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
High School Understanding Kepler's Laws and Parallax in Astronomy
- Wellsi
- · Replies 6 ·
Graduate Dark Matter Evidence: Baryonic & Non-Baryonic
- SupersonicMan
- · Replies 13 ·
Graduate Why Doesn't This Black Hole Emit X-rays?
- Labguy
- · Replies 1 ·
Graduate Is the Axis of Evil still a valid feature in the CMB data?
- Garth
- · Replies 8 ·
Graduate Could Multiple Stars Be Hiding in Eta Carinae's Nebula?
- Wellsi
- · Replies 2 ·
Graduate Is gravitational repulsion between matter and antimatter causing accelerated expansion?
- Rip
- · Replies 21 ·
Graduate Why Is the Chandrasekhar Limit Estimated with Unrealistic Assumptions?
- quasar987
- · Replies 3 ·
Stargazing First up is M13, 20 exposures of 30 seconds
- Brinx
- · Replies 9 ·
Graduate Scientific explanation of the Universe
- Handsome_Dick
- · Replies 8 ·
Graduate Does G vary because of Mach's Principle?
- Garth
- · Replies 13 ·
Graduate How Do Upcoming Surveys Constrain Cosmological Models and Dark Energy?
- SupersonicMan
- · Replies 3 ·
Stargazing Telescope Advice for Military Employee in Middle East - $1000 - $2000
- gqusaf
- · Replies 7 ·
Graduate Can Photons Emit Gravitons in the Absence of Black Holes?
- .ultimate
- · Replies 2 ·
Undergrad How close can a star approach a black hole before tidal forces tear it apart?
- hasman
- · Replies 14 ·
Graduate Can two black holes accelerate to light speed before colliding?
- ocalhoun
- · Replies 2 ·
Undergrad What is the medium that fills space?
- nannoh
- · Replies 11 ·
Undergrad Are Black Holes Universal Recycling Bins?
- Epircus
- · Replies 15 ·
Graduate The Possibility of Curved Spacetime, Black Holes, and Big Bang. .
- cosmopot
- · Replies 1 ·
High School Can satellites view the far side of the sun simultaneously?
- RJ Emery
- · Replies 9 ·
Graduate WMAP and Big Crunch: Is the Universe's Fate Sealed?
- vincentm
- · Replies 1 ·
Graduate Can science and technology give us complete control over the universe?
- octelcogopod
- · Replies 2 ·
Graduate Where can I find information on binary pulsar Lagrangian formulations?
- Logarythmic
- · Replies 1 ·
Graduate Can Black Holes Transfer Matter Between Universes?
- meph
- · Replies 23 ·
Undergrad If Saturn floats, then what happens?
- godwinfh
- · Replies 2 ·
Undergrad The Hubble Ultra Deep Field
- russ_watters
- · Replies 39 ·
Graduate Is Dark Energy Consistent with a Cosmological Constant?
- Chronos
- · Replies 37 ·
Graduate So what's the currently accepted gravity theory?
- Sariaht
- · Replies 3 ·
Undergrad Galaxy defy Kepler? True or bull?
- MonstersFromTheId
- · Replies 21 ·
Astronomy Song Game - Get Creative!
- FeynmanMH42
- · Replies 19 ·
High School Converting parsecs to Mega-parsecs
- Krissy0612
- · Replies 1 ·
Graduate Would the sky appear redder if the universe ends in a Big Rip?
- kaiser
- · Replies 6 ·
Graduate Is Order at the Edge of Chaos a Valid Explanation for the Universe's Operation?
- elan
- · Replies 4 ·
Graduate What is the relationship between gravity and dark energy in black holes?
- Sariaht
- · Replies 6 ·
Graduate Dark Energy Discoevery [NASA Teleconference 16 Nov]
- neutrino
- · Replies 26 ·
Undergrad The Expanding Universe: Why Stretching is the Only Explanation
- Tim.thelion
- · Replies 1 ·
Undergrad Choosing a programming language for dark matter galaxy simulations
- physicsatiztech
- · Replies 3 ·
High School When do Earth, Sun and galactic center align this year?
- osirisisis
- · Replies 9 ·
Graduate Is the Universe Alive? The Fascinating Theory of an Evolving Cosmos
- RAD4921
- · Replies 5 ·
Undergrad Is the Evolution of Matter Density Proportional to a^3 or 1/a^3?
- aquabug918
- · Replies 1 ·
Undergrad Is Gravity Like a Bed Sheet and Baseball?
- Nexus555
- · Replies 6 ·
Graduate Has the Three Body Problem Ever Been Solved?
- tim_lou
- · Replies 11 ·
Undergrad Stars colliding/meeting up with each other
- Bladibla
- · Replies 2 ·
Graduate Speed of light and universal expansion.
- thewiseman
- · Replies 3 ·
Undergrad Universe expansion VS speed of light
- taylaron
- · Replies 20 ·
Taking pictures of the Mercury transit in 2006
- robphy
- · Replies 13 ·
What was the name of the Mars-sized planet that collided with Earth?
- kleinma
- · Replies 15 ·
Is There Liquid Beneath Saturn's Monster Storm?
- turbo
- · Replies 3 ·
High School Time taken to form universe, religion vs science.
- alias25
- · Replies 5 ·
Undergrad What is Space Physics and How Does it Relate to Cosmology and Astrophysics?
- bkvitha
- · Replies 9 ·
Graduate Where Does The Hawking Radiation Go?
- Silverbackman
- · Replies 23 ·
Creating a Time Machine: Can it be Done?
- ritwik06
- · Replies 2 ·
Graduate How could supermassive black holes form fast enough for distant quasars?
- capnahab
- · Replies 6 ·
Undergrad Earth changing tangental velocity?
- TuviaDaCat
- · Replies 1 ·
High School No storm on Earth lasts like the one on Jupiter
- DaxInvader
- · Replies 19 ·
What Defines Our Individual Universes?
- vadslram
- · Replies 2 ·
Undergrad How Would Changes in the Sun's Mass and Earth's Velocity Affect Earth's Orbit?
- ritwik06
- · Replies 7 ·
Graduate Does the PA show that DM/DE is dynamically important in the outer solar system?
- Garth
- · Replies 18 ·
Undergrad Pickup truck analogy for the expanding universe's size
- Chaos' lil bro Order
- · Replies 10 ·
Black spot visible in sun photos from April 2006
- mik0930
- · Replies 2 ·
Graduate Could Matter Exist in a Black Hole on the Level of Quarks?
- Playdo
- · Replies 1 ·
Graduate What if the Universe had this cosmology
- aeroboyo
- · Replies 6 ·
Graduate Max Gravity Boost: Hyperbolic Trajectory from Jupiter
- tony873004
- · Replies 5 ·
High School A question related to solar system
- ultranet
- · Replies 2 ·
High School What Can You See in the Night Sky with the Current Comet?
- George Jones
- · Replies 3 ·
Can the Hubble Repair Mission Extend the Life of NASA's Beloved Telescope?
- turbo
- · Replies 3 ·
Undergrad Would Earth's Rotation Change If the Moon Exploded?
- Neohaven
- · Replies 11 ·
High School The sun's gravitational pull on the earth
- Mono182
- · Replies 55 ·
Undergrad Why are the emission lines in the Crab Nebula split into two?
- judi6070
- · Replies 9 ·
What is the difference between a nebula and a death star?
- ultranet
- · Replies 6 ·
High School Varibles/Eclipsing Binary systems
- Cyclotron
- · Replies 2 ·
Graduate Newtonian derivation of Friedmann equation
- Mike2
- · Replies 2 ·
High School Does a Geo-Synchronous Satellite Catch a Shadow?
- ucmassahana
- · Replies 3 ·
Graduate Is the CERN particle accelerator risking a phase change in the Universe?
- ptalar
- · Replies 6 ·
Graduate On black holes and the implications according to me.
- Arithus
- · Replies 1 ·
Undergrad Are There Habitable Planets Orbiting Alpha Centauri?
- AA Institute
- · Replies 10 ·
Undergrad When will Andromeda galaxy look as big as the moon today?
- waht
- · Replies 8 ·
Undergrad What fraction of Earth's surface heat comes from the interior?
- tony873004
- · Replies 6 ·
Undergrad Lunar Phase Change with Reversed Moon Orbit
- smurfride
- · Replies 3 ·
High School What Is Galactic Motion and How Is It Explained?
- anaguma
- · Replies 6 ·
Undergrad Why hasn't the Kuiper Belt coalesced into a planet?
- FeynmanMH42
- · Replies 1 ·
Can high IQ help perceive universal patterns and cycles?
- ouchparadoxhurts
- · Replies 11 ·
Undergrad IAU proposal for 12 planets including Ceres, Charon, and Xena
- BobG
- · Replies 36 ·
High School What is the sun's conveyor belt and how does it relate to solar storms?
- dongcute
- · Replies 3 ·
Solar Storm Ideas: Share Your Thoughts Here
- dongcute
- · Replies 2 ·
Graduate Effect of dark matter on solar system dynamics
- Loren Booda
- · Replies 14 ·
Graduate Does Kepler's Third Law Account for Dark Matter in Galaxy Rotation Curves?
- FeynmanMH42
- · Replies 21 ·
Undergrad Solar wind + Weak magnetic field = No water?
- dongcute
- · Replies 4 ·
Graduate Turbulence pressure in convection zone
- Helios
- · Replies 2 ·
Graduate My calculation of the density of the universe at (10^60)th of its present age
- kmarinas86
- · Replies 2 ·
Undergrad What Properties Can Be Extracted from the Hipparcos Catalogue?
- covers
- · Replies 6 ·
Undergrad ExoPlanet Hunting: Observing Stars with Celestron C11 XLT
- Cyclotron
- · Replies 4 ·
Graduate How large would a human body be at the universe's critical density?
- Chaos' lil bro Order
- · Replies 3 ·
Stargazing How does the reappearance of Io during an eclipse relate to linear lighting?
- big man
- · Replies 4 ·
Saturn's rings backlit by the sun
- FeynmanMH42
- · Replies 1 ·
Graduate Limitations on cosmology for observers restricted to Earth
- Loren Booda
- · Replies 3 ·
Graduate What Theories Explain Quasar Energy Concentration and Their Challenges?
- Tsunami
- · Replies 2 ·
Graduate Global flatness, curvature and expansion of the universe
- cesiumfrog
- · Replies 8 ·
Graduate Universal expansion reaching a point of equiblirium
- Zegnarfol
- · Replies 3 ·
Graduate What Are the Effects of Extreme Pressure on Electron Degenerate Matter?
- Azael
- · Replies 7 ·
Graduate Big Bang and Simultaneity question
- master_gopher
- · Replies 2 ·