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 How would magnetic field reversal affect electrical circuits?
- 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 Could Hubble see the Milky Way when it was only 800 million years old?
- Viopia
- · Replies 69 ·
Graduate Implications of Symmetry and Pressure in Friedmann Cosmology
- PeterDonis
- · Replies 2 ·
Undergrad Minimum number of supernovae needed to produce uranium
- CPW
- · Replies 8 ·
High School Can we observe anything beyond the CMB 'wall'?
- Cerenkov
- · Replies 5 ·
High School When did Gamov and Alpher predict the CMB spectrum?
- 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 ·
Graduate New paper on the cosmological constant
- phyzguy
- · Replies 1 ·
High School Radiation shielding and redirecting
- sillls
- · Replies 44 ·
High School How can a gas giant maintain a spherical shape?
- 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 Why does the horizon problem give 10^5 sources instead of one?
- QuarkDecay
- · Replies 12 ·
High School Is the Gamma Ray Burst Diameter Wide Enough to Engulf Our Solar System?
- mieral
- · Replies 10 ·
High School What happens when an antimatter black hole merges with a normal matter black hole?
- 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 Local underdensity may explain 5.5% of Hubble constant discrepancy
- 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 Does CMBR mapping measure spatial or spacetime flatness?
- Ranku
- · Replies 12 ·
Stargazing Two White Dwarfs in a seven minute mutual orbit
- diogenesNY
- · Replies 6 ·
High School Black hole theories and how they're presented
- 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 Why is the Milky Way warped?
- 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 Zig-zag moving object seen in night sky
- Meliaveil
- · Replies 6 ·
Graduate Can a radio telescope array resolve single photons better than one dish?
- 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 What detection methods have failed to interact with dark matter?
- 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 How solar wind electrons and ions deflect in Earth's magnetic field from a top-down view
- 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 Could floating cities on Venus extract resources profitably?
- 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 How does dark matter suppress baryonic oscillations?
- wolram
- · Replies 6 ·