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
High School What Causes the Phenomenon of Cosmic Inflation?
- BadgerBadger92
- · Replies 18 ·
Graduate Zero-Energy Universe: Stephen Hawking Explains
- Mircea Golumba
- · Replies 19 ·
High School What is the gravitational force like near a black hole?
- Timothy Schablin
- · Replies 5 ·
Undergrad False vacuum and matter density
- Ranku
- · Replies 7 ·
Undergrad Understanding the Ly-α Forest for EnSlavingBlair
- EnSlavingBlair
- · Replies 5 ·
Undergrad Image of a Newly Formed Planet in a Disk Around a Star
- BillTre
- · Replies 3 ·
Undergrad Particle acceleration and kinetic energy
- spossatamente
- · Replies 1 ·
Stargazing Achieving Better Astrophotography at Home
- sophiecentaur
- · Replies 39 ·
Graduate Is there a reason the Big Bang would be secret?
- BadgerBadger92
- · Replies 3 ·
Graduate Is the Universe a Self-Similar Tesselation?
- Jebediah Kerman
- · Replies 29 ·
Graduate What are the frontiers of cosmology research?
- Avi Nandi
- · Replies 9 ·
Undergrad About gravitational binding energy and kinetic energy
- GabrielLight
- · Replies 11 ·
Obituary of Constance Adams, Space Habitat Designer
- BillTre
- · Replies 1 ·
Undergrad Is the Milky Way's halo curved spacetime?
- tomwestboro
- · Replies 1 ·
High School Why do most of the celestial bodies rotate about their axis?
- MeAndMyLucidLife
- · Replies 10 ·
Undergrad Inflation and density perturbations
- Ranku
- · Replies 2 ·
High School Hubble’s Constant Changes Over Time
- jedishrfu
- · Replies 2 ·
Undergrad Black hole vs mathematical singularity
- LYCON
- · Replies 2 ·
High School Equivalent gravitational forces in other galaxies
- jk22
- · Replies 3 ·
High School Oumuamua non-gravitational acceleration
- TeethWhitener
- · Replies 1 ·
High School Lowest possible altitude for a Satellite
- jms4
- · Replies 32 ·
High School Please explain to me the 2d holographic universe
- empleat
- · Replies 3 ·
High School How large was the Universe at its moment of creation?
- BadgerBadger92
- · Replies 19 ·
High School What is the role of a non-real observer in mathematical thinking?
- Suekdccia
- · Replies 1 ·
Undergrad How on Earth This is possible? (distance to a far galaxy)
- Prof Sabi
- · Replies 4 ·
Undergrad How stellar aberration was quantified in the early days
- Gene Naden
- · Replies 5 ·
Undergrad Entropy and contracting universe
- Schnellmann
- · Replies 10 ·
Undergrad Can Boltzmann Brains Form in an Infinite Universe?
- DannyTr
- · Replies 19 ·
Undergrad If the Universe’s Mass was 100 At the Moment of the Big Bang....
- Islam Hassan
- · Replies 13 ·
Undergrad How do we get stars so much more massive than the Sun?
- zuz
- · Replies 16 ·
High School How does 400 sigma compare with 5 sigma?
- Cerenkov
- · Replies 17 ·
High School Big Slurp: What Is It and How Does It Work?
- LYCON
- · Replies 1 ·
High School History question -- The choice of the North Pole being up or down
- Grinkle
- · Replies 18 ·
High School What Makes Red Dwarf Stars Cooler Than the Sun?
- hyunxu
- · Replies 44 ·
High School Help with understanding a Friedmann flat universe
- Cerenkov
- · Replies 13 ·
Undergrad Manned mission to Europa: science or still scifi?
- Aidyan
- · Replies 8 ·
Undergrad How Does Angular Diameter Distance Apply to the Last Scattering Surface?
- WeiShan Ng
- · Replies 2 ·
Undergrad 2 second delay at the merger of two neutron stars in August 2017
- exponent137
- · Replies 4 ·
Undergrad Curve fitting the luminosity distance and redshift data
- redtree
- · Replies 5 ·
Stargazing A good telescope with tracking for deep sky objects
- kolleamm
- · Replies 17 ·
High School Could Gravitational Waves Allow for Time Travel?
- yerty4235437y
- · Replies 7 ·
High School Does Negative Mass Impact Expansion in Vacuum Space?
- yerty4235437y
- · Replies 6 ·
Undergrad Why was the early universe's entropy low?
- Thecla
- · Replies 1 ·
High School What is the Speed of Light in Dark Matter?
- Sanborn Chase
- · Replies 29 ·
Graduate Methane and Organic Molecules on Mars
- BillTre
- · Replies 18 ·
Undergrad Does the barycenter of the Earth-Moon system change?
- Sven E
- · Replies 2 ·
Undergrad Does the Uncertainty Principle imply a linear cosmology?
- jcap
- · Replies 3 ·
Stargazing Could the 1841 Meteor in Puget Sound Be Something Else?
- diogenesNY
- · Replies 17 ·
High School Is space is continuous or discrete?
- Varsha Verma
- · Replies 10 ·
High School Do multiverses follow the same laws of physics?
- kolleamm
- · Replies 1 ·
High School What is the speed of the Earth traveling through the cosmos?
- john1800
- · Replies 11 ·
Stargazing How is noise removed in radio telescopes?
- Phys12
- · Replies 28 ·
Undergrad Question about the Na-O anti correlation
- crescentcavae
- · Replies 1 ·
High School Would planets fall out of orbit when gravity has a speed?
- Erribert
- · Replies 7 ·
Undergrad What to do with unused space in a home freezer?
- Richard Crane
- · Replies 20 ·
Stargazing What makes the Thirty Meter Telescope a game-changer for astronomy?
- Chronos
- · Replies 2 ·
Undergrad Did NASA's Curiosity Rover Discover Ancient Organic Matter on Mars?
- DrClaude
- · Replies 2 ·
Undergrad How many degrees / radians is one full orbit of the Earth?
- Patrick Aberdeen
- · Replies 8 ·
High School Doesn't there have to be more than one observable universe?
- platosuniverse
- · Replies 41 ·
Undergrad What does L star mean in the Schechter function?
- I_laff
- · Replies 3 ·
Undergrad Are displaced dark matter and curved spacetime same thing?
- Luke W
- · Replies 12 ·
Undergrad Big Bang Singularity: Was It As "Infinitely Dense" As We Think?
- Ratman101
- · Replies 35 ·
Stargazing Spotting the ISS With My Binoculars: A Lucky Moment
- Prof Sabi
- · Replies 10 ·
Undergrad Why Is the Velocity of an Oort Cloud Object Approximately Zero?
- I_laff
- · Replies 5 ·
Undergrad Does red shift approach infinite near time zero?
- DarkMattrHole
- · Replies 14 ·
Undergrad Where Did the Universe's Antimatter Go?
- Pouya Pourkarim
- · Replies 2 ·
Undergrad How to check if stellar/galactic spectrum extraction went well?
- SMBH
- · Replies 3 ·
High School Is there a way to measure gravity in a particular area of space
- nuby
- · Replies 14 ·
Undergrad Galaxy with no dark matter? (NGC1052-DF2)
- phinds
- · Replies 108 ·
High School Threshold of gravitational pull over dark energy
- rede96
- · Replies 66 ·
High School LIGO's Detection of Gravitational Waves: BH-BH & BH-NS Mergers
- wolram
- · Replies 6 ·
High School Calculating Weight and mass of entire black hole
- hyunxu
- · Replies 11 ·
High School Spectroscopy of Stars: Electrons in Plasma
- Sophrosyne
- · Replies 4 ·
Undergrad How is color added to Hubble images?
- Phys12
- · Replies 7 ·
Undergrad Understanding 2012 VP113's Perihelion and Its Significance in Planetary Origins
- fizzy
- · Replies 1 ·
High School Could a Black Hole Cause a Sunrise in the West?
- Ashraf Siddiqui
- · Replies 34 ·
Undergrad Did astronomers just lengthen the expected life of the Sun by 5 Gy?
- swampwiz
- · Replies 5 ·
High School Bubble universes and infinite in extent
- laymanB
- · Replies 28 ·
Graduate Does a Quasar Have Proper Motion?
- quasarLie
- · Replies 22 ·
Undergrad Have we measured the change in the red shift over time?
- Justin Hunt
- · Replies 3 ·
High School The Future of the Universe: When Will It End?
- Jimmy87
- · Replies 28 ·
Undergrad Perceived Speed of Objects in Space
- krs1
- · Replies 5 ·
Stargazing What Causes the NEQ6 Pro Mount to Have 'Brain Failure' During Alignment?
- sophiecentaur
- · Replies 4 ·
Undergrad V774104: Mysterious Sednoid with No Known Orbit
- nikkkom
- · Replies 8 ·
Undergrad Conservation of Energy on the Cosmological Scale
- Islam Hassan
- · Replies 2 ·
Undergrad Andromeda and the cosmological redshift
- nmsurobert
- · Replies 28 ·
Stargazing Where did oxygen come from? Stars or something else?
- Morlaf
- · Replies 21 ·
High School Photon mean free path (regarding CMB black body assumption)
- bahamagreen
- · Replies 7 ·
Undergrad Relationship between stellar mass and core mass?
- bbbl67
- · Replies 7 ·
Undergrad Frequency of nearby Supernova Explosions
- windy miller
- · Replies 13 ·
Undergrad Atmospheric CO2 and diurnal Asymmetry
- johnbbahm
- · Replies 10 ·
Undergrad How can I go about making a "Space Proof" coating?
- Tech2025
- · Replies 3 ·
Undergrad Cosmological Redshift and Heisenberg Uncertainty Principle
- e2m2a
- · Replies 5 ·
High School Did Astronomers Really Think the Milky Way Was the Only Galaxy in 1900?
- Thecla
- · Replies 8 ·
Undergrad On gravity and the conservation of energy
- Catreece
- · Replies 30 ·
Stargazing Zeiss Terra ED 10x42 Binos for stargazing?
- Doc Al
- · Replies 8 ·
High School How Did the Big Bang Happen If the Speed of Light Is a Limit?
- Gondur
- · Replies 13 ·
Undergrad SU(2) invariance implies isotropy?
- JuanC97
- · Replies 7 ·
Graduate What are the typical uncertainties of data in Astophysics?
- Fabioonier
- · Replies 7 ·
Graduate Multiverse reduction in the new Hawking/Hertog model?
- Agrippa
- · Replies 28 ·