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
Graduate The unification of quantum theory and relativity theory
- BPL3
- · Replies 1 ·
Undergrad Energy production of star given mass?
- Lagraaaange
- · Replies 12 ·
Graduate Hawking radiation from not-a-black-hole?
- nikkkom
- · Replies 1 ·
Graduate What's the most massive white dwarf in the MW?
- AdamAutism1998
- · Replies 11 ·
Graduate R136a defies Laws of Stellar Evolution
- AdamAutism1998
- · Replies 22 ·
Graduate Ptolemy's Theory of the Empty Focus of an Elliptical Orbit
- greswd
- · Replies 4 ·
Graduate A. Pacholczyk: Radio Astrophysics (need a favor)
- Teenion
- · Replies 2 ·
Graduate Amount of dark Energy at different times
- 69911e
- · Replies 3 ·
Graduate Number density: Initial fluctuation strength and more....
- shadishacker
- · Replies 2 ·
Graduate Regarding the relationship of mass, velocity, and time
- mountainman
- · Replies 1 ·
Graduate Hubble Law and expanding universe
- Huej
- · Replies 2 ·
Graduate Is T Pyxis a Real Threat to Earth?
- AdamAutism1998
- · Replies 8 ·
Graduate Are white holes real or just a mathematical hypothesis?
- Astro-Anouar
- · Replies 27 ·
Graduate Galactic density in the low-mid distances from core
- Gerinski
- · Replies 3 ·
Graduate Are Electrons Really Indistinguishable in the One Electron Universe?
- Quotidian
- · Replies 5 ·
Graduate Can photons have mass if black holes can trap light?
- ganguly pranav
- · Replies 1 ·
Graduate Will VY Canis Majoris be the next massive star to go supernova?
- eachus
- · Replies 20 ·
Astrophotography with New Sensor - Improved Alignment & Stabilization
- Andy Resnick
- · Replies 10 ·
Undergrad Why is dark energy needed if cosmic expansion is decelerating?
- something111
- · Replies 1 ·
Graduate Does the CMB have depth from its 115,000-year recombination period?
- Gerinski
- · Replies 13 ·
High School How many stars we can see from Earth?
- Astrodent
- · Replies 8 ·
Graduate Is disorder required to store information?
- 24forChromium
- · Replies 1 ·
Geminid Meteor Shower: Peak Rates Up to 120/hr Dec 13-14
- davenn
- · Replies 5 ·
Graduate Difference between recombination redshift z=1500 and optical depth unity at z=1090
- Dr. Strange
- · Replies 5 ·
Graduate Why do Quantum Fluctuations need Inflation?
- Dr. Strange
- · Replies 14 ·
Graduate Is WD 1445+017 b the remains of a star?
- AdamAutism1998
- · Replies 1 ·
Graduate Did curvature exist between the Big Bang and inflation?
- Pianorak
- · Replies 3 ·
Graduate How redshift/brightness lead to acceleration/deceleration?
- astrobird
- · Replies 4 ·
Graduate Understanding Dark Energy and the Accelerating Expansion of the Universe
- Daniel K
- · Replies 7 ·
Graduate Interesting article about dark matter
- Tanelorn
- · Replies 16 ·
High School Is Voyager 40k years from a star?
- Rob Haskell
- · Replies 11 ·
High School Could Solar Wind and CMEs be Causing Magnetic Storms on Comet Catalina?
- discosucks
- · Replies 6 ·
Undergrad Theories about why the universe is expanding faster
- electric jake
- · Replies 8 ·
Graduate Does Jupiter have precession of the equinoxes?
- Hornbein
- · Replies 3 ·
Graduate How Do Binary Dwarf/Neutron Stars get so close?
- AdamAutism1998
- · Replies 3 ·
Undergrad What Causes the Sun's Unusual Orbital Path in a Java Solar System Model?
- whatisreality
- · Replies 1 ·
Graduate Possible LBV Detected in Mayall II Star Cluster
- AdamAutism1998
- · Replies 2 ·
High School Brief flash below Orion's sword at 3:55 AM Central time
- bahamagreen
- · Replies 4 ·
Graduate What is the expected form of dark energy as a function of universe size?
- 69911e
- · Replies 26 ·
Graduate How is the first peak of the CMB calculated?
- Dr. Strange
- · Replies 6 ·
Graduate What is the Role of Quantum Fluctuations in the Formation of Black Holes?
- wolram
- · Replies 5 ·
Graduate Accounting for time passed in our observation of the universe
- Rob Haskell
- · Replies 7 ·
Graduate Is it possible to shift between parallel universes?
- Dom1
- · Replies 6 ·
Undergrad Delta-v to overcome atmospheric and gravity drag at 13km?
- Treva31
- · Replies 2 ·
Graduate Higgs Boson Decays into Dark MAtter
- Quds Akbar
- · Replies 5 ·
Graduate Antineutrinos Candidates for Dark Matter?
- endoftimes
- · Replies 6 ·
Undergrad How often does the sun orbit the center of mass with multiple planets?
- whatisreality
- · Replies 3 ·
Graduate Optimizing Deep Sky Stacker settings for astrophotography
- Andy Resnick
- · Replies 1 ·
Stargazing Compute In-Band Irradiance with an Infrared Telescope
- user57304
- · Replies 1 ·
Undergrad Force required to "move" asteroid
- abhaybakshi
- · Replies 12 ·
Undergrad Image Processing Software for Solar Astrophysics Research
- Camilo160
- · Replies 2 ·
Graduate Question regarding What is the universe made of?
- Buzz Bloom
- · Replies 14 ·
High School What is the Physical Meaning of Permittivity of Free Space?
- gracy
- · Replies 20 ·
Undergrad Ball thrown from ISS to earth at right angle to it's path
- abhaybakshi
- · Replies 2 ·
Undergrad Why they don't increase altitude of ISS to overcome drag
- abhaybakshi
- · Replies 2 ·
Graduate Does Increasing Luminosity Affect the Percentage of Dark Matter in a Galaxy?
- Huej
- · Replies 4 ·
Graduate Were the "Dark Ages" really dark?
- Gerinski
- · Replies 3 ·
High School Why there are summer and winter seasons?
- Hectix
- · Replies 4 ·
Undergrad Abt seeing the Andromeda Galaxy with the naked eye in future
- Algren
- · Replies 6 ·
Undergrad How Does Rosetta Maintain Orbit Around a Low-Gravity Comet?
- abhaybakshi
- · Replies 7 ·
Undergrad Must the universe have a geometric center if it's finite?
- thetexan
- · Replies 106 ·
High School Why does Venus transit occur between the Sun and a superior planet, not just Earth?
- azizlwl
- · Replies 3 ·
What would we find traveling outward past the solar system?
- Alexis Deitz
- · Replies 8 ·
Online Sources for Kepler Exoplanet Data
- DuckAmuck
- · Replies 1 ·
Graduate Question re equilibrium abundance of a protons and electrons
- Buzz Bloom
- · Replies 12 ·
Undergrad Why is normal force in a satellite zero?
- Yatin
- · Replies 3 ·
Graduate Is it possible that "dark matter" is a side effect?
- SCSF
- · Replies 2 ·
Undergrad Two satellites A and B move around earth in a circular orbit
- Yatin
- · Replies 2 ·
Graduate Inflation, comoving Hubble radius and particle horizon
- JJNic
- · Replies 1 ·
Undergrad Will Radial Escape Velocity Launch a Satellite Into Orbit?
- Yatin
- · Replies 3 ·
Graduate Calculating Core Temperature of a Brown Dwarf
- rpthomps
- · Replies 7 ·
High School So I want to bend space lots of times
- 3301
- · Replies 6 ·
What can a newcomer to astronomy bring to the table?
- Ironmanlet
- · Replies 6 ·
Graduate Black holes' existence from our point of view
- Gerinski
- · Replies 1 ·
Graduate Gravitational effect of a black hole based on distance
- Gerinski
- · Replies 9 ·
Graduate How (un)stable are the Lagrangian points 1, 2 and 3?
- xpell
- · Replies 5 ·
High School Difference between Cosmology and Astronomy
- Salman Ranjha
- · Replies 4 ·
Undergrad Could Ben Carson's skepticism of the Big Bang affect NSF funding?
- gleem
- · Replies 152 ·
Graduate Do black holes above a certain mass become wormholes?
- stooch
- · Replies 13 ·
Graduate Does All Energy Affect Spacetime Curvature?
- TimeRip496
- · Replies 1 ·
Graduate Does time dilation occur between comoving galaxies?
- eugene pletcher
- · Replies 8 ·
Undergrad Can a Lost Spaceship Navigate Back to Earth in the Milky Way?
- KenNKC
- · Replies 36 ·
High School How does retrograde motion work relative to Earth's movement?
- Sobi
- · Replies 2 ·
Graduate How can the universe be larger than light could travel in its age?
- myric
- · Replies 4 ·
Undergrad Particle-antiparticle abundance before baryon and lepton annihilation
- Buzz Bloom
- · Replies 2 ·
Graduate Why is there no DM halo around the solar system?
- Buzz Bloom
- · Replies 62 ·
High School Will We Witness a Daytime Visible Supernova in the Near Future?
- Sobi
- · Replies 6 ·
Graduate Describing elliptic orbit as a parametric function
- Tegewaldt
- · Replies 6 ·
Graduate Can space itself act as an fuel?
- ForcaNL
- · Replies 2 ·
Full moon photography at 1/200s, f/5.6, ISO 64
- Andy Resnick
- · Replies 1 ·
Undergrad How do black holes get so massive
- wolram
- · Replies 15 ·
Graduate Some questions on the Cosmological Principle
- rede96
- · Replies 50 ·
Graduate Can a galaxy at z=8.68 disprove the LCDM theory?
- wolram
- · Replies 1 ·
Graduate An argument that massive particles don't redshift?
- jcap
- · Replies 14 ·
Stargazing Choosing a first telescope under $100 for planets and the moon
- Ibn Sina
- · Replies 7 ·
Graduate Ancient Galaxies twice the size of the Milky Way
- Tanelorn
- · Replies 4 ·
Undergrad Why does the Drake equation give current civilizations rather than total created?
- Andrew Jacobson
- · Replies 5 ·
High School What is Dark Matter and Dark Energy?
- Aero_Arnendu
- · Replies 4 ·
Graduate Did Venus's Lack of Plate Tectonics Contribute to Losing Its Oceans?
- innerlight
- · Replies 8 ·
Graduate Did the Big Bang happen instantaneously or over a duration?
- Brunolem33
- · Replies 75 ·