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 What Is the Next Step in Inflation Theory?
- sadraj
- · Replies 11 ·
Graduate How is the Big Bang producing singularity not a black hole?
- John Light
- · Replies 25 ·
Graduate Usage of doppler effect to measure speed of a galaxy
- junfan02
- · Replies 14 ·
Graduate Why does geopotential not take into account the rotation of the Earth?
- baxter
- · Replies 3 ·
Graduate Is Asymptotic Silence in Loop Quantum Cosmology the End of Time?
- skydivephil
- · Replies 3 ·
High School Where Can I Find a Detailed Ecliptic Monitor for Tracking Solar Terms?
- snoopies622
- · Replies 7 ·
Graduate What is the universe expanding into and what caused the big bang?
- Pohan
- · Replies 9 ·
Graduate Is the LCDM Model in Trouble with the BigBOSS Project?
- Chronos
- · Replies 1 ·
Graduate Negative gravitational energy - negative energy gravitons?
- petergreen
- · Replies 4 ·
Graduate Is Spacetime Infinitely Elastic or Does it Have an Elastic Limit?
- EskWIRED
- · Replies 28 ·
Undergrad How we know the universe has a beginning
- yrreg
- · Replies 18 ·
Graduate Is there any evidence for universe still expanding?
- Lok
- · Replies 8 ·
Graduate Local void consistency with Lambda CDM cosmology
- Chronos
- · Replies 3 ·
Graduate Gravitational Lensing: Is He Right or Wrong?
- whirlpoolm51
- · Replies 4 ·
Graduate About completeness of the Friedmann equations
- sergiokapone
- · Replies 8 ·
Graduate Is there a reason to believe there is more matter than anti-matter ?
- xortdsc
- · Replies 10 ·
Graduate Could Earth Capture a SECOND Satellite the size of the Moon?
- Taymith
- · Replies 32 ·
Graduate What is standard early inflationary cosmology?
- Naty1
- · Replies 7 ·
Graduate According to the inflation theory
- imsmooth
- · Replies 4 ·
Graduate Big Freeze: Entropy or Dark Energy?
- No-name
- · Replies 3 ·
Graduate How Does the Integral's Limit Affect the Dark Energy Density Equation?
- TimeFall
- · Replies 6 ·
Graduate Shannon Entropy and Origins of the Universe
- mr_whisk
- · Replies 3 ·
Undergrad Could the universe be a giant spinning teacups ride?
- tinypositrons
- · Replies 3 ·
High School Is Kepler 22 Visible from Earth with a Telescope?
- tinypositrons
- · Replies 1 ·
High School Which Layers of the Sun Emit Visible Light, UV, IR, and X-rays?
- jldibble
- · Replies 2 ·
Graduate Hawking's new paper - no BH, no EH
- bahamagreen
- · Replies 3 ·
Graduate Proxima Centauri's Unprecedented Passage
- CygnusX-1
- · Replies 2 ·
Graduate Temperature of CMBR compared to galaxies in general
- Herbascious J
- · Replies 2 ·
Graduate Anthropic Principle and Infinitely Minute Variations
- QuestionMarks
- · Replies 44 ·
High School Northern And Southern Hemisphere Of The Unvierse
- nick1o2
- · Replies 1 ·
Undergrad Calculating what latitude aurora is visible using KP Index
- erotavlas
- · Replies 2 ·
Graduate Blackhole radiation v Second Law
- ash99
- · Replies 1 ·
Graduate What is the total mass of the universe and what is the uncertainty?
- sWozzAres
- · Replies 32 ·
Graduate Ratio of positive to negative hydrogen ions in the universe?
- zmorris
- · Replies 1 ·
Undergrad Would Jupiter and Saturn survive if the sun went supernova?
- kuartus4
- · Replies 7 ·
Undergrad Problems understanding how universe has no center.
- jman
- · Replies 14 ·
Undergrad How do you find the temperature of the boomerang nebula?
- melodyman888
- · Replies 8 ·
Graduate Infinite universe and energy/matter boundaries
- guywithdoubts
- · Replies 31 ·
Undergrad Can Light Alter the Velocity of Asteroids in Space?
- BobbyWOMACK
- · Replies 2 ·
Mars mission video with explosions
- Naty1
- · Replies 7 ·
Undergrad What are past values of the Hubble constant and is there an archive for them?
- nick1o2
- · Replies 3 ·
Graduate Dark Energy as Gravitational Tidal forces?
- Glurth
- · Replies 3 ·
Undergrad Relationship between Gravity and Density
- uberhikari
- · Replies 7 ·
Undergrad Find Historical Critical Density Data
- nick1o2
- · Replies 10 ·
Graduate Consequences of folding spacetime and poking holes through it
- Kargo
- · Replies 4 ·
Graduate Recent measurements suggest the universe it is flat and infinite
- Alan McDougal
- · Replies 4 ·
Do Stars Have Van Allen Radiation?
- shounakbhatta
- · Replies 3 ·
Graduate How do we know the universe's expansion is accelerating?
- Damo ET
- · Replies 15 ·
Graduate How can we claim the Universe is 13.7 billion years old?
- Baggins101
- · Replies 5 ·
Graduate If we moved all matter in one direction, where would we end up?
- Emp-Naval
- · Replies 17 ·
Graduate Big bang , physical constants , possibilities
- Crazymechanic
- · Replies 38 ·
Graduate Is the Universe an Expanding Wavefront?
- marlowgs
- · Replies 1 ·
Undergrad Why do some nebulae form into stars while others remain diffuse?
- Nova
- · Replies 2 ·
Graduate Alan Guth, Gravitationally repulsive material?
- Herbascious J
- · Replies 27 ·
Graduate What is the radiation pressure on Earth if the sun was replaced by a black hole?
- ryan albery
- · Replies 20 ·
Undergrad How to Determine Absolute Magnitude
- ckirmser
- · Replies 1 ·
Graduate How could nothing is finite yet unbounded?
- Mohd Abdullah
- · Replies 15 ·
Graduate Are Primordial Black Holes the Missing Piece in the Dark Matter Puzzle?
- Chronos
- · Replies 2 ·
Stargazing Single-dish radio telescope aperture
- shirin
- · Replies 3 ·
Graduate Universe Expanding - Effects On Gravity?
- somedudeonline
- · Replies 5 ·
Graduate Resurrection of the WIMP as DM candidate
- Chronos
- · Replies 1 ·
Graduate How can light be older than the universe itself?
- JiBo
- · Replies 7 ·
Graduate Could Planck's constant relate to time's directionality?
- gavrosh
- · Replies 6 ·
Graduate Latest research in multidimensional space.
- MightyKaykoher
- · Replies 19 ·
Graduate How are elements produced in stars after iron?
- ajayguhan
- · Replies 4 ·
Graduate What speed is required for a 30-year journey to Alpha Centauri?
- texasman1979
- · Replies 6 ·
Graduate Is Dark Matter Actually Energy with Gravitational Effects?
- Petes
- · Replies 2 ·
Graduate White Holes created our Universe
- Singularity_BB
- · Replies 3 ·
Graduate Exponential potential for inflation
- shooride
- · Replies 3 ·
Graduate Why Does Iron Take More Energy to Create Fusion Than Other Elements?
- stardust
- · Replies 7 ·
Graduate What is the nature of information in black holes?
- shounakbhatta
- · Replies 5 ·
Undergrad Could gravitational lensing prove the universe to be older?
- TerryHM
- · Replies 1 ·
Undergrad Saturn-Sized Star Will Live For 12 Trillion Years
- CygnusX-1
- · Replies 2 ·
High School Hubble Picture Crushes Your Sense of Scale
- Greg Bernhardt
- · Replies 2 ·
Graduate Did inflation prevent matter and antimatter from meeting and annihilating?
- us40
- · Replies 22 ·
Graduate What will be the trajectory of space objects?
- AbhiFromXtraZ
- · Replies 4 ·
Graduate Comparable size of the observable universe immediately after inflation
- Herbascious J
- · Replies 8 ·
Graduate Regarding graviton and negative energy
- Herbascious J
- · Replies 2 ·
Graduate Early cosmic inflation and the expansion of the universe.
- Herbascious J
- · Replies 6 ·
Undergrad How can we improve asteroid detection to prevent future impacts?
- GTOM
- · Replies 2 ·
Graduate Elliptical Orbits and Resonance of Eccentricities
- Ian J.
- · Replies 4 ·
Graduate Help with abstract for pulsar radio astronomy lab report
- adam300
- · Replies 1 ·
Graduate PSR J0348+0432, Pulsar with white dwarf companion
- Astronuc
- · Replies 4 ·
Graduate How does one measure the angle of Sun and Mars at different time?
- roufeng
- · Replies 18 ·
Graduate Standing in nothingness before the Big Bang
- Swimfit
- · Replies 62 ·
Undergrad Coronal Mass Ejections - Would we be able to
- astriveforprog
- · Replies 13 ·
Graduate Derivation of the quadrupole moment of gravitational wave
- Shan K
- · Replies 1 ·
Graduate Is Self-Adjusting Isotropy a Valid Concept in Gravitational Theory?
- Jonathan Scott
- · Replies 2 ·
Graduate Restframe U-V vs V-J colour-colour plot
- Ikaros
- · Replies 4 ·
Graduate Are Most Galaxies on Collision Courses Despite Dark Energy's Influence?
- USCadam89
- · Replies 2 ·
Undergrad If energy cannot be created or destroyed, what is the universe?
- MathJakob
- · Replies 4 ·
Graduate Hulse-Taylor pulsar and GR what if orbital velocities were higher?
- adrian_m
- · Replies 4 ·
Stargazing What Can I See with My Celestron FirstScope?
- flash ace
- · Replies 7 ·
Graduate Could Big Rip expansion separate virtual particles and create a new Big Bang?
- nicoo
- · Replies 17 ·
Graduate Universe is fine tuned for life
- {~}
- · Replies 32 ·
High School What causes gravitational force?
- kalidas1992
- · Replies 21 ·
Graduate Could Stereoscopic Imaging with Heliocentric Satellites Revolutionize Astronomy?
- Bob__
- · Replies 7 ·
Graduate How much denser is a neutron star than an atom?
- ilikescience94
- · Replies 14 ·
Undergrad How did Kepler know that the time of Mars' orbit was 687 days ?
- azoulay
- · Replies 21 ·
Undergrad Theories on the beginning of the universe before the Big Bang Theory
- francesco314
- · Replies 1 ·