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 Universal constants changing into new ones?
- powersgood
- · Replies 1 ·
Graduate More about that gamma burst (the brightest ever recorded)
- marcus
- · Replies 4 ·
Graduate Antimatter gravity hypothesis-question
- orion24
- · Replies 9 ·
Graduate Zeroth Law of Thermodynamics
- Beastcloud
- · Replies 1 ·
Graduate Can a Star Exist with Negative Pressure?
- astromandi
- · Replies 8 ·
Graduate Something about The Beginning I could never figure out
- Bible Thumper
- · Replies 13 ·
Undergrad Sudan impact prediction: first predicted asteroid impact?
- tony873004
- · Replies 18 ·
Stargazing What can we observe with 25+ meter telescopes?
- zankaon
- · Replies 1 ·
Graduate What is the Solar Evaporation Time?
- Orion1
- · Replies 10 ·
Graduate Singularity Theorem Proof on IanBay's Site
- julian
- · Replies 11 ·
High School Hurricane size whirlpool on the Sun
- h.g.Whiz
- · Replies 1 ·
Graduate ICosmo: an Interactive Cosmology Package
- wolram
- · Replies 1 ·
Undergrad Throwing paper airplane towards space question
- yoduh
- · Replies 4 ·
Graduate Singularity in reference to blackholes and right before the big bang?
- fa7alerr0r
- · Replies 7 ·
High School Why is winter coldest when Earth is closest to the Sun?
- Philosophaie
- · Replies 8 ·
Graduate Virial Theorem in Stellar Dynamics
- cepheid
- · Replies 10 ·
Undergrad Why is the closing velocity of Andromeda and our galaxy so high?
- zankaon
- · Replies 3 ·
Graduate JDEM/Beyond Einstein, is it still alive?
- Coin
- · Replies 3 ·
Graduate Why is only 14% of solar hydrogen burned in 10 billion years?
- Thoth
- · Replies 2 ·
Undergrad How can light travel time measure a cluster's age if it's older than Earth?
- wolram
- · Replies 1 ·
Undergrad A theory that universe is infinite
- cam875
- · Replies 9 ·
Graduate Where Did the Superforce Go After Splitting?
- strangemuon
- · Replies 6 ·
Graduate Abundances for Small Magellanic Cloud
- Lorna
- · Replies 3 ·
Undergrad Calculating the Earth's Elliptical Orbit around the Sun
- Philosophaie
- · Replies 7 ·
Graduate How Does Gravity Affect the Speed of Time Flow?
- strangemuon
- · Replies 5 ·
Graduate Will a Halved Earth Orbital Period Affect Solar and Sidereal Days Differently?
- Carolyn
- · Replies 2 ·
High School Why Do We See the Same Stars All Year?
- AlexaStar
- · Replies 9 ·
What are we waiting for to get into space?
- ManDay
- · Replies 32 ·
What New Images Did Messenger Capture During Its Mercury Fly-by
- LowlyPion
- · Replies 1 ·
Graduate Did initial particles and forces come from somewhere before the Big Bang?
- cam875
- · Replies 5 ·
Graduate My idea on what happened to all the antimatter.
- derek.basler
- · Replies 39 ·
Graduate Center for Exoplanets and Habitable Worlds (news of improved instrumentation)
- marcus
- · Replies 1 ·
Graduate Counting Subfields of F_p in Algebra
- Diffy
- · Replies 1 ·
High School Where Can a 9th Grader Find Advanced Astronomy Resources?
- NOBARTHOLEM
- · Replies 12 ·
Graduate What Aspects of the Universe Were Inflated During the Big Bang?
- Simulacrum
- · Replies 8 ·
Undergrad Figuring out mass of a star based on diameter
- NOBARTHOLEM
- · Replies 2 ·
High School Prove that the earth goes around the sun
- rattis
- · Replies 42 ·
Undergrad What does 3-sigma confidence mean in astronomy measurements?
- cepheid
- · Replies 1 ·
Graduate Do Population II Stars Have Planets?
- Loren Booda
- · Replies 2 ·
Graduate Should the universe's definition include higher spatial dimensions?
- epkid08
- · Replies 1 ·
Undergrad Can Light Travel Forever in Space While Baryonic Matter Decreases?
- WCOLtd
- · Replies 10 ·
Graduate Do Orbital Inclinations Affect Hohmann Transfer Efficiency?
- 1onenil0
- · Replies 2 ·
Graduate Why the standard model leaves force unification incomplete
- wolram
- · Replies 1 ·
Graduate Are We Real? Universe Baryons, Photons, Asymmetry
- spidey
- · Replies 5 ·
High School Are G-forces smaller when traveling in space?
- Drbazz
- · Replies 4 ·
Undergrad Light travelling through a black whole
- Twistedfate
- · Replies 3 ·
Undergrad Apparent Magnitude of Binary Star System
- Gammage
- · Replies 1 ·
Graduate Can a black hole be stabilized through Hawking radiation and mass feeding?
- bassplayer142
- · Replies 3 ·
Graduate Large-scale bulk flow of 700 galaxy clusters detected via KSZ effect
- marcus
- · Replies 8 ·
High School Why Do Stars Appear to Move Away From Us?
- maybeimstupid
- · Replies 6 ·
Graduate Is the Observable Universe Really Limited to 13.7 Billion Light-Years?
- thenewmans
- · Replies 4 ·
Graduate Time coordinate in the rain frame
- stevebd1
- · Replies 2 ·
Undergrad No Green Stars: What's the Story?
- DecayProduct
- · Replies 1 ·
Graduate How can neutron stars exceed the Chandrasekhar limit?
- soandos
- · Replies 2 ·
High School Why the earth is rotating along its axis?
- paglren
- · Replies 30 ·
Graduate Dark Energy, the Cosmological Constant, General Relativity and you
- Wallace
- · Replies 13 ·
Graduate Does a Schwartzchild blackhole have a singularity?
- Phrak
- · Replies 9 ·
Stargazing Bushnell 675x5" reflector showing only black through eyepieces
- Shilly
- · Replies 7 ·
Undergrad Benchmark redshifts to tell your kid brother or sister
- marcus
- · Replies 4 ·
Graduate Couple of Bounce Questions Regarding Black Holes / Universe
- PhysicsDilettante
- · Replies 7 ·
Undergrad Does the moon's orbital plane wobble, and what is its period?
- pixel01
- · Replies 1 ·
Graduate Can We Reach and Surpass the Universe's Edge?
- montecristo42
- · Replies 3 ·
Undergrad How does background radiation from the early universe reach us now?
- Lazzini
- · Replies 7 ·
Undergrad Single Dish Radio Astronomy Inefficiencies
- Sanjay87
- · Replies 1 ·
High School How much energy is needed to move 1 ton in space?
- raezair
- · Replies 4 ·
Graduate How long does it take for a white dwarf to go supernova through accretion?
- Sanjay87
- · Replies 3 ·
Stargazing Is a Radio Telescope Less Sensitive on the Galactic Plane?
- Sanjay87
- · Replies 5 ·
How many more dwarf planets can be named after deities?
- Utwig
- · Replies 3 ·
Undergrad Can we reach Mars using thrusters and maintain a constant velocity?
- Nibles
- · Replies 37 ·
Undergrad Azimuth and altitude of Vega: do they change over days and months?
- Confused_Star
- · Replies 4 ·
Graduate What Can We Learn from the Distant Gamma Ray Burst GRB 080913?
- wolram
- · Replies 1 ·
Undergrad The sum of all energy in the universe
- curiouschris
- · Replies 16 ·
Undergrad Geological evidence for a 3600-year Planet X cycle
- Utwig
- · Replies 6 ·
Graduate Can anything fall into a black hole?
- Phrak
- · Replies 2 ·
Graduate Why Do We Get an Einstein Cross Instead of a Skewed Ring?
- Unredeemed
- · Replies 2 ·
High School Building a telescope with a 6" mirror of focal ratio 3.3
- vincentm
- · Replies 18 ·
Graduate Why the balloon analogy doesn't describe the universe
- Pjpic
- · Replies 74 ·
Graduate The inconsistent current picture of the universe?
- Artlav
- · Replies 10 ·
Graduate Does the expansion of the universe violate conservation of energy?
- Anzas
- · Replies 6 ·
Undergrad Earth's magnetism and Sun's temperature
- bonekeeper
- · Replies 1 ·
Graduate Identifying Cepheid Variables from Spectrum
- Galaxy111
- · Replies 6 ·
Graduate Loop Quantum Gravity: Is the Speed of Light a Function of Wavelength?
- renerob
- · Replies 4 ·
Graduate Is dark energy constant to emtpy space?
- azzkika
- · Replies 1 ·
Graduate Collapse calculation (surce code?)
- quartz6
- · Replies 2 ·
Stargazing Can a shaving mirror work as a primary mirror in a reflecting telescope?
- josue2503
- · Replies 3 ·
Graduate Do Bounce Theories Consider the Role of Elements in Cosmic Collapses?
- wolram
- · Replies 3 ·
Graduate Common parlance for Cosmo forum, proposed
- marcus
- · Replies 14 ·
Graduate Relative Velocity: Can We Exceed the Speed of Light?
- epkid08
- · Replies 1 ·
High School Calculating simple theoretical parallax error
- dink87522
- · Replies 1 ·
High School What Is the Fourth Dimension: Time, Space, or Something Else?
- xCross
- · Replies 5 ·
Undergrad Hundreds of Rogue Black Holes in Our Galaxy - Is Earth at Risk?
- hammertime
- · Replies 2 ·
Graduate Matter, Antimatter, and Micro Black holes
- derek.basler
- · Replies 3 ·
Graduate Origin of the Uinverse / baby universe
- TalonD
- · Replies 9 ·
Graduate Hydrodynamics of structure formation
- wolram
- · Replies 2 ·
Graduate Eclipse cycles for two moons orbiting a 722-day planet
- Super**Nova
- · Replies 2 ·
Undergrad How do we know how much visible matter exists?
- Xezlec
- · Replies 4 ·
Undergrad Orbital question(elliptical vs circular orbit)
- t4chan
- · Replies 8 ·
Undergrad Evaluating the age of a universe
- bigboi889
- · Replies 4 ·
Graduate Upper mass limit for ultra-massive black holes at 10^10 solar masses
- marcus
- · Replies 6 ·
Graduate Right after the bigbang, microblackholes were formed
- chhitiz
- · Replies 6 ·