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 Why Do Scalar Fields in Hybrid Inflation Model Diverge with Large Mixing Term?
- Accidently
- · Replies 5 ·
Graduate I would like to know more about the beginning of time in terms of
- nard
- · Replies 1 ·
Undergrad An impractical but difficult problem I stumbled upon
- bigmoneyhat
- · Replies 2 ·
Undergrad Mass of the core of the sun > mass of the sun?
- h1a8
- · Replies 3 ·
Graduate What would happen if two Earth size planets very slowly collided?
- blarznik
- · Replies 19 ·
Graduate Gravitational Variances in Space
- Maximilan
- · Replies 6 ·
Graduate How does the expansion of the universe stretch light?
- Peter Watkins
- · Replies 57 ·
Graduate Where are the future background microwaves now
- YummyFur
- · Replies 5 ·
Graduate The destruction of matter due to spaghettification
- Kamon2011
- · Replies 6 ·
Undergrad The gravitational tug of the Sun and the Moon on Earth - a question
- shirvanshah
- · Replies 4 ·
Graduate So, if space expands (measurements gets larger) in the presence of low
- keepit
- · Replies 2 ·
Undergrad Earth's gravitational field size.
- tentimes10
- · Replies 3 ·
High School Why can't Jet planes fly in space?
- Arjun Ar
- · Replies 14 ·
Old news as new news. Saturn 5 years ago.
- OmCheeto
- · Replies 11 ·
High School Preparing for a Career in Astrophysics: Advice for Young Scientists
- ratiugo
- · Replies 4 ·
Graduate Gravity, information, and cosmology (was Thoughts about the universe )
- mitchell porter
- · Replies 26 ·
Undergrad Earth Reaches Sun's Chromosphere: Timing Estimate
- blarznik
- · Replies 5 ·
Undergrad Where did the freidman equation come from?
- keepit
- · Replies 7 ·
Undergrad What do the Roman numerals in He II and O III mean in spectroscopy?
- Piano man
- · Replies 2 ·
Graduate Low entropy 3 mins from big bang query
- YummyFur
- · Replies 6 ·
Undergrad Super Novas Create Heavy Elements: Does this absorb or release energy?
- tvscientist
- · Replies 3 ·
Undergrad How Do You Calculate Star Rise and Set Times for Different Declinations?
- SpY]
- · Replies 2 ·
High School Observing the new supernova in Ursa Major (M101, pinwheel galaxy)
- tiny-tim
- · Replies 6 ·
Graduate Where would the observation of a static Universe have lead us?
- Tokage
- · Replies 4 ·
Stargazing Aperture fever and choosing your first telescope
- Vali x
- · Replies 1 ·
Graduate Is the total number of CMB photons finite or infinite?
- skydivephil
- · Replies 8 ·
Graduate How do neutron stars emit light?
- mrspeedybob
- · Replies 12 ·
Undergrad What is dark energy and what is it composed of?
- GarryS
- · Replies 2 ·
Graduate Could exotic matter stabilize a wormhole near a black hole for safe passage?
- Maximilan
- · Replies 23 ·
Graduate Is Dark Matter Denser in the Sun's Core and Does It Interact with Black Holes?
- sweet springs
- · Replies 6 ·
Graduate Is there anything in our universe that we can't model with a mathematical set?
- SeventhSigma
- · Replies 8 ·
Undergrad Collapsing Stars on the H-R diagram
- Zems
- · Replies 5 ·
Graduate What is the Current Value of the Mass Parameter for Quintessence?
- shadi_s10
- · Replies 4 ·
Graduate Gravitational Waves: Constructive Overlapping Effects
- debojoti
- · Replies 5 ·
Graduate Does size affect how time is perceived in a reference frame?
- GammaR4yBurst
- · Replies 1 ·
Undergrad Questions About Universe, Time & Fire: Answers Wanted
- Nogueira
- · Replies 8 ·
Graduate What does time mean in the context of BB theory?
- Johninch
- · Replies 15 ·
Graduate Can we use entangled particles for instant communication in space travel?
- Kenneth w
- · Replies 21 ·
Graduate Dark matter may be an illusion caused by the quantum vacuum
- moejoe15
- · Replies 15 ·
Graduate The redshift from recession or expansion
- micomaco86572
- · Replies 3 ·
Graduate A Static and Eternal Universe vs The Second Law of Thermodynamics
- Jocko Homo
- · Replies 17 ·
Graduate Searching for Microscopic Black Holes in the LHC
- kcajrenreb
- · Replies 6 ·
Graduate Light from the big Bang/Inflation
- Lazernugget
- · Replies 5 ·
Graduate Kepler's 3rd Law as a result of Newton's Laws
- takbq2
- · Replies 4 ·
Graduate Can sunspot prediction improve solar storm warnings?
- Astronuc
- · Replies 5 ·
Graduate The shape of black holes and their surroundings
- motorman
- · Replies 12 ·
Graduate Hawking Radiation and Particle/Anti-Particle
- chrispegg
- · Replies 2 ·
Undergrad How Can We See Light from Black Holes?
- DurgeshVYadav
- · Replies 3 ·
Graduate Correctly calculating gravity classically.
- Stupid Theory
- · Replies 3 ·
Graduate Is the Big Bang Theory a Linear Expansion or Something More Complex?
- Jpjangz
- · Replies 6 ·
Undergrad How Is Non-Thermal Radiation from the Sun Detected?
- skeptic2
- · Replies 3 ·
Graduate Does Vacuum Energy Drive the Expansion of the Universe?
- hylander4
- · Replies 14 ·
Graduate Why the Hubble Parameter Decreases to .85 of Today's Value
- keepit
- · Replies 2 ·
Graduate Dark matter as matter in parallel universes
- mrspeedybob
- · Replies 93 ·
Graduate How far away is the cosmic event horizon for us?
- mathal
- · Replies 8 ·
Graduate What caused the Big Bang singularity and what existed before it?
- Astralos
- · Replies 51 ·
Graduate How do we determine the age and elemental composition of a star?
- Routaran
- · Replies 2 ·
Graduate Chandrasekhar limit equation/white dwarf mass-radius relation
- Monkey Face
- · Replies 4 ·
Graduate The universe, planck time and the game of life
- thedragonbook
- · Replies 5 ·
Graduate Hawking's argument against a creator from the absence of time
- pkirhagis
- · Replies 64 ·
Graduate Can We Detect Signs of Life on Exoplanets Using Spectral Analysis?
- cph
- · Replies 6 ·
Undergrad Spectrum of the Sun vs black body
- fluidistic
- · Replies 3 ·
Undergrad 3D Model of the 2MASS Redshift Survey
- Vorde
- · Replies 5 ·
Undergrad Mass-energy equivalence and how it relates to the content of the universe
- smulc
- · Replies 3 ·
High School Is Tyche the Missing Planet in Our Solar System?
- bguidry17
- · Replies 8 ·
Graduate Expansion of the Universe Violates Conservation of Energy?
- Islam Hassan
- · Replies 6 ·
High School Interstellar Sighting: Who Will See It First?
- Stanleverlock
- · Replies 1 ·
Graduate Cosmic inflation and gravitational waves.
- RayYates
- · Replies 27 ·
Graduate Fractal dimension of the universe = 2?
- sbrothy
- · Replies 1 ·
High School Is 99% of the volume of the universe empty?
- -RA-
- · Replies 15 ·
High School Why do stars twinkle and why do some produce diffraction spikes?
- nhmllr
- · Replies 14 ·
Graduate Does Our Inability to Perceive Beyond the Universe Mean There's Nothing There?
- GADAMBA
- · Replies 3 ·
Graduate What causes starquakes on neutron stars?
- leeloshaw
- · Replies 1 ·
Graduate Can a Black Hole's Gravitational Field Alter Light's Path?
- obamallama
- · Replies 4 ·
Graduate What is spacetime made of?
- Lino
- · Replies 17 ·
Stargazing Vendor for telescope mirror cells?
- JeffKoch
- · Replies 8 ·
Graduate Supercomputer Galaxy Simulation
- Orion1
- · Replies 5 ·
Graduate Can the laws of physics apply before the universe existed?
- xanthose
- · Replies 10 ·
Thought I saw my first UFO today.
- Integral
- · Replies 12 ·
High School Why the process of recombination is called re combination?
- micomaco86572
- · Replies 3 ·
Graduate Scale invariance and bubble universes
- PhizzicsPhan
- · Replies 2 ·
Graduate How do gravity and cosmological expansion strike an equilibrium?
- cephron
- · Replies 6 ·
High School Why Don't We Move Backward When Jumping on a Rotating Earth?
- sankalpmittal
- · Replies 11 ·
Graduate PSR J1719-1438 and its planet-sized diamond companion
- Orion1
- · Replies 10 ·
Undergrad How Does General Relativity Explain an Object Thrown Up Returning Back?
- rajeshmarndi
- · Replies 10 ·
Stargazing What discoveries does the Very Large Telescope allow?
- Orion1
- · Replies 2 ·
Graduate Expansion of universe/what rate?
- Lorentz Trans
- · Replies 23 ·
Graduate Simple Supersymmetry Bites the Dust
- Dotini
- · Replies 1 ·
Undergrad Why Do Stars Flicker? Not Planets
- shaiqbashir
- · Replies 16 ·
Graduate Will there be matter at the end of the universe?
- phinds
- · Replies 17 ·
Graduate Antineutrinos After Big Bang: Where Are They?
- tut_einstein
- · Replies 3 ·
Graduate How can we see light from 400,000 years after the Big Bang?
- crazyloui
- · Replies 14 ·
Undergrad Can You Walk on a Brown Dwarf?
- DoggerDan
- · Replies 8 ·
Graduate How long does it take for a black hole to devour a star?
- tkav1980
- · Replies 2 ·
High School Was the early church right and Gallelio wrong?
- AtomicJoe
- · Replies 41 ·
Are all atomic particles the same age?
- AtomicJoe
- · Replies 3 ·
Graduate Why is it so accepted that matter falls into black holes?
- Astroboy123
- · Replies 33 ·
Graduate Is the universe Euclidean or does gravity make it hyperbolic?
- neginf
- · Replies 10 ·
Undergrad How many stars does one create and how many times can stars be
- decay33
- · Replies 1 ·
High School What was the curved white line near Jupiter on Aug 24 2011?
- a7d07c8114
- · Replies 4 ·