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 Some questions related to the Cosmological Constant
- Arman777
- · Replies 4 ·
Undergrad CMBR and the expansion history of the Universe
- Ranku
- · Replies 2 ·
High School Are There Any Kardeshev 2.0 Civilizations in the Milky Way?
- stefan r
- · Replies 19 ·
High School How well do we know solar activity?
- Skiessa
- · Replies 3 ·
High School Milky Way is "in the top percentile of all the galaxies that exist"
- CygnusX-1
- · Replies 29 ·
Undergrad What does the cosmic inflation theory actually say about flatness?
- overzealous
- · Replies 9 ·
High School Name for the distribution of matter?
- Brian Turner
- · Replies 5 ·
High School Structure and Dynamics of Blue Supergiants
- lavinia
- · Replies 2 ·
High School Universe expansion rate in m/s^2 ?
- roineust
- · Replies 20 ·
High School We see a quasar 13 billion light years away. What does this mean?
- Skiessa
- · Replies 4 ·
Undergrad What is the new source of space radiation discovered near Earth?
- davenn
- · Replies 46 ·
Undergrad Where does gravity switch from stronger to weaker, if it does?
- freeelectron
- · Replies 7 ·
Graduate What Does Space Gives Moving Orders Mean for Gravity in Einstein's Universe?
- Boballoo
- · Replies 5 ·
Undergrad Is Our Universe Finite or Infinite?
- Ehyeh Asher Ehyeh
- · Replies 9 ·
Undergrad The Multiverse and 'No boundary' conditions approach in cosmology
- Suekdccia
- · Replies 3 ·
High School Hip Replacements and Weather Sensitivity
- wolram
- · Replies 6 ·
High School What Are the Force and Speed of Pulsar Winds?
- Sundown444
- · Replies 19 ·
Undergrad Interpreting a scale factor vs. distance graph
- naushaan
- · Replies 13 ·
Undergrad Separating Masses in Kepler's Third Law
- KireeDendrall
- · Replies 1 ·
High School The search for habitable exoplanets in Alpha Centauri
- alberto91
- · Replies 2 ·
Undergrad Confusion over what exactly constitutes the ecliptic
- thebosonbreaker
- · Replies 3 ·
Undergrad Mass-luminosity relationship for red giants and AGB stars?
- tovisonnenberg
- · Replies 1 ·
Graduate Are Retrograde Satellites the Key to Stable and Optimal Orbits?
- mollwollfumble
- · Replies 5 ·
Undergrad Question about Galactic Rotation curves in the Milky Way galaxy
- KurtLudwig
- · Replies 14 ·
Undergrad Was the Early Universe as Dense and Hot as a Neutron Star?
- Greta
- · Replies 24 ·
Undergrad Calculating Speed and Acceleration of a Gas Blob Orbiting a Massive Black Hole
- naushaan
- · Replies 4 ·
High School Question about the Sun's gravitational influence on the Earth and its moon
- Evenlander
- · Replies 8 ·
Undergrad Would a rover on an asteroid float away because of the low gravity?
- sciencec
- · Replies 7 ·
Undergrad Does Euclidean geometry require initial fine-tuning?
- timmdeeg
- · Replies 19 ·
Undergrad How is asteroid 101955 Bennu possible?
- alva3
- · Replies 8 ·
High School What is the shape of an asteroid impact on Earth?
- Evenlander
- · Replies 3 ·
Friday's Historic All-Woman Spacewalk
- Greg Bernhardt
- · Replies 2 ·
High School Creating an Interstellar Dust Nebula Experiment: Tips and Tricks for Success
- angela6884
- · Replies 13 ·
Undergrad What happens to gravitational waves?
- StandardsGuy
- · Replies 28 ·
Undergrad Lambda CDM Model and Spatial Flatness
- timmdeeg
- · Replies 26 ·
Graduate Effects of gravity throughout space-time?
- TrentonF
- · Replies 6 ·
Undergrad Travel from Mars to Earth question......
- vicvalis
- · Replies 10 ·
Undergrad Maximum ##d_p(t_e)## value and its meaning
- Arman777
- · Replies 2 ·
Undergrad How can black holes with varying masses have the same extreme characteristics?
- Soul Intent
- · Replies 10 ·
High School Why does the Andromeda galaxy appear so tiny from our perspective?
- Dnj23
- · Replies 81 ·
Undergrad Heating/cooling moon tunnels, why and how?
- Fred Bobo
- · Replies 16 ·
High School Anyone here in the CA blackout area that has enjoyed dark skies?
- swampwiz
- · Replies 6 ·
Undergrad Matter-Antimatter black hole collision
- wheyghey
- · Replies 4 ·
Undergrad Hubble Law & SR: Does Velocity Increase Mass?
- Arman777
- · Replies 3 ·
Undergrad Is this explanation of "space itself expanding" correct?
- michelcolman
- · Replies 27 ·
Undergrad Are the red dots in the Whirlpool Galaxy individual red supergiants?
- swampwiz
- · Replies 2 ·
Undergrad Scale factor from Friedmann's equations
- TheMercury79
- · Replies 7 ·
Graduate Late Photons from the Early Universe?
- Benzij
- · Replies 1 ·
High School What parameters of physics are most important to the existence of life?
- Suppaman
- · Replies 29 ·
High School Nobel Prize for first exoplanet discovery
- bland
- · Replies 6 ·
Graduate Why isn't back-reaction receiving more study?
- phyzguy
- · Replies 18 ·
High School Atoms, Black Holes: Solving 2 Problems with 1 Theory?
- tony169
- · Replies 4 ·
High School Angular Meteorite Strikes on the Moons Surface
- Clay Gillespie
- · Replies 2 ·
Undergrad What is the current state of research on the nature of Time?
- samudra
- · Replies 13 ·
Undergrad How to Assign Initial Conditions for Binary Star Systems in a Simulation?
- Arman777
- · Replies 2 ·
High School What Happens to a Dead Galaxy's Mass?
- brand1130
- · Replies 15 ·
Undergrad How Does Kirchoff's Law Relate to Spectrum Intensity and Wavelength?
- SebastianRM
- · Replies 8 ·
Undergrad Hubble relation to Scale Factor
- TheMercury79
- · Replies 3 ·
High School A question about the Planck Epoch
- Quantum Alchemy
- · Replies 1 ·
High School Are Electrons & Protons Oriented in Stars Like Other Objects?
- PhDnotForMe
- · Replies 9 ·
Undergrad Is Planet 9 Actually a Primordial Black Hole?
- Tom.G
- · Replies 6 ·
Undergrad Cosmological scale and the pressure of light....
- AshPowers
- · Replies 6 ·
Undergrad How does BBT resolve away from "It should be a black hole"
- AshPowers
- · Replies 2 ·
Undergrad How can Kepler's laws be visualized using a simulator?
- Riverplatense
- · Replies 1 ·
Undergrad Measuring Galactic Rotation: How & What We Know
- PhDnotForMe
- · Replies 5 ·
Undergrad NASA's Black Hole Visualization/Explanation
- BillTre
- · Replies 13 ·
Undergrad Does a beginning to time imply absolute speed?
- Hiero
- · Replies 8 ·
High School Is there more to the Red Shift than we think?
- jeffinbath
- · Replies 18 ·
Graduate What's the Difference Between Gravitational Waves and Gravity Waves?
- math04
- · Replies 1 ·
Undergrad Could fundamental laws change in Dirac's Large Numbers Hypothesis?
- Suekdccia
- · Replies 1 ·
High School Superclusters and their galaxies
- Powehi
- · Replies 3 ·
Undergrad Cross Section of DM: What Are the Particle Candidates?
- Arman777
- · Replies 7 ·
High School Expanding Space in the Lab: Investigating the Possibilities
- Suppaman
- · Replies 10 ·
Possible to build a space tower?
- skyshrimp
- · Replies 28 ·
Stargazing Who Tracks and Warns Us About Asteroids?
- RetailPleb
- · Replies 9 ·
Anyone else thought the Moon last night was cool?
- HankDorsett
- · Replies 19 ·
Undergrad Is J0740+6620 an eclipsing system?
- GeorgeDishman
- · Replies 2 ·
Stargazing What explains the Luna impact gap?
- Gfellow
- · Replies 33 ·
Undergrad Electricity & Planetary Magnetic Field Reversal: Implications & Studies
- hiddenname
- · Replies 20 ·
Undergrad Could a Star Avoid a Supernova and Form a Black Hole?
- Boca
- · Replies 43 ·
Undergrad Have I got the right picture for cosmological redshift?
- George Keeling
- · Replies 2 ·
Graduate Stars: Light from the Past, End in Sight?
- homerwho
- · Replies 2 ·
Undergrad Challenges to the Redshift Method and Hubble's Law
- xhu2688
- · Replies 5 ·
High School What is the black that we see in the night sky?
- Meruem
- · Replies 13 ·
High School How do we resolve the Boltzmann Brain problem
- carl_sebastian
- · Replies 36 ·
High School How does the LIGO experiment affect SpaceTime?
- physicsnoobie79
- · Replies 7 ·
Undergrad Large Bipolar radio bubbles in the Galactic Centre
- Buzz Bloom
- · Replies 1 ·
High School A wormhole collides with a black hole -- what would happen?
- Brianok
- · Replies 4 ·
High School Questions about the Timeline of the Big Bang
- Cerenkov
- · Replies 32 ·
High School Do we have another interstellar visitor?
- Ophiolite
- · Replies 2 ·
Undergrad Would we ever be able to fully understand the laws of the universe?
- Delta2
- · Replies 3 ·
High School Can We See Our Past? - Milky Way & Hubble Telescope
- Viopia
- · Replies 69 ·
Graduate Implications of Symmetry and Pressure in Friedmann Cosmology
- PeterDonis
- · Replies 2 ·
Undergrad Question about stellar nucleosynthesis from a non-expert
- CPW
- · Replies 8 ·
High School Can we observe anything beyond the CMB 'wall'?
- Cerenkov
- · Replies 5 ·
High School Early Predictions of Hot Big Bang CMB: Gamov & Alpher
- windy miller
- · Replies 15 ·
Venera 13 photos from the surface of Venus
- ElliotSmith
- · Replies 3 ·
Stargazing What is the brightest red dwarf star seen from the Earth?
- Cerenkov
- · Replies 10 ·
High School What would it be like on Earth if it were not a sphere?
- AZFIREBALL
- · Replies 42 ·
Undergrad Is the Big Bang Actually a White Hole?
- rootone
- · Replies 22 ·