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 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 Mass of the Universe: What's the Real Number?
- sWozzAres
- · Replies 32 ·
Graduate Ratio of positive to negative hydrogen ions in the universe?
- zmorris
- · Replies 1 ·
Undergrad Would the outer planets in our solar system survive a supernova event?
- 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 ·
What Makes the Metric System Essential for NASA's Mars Mission?
- 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 A quick question from a layman about folding space time
- 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 Understanding the accelerating universe.
- Damo ET
- · Replies 15 ·
Graduate How can we claim the Universe is 13.7 billion years old?
- Baggins101
- · Replies 5 ·
Graduate Where Will Our Universe End? An Unanswerable Mystery
- 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 Is Time's Arrow Anomaly Explained by Planck's Constant? | Physics Concept"
- 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 Matter vs Antimatter: Why Does Universe Have More of the Former?
- 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 What Are the Key Findings of the Pulsar Radio Astronomy Experiment?
- 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 the Big Rip Lead to Another Big Bang?
- nicoo
- · Replies 17 ·
Graduate Universe is fine tuned for life
- {~}
- · Replies 32 ·
High School Gravitational Force: What Causes It?
- kalidas1992
- · Replies 21 ·
Graduate Could Stereoscopic Imaging with Heliocentric Satellites Revolutionize Astronomy?
- Bob__
- · Replies 7 ·
Graduate Neutron Stars vs Atoms: A Comparison
- 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 ·
Graduate Guth, Kaiser and Nomura versus Ijjas,Steinhardt and Loeb
- skydivephil
- · Replies 1 ·
Graduate Entanglement of Higgs boson to explain dark energy
- pforeman
- · Replies 4 ·
High School Do less bright stars have redder spectrum?
- tarekatpf
- · Replies 2 ·
Graduate How Do We Know the Universe Started from a Single Point?
- bennybob
- · Replies 9 ·
Graduate Question about extreemly large black holes.
- mrspeedybob
- · Replies 2 ·
Undergrad Forming of our Galaxies or Atmosphere
- Ewrim
- · Replies 1 ·
Graduate Any books that explain the origin of physics stuff after the Big Bang?
- tarekatpf
- · Replies 9 ·
Graduate Gravitational Attraction, Electromagnetic Radiation and Dark Matter
- esmeralda4
- · Replies 1 ·
Undergrad What happens to meteors after they vaporize?
- mrspeedybob
- · Replies 1 ·
Graduate Magnetic confinment of plasma/sustained fusion
- CSantos
- · Replies 1 ·
Graduate Would a single black hole form in the big crunch scenario?
- ilikescience94
- · Replies 5 ·
Undergrad All stars in Milky Way equal one square light year?
- rrw4rusty
- · Replies 10 ·
High School What Pope wanted Galileo to include in his book
- LalithP
- · Replies 1 ·
High School How Does Sunlight Reach the Moon During a Full Moon?
- Hepic
- · Replies 22 ·
Undergrad Is Empty Space Truly Void of Energy and Matter?
- vivekfw66
- · Replies 5 ·
Graduate In the beginning there was one force
- CaptainHammer
- · Replies 1 ·
Graduate What is the significance of the Eridanus Supervoid in the universe?
- BOAS
- · Replies 2 ·
Undergrad Doppler effect vs expansion effect on wavelength
- rogerperkins
- · Replies 2 ·
High School Questions About Things in Orbit and Why They Don't Descend
- oneamp
- · Replies 7 ·
Graduate Synchronization of time impossible?
- chowyunfat321
- · Replies 9 ·
Undergrad Kepler's 2nd.law and calculation
- shounakbhatta
- · Replies 4 ·
Graduate Could an eliptical galaxy exist with an axis of rotation?
- ilikescience94
- · Replies 4 ·