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
Why did people predict the world would end in 2012?
- tkitchen
- · Replies 6 ·
Graduate Do Boltzmann brains form more easily than universes?
- MarkeD
- · Replies 2 ·
Graduate What are the different theoretical shapes of black holes?
- jlroitman
- · Replies 8 ·
Graduate Queston On The Theory Of Everything
- sudhirking
- · Replies 3 ·
Graduate Negative Acceleration in Black Holes
- humuus
- · Replies 4 ·
Graduate The fuzzball proposal for black holes
- wolram
- · Replies 1 ·
Graduate Visualizations without space-time or light
- wawens
- · Replies 35 ·
Graduate Angular momentum of an oblate spheroid
- stevebd1
- · Replies 4 ·
Graduate Does the information loss paradox depend on Hawking radiation existing?
- spidey
- · Replies 5 ·
Graduate Beckenstein Bound: Understanding Smolin's Entropy Bounds
- Coin
- · Replies 4 ·
High School How do we determine the age of the universe and Earth?
- jfrancis
- · Replies 7 ·
Graduate Have physicists rebutted E. Lester Smith's Intelligence Came First theory?
- asterias
- · Replies 3 ·
Graduate At the April APS meeting: curing cosmic singularities
- marcus
- · Replies 1 ·
Undergrad Dark energy sources for a cosmology paper
- Jared37
- · Replies 6 ·
Graduate Rotational kinetic energy and gravity
- stevebd1
- · Replies 3 ·
Graduate How Do Black Hole Masses Compare to Normal Matter in the Universe?
- CosmiCarl
- · Replies 5 ·
Undergrad What Keeps the Galaxy Intact?
- Peralta_Man
- · Replies 4 ·
Largest Known Star: Introducing Myself and Cosmology
- Star-Gazer
- · Replies 3 ·
Graduate Who the top quantum cosmology researchers are
- marcus
- · Replies 34 ·
Graduate Titius-Bode law, any analytical or numerical derivation?
- Ulysees
- · Replies 14 ·
Graduate Relativity or Relativistic Theromdynamics
- hagopbul
- · Replies 4 ·
Graduate Warm dense matter phase and early universe models before decoupling
- jal
- · Replies 5 ·
Undergrad Human versus robotic spaceflight
- D H
- · Replies 46 ·
Graduate Finding asteroid orbital period from equilibrium temperature of 200 K
- rodrigues
- · Replies 4 ·
Graduate Solar corona luminosity curve versus distance
- Eleftheria
- · Replies 2 ·
Undergrad Universe burnout-What's so hard about that
- Capernicus
- · Replies 17 ·
High School Everything is part of something bigger
- sudhirking
- · Replies 11 ·
Graduate Escaping the Impending Heat Death of the Universe: A Possibility or a Fantasy?
- hammertime
- · Replies 3 ·
Graduate Is There a Contradiction Between Entropy in Thermodynamics and Cosmology?
- josephpalazzo
- · Replies 8 ·
Just one irrefutable datum point
- wolram
- · Replies 1 ·
Graduate What Lies Beyond Our Universe? Physicists' Opinions
- lionell
- · Replies 2 ·
Graduate Universe doesn't equal Time travel
- runicle
- · Replies 5 ·
Undergrad What would happen to Earth without the moon?
- Ulysees
- · Replies 12 ·
High School Why don't we feel Earth's rotation if we're moving with it?
- mnhtapu
- · Replies 13 ·
Undergrad Gamma Ray burst in the Milkey Way
- talmans
- · Replies 12 ·
High School Why do rockets need engines to change direction in space?
- Ry122
- · Replies 7 ·
Graduate Snowplow model of a supernova remnant
- Tuugii
- · Replies 4 ·
High School Would the Moon keep rotating if Earth disappeared?
- Timoothy
- · Replies 14 ·
High School Demonstrating Moon's Lack of Internal Rotation
- Timoothy
- · Replies 10 ·
Graduate Universal quality of virial theorem
- giann_tee
- · Replies 1 ·
High School Finding a Local Star Like Ours: 10-50 LY Radius
- MDW
- · Replies 1 ·
Undergrad Have cosmology discoveries stalled since 2022?
- Chaos' lil bro Order
- · Replies 8 ·
High School How much energy does the sun produce per second?
- Holocene
- · Replies 5 ·
Undergrad Why is the Earth getting closer to the sun and the moon getting farther away?
- DM
- · Replies 5 ·
Undergrad Naked-Eye Visible GRB: Witnessing Halfway Across All Creation
- DaveC426913
- · Replies 5 ·
Undergrad Why don’t planet hunters find black holes?
- jimgraber
- · Replies 2 ·
High School Why do we see the near side of the moon only?
- anonymoussome
- · Replies 23 ·
Graduate Urban legends in authoritative astronomy
- Ken G
- · Replies 46 ·
High School Earth's Closest Approach to the Sun: Does the Date Change?
- Ulysees
- · Replies 4 ·
Graduate Can Early Dark Energy Affect Standard Rulers in Cosmology?
- wolram
- · Replies 1 ·
What are the limiting factors in this case
- mubashirmansoor
- · Replies 4 ·
Undergrad Why Does Earth's Axis Precess Like a Spinning Top?
- Ulysees
- · Replies 3 ·
Graduate Is the Entropy of Black Holes Measurable for Non-Exotic Black Holes?
- RasslinGod
- · Replies 6 ·
Graduate Good textbooks on modern cosmology ?
- smallphi
- · Replies 6 ·
Graduate How Do Interpretations of Hubble Expansion Differ Empirically?
- my_wan
- · Replies 5 ·
Graduate Minimum value of g for blackhole
- spidey
- · Replies 1 ·
Undergrad Light Entering Black Hole: Observed or Not?
- spidey
- · Replies 5 ·
Have You Read Weinberg's Cosmology Yet?
- superpoincare
- · Replies 9 ·
Undergrad How Are Black Holes Detected and Measured?
- shaan_aragorn
- · Replies 11 ·
Alternative idea on expanding universe
- W3pcq
- · Replies 12 ·
Undergrad Will a universe 96% dark matter eventually collapse or keep expanding?
- viridian
- · Replies 7 ·
Undergrad Relation between earth position in orbit and its tilt
- pixel01
- · Replies 5 ·
Graduate Is There a Universal Point Where All Moments in Time Exist Simultaneously?
- zengin
- · Replies 4 ·
Graduate Angular size, black body radiation, parallax and magnitude of 51 Pegasi
- SilverHammer
- · Replies 1 ·
High School Newbie question on atsrophotography
- Holocene
- · Replies 2 ·
Graduate Is the Secret Number to the Universe 10^122?
- SF
- · Replies 16 ·
High School A Beginner's Guide to Learning About Black Holes
- Owen-
- · Replies 9 ·
Graduate Estim. dark energy up by 3 percentage points. Any reaction?
- marcus
- · Replies 3 ·
Graduate Gravity for a stellar black hole
- stevebd1
- · Replies 26 ·
Undergrad Can two stars have the same apparent but different absolute magnitudes
- bse
- · Replies 6 ·
Graduate Superbubbles from shock waves from supernova or stellar winds?
- sarahrose
- · Replies 2 ·
Undergrad Earth/solar position vs spiral arms
- ray b
- · Replies 3 ·
Graduate Meaning of setting the scale factor equal to 1 at present epoch
- kdv
- · Replies 3 ·
High School Moon Preservation: What if a Spaceshuttle or Missile Hit It?
- h.g.Whiz
- · Replies 5 ·
How many people object to a big bang creation-like event?
- Chronos
- · Replies 9 ·
Undergrad What Material Makes Up Black Holes?
- pixel01
- · Replies 6 ·
Astronomy Videos: Collection by NGC6822 on YouTube
- drosser
- · Replies 1 ·
Anybody know anything about parallelogram mounts
- Saladsamurai
- · Replies 6 ·
Undergrad . Radio Spectroscopy -> Finding the doppler shift in a graph
- PhysicsHelp12
- · Replies 1 ·
Graduate Question from a fool about the big bang
- zengin
- · Replies 13 ·
Undergrad How did the universe expand 78 billion light years in 11-20 billion years?
- hedkrash
- · Replies 5 ·
Graduate Tired light vs. expanding universe
- ntdg634
- · Replies 2 ·
Undergrad What causes the equatorial bulge?
- Sheneron
- · Replies 10 ·
Graduate Is Cosmological Inflation the reason for the uniformity of the universe?
- Dav333
- · Replies 8 ·
Graduate How would a universe with zero total mass behave?
- Xbehave
- · Replies 8 ·
Graduate A question regarding the orbit of material in a galaxy such as ours
- shalayka
- · Replies 2 ·
Undergrad Can two planets inhabit the same orbit?
- astro1000000
- · Replies 4 ·
An astrophysicist (+blogger) to be aware of
- marcus
- · Replies 0 ·
Undergrad Just Checking - Calculating Angular Diameter of Moon
- TFM
- · Replies 2 ·
Graduate Can there be anything outside of our Existance?
- Blahness
- · Replies 15 ·
Graduate Measuring the temperature of quasars
- Frank Lampard
- · Replies 2 ·
Undergrad Finding absolute magnitude from parallax and apparent magnitude
- redbaldyhead
- · Replies 1 ·
Graduate Could Dark Matter be mass in EM fields?
- warwickphys
- · Replies 7 ·
How to solve an HR diagram problem
- Tuugii
- · Replies 3 ·
Graduate Dark Energy and the Accelerating Universe (survey)
- marcus
- · Replies 2 ·
Undergrad Advantage of measuring stellar parallaxes from Mars rather than Earth?
- bse
- · Replies 2 ·
Graduate Would dark matter accumulate at the centers of stars and planets?
- nesp
- · Replies 11 ·
Graduate Acceptable cosmological discussions
- CBC
- · Replies 4 ·
Support Space Exploration: Agree or Not?
- wolram
- · Replies 1 ·
Graduate If blackholes, then antiblackholes?
- pseudo
- · Replies 2 ·