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 Is dark energy actually zero-point energy?
- jimjohnson
- · Replies 4 ·
Graduate Testing Relativity: Spinning in Space - Feasible?
- jreelawg
- · Replies 6 ·
High School Does the earth translate around the sun?
- nonequilibrium
- · Replies 7 ·
Graduate Why Do Disk Galaxies Appear to Spin Despite Irregular Redshift Patterns?
- TrickyDicky
- · Replies 8 ·
Undergrad What Are the Competing Theories in Astrophysics: Dark Matter vs MOND?
- Ironside
- · Replies 1 ·
Graduate Galaxy at redshift z=8.6 (the actual paper)
- marcus
- · Replies 1 ·
Graduate How Is the Distance to the CMB Measured and How Does It Relate to Its Structure?
- AutoToAlek
- · Replies 2 ·
Graduate Does the universe need an escape velocity?
- jhe1984
- · Replies 12 ·
Graduate How Do Critical Density and CMB Irregularities Explain the Universe's Shape?
- leatherneckpa
- · Replies 2 ·
CERN scientists eye parallel universe breakthrough
- Gaius Baltar
- · Replies 2 ·
Stargazing Increasing the resolving power of a telescope
- Idoubt
- · Replies 1 ·
High School Could Gliese 581 Be Our Next Habitable Planet?
- AfRoMaNn
- · Replies 2 ·
Undergrad How is measuring Redshift possible?
- timbreman
- · Replies 8 ·
High School Ideas for High School Astrophysics Course Syllabus
- kungfuscious
- · Replies 8 ·
Undergrad New to astrophysics, don't have a good physics foundation, need some help
- Aurealis
- · Replies 7 ·
Graduate What are the limits of interstellar travel?
- skippy1729
- · Replies 44 ·
Undergrad *Quick moon question - (about orbit)
- nukeman
- · Replies 6 ·
Undergrad Formation of Stars: How Gas Spins to Fuel Birth
- Sniperman724
- · Replies 2 ·
Undergrad Is this angular size calculation correct?
- nukeman
- · Replies 1 ·
Undergrad Universe Origin: How Could Galaxy be 13B Light Years Away?
- Trimike
- · Replies 1 ·
Graduate How Does Gravity Work and What Causes Time to Slow Down Near a Black Hole?
- temoisio
- · Replies 10 ·
Graduate Superstring Cosmology: Compactifying 7 Dimensions
- Kevin_Axion
- · Replies 5 ·
Undergrad How do I normalize the likelihood distribution?
- aymer
- · Replies 8 ·
Undergrad Is the Big Bang Theory Debunked?
- phoenixthoth
- · Replies 55 ·
Stargazing Pictures I took at a 2.5m telescope in the Canary Islands
- kungfuscious
- · Replies 1 ·
Undergrad Are Wormholes the Key to Unlocking the Universe's Secrets?
- 2rashmi1993
- · Replies 6 ·
Graduate Could Dark Energy be Caused by a Slow Shift in the Base State?
- Upisoft
- · Replies 3 ·
Undergrad Calculating the Earth-Sun distance during perihelion
- nukeman
- · Replies 9 ·
Graduate Inflation and initial conditions
- skydivephil
- · Replies 2 ·
Graduate The Collision of Elliptical Galaxies: A Surprising and Promising Event
- TrickyDicky
- · Replies 2 ·
Stargazing What is the Best Catadioptric Telescope for Portability and Versatility?
- procq
- · Replies 4 ·
Undergrad Greenwich Mean Timt, GMT and Universal Coodinated Time, UT
- Philosophaie
- · Replies 2 ·
Question about having a Theory in astronomy. ?
- nukeman
- · Replies 16 ·
Undergrad Question about Objects in Ultra Deep Field
- AdkinsJr
- · Replies 3 ·
Stargazing Heyy, i've had a telescope before and know how to use them.Has
- nickthrop101
- · Replies 3 ·
High School Is Earth’s orbit far from circular?
- nukeman
- · Replies 1 ·
Stargazing What Are the Best Telescope Models Within the £100-£250 Range?
- nickthrop101
- · Replies 1 ·
Graduate Faster than Light Travel Side Effects
- Ultrastar 1
- · Replies 17 ·
Undergrad Black holes giving birth to stars?
- discord73
- · Replies 1 ·
Graduate How Do Stars Achieve Their Massive Sizes?
- discord73
- · Replies 1 ·
Graduate What are the Current Main Research Topics in Astrophysics?
- ahmadfadl92
- · Replies 1 ·
High School Question about Phases of the Moon. Thanks
- nukeman
- · Replies 13 ·
High School Is the Waning Crescent Visible Near the Horizon?
- nukeman
- · Replies 4 ·
High School What would happen if you fell into a black hole?
- wangdang
- · Replies 5 ·
Undergrad Tides & Moon Distance: Seeking Answers
- kay89
- · Replies 11 ·
Stargazing Aug 21st, 2017, a total solar eclipse will cross the US
- Ivan Seeking
- · Replies 29 ·
Graduate Dark matter and keplerian revolution
- TrickyDicky
- · Replies 19 ·
High School The Grand Design - Stephen Hawking and Leonard Mlodinow
- yarixen
- · Replies 5 ·
Graduate What Causes Hypervelocity Stars to Eject from Black Holes?
- shnazzybox
- · Replies 1 ·
Graduate Calculating Motion in a Three-Body Gravity System: Challenges and Solutions
- Sakriya
- · Replies 12 ·
Undergrad Calculating Gravities for Math to the Moon
- nution
- · Replies 2 ·
Undergrad From physics how can we figure out how old the earth and the universe is?
- dcderek24
- · Replies 7 ·
Graduate Can a "Dead Universe" be Revived?
- geordief
- · Replies 8 ·
Undergrad Astrometry and Elliptical orbits
- Mu naught
- · Replies 4 ·
Graduate How is the Final Velocity of Star Movements Calculated?
- lenfromkits
- · Replies 1 ·
Undergrad Can We Reach the Moon with a Slow, Steady Launch?
- nution
- · Replies 9 ·
Undergrad How Can We Determine the Size of a Black Hole?
- fillipeano
- · Replies 4 ·
Undergrad Could Heat Exchange Be the Reason Behind Earth's Spin?
- JamiePocock
- · Replies 3 ·
Undergrad Strange wikipedia entry about the sun's core
- Fanaval
- · Replies 3 ·
Graduate The infinite possobilities presented by the infinite amount of probabilities
- dr.probable
- · Replies 14 ·
High School Why are solar eclipses so short compared to lunar eclipses?
- nukeman
- · Replies 3 ·
Graduate Negative pressure and dark energy
- relativityfan
- · Replies 10 ·
Graduate Why smaller particles come together
- A Dhingra
- · Replies 6 ·
Graduate Colliding Black Holes: Will the Smaller Get Pulled In?
- Worzel
- · Replies 4 ·
Undergrad Define/explain this gravity calculation (picture)
- nukeman
- · Replies 4 ·
John Huchra Dies at 61; Maps Altered Ideas on Universe
- diogenesNY
- · Replies 1 ·
Graduate Can FLRW metric be taken to describe stretching in time rather than space?
- themos
- · Replies 2 ·
Graduate Quasar Alignment to Cosmic Strings
- Kevin_Axion
- · Replies 5 ·
Graduate Expanding Present Time Universe at Omega 0 = 1: Help Needed
- knightq
- · Replies 8 ·
Graduate Can a QM/GR overlap provide a breakthrough in understanding gravity?
- Ran out of sp
- · Replies 3 ·
Undergrad Galaxies on the Edge: Understanding the Expansion of the Universe
- jimjohnson
- · Replies 5 ·
Graduate What caused the expansion of the universe for the 1st 7 billion years?
- mysearch
- · Replies 10 ·
Graduate What is the relationship between mathematical structures and real existence?
- PhanthomJay
- · Replies 8 ·
Graduate Is the Expansion of the Universe Driven by Mass?
- wolram
- · Replies 22 ·
Graduate What is the energy of the galactic magnetic field? (E/c^2)
- MTd2
- · Replies 1 ·
Graduate Plotting Intensity in Airy Pattern of Telescope - 1D
- theneedtoknow
- · Replies 1 ·
Graduate Cosmological Constant: Dark Energy vs Gravity Ratio
- Ikoro
- · Replies 18 ·
Graduate Are Distant Globular Clusters the Key to Testing Newtonian Gravity?
- inflector
- · Replies 19 ·
Graduate If Big Crunch = True, then Reincarnation = True?
- SeventhSigma
- · Replies 18 ·
Graduate Subatomic particle and space curvature
- richerrich
- · Replies 10 ·
Graduate Origin of Dark Energy: Before the Big Bang
- richerrich
- · Replies 7 ·
Graduate How many methods for dating a galaxy
- lenfromkits
- · Replies 1 ·
Graduate Was the Universe Really Chaotic Right After the Big Bang?
- Descartz2000
- · Replies 15 ·
High School Super black holes and stars orbiting them
- littlebanger
- · Replies 16 ·
Graduate Super-black holes and the universe
- gta-maloy]
- · Replies 11 ·
Graduate Explore the Possibility of Other Universes with Hawking's "The Grand Design
- PhanthomJay
- · Replies 11 ·
Undergrad Was the Moon Ever Touching Earth Billions of Years Ago?
- dcderek24
- · Replies 10 ·
Graduate State of matter before a black hole is formed.
- conan
- · Replies 16 ·
Graduate Pressure in stars from photons vs. electron/positron pairs
- PAllen
- · Replies 5 ·
Undergrad Degeneracy pressure and interactions
- relativityfan
- · Replies 7 ·
High School What Are Some Math-Based Topics for an Astrophysics Project?
- Fragment
- · Replies 1 ·
Graduate Dark Energy, Light, the Universe, and Black Holes
- bredmond812
- · Replies 4 ·
Undergrad Angular size of Venus: Is my math correct?
- nukeman
- · Replies 9 ·
Graduate Some questions about energy conservation
- Upisoft
- · Replies 2 ·
High School *Quick question: When is VENUS visable in the sky in this period ?
- nukeman
- · Replies 14 ·
Graduate Why Doesn't Light from the Big Bang Get Stretched Out?
- leonstavros
- · Replies 10 ·
Undergrad Coordinates of Planets: An Astronomer's Guide
- t_n_p
- · Replies 6 ·
Graduate Will the Planck Satellite Illuminate Loop Quantum Cosmology Insights?
- skydivephil
- · Replies 7 ·
High School Tele Vue / Meade laser test: question
- cyber3d
- · Replies 5 ·
Undergrad Using Sloan Digital Sky Survey to find Planets
- daveed
- · Replies 2 ·