
- eliot13
- · Replies 4 ·
Undergrad Exponential expansion of inflation
- Ranku
- · Replies 9 ·
Undergrad How can I calculate red shift for intragalactic bodies
- Frank Einstein
- · Replies 2 ·
High School How Can I Improve Pointing and Eyepiece Quality on My Dobsonian Telescope?
- sophiecentaur
- · Replies 13 ·
High School What percentage of the visible universe have we physically explored?
- iDimension
- · Replies 2 ·
Undergrad Is the influence of dark matter symmetric?
- nortonian
- · Replies 4 ·
Graduate April 23rd Magnetosphere Anomaly
- IbogaMoon
- · Replies 6 ·
High School Is the Big Bang a Result of a Spontaneous Singularity?
- thetexan
- · Replies 2 ·
Graduate Could we slow Mars's orbit to bring it closer to Earth's?
- tobyr65
- · Replies 29 ·
Undergrad Why does acceleration point to an open universe if CMBR shows flat?
- Willfrid Somogyi
- · Replies 3 ·
Undergrad Could "reverse entropy stars" exist in our universe?
- Seanra
- · Replies 12 ·
Undergrad How Do We Measure the First Second of the Universe?
- SiliconGene
- · Replies 11 ·
Undergrad Does Space Compressibility Affect the Big Bang?
- Puma
- · Replies 1 ·
High School What is the mysterious red rectangle around HD 44179?
- Dotini
- · Replies 8 ·
Undergrad Meteor impact and axial tilt, relation to climate
- cbrons
- · Replies 5 ·
High School Does universal expansion push Earth away from the Sun?
- kenny1999
- · Replies 8 ·
High School Fermi Paradox: What are your opinions on the Fermi Paradox?
- man like bush
- · Replies 4 ·
High School I've done it the wrong way roundn
- sophiecentaur
- · Replies 5 ·
High School Voyager 1 - image of 'Pale Blue Dot'
- Tebor
- · Replies 9 ·
High School How do physicist determine the energy of the universe?
- houlahound
- · Replies 4 ·
High School Is Earth's Movement Away from the Sun Impacting Global Warming?
- SkinniestGoblin
- · Replies 8 ·
Undergrad What does cosmological redshift do to light
- whatphysics
- · Replies 5 ·
Graduate Do White Holes Violate 2nd Law of Thermodynamics?
- Tengo Preguntas
- · Replies 2 ·
Undergrad CMB contrast slider tool to visualize temperature variations
- windy miller
- · Replies 2 ·
High School Have we observed antimatter in the early universe?
- KarminValso1724
- · Replies 5 ·
Undergrad How can the universe be infinitely big?
- bluemoonKY
- · Replies 5 ·
High School Could dark energy just be caused by virtual particles
- KarminValso1724
- · Replies 1 ·
Undergrad What Are the Proposed Alternatives to the Multiverse Theory?
- windy miller
- · Replies 17 ·
Undergrad Calculating average density of the Universe
- bobo1455
- · Replies 2 ·
Undergrad The observable Universe and its shape
- revo74
- · Replies 68 ·
Graduate "Observation" of Black Hole Merger
- ObjectivelyRational
- · Replies 3 ·
High School How important is gravitational red/blueshift for stars?
- Battlemage!
- · Replies 2 ·
Undergrad Factor of how much linear size scale has changed
- bobo1455
- · Replies 2 ·
High School The Fate of Gaseous Planets: Can They Stay Stable Forever?
- fbs7
- · Replies 5 ·
Undergrad Is There a Preferred Axis in Cosmology and What Could Be Its Origin?
- wolram
- · Replies 8 ·
Stargazing Facing difficulties with radio telescope measurements
- Mange313
- · Replies 1 ·
High School What would happen if the Sun collided with a similar star?
- GiantSheeps
- · Replies 5 ·
High School Is Dark Energy Really Driving the Expansion of the Universe?
- Allen_Wolf
- · Replies 13 ·
High School Geometries of the Universe: What are the Most Accepted Models?
- Allen_Wolf
- · Replies 2 ·
Undergrad Could pulsar timing arrays see primordial gravity waves?
- windy miller
- · Replies 1 ·
Undergrad Deriving Equation of Motion for Quintessence Scalar Field?
- HashKetchum
- · Replies 9 ·
Graduate Can a planet be tidally locked to its moon?
- vladpaln
- · Replies 8 ·
High School The way the moon 'behaves', coincidence or 'something more'?
- victorhugo
- · Replies 13 ·
Stargazing Software to adjust exposure? webcam, astrophotography
- kolleamm
- · Replies 4 ·
Graduate Gamma ray burst associated with LIGO GW event
- Jonathan Scott
- · Replies 121 ·
Stargazing Double images in reflector telescope astrophotography
- kolleamm
- · Replies 13 ·
Graduate Tension between local and CMB measurements of Hubble constant
- mitchell porter
- · Replies 2 ·
Graduate Explore Binary System Inspiral w/ 1.5 Solar Masses
- wolram
- · Replies 10 ·
Undergrad Visualizing one-dimensional strings in spacetime
- fredreload
- · Replies 21 ·
Graduate In LIGO’s pulse, how much comes from BH merging/ inspiraling
- MaxWallis
- · Replies 16 ·
High School Why Polaris won't always be the North Star
- tony873004
- · Replies 6 ·
Undergrad Planet at barycenter of a binary system.
- vladpaln
- · Replies 3 ·
Undergrad How would one know whether a star would be observable?
- Barely_Conscious
- · Replies 1 ·
High School How does dark matter affect planetary motion?
- Zoey Brown
- · Replies 1 ·
Graduate Will a body ever escape in a 3 body problem?
- dynawics
- · Replies 5 ·
Undergrad Will a Slow Decrease in Dark Energy Density Alter the Fate of the Universe?
- Ranku
- · Replies 5 ·
Undergrad Axis of Evil": Power Asymmetry in the Universe
- windy miller
- · Replies 1 ·
High School What is causing the accelerated expansion of the universe?
- Allen_Wolf
- · Replies 6 ·
High School How Small Was the Big Bang Singularity When It First Exploded?
- dheeraj
- · Replies 5 ·
High School Does the Formation of Positive and Negative Mass Occur Throughout the Universe?
- Allen_Wolf
- · Replies 4 ·
Undergrad Understanding dark energy problem
- windy miller
- · Replies 4 ·
High School Why the Earth orbits around the Sun
- kenny1999
- · Replies 9 ·
High School Lowest/Highest mass of a star, star system
- Stephanus
- · Replies 11 ·
High School Is dark matter a different type of gravity?
- kcookson251
- · Replies 3 ·
Undergrad Why there are different size stars?
- wondercosmos
- · Replies 6 ·
High School Questions about the lifespan of the Earth
- kenny1999
- · Replies 5 ·
High School How to calculate the distance between a Star and Zenith
- KaBash
- · Replies 2 ·
Graduate Black Hole Paper Outlining Process of Singularity Formation
- ObjectivelyRational
- · Replies 5 ·
Graduate Are there widespread misconceptions about degeneracy pressure?
- Ken G
- · Replies 63 ·
Graduate Can entropic force explain the cosmological constant value?
- marcus
- · Replies 18 ·
High School What are the limitations of the heuristic picture of Hawking radiation?
- Allen_Wolf
- · Replies 28 ·
High School Can Living in Space Lead to Immortality Through Technology?
- Docscientist
- · Replies 9 ·
High School Does antimatter have positive or negative mass?
- MikeL#
- · Replies 3 ·
High School Can Cosmic Strings Align Black Holes?
- wolram
- · Replies 2 ·
Undergrad How Does Aerobraking Work for the ExoMars Orbiter?
- sophiecentaur
- · Replies 4 ·
High School Can we see individual stars in the Andromeda Galaxy?
- Stephanus
- · Replies 7 ·
High School What distance does stellar parallax actually measure?
- NatFex
- · Replies 29 ·
High School Is it possible for "nothing" to exist
- KarminValso1724
- · Replies 22 ·
Undergrad Can a Torus be Gravitationally Bound?
- Tom MS
- · Replies 3 ·
Undergrad Question about the cosmological constant
- Gerinski
- · Replies 2 ·
Undergrad What mathematical models describe spacetime malleability?
- Akshay69dante
- · Replies 2 ·
Insights A Brief on the Expansion of the Universe - Comments
- nikkkom
- · Replies 26 ·
High School Initial Impetus Needed for Curved SpaceTime?
- abrogard
- · Replies 22 ·
Undergrad Gravitational Binding Energy of a Torus
- Tom MS
- · Replies 1 ·
High School How did the Falcon landing work?
- wolram
- · Replies 9 ·
High School Could a big bang occur in my hand following quantum mechanics?
- Kris Lemkens
- · Replies 11 ·
High School What Are the Implications of Space Being the Ideal Medium for Light?
- alba
- · Replies 2 ·
Undergrad KELT-4Ab Orbital Characteristics
- |Glitch|
- · Replies 8 ·
High School Does universe expansion relate to mass-energy equivalence?
- Kris Lemkens
- · Replies 9 ·
Undergrad Are virtual particles the same in inflation and today?
- Ranku
- · Replies 7 ·
High School Entropy is greater in galaxies or pre atomic era
- houlahound
- · Replies 12 ·