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 Something about The Beginning I could never figure out
- Bible Thumper
- · Replies 13 ·
Undergrad Will Sudan Experience a Predicted Minor Impact Tomorrow?
- tony873004
- · Replies 18 ·
Stargazing Discover the Capabilities of 25+ Meter Telescopes Beyond Engineering Projects
- 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 Earth's Orbit & Tilt in N. America: Winter Closest, Summer Farthest
- 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 Astrophysics Help: Calculating Mass of Hydrogen Converted in Sun Over 10B Years
- Thoth
- · Replies 2 ·
Undergrad The Secrets of the Universe: Measuring Age through Light Travel
- 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 The Big Bang: Where Did it Come From & Does Time Exist?
- 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 Simple question about certainty/confidence in astronomy
- 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 The Standard Model: Unified Forces or Unanswered Questions?
- 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 Detecting Bulk Motion of 700 Clusters with KSZ Effect: Results & Implications
- 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 Understanding the Chandrasekhar Limit: Neutron Stars & Spin Effects
- 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 Need Help - Learning to use a telescope
- 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 Question about the orbiting plane of the moon
- pixel01
- · Replies 1 ·
Graduate Can We Reach and Surpass the Universe's Edge?
- montecristo42
- · Replies 3 ·
Undergrad Background Radiation: Unraveling the Mysteries of the Universe
- Lazzini
- · Replies 7 ·
Undergrad Single Dish Radio Astronomy Inefficiencies
- Sanjay87
- · Replies 1 ·
High School Understanding Mass, Energy & Space: How Much Energy Does it Take to Move 1 Ton?
- 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 HELP .The Azimuth and Altitude of Star Vega
- 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 Does Geological Evidence Support the Existence of Planet X?
- 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 6" Mirror & Focal Ratio of 3.3 - $50
- vincentm
- · Replies 18 ·
Graduate More on Infinity: Why Does Balloon Analogy Not Describe 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 Shaving mirror for 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 Help Calculating Parallax Error - Physics Forums
- 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 Inventing Moons and their Eclilpses-help
- 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 BH mass limit, another structure formation clue?
- marcus
- · Replies 6 ·
Graduate Right after the bigbang, microblackholes were formed
- chhitiz
- · Replies 6 ·
Graduate Blue Shift objects; is there a list/table?
- sounddoctorin
- · Replies 5 ·
Graduate Is Ned's Calculator Mislabeling Angular Size Distance?
- meteor
- · Replies 3 ·
Undergrad Can Relativity Explain the Possibility of Aliens Visiting Earth?
- childsy
- · Replies 4 ·
Graduate Modifying Newtonian Gravitational Force
- 81+
- · Replies 3 ·
Graduate Oscillating universe and entropy
- sea100
- · Replies 5 ·