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 How Far Can a 300 mm Telescope Resolve a Double Star Separated by 10 AU?
- radiosource
- · Replies 1 ·
Graduate Energy density of massive neutrinos
- nicksauce
- · Replies 3 ·
Graduate Calculating Neutrino Binding in Gravitational Potentials
- Spinnor
- · Replies 3 ·
Graduate Big Brain Theory: Have Cosmologists Lost Theirs?
- SF
- · Replies 18 ·
Undergrad Changing Earth's Rotation: Impact on Gravity and Mass Loss
- Warmacblu
- · Replies 22 ·
Graduate A god switchs off the nuclear fires in our sun tonight, do I have to worry?
- Spinnor
- · Replies 7 ·
Graduate Gravity and developments in GR after WMAP 5 year data
- Wallace
- · Replies 42 ·
Graduate How do we accurately measure the speed of light without frames of reference?
- Yadukrishnan
- · Replies 3 ·
Graduate Understanding Time: Special Relativity & Earth's Reference Frame
- Descartz2000
- · Replies 2 ·
Graduate What is the boundary of the observable universe in the Milne universe?
- micomaco86572
- · Replies 5 ·
Graduate Are L4 and L5 Lagrange Points Stable with M1/M2 ≥ 24.96?
- E92M3
- · Replies 1 ·
Graduate The equation of state of radiation
- micomaco86572
- · Replies 5 ·
Undergrad Size of the Universe: Estimate Conflicts & Layman's Guide
- Hasu
- · Replies 18 ·
High School Period of Aquila (Latin: 'eagle') constellation
- mabs239
- · Replies 11 ·
Graduate I need to shield Earth's Gravitational force.
- frozenguy
- · Replies 1 ·
Graduate Could gravitational waves form interference patterns?
- evanghellidis
- · Replies 27 ·
Graduate Why Do Distant Galaxies Appear Further Apart Than Expected?
- S.Vasojevic
- · Replies 27 ·
Graduate Is the Kinematics of 3D Space Truss Affected by Closed Loops in the System?
- topcomer
- · Replies 35 ·
Graduate How Do Photons from Very Old Galaxies Reach the Hubble Telescope?
- bkilkerr
- · Replies 1 ·
Graduate Is Gravitational Shear Limited to Gravitational Lensing?
- beech
- · Replies 1 ·
Graduate Big Bang: Definition of Universe Area
- Pjpic
- · Replies 5 ·
Graduate How Does Time Dilation Impact the Calculated Age of the Universe?
- ravisastry
- · Replies 4 ·
Undergrad Age of Stars: Calculating & Assessing Helium
- adkinje
- · Replies 17 ·
Undergrad Stars and planets made out of antimatter?
- SpaceGuy50
- · Replies 24 ·
Graduate A snip making fun of the concept of dark matter- why is this incorrect?
- Galteeth
- · Replies 30 ·
Graduate Help with Black Holes: Determining Energy at Distance r
- zzzaaaappp
- · Replies 1 ·
Sky Color on Planet Orbiting Zeta Tucanae (F9V, CI 0.576)
- dsisk559
- · Replies 2 ·
Graduate Did the universe expand from a point?
- murrdpirate0
- · Replies 5 ·
High School What Can We Learn About the Zodiac Constellations on October 20th?
- mabs239
- · Replies 3 ·
Graduate How is orbital energy transferred between celestial bodies?
- dschmidt12
- · Replies 4 ·
High School Why do planets of our solar system orbit in rings not spheres?
- Schoomy
- · Replies 2 ·
Graduate Big Bang - No Single point of Expansion
- earamsey
- · Replies 67 ·
Graduate Stuff I always wondered about astrophysics
- FayeKane
- · Replies 51 ·
Graduate Dark energy might be modif'n of GR different from cosmo constant.
- marcus
- · Replies 21 ·
Graduate Cosmic micro-wave background, also cosmic gravitation-wave background?
- Spinnor
- · Replies 8 ·
High School Difference between axial tilt and inclination
- Philosophaie
- · Replies 7 ·
Undergrad Gravitational Attraction: Could Dark Matter be Explained?
- mviswanathan
- · Replies 7 ·
Undergrad How can you estimate mass of star?
- dsisk559
- · Replies 1 ·
High School What is the Law of Gravity and Why Do Masses Attract?
- Bjarne
- · Replies 6 ·
Undergrad Books on Astrophysics/Nucleosynthesis
- bgreer76
- · Replies 1 ·
Graduate Cosmic microwave background radiation
- Mihael@@/&
- · Replies 6 ·
Graduate Understanding Spacetime: Clarifying Misconceptions and the Role of Gravity
- Simon76
- · Replies 1 ·
Undergrad Calc. Temperature of CMB | Textbook Info
- micomaco86572
- · Replies 14 ·
Undergrad Does Earth's eccentricity change?
- DaveC426913
- · Replies 6 ·
Graduate Will Black Dwarfs Become Iron Stars in 10^1500 Years?
- SpaceGuy50
- · Replies 9 ·
Graduate Are Black Holes the Key to Understanding the Big Bang?
- qmpash
- · Replies 27 ·
What would you throw in a black hole?
- Pattonias
- · Replies 59 ·
High School Can Pluto Twinkle Like Stars from Earth?
- Loren Booda
- · Replies 13 ·
Graduate Ellipticals vs. spirals colliding
- Loren Booda
- · Replies 5 ·
New Calculated Trajectory for the Apophis asteroid
- CFDFEAGURU
- · Replies 4 ·
Graduate Q: About the relations bitween the inflation and matter's properties
- Cosmicon
- · Replies 9 ·
Graduate Where do Quantum corrections matter?
- Galteeth
- · Replies 8 ·
High School Question about our solar systems orbital path through the milky way
- greyfox
- · Replies 13 ·
Graduate Unit transformation of Cosmological Constant ?
- icarus2
- · Replies 5 ·
Graduate Which of 4 Universe Scenarios Do You Believe In?
- Dmitry67
- · Replies 6 ·
Graduate Antimatter's role in the architecture of the universe
- Carid
- · Replies 36 ·
Undergrad Does the Cosmos Have a Preferred Direction?
- madkid
- · Replies 4 ·
Undergrad Astroid Toutatis year 2012 has effects on Earth and moon
- RT4765
- · Replies 14 ·
Undergrad Measuring Sea Level: Tides, Elevation & Distance from Earth's Center
- Philosophaie
- · Replies 10 ·
Undergrad What Is the Weak Field Limit?
- keepitmoving
- · Replies 5 ·
Graduate Why is it customary to assume that the vacuum energy contribution is neglible?
- Galteeth
- · Replies 13 ·
Undergrad What Catastrophe Could Render Earth Uninhabitable in 40-60 Years?
- Steve Walmsle
- · Replies 9 ·
High School Witnessing the Cosmic Horizon: A Speedy Adventure
- xMonty
- · Replies 9 ·
Graduate Can CFD Techniques Revolutionize Astrophysics Research?
- HossamCFD
- · Replies 15 ·
Graduate How to Plan a Mission from LEO to the Itokawa Asteroid?
- brash
- · Replies 4 ·
Graduate Space Elevator Vehicle: Acceleration After Cable Release
- nuclear tan
- · Replies 3 ·
Undergrad Is Aeronautics the Future for Aspiring Astrophysicists?
- vorcil
- · Replies 1 ·
Graduate How does the event horizon of a Schwarzchild black hole nucleate and develop?
- oldman
- · Replies 22 ·
Graduate Dark Energy & the Law of Thermodynamics
- S.Vasojevic
- · Replies 31 ·
Undergrad Why do physicists claim the universe came from nothing?
- AdkinsJr
- · Replies 6 ·
Graduate Theoritically how far can one see in the universe
- mviswanathan
- · Replies 29 ·
Undergrad Sidereal Time: Clarifying Contradictory Definitions
- Starproj
- · Replies 1 ·
Undergrad Can Light Really Be Trapped by a Black Hole?
- re-undefined
- · Replies 14 ·
Graduate Gravitational slingshot as a weapon
- fillindablank
- · Replies 9 ·
Graduate Black Hole Energy/Galactic Plane
- NIXSIX5
- · Replies 3 ·
Undergrad Why is it difficult to imagine nothingness and infinity?
- ElaMiNaTo
- · Replies 12 ·
High School Why do planets rotate on their axes?
- kashiark
- · Replies 12 ·
Graduate Is space warped, or is matter expanding?
- Modman
- · Replies 6 ·
Undergrad Does Doppler effect change the energy of emitted light?
- neurobio
- · Replies 11 ·
Graduate Space Expansion: Is Gravity the Cause?
- keepitmoving
- · Replies 2 ·
High School What are the major differences between the 8 planets of our solar system?
- Databank
- · Replies 3 ·
Graduate Black Hole Dimensions: Reversing the Universe's Expansion
- Cosmicon
- · Replies 12 ·
Undergrad Why Are Galaxies Accelerating Away?
- prysdieheer
- · Replies 38 ·
Graduate The Reissner-Nordstrom metric
- Orion1
- · Replies 3 ·
Earth from Space: Fresh News at Just $148
- Borek
- · Replies 7 ·
Graduate Hypothetical space station orbiting inside a plasma torus
- Pennarin
- · Replies 2 ·
High School Some quesitons about Sun and Earh
- cshum00
- · Replies 5 ·
Undergrad Is there something that Sun actually absorbs?
- looka
- · Replies 16 ·
High School Expanding Universe: Galaxies & Matter Explained
- Rubix
- · Replies 5 ·
Undergrad How can I calculate the tilt of the Earth using trigonometry?
- Philosophaie
- · Replies 1 ·
Graduate What can be detected in chunk of vacuum?
- looka
- · Replies 10 ·
Graduate Why does power spectrum is calculated at the radiation/matter epochs?
- chronnox
- · Replies 1 ·
Graduate Black Hole Collisions: What Happens?
- Pjpic
- · Replies 31 ·
High School Why do astronauts describe the smell of space as strong, metallic, and unique?
- WhoWee
- · Replies 10 ·
Graduate How Does the Big Bang Theory Address Apparent Violations of Established Physics?
- PhoenixByrd
- · Replies 26 ·
Graduate Is the Universe Fine-Tuned for Androids?
- marcus
- · Replies 10 ·
Graduate A hypothetical and impossible solution to the origin of the Universe.
- Pattonias
- · Replies 11 ·
High School Picture of Our Galaxy: How We Captured It
- jobyts
- · Replies 35 ·
Graduate Potential valleys in our solar system
- dianaj
- · Replies 2 ·
High School Astronomy vs Cosmology: Understanding the Differences Explained
- pixel01
- · Replies 4 ·