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 Is Spacetime Capable of Tearing or Breaking Down?
- r.hackett
- · Replies 3 ·
Graduate Direct detection of dark matter tendrils?
- ivorax
- · Replies 7 ·
What is the heaviest thing in the universe?
- markf
- · Replies 8 ·
Graduate Source of magnetic field of Neutron stars.
- lindloda
- · Replies 2 ·
Graduate Spacetime as concentric shells in the balloon analogy
- Faradave
- · Replies 17 ·
Graduate Heat Interactions with Non-Normal Matter
- danielu13
- · Replies 4 ·
Undergrad How do you calculate declination and Right Ascension from Earth Coordinates?
- Brynjolf
- · Replies 3 ·
Graduate Understanding Rotation Curves: A Study of Galactic Density and Derivatives
- Dan_
- · Replies 1 ·
High School A theory about the beginning of the universe
- Ultimation
- · Replies 7 ·
Graduate Understanding the Zero Energy Principle of the Universe
- johne1618
- · Replies 39 ·
Graduate Isotropic and homogeneous of space
- sadegh4137
- · Replies 3 ·
Graduate Will matter eventually decay as the universe expands indefinitely?
- MathematicalPhysicist
- · Replies 72 ·
Graduate At what speed are we moving through space?
- jabbercookie
- · Replies 19 ·
Graduate How is gravity considered as the weakest force?
- B.M.Gray
- · Replies 10 ·
Undergrad Does the universe have a centre?
- francium87
- · Replies 18 ·
Graduate Astrophysics book for dark matter research with mass prediction methods
- plasmon
- · Replies 3 ·
Graduate Could constant expansion appear to accelerate with distance?
- Deeviant
- · Replies 17 ·
Undergrad Does light have mass and is it affected by gravity?
- Safamm
- · Replies 10 ·
Undergrad Basic Big-Bang ?'s For First Thread
- B.M.Gray
- · Replies 9 ·
Graduate Geocentricism, could you comment on a conversation I had about it?
- jarrah-95
- · Replies 6 ·
Graduate The Universe shouldn't look like it does if it is expanding
- dedwarmo
- · Replies 27 ·
Graduate Cherenkov radiation detection
- stargazer3
- · Replies 8 ·
Undergrad Can you have binary stars with the same radius but different masses?
- AussieDave
- · Replies 5 ·
Graduate Coarsely modeling impacts between bodies on a planetary scale
- SkyMarshal
- · Replies 3 ·
Graduate Latest z >1 Type1a supernova results?
- johne1618
- · Replies 2 ·
Graduate On the Origin of Solar and Stellar Magnetic Fields
- betzalel
- · Replies 7 ·
Graduate Theory based on red and blue shifts
- warriorjoe007
- · Replies 4 ·
Undergrad Instruments and Imaging: How to prevent condensation inside a closed system?
- Astrid
- · Replies 4 ·
Graduate What is the Latest Measurement of the Hubble Constant Using Infrared Light?
- Faradave
- · Replies 4 ·
Graduate Could a universal Oort cloud structure cause expansive acceleration?
- superdave
- · Replies 15 ·
Graduate What Is a Black Hole Firewall?
- Vorde
- · Replies 2 ·
Graduate Could dark energy and expansion of space be just a topological effect?
- Artifex 28
- · Replies 2 ·
Graduate When talking cosmology what exactly is a manifold, is there any
- wolram
- · Replies 5 ·
Graduate Cosmic Distance Ladder: Advancing Physics of Cosmic Distances
- Chronos
- · Replies 2 ·
Graduate What are the objectives of the GAIA mission and satellite?
- Astronuc
- · Replies 2 ·
Graduate Could the universe be modeled as a Turing machine?
- algorithmDesi
- · Replies 6 ·
Discover the Fascinating Olber's Paradox in This Cartoon Cosmology Video
- JesseC
- · Replies 3 ·
Graduate Questioning the Expansion theory
- ekeeley
- · Replies 2 ·
Undergrad Is space a physical entity or just a conceptual framework?
- Obani
- · Replies 8 ·
Graduate Expansion of the universe and the speed of light
- DHF
- · Replies 15 ·
Graduate Gravity and Acceleration on a 50,000 km Space Elevator
- jack5000
- · Replies 5 ·
High School Why are more massive planets not closer to the Sun?
- Magnawolf
- · Replies 14 ·
Undergrad Can Slow Space Travel Overcome the Speed Barrier in Vacuum Flight?
- spacecadet11
- · Replies 2 ·
Why a space before a punctuation mark?
- jtbell
- · Replies 23 ·
Graduate How Are Elements Beyond Iron Created in Stars?
- solarblast
- · Replies 1 ·
High School Duke University Astronomy 101 Online Course
- Greg Bernhardt
- · Replies 1 ·
Undergrad Are supermassive black holes counted as visible matter in galaxy mass calculations?
- iMatt
- · Replies 4 ·
Graduate Why does a black hole have an event horizon if it has the same mass as a star?
- jldibble
- · Replies 20 ·
Undergrad Available Astronomy Research Topics?
- bleist88
- · Replies 1 ·
Graduate Why cannot the universe have net angular momentum?
- chill_factor
- · Replies 9 ·
Stargazing Bought Orion AstroView 90mm, good?
- CowedbyWisdom
- · Replies 9 ·
Graduate Would missing light from galaxies explain gravitational lensing without dark matter?
- euquila
- · Replies 13 ·
Undergrad Does the Doppler effect violate energy conservation for photons?
- Bridgeboy
- · Replies 18 ·
Graduate Naive question regarding black holes.
- rbj
- · Replies 2 ·
Graduate Black hole has a partiuclar fixed volume
- shivakumar06
- · Replies 3 ·
Undergrad How Can I Estimate Local Sidereal Time in My Head?
- bossman27
- · Replies 4 ·
Undergrad Solar system space dust avg density[kg/m^3]
- R.L.Jacobsen
- · Replies 4 ·
Graduate After watching the Stephen Hawking Series
- u84six
- · Replies 9 ·
Undergrad Why don't planets spiral into the sun or escape its gravity?
- mugenshiyo
- · Replies 7 ·
Graduate Is spacetime physical or just a tool to describe change?
- mdl
- · Replies 32 ·
Undergrad A basic question on gravity from a novice
- flinky
- · Replies 15 ·
High School Radio communication from the galaxy's far side?
- modus
- · Replies 10 ·
Undergrad What Would Happen If Mars Had a Higher Density and Maintained Its Radius?
- willstaruss22
- · Replies 13 ·
Graduate What is the Probability of Multiple Universes?
- applebob
- · Replies 2 ·
Graduate Light from MACS 1149-JD implausible
- applebob
- · Replies 4 ·
Graduate Omega being less than one in a flat Universe?
- TheTraceur
- · Replies 1 ·
Graduate Do Tidal Forces in Black Holes Affect Matter at the Quantum Level?
- tanzanos
- · Replies 4 ·
Graduate Gravitational binding energy of some stuff
- jetwaterluffy
- · Replies 2 ·
Undergrad Is Everything Shrinking Instead of Space Expanding in the Big Bang Theory?
- Jeremy87
- · Replies 14 ·
Graduate Is the CMBR a relic from the big bang or an image from background galaxies?
- Lino
- · Replies 6 ·
Graduate Number of Voids in the (observable) Universe
- voidx
- · Replies 16 ·
Undergrad Is the only evidence for an expanding universe the doppler Red Shift?
- Chas Tennis
- · Replies 2 ·
Undergrad Which Observational Project sounds funner/easier?
- RockenNS42
- · Replies 6 ·
High School Is Jupiter Brighter When Far from Venus?
- PhanthomJay
- · Replies 27 ·
Undergrad The importance of atmospheres for the planetary temperature
- RobinSky
- · Replies 5 ·
Graduate 3-dimensional implications of a black hole
- wetwonder
- · Replies 27 ·
Undergrad How fast was the meteorite traveling when it entered the atmosphere?
- H2Bro
- · Replies 1 ·
Can Light Be Slowed or Even Stopped?
- Tim13
- · Replies 8 ·
Undergrad Perpendicular velocity of planets
- KasperHdL
- · Replies 4 ·
Graduate If the universe is expanding, what is it expanding into?
- hmetkaya
- · Replies 37 ·
High School Gravitational Pull: Sun vs. Earth's on Moon
- acvessey
- · Replies 4 ·
Feynman checkerboard as a model of discrete space-time
- wellingboy
- · Replies 1 ·
Graduate Would Cosmic Expansion Break a Tether Between Galaxies?
- Chiclayo guy
- · Replies 10 ·
Graduate Gravitational Lensing and Redshift
- SHISHKABOB
- · Replies 5 ·
Graduate Does the holographic principle remove the need for dark matter
- Lino
- · Replies 2 ·
Graduate How inflation solves the horizon problem
- Soph_the_Oaf
- · Replies 10 ·
Graduate Is Dark Matter Uniformly Distributed Locally and in Distant Galaxies?
- notaclue
- · Replies 9 ·
Graduate Minimum Satellite Period problem
- Eric M. Jones
- · Replies 12 ·
Graduate Would motion explain the missing 'dark matter'?
- oracle1965
- · Replies 7 ·
Graduate Effect of gravitational tides on the moon
- altergnostic
- · Replies 27 ·
Undergrad Understanding Elliptical Orbits: Foci, Center, Barycenter, and Mass Relationship
- mhuang
- · Replies 1 ·
Graduate Why isn't dark matter concentrated at the centers of stars and planets?
- swemy
- · Replies 26 ·
Graduate Why is the age of the Universe the reciprocal of the Hubble constant?
- johne1618
- · Replies 33 ·
Undergrad Is the Sun Really Older Due to Relativity?
- CuriousQ
- · Replies 8 ·
Undergrad Could Dark Energy be Dark Matter cooling?
- Reverend2010
- · Replies 44 ·
Graduate Could a cosmo tabulator give hands-on experience with cosmic Event Horizon?
- marcus
- · Replies 10 ·
Graduate Can We Pull a Metal Ball Out of a Black Hole With a Steel Cable?
- Algren
- · Replies 17 ·
Undergrad Stellar Nebulae and angular momentum
- mateomy
- · Replies 3 ·
Graduate Is the Decaying Vacuum Model a Complete Description of Cosmic Expansion?
- wolram
- · Replies 1 ·
High School Black holes and gravity basic questions
- danman21
- · Replies 7 ·