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 Great Analogy of Holding a Rope Above a BH?
- Drakkith
- · Replies 3 ·
Graduate The meaning of the curvature term
- Loro
- · Replies 6 ·
Graduate Is the mass of a black hole diminishing for a free falling observer ?
- dreynaud
- · Replies 7 ·
Graduate Cosmo calculator-recession speed tutorial
- marcus
- · Replies 67 ·
Undergrad Does light slow down when traveling through dark matter?
- 721
- · Replies 3 ·
Graduate What is Magnetic Buoyancy and How Does it Affect Neutron Stars?
- ImaLooser
- · Replies 6 ·
Graduate Cantor, infinity and cosmology
- dkotschessaa
- · Replies 24 ·
Graduate Neutron star temperature and cooling
- tom.stoer
- · Replies 8 ·
Graduate What is the significance of JD and how is it calculated?
- JeffOCA
- · Replies 8 ·
Undergrad When astronomers speculate the distance of galaxies are they talking about its
- =entropy
- · Replies 1 ·
Graduate Hubble's law and cosmological density
- Naty1
- · Replies 20 ·
Graduate Does Creation of Energy in Universe Violate Conservation of Energy?
- Pandasaur1702
- · Replies 13 ·
Graduate Best Computer Language for Employment
- Andy Morris
- · Replies 6 ·
High School What is the minimum angular distance from the Sun for Venus to be visible?
- kaleidoscope
- · Replies 4 ·
Undergrad Does dark energy affect space between small objects like Earth and the sun?
- binbots
- · Replies 32 ·
What Should I Include in a 15-Minute Astronomy Presentation for Special Kids?
- loocary
- · Replies 4 ·
High School Learning about the edge of the universe without advanced math
- sambarbarian
- · Replies 5 ·
Did We Just Witness a Supernova in M95?
- Drakkith
- · Replies 11 ·
Undergrad Why Does the Analemma Show an Ellipse for Solstices?
- JeffOCA
- · Replies 8 ·
Graduate Is order a natural occurrence or a result of chaos?
- Primus2x
- · Replies 7 ·
High School Human Eyes See Cosmic Bubbles that Algorithms Miss
- Dotini
- · Replies 4 ·
Graduate What Are the Major Conflicts with Standard Cosmology Models?
- bill alsept
- · Replies 16 ·
Graduate How Can an Infinite Universe Have Finite Energy?
- JamesOrland
- · Replies 45 ·
Graduate Why do observatory cupolas have aeration gaps and why are some painted green?
- JeffOCA
- · Replies 4 ·
Graduate How Can You Determine the Right Ascension of a Star with a Meridian Circle?
- JeffOCA
- · Replies 3 ·
Graduate Determining Mass Ratio of Double Star Systems with Spectroscopy
- JeffOCA
- · Replies 9 ·
Graduate How Can the Big Bang Be Visible Everywhere in the Universe?
- SREW
- · Replies 7 ·
Graduate Gnawing questions about the Edge of our Universe
- Quiksilver421
- · Replies 4 ·
How are binary star systems formed?
- Newtons Apple
- · Replies 7 ·
Undergrad Is Anti-Matter Hiding in the Universe as Dark Matter?
- Ravi Mandavi
- · Replies 3 ·
Undergrad Could two space elevators on opposite sides of Earth reduce cable stress?
- FXForLife
- · Replies 18 ·
Graduate Are galaxies moving faster than the speed of light?
- Gregory.gags
- · Replies 46 ·
Graduate Dark matter and gravitational pull of energy
- guss
- · Replies 2 ·
Undergrad Difference Between Plasma and Radiation
- hamzaaaa
- · Replies 5 ·
Undergrad First magnetic phenomenon observed on the Sun
- colin456
- · Replies 1 ·
Flyaround video of Vesta as seen from low orbit by Dawn
- marcus
- · Replies 5 ·
Stargazing Telescope optical path length vs focal length
- balaonspace
- · Replies 2 ·
Graduate Where can i find tensor analysis expained physically in simplest words?
- G.S.RAMYA
- · Replies 8 ·
Graduate Are We Accelerating Away from Distant Galaxies?
- Daniel Batt
- · Replies 11 ·
Undergrad Difference Between Solar proton event and Coronal mass Ejection
- hamzaaaa
- · Replies 1 ·
Graduate Redshift Effect on Absorption/Emission Lines
- Drakkith
- · Replies 6 ·
Graduate Could a carbon planet have been formed in the solar system?
- Shraa
- · Replies 5 ·
High School Was I Spotting Mars in the East?
- TeddeF
- · Replies 5 ·
High School Why do certain objects in space orbit others?
- accelerate23
- · Replies 3 ·
Graduate What is the conflict between General theory of relativity and Quantum theory?
- G.S.RAMYA
- · Replies 38 ·
Graduate The Mass cut - The relation between 44Ti and 56Ni in supenovae remnants
- PaulWright
- · Replies 1 ·
Dark Matter Core Defies Explanation
- Lensman
- · Replies 28 ·
Undergrad Can we seek out worlds closer to the center of the galaxy?
- Dark Universe
- · Replies 27 ·
Graduate Why don't we see the other dimensions ?
- Abidal Sala
- · Replies 2 ·
Undergrad Oribtal and rotational velocities
- mun
- · Replies 2 ·
Graduate Are there any peer reviewed sources of a theory which calls for a smaller
- =entropy
- · Replies 1 ·
Graduate Time curvature and twin paradox.
- Imax
- · Replies 24 ·
Graduate How much speed does a satellite gain when orbiting through resistance?
- Bjarne
- · Replies 10 ·
Graduate Understanding Universe from laws extracted from the Universe?
- ExNihilo
- · Replies 5 ·
High School Intelligent Life on Europa Speculation
- golmschenk
- · Replies 7 ·
Undergrad What is our Solar System's orbital plane around the Milky Way?
- Chaos' lil bro Order
- · Replies 43 ·
Graduate Questions about geometric albedo and phase angle
- nnj
- · Replies 1 ·
Graduate Does any gravitating body emit Hawking radiation?
- johne1618
- · Replies 1 ·
Graduate Will the Universe End in a Big Crunch?
- jacksdvds
- · Replies 35 ·
Graduate Exploring Black Hole Anatomy: The Singularity, Event Horizon, and Photon Sphere
- bill alsept
- · Replies 67 ·
Undergrad Does space expand as a surface of higher-dimensional space?
- cask1
- · Replies 1 ·
Proving the Moon Landing: Facts and Evidence
- ryder
- · Replies 4 ·
Stargazing Looking to buy my first telescope
- Millacol88
- · Replies 11 ·
Graduate Important question (possible end of the world scenerio?)
- mzoltan14
- · Replies 15 ·
Graduate The Limitations of Intergalactic Travel
- eNtRopY
- · Replies 104 ·
Undergrad What lies beyond the visible universe?
- Dark Universe
- · Replies 1 ·
Graduate How to Calculate the Length of a Quasar Jet?
- ibysaiyan
- · Replies 1 ·
Graduate List of Questions about Black Holes
- MeLlamoLlama
- · Replies 15 ·
Graduate How far back can big bang theory go, and what about energy origins?
- Hypatio
- · Replies 2 ·
Graduate How comes the big bang singularity didn't need space and time?
- Abidal Sala
- · Replies 6 ·
Graduate What are the Physical effects of the expansion of the Universe
- ashwinnarayan
- · Replies 5 ·
Graduate Age of the Universe: Can We Assign an Exact Age?
- Froglet
- · Replies 2 ·
Undergrad What causes the variation in Mercury's synodic period?
- niki999
- · Replies 2 ·
High School Jupiter-Venus Conjunction: How Often Does It Occur and How Can We Calculate It?
- iamBevan
- · Replies 2 ·
Undergrad What is a wormhole and how does it relate to the universe and space?
- Ravi Mandavi
- · Replies 2 ·
Graduate Can We Witness the Big Bang with FTL Travel?
- dpa
- · Replies 5 ·
Graduate Are dark energy and dark matter the same?
- clarinets
- · Replies 5 ·
Graduate Is the universe finite or infinite based on spacetime curvature?
- QuantumJG
- · Replies 115 ·
Undergrad Celestial sphere and visible stars
- LAHLH
- · Replies 6 ·
Stephen Hawking starring in The big bang thoery.
- MartinJH
- · Replies 12 ·
Undergrad How to learn celestial mechanics
- pc2-brazil
- · Replies 20 ·
Does the multiverse exist and would all physical laws apply everywhere?
- Otherkin
- · Replies 78 ·
Undergrad The perihelion precession of Jupiter
- Bjarne
- · Replies 9 ·
Where can I find reliable sources for online astrophysics lessons?
- choc1202
- · Replies 3 ·
Graduate Thoughts on Space/Time and Gravity
- Manosapien
- · Replies 3 ·
Detecting an Ancient Civilization's satellite?
- Archaeopteryx
- · Replies 6 ·
Graduate Why does Hubble distance differ from current galaxy distance due to look-back time?
- Froglet
- · Replies 17 ·
High School What Geomagnetic Storms release proton or electron?
- oem7110
- · Replies 3 ·
Graduate Dark energy expansion and the Hubble diagram
- Froglet
- · Replies 1 ·
Graduate The Significance of Pi: Is It Related to Spatial Dimensions?
- mjacobsca
- · Replies 3 ·
Graduate Ratio of projectile to ejecta mass, shoot the moon.
- Spinnor
- · Replies 3 ·
Graduate Particles of the most recent Solar ejection.
- Rob D
- · Replies 1 ·
Graduate Why Do We Use a Mean Sun That Moves Along the Equator Instead of the Ecliptic?
- JeffOCA
- · Replies 4 ·
Graduate Scalefactor calculations for special cases using the Friedmann Equation
- karan9
- · Replies 6 ·
Stargazing Why Are Planets So Small Through My Telescope?
- upgrade3
- · Replies 30 ·
Undergrad How can we know/check the sun's current and latest chemical composition?
- kweba
- · Replies 4 ·
Graduate What Has SETI Ruled Out in the Search for Alien Civilizations?
- Rasalhague
- · Replies 38 ·
Undergrad Dark matter - observational evidence
- sri sharan
- · Replies 14 ·
Graduate Looking for someone who can do calculations on flyby anomaly.
- Messenger
- · Replies 9 ·
High School Antimatter cloud near the galactic center
- Tanelorn
- · Replies 5 ·