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 Is the Big Bang Actually a White Hole?
- rootone
- · Replies 22 ·
Graduate New paper on the cosmological constant
- phyzguy
- · Replies 1 ·
High School Radiation shielding and redirecting
- sillls
- · Replies 44 ·
High School The Mysterious Shape of Jupiter: Why Gas Planets Stay Spherical
- timothychoi
- · Replies 24 ·
High School Does gravity become repulsive in a shrinking universe?
- cmb
- · Replies 7 ·
High School Intensity of Spherical Shell of Stars
- Kelli Van Brunt
- · Replies 4 ·
Undergrad I computing the CMB Damping Tail
- Quarkly
- · Replies 4 ·
Graduate Anisotropic Universe and Friedmann Equations
- member 657093
- · Replies 27 ·
High School Which rate of Universe expansion are we currently using?
- HankDorsett
- · Replies 10 ·
High School What are the maximum masses of White Dwarves and of Neutron stars?
- Cerenkov
- · Replies 4 ·
Undergrad Were paths of Voyager craft lucky to get out of the heliosphere?
- swampwiz
- · Replies 1 ·
Undergrad Is the total energy of the observable universe constant?
- cmb
- · Replies 26 ·
Graduate Future of the electron neutrino mass limits
- exponent137
- · Replies 5 ·
High School Looking for opinions on YouTube Fermilab videos
- HankDorsett
- · Replies 10 ·
Undergrad Europa Clipper Interplanetary Mission
- rootone
- · Replies 4 ·
Undergrad Relationship between collision and relaxation
- Astroiaco
- · Replies 1 ·
High School Distance traveled by light accounting for expansion
- etotheipi
- · Replies 22 ·
Undergrad New measurement of the Hubble Parameter
- windy miller
- · Replies 4 ·
Graduate Gas around the black hole of galaxy M87
- Olias
- · Replies 17 ·
Undergrad "It from Bit" and the multiverse?
- Suekdccia
- · Replies 1 ·
High School Universe rate of expansion: speeding up or slowing down?
- CosmologyHobbyist
- · Replies 5 ·
Undergrad Distance using Cepheid variables
- Phigla
- · Replies 8 ·
High School Rate of the expansion of the Universe and the Big Bang
- HankDorsett
- · Replies 11 ·
If you could see gravity what do you think it would it look like?
- jt3213
- · Replies 16 ·
Undergrad Solving the Horizon Problem: 1 Source or 105?
- QuarkDecay
- · Replies 12 ·
High School Is the Gamma Ray Burst Diameter Wide Enough to Engulf Our Solar System?
- mieral
- · Replies 10 ·
High School The Physics of a Black Hole Merger: What Happens to Mass?
- beamthegreat
- · Replies 7 ·
Undergrad Is there a radial gradient of redshifts within individual galaxies?
- hkyriazi
- · Replies 10 ·
Undergrad Why are planets visible in a telescope in the daylight?
- truffaldino
- · Replies 9 ·
Undergrad Did Wheeler consider Carter's anthropic multiverse?
- Suekdccia
- · Replies 1 ·
Undergrad Does Spatial Curvature Falsify Eternal Inflation?
- windy miller
- · Replies 8 ·
High School Our universe was connected to another universe?
- ElliotSmith
- · Replies 4 ·
Undergrad Discrepancy in Hubble's "constant" and its implications
- Phys12
- · Replies 8 ·
Graduate Equilibrium point of matter and radiation density
- QuarkDecay
- · Replies 15 ·
High School Questions about cosmic background radiation
- HankDorsett
- · Replies 14 ·
High School What is the size of the observable Universe?
- HankDorsett
- · Replies 59 ·
High School Age of the Universe at the recombination?
- mbond
- · Replies 8 ·
High School Age of the Universe vs Age of the Stars
- Benfield
- · Replies 8 ·
Undergrad Any direct measure of Universe expansion via galaxy subtended angles?
- hkyriazi
- · Replies 60 ·
Graduate Part of the Hubble discrepancy can be explained by local underdensity
- phyzguy
- · Replies 6 ·
Graduate The Habitable Exoplanet Hunting Project
- alberto91
- · Replies 1 ·
Undergrad Deflect Asteroid w/ Collisions: Calculating Theta & MJ Interractions
- dedocta
- · Replies 1 ·
High School How to calculate a star's luminosity/radius
- Bipo10
- · Replies 15 ·
Graduate Friedmann-Robertson-Walker Models
- QuarkDecay
- · Replies 4 ·
Undergrad The Symmetry of Angular Momentum Conservation
- Alfredo Tifi
- · Replies 7 ·
Undergrad CMBR & Flatness: Mapping Universe Flatness?
- Ranku
- · Replies 12 ·
Stargazing Two White Dwarfs in a seven minute mutual orbit
- diogenesNY
- · Replies 6 ·
High School Resources to help understand black holes
- HankDorsett
- · Replies 2 ·
Graduate Is the Hubble Constant Truly Constant?
- ea251ah
- · Replies 4 ·
High School Is the Instantaneous Expansion of Space-Time Possible?
- StuartL
- · Replies 1 ·
Undergrad Did Planet 9 and Neptune Cause Uranus' Tilt?
- bbbl67
- · Replies 5 ·
High School Is the Milky Way Warped? New 3D Map Reveals Surprising Findings
- jedishrfu
- · Replies 4 ·
Undergrad What is Earth's future warming due to the Sun's increasing luminosity?
- swampwiz
- · Replies 7 ·
Undergrad On Hubble's constant, the expansion of the Universe and vacuum energy
- Cathr
- · Replies 6 ·
Undergrad How much worse is the location of La Palma vs. Mauna Kea?
- swampwiz
- · Replies 6 ·
High School Experiment involving Kepler's laws
- Shukie
- · Replies 1 ·
Stargazing Mysterious Phenomenon Seen in the Night Sky
- Meliaveil
- · Replies 6 ·
Graduate Resolving power of a radio telescope array: Quantum or classical?
- Michael Price
- · Replies 7 ·
Stargazing Two moons, two different rotational paths around a planet?
- ArthurArbeid
- · Replies 2 ·
Undergrad What is the Maximal Parallel Velocity of a Satellite in an Elliptical Orbit?
- andrea1313
- · Replies 1 ·
Undergrad Free Orbit Insertion: Is it Possible?
- pasanta
- · Replies 2 ·
Undergrad How Can We Interact with Dark Matter for Sci-Fi Novel?
- Zguy1217
- · Replies 38 ·
Undergrad What do "marginalized" or "marginalized error" mean? (contours - posterior)
- fab13
- · Replies 11 ·
Undergrad Does the Strong Anthropic Principle have any equivalent specific model?
- Suekdccia
- · Replies 1 ·
Undergrad Are dark matter and dark energy caused by same phenomenon?
- Buster59
- · Replies 4 ·
Undergrad E- & Ions Deflection by Earth's Magnetic Field
- darkdave3000
- · Replies 30 ·
Stargazing CApollo 11 50th Anniversary: CSPAN3 Coverage Today
- diogenesNY
- · Replies 3 ·
Undergrad Some redshift from prism effect of a gravitational lens?
- Dustin Maki
- · Replies 18 ·
High School Questions regarding expansion, the vacuum in space, and black holes
- Mburris87
- · Replies 6 ·
High School What would happen if the core of the sun were removed?
- Presenter
- · Replies 2 ·
Undergrad Earth’s Magnetic field formula or downloadable vector field
- darkdave3000
- · Replies 13 ·
Graduate Probability distribution: exponential of a quartic
- vvaibhav08
- · Replies 1 ·
High School Cloud Cities on Venus: Viability & Feasibility
- GTOM
- · Replies 14 ·
Undergrad Fraction of solar systems with an Earth-moon configuration?
- Buzz Bloom
- · Replies 8 ·
Undergrad New table-top gravitational-wave detector proposed
- Zeke137
- · Replies 2 ·
High School When could life theoretically exist in any star system after the Big Bang?
- lucas_
- · Replies 22 ·
High School Can Hypothetical FTL Technologies Enable Travel to Other Bubble Universes?
- windy miller
- · Replies 21 ·
High School What is the important scale of things in the Universe?
- Suppaman
- · Replies 11 ·
High School Dark Matter & BAO: How Does it Suppress Baryonic Oscillations?
- wolram
- · Replies 6 ·
High School Thirty Meter Telescope can resume construction
- mfb
- · Replies 2 ·
High School Examples of theoretical proofs overturned by evidence?
- Cerenkov
- · Replies 32 ·
Undergrad Chameleon Theory: Detecting the Particle with Astronomical Surveys
- fresh_42
- · Replies 4 ·
Undergrad Question about the Cosmological Constant
- Buzz Bloom
- · Replies 3 ·
Undergrad Is the Solar Constant Really 340 W/m^2 or 680 W/m^2?
- waynesplash
- · Replies 6 ·
Undergrad Can Satellites in Frozen Orbits of the Moon Study Different Ground Areas?
- Sam Phillips
- · Replies 14 ·
Undergrad What is the geometric plan for ALMA?
- swampwiz
- · Replies 19 ·
Undergrad Can the LIGO observatories detect (with accuracy) temblors?
- swampwiz
- · Replies 2 ·
Undergrad Formula for the large-scale bias of galaxies
- fab13
- · Replies 4 ·
Undergrad Is Infinity Possible Within Our Finite Universe?
- pelletboy
- · Replies 76 ·
Undergrad Hubble's law and conservation of energy
- olgerm
- · Replies 85 ·
Undergrad The laws of thermodynamics and the Universe
- PhysicsNoob00
- · Replies 16 ·
High School How Is Methane Disappearing from Mars' Atmosphere?
- gleem
- · Replies 17 ·
High School What is responsible for the spinning of a galaxy?
- MikeeMiracle
- · Replies 5 ·
Graduate Forecast with Fisher formalism : loss or gain of information
- fab13
- · Replies 8 ·
Undergrad How can an asteroid get caught at a Lagrange point without a "brake"?
- Jonathan212
- · Replies 44 ·
High School Why do pictures of stars have 4 cardinal points?
- swampwiz
- · Replies 33 ·
High School Do planets without a solid surface precess?
- metastable
- · Replies 4 ·
Graduate Determine whether A is orbiting B
- h4tt3n
- · Replies 2 ·
Undergrad Amount of energy inside a sphere of radius 1au around the Sun
- confusedhome
- · Replies 14 ·
Stargazing Event Horizon Telescope Results Released Yesterday (April 10, 2019)
- mfb
- · Replies 129 ·