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 Is There a Preferred Plane for Satellite Orbits?
- DecayProduct
- · Replies 1 ·
Undergrad Universe Energy: Where Does It Come From?
- octelcogopod
- · Replies 4 ·
Graduate Mean Intensity Magnitude of Variable Star
- emtilt
- · Replies 2 ·
How, in GOD'S NAME, does one pronounce Wolf-Rayet
- Astrofiend
- · Replies 5 ·
Graduate Finite universe and inflation theory
- honzik
- · Replies 29 ·
Graduate What is the initial force of universe expansion?
- Ranku
- · Replies 1 ·
Graduate Universe expanding faster than light
- camilus
- · Replies 58 ·
Graduate Quasars & Antimatter: Evidence of Abundance?
- thebaron
- · Replies 4 ·
Undergrad Why is space so afraid of matter?
- Tommahawk
- · Replies 1 ·
Undergrad How can the small angle formula be used to measure the physical size of a star?
- Fisicks
- · Replies 3 ·
High School Can Planets Be Juggled Between Binary Stars?
- Quantum_Grid
- · Replies 2 ·
Graduate Understanding the Three Body Problem in Space
- JANm
- · Replies 4 ·
Graduate Scaling Cosmologies: Solving the Coincidence Problem
- wolram
- · Replies 4 ·
Military Covering up Fireballs from Space
- benk99nenm312
- · Replies 8 ·
Undergrad How would a man on earth appear from outer space
- vijay_singh
- · Replies 4 ·
Undergrad Interstellar Gas & Dust, Densities & Temperatures
- treddie
- · Replies 6 ·
Stargazing Is a .1MHz RF Choke Necessary for the Itty Bitty Radio Telescope?
- redguy12
- · Replies 5 ·
High School Why is there no atmosphere on moon
- jontyjashan
- · Replies 6 ·
Graduate Is Betelgeuse Already a Supernova?
- mgb_phys
- · Replies 3 ·
Graduate Question About Derivative Notation
- cepheid
- · Replies 2 ·
Is the Alternate Big Bang Theory Supported by Scientific Evidence?
- Ultrastar 1
- · Replies 4 ·
Graduate Link White hole and our Universe
- TheRK
- · Replies 3 ·
Graduate Gravitational Lensing: Accretion Discs Around Black Holes
- charlespune
- · Replies 4 ·
Undergrad A beginner's question re: size of universe
- redwards
- · Replies 6 ·
Graduate Raisin pudding or balloon at LHC
- Pjpic
- · Replies 1 ·
Graduate Wolfgang Rindler: Godel's Remarkable Excursion into Cosmology
- George Jones
- · Replies 1 ·
Graduate Inflation: Why all the 10^27s everywhere?
- Xezlec
- · Replies 8 ·
Graduate Can We Really Observe White Holes, or Do They Only Exist Mathematically?
- Kit
- · Replies 14 ·
Graduate Measuring Black Hole Gravity with a Laser
- deathstar
- · Replies 1 ·
Graduate Massive M87 Black Hole Discovered with Supercomputer
- Astronuc
- · Replies 3 ·
Undergrad Can Someone Help Me Rearrange This Astrophysics Equation?
- log(3.14)
- · Replies 6 ·
Naming Stars: A Scam or Legitimate Organization?
- frankinstein
- · Replies 15 ·
Graduate Does time dilation cause redshift?
- d0wnl0w
- · Replies 2 ·
Graduate Fundamental parameter probabilities
- Pjpic
- · Replies 4 ·
Graduate Inflationary Models: A Dead End?
- Naty1
- · Replies 7 ·
The universe 700 trillion light years away.
- SpaceGuy50
- · Replies 7 ·
High School What is the gravitational acceleration on Earth's surface?
- markalloyd1
- · Replies 2 ·
High School Liquid ocean in Uranus and Neptune
- SpaceGuy50
- · Replies 8 ·
Graduate Matter and Antimatter: Why Did Matter Dominate?
- joychandra
- · Replies 6 ·
Undergrad Is there any formula to calculate the effect gravity has on time
- d0wnl0w
- · Replies 2 ·
Graduate Is the Hubble Age Estimate Really Accurate?
- yogi
- · Replies 11 ·
Graduate How Do Black Holes Emit Radio Waves if They Only Suck Things In?
- Siadeug
- · Replies 12 ·
Undergrad Solar Wind's Effect on other Planets
- Philosophaie
- · Replies 2 ·
Graduate Scale of inflation and dark energy
- zeebo17
- · Replies 1 ·
Graduate Alternate universe attractive/repeling force?
- cabledog
- · Replies 8 ·
Can Penguin Poop Really Be Seen from Space?
- Math Is Hard
- · Replies 11 ·
Has anyone not seen Google sky? What did you think?
- Spinnor
- · Replies 1 ·
High School Can we see our own galaxy out there due to gravitational effects?
- NWH
- · Replies 5 ·
How can I tell if the night sky is observable from here?
- TidusBlade
- · Replies 4 ·
Undergrad What Do You Need to Know About Star Clustering Research?
- heavenscloud
- · Replies 1 ·
Graduate What Are the Implications of Ignoring Pre-Big Bang Events?
- gabrielh
- · Replies 4 ·
Graduate Understanding Superluminal Jets and Accretion Emissions from Black Holes
- protonchain
- · Replies 2 ·
High School Comet Tails: A Mystery of Solar Forces
- ManDay
- · Replies 7 ·
High School Gaining Understanding of Force for Launching a Rocket/Satellite into Space
- WarrickF
- · Replies 20 ·
Graduate Does the Expansion of the Universe Defy the Law of Conservation of Energy?
- flawless86
- · Replies 2 ·
Graduate Evidence for dark energy equation of state paramater w = -1
- Mosis
- · Replies 2 ·
Graduate Size of the *observable* universe (noob questions about)
- marcus
- · Replies 8 ·
Undergrad Galaxies receeding at and above speed of light
- chicopee
- · Replies 15 ·
High School Is a KBO the Size of Mars Considered a Planet?
- SpaceGuy50
- · Replies 1 ·
Graduate What Makes Supernova 2008ha Unique and How Did a 14-Year-Old Discover It?
- Astronuc
- · Replies 5 ·
Undergrad How long until the Sun becomes a black dwarf?
- SpaceGuy50
- · Replies 1 ·
High School Gravity & Satellites: Moon's Influence on Earth Satellites
- thomasxc
- · Replies 2 ·
Graduate Derivation of (linearized) perturbation equations
- Angelos K
- · Replies 2 ·
Undergrad Exoplanets seem all to have elliptical orbits
- cosmicpencil
- · Replies 3 ·
Math is Hard - the Aerospace Engineer
- DaveC426913
- · Replies 12 ·
Graduate Comparing data sets of different size
- cepheid
- · Replies 4 ·
Challenging Claims of Proof for Evolution: The Scientific Perspective
- prysdieheer
- · Replies 2 ·
Graduate What happens to a light beam in a flat universe with finite size?
- benk99nenm312
- · Replies 13 ·
Graduate Proof of the curvature of space-time?
- Roo
- · Replies 6 ·
Graduate Derive flight path angle from orbital elements
- h4tt3n
- · Replies 1 ·
Graduate Detecting Anti-Matter: Can We Tell?
- kumar1988
- · Replies 22 ·
Graduate Accounting for Cosmological Expansion in Distance Measurements
- Brantoc
- · Replies 1 ·
Episode of The Universe (WMAP)
- benk99nenm312
- · Replies 17 ·
Undergrad Solar Coraona, Photosphere, and temperture
- Starwatcher16
- · Replies 1 ·
Undergrad How Did Planets Enter Their Orbits?
- ajassat
- · Replies 3 ·
Graduate What is time and how does it affect our perception of space and light?
- Anuraj Pillay
- · Replies 1 ·
Undergrad Size Limit of Comets: Understanding Kepler's Laws
- raknath
- · Replies 12 ·
Graduate Thick-Skinned Gravastars Vie to Replace Black Holes, in Theory
- brum
- · Replies 3 ·
Graduate What stops a star from fusing all its fuel at once?
- only_theory
- · Replies 16 ·
Graduate Does Acceleration Affect a Distant Observer's Perception?
- Sheneron
- · Replies 12 ·
Graduate Does Flat Space Exist in the Context of General Relativity?
- yuanwei
- · Replies 4 ·
Graduate I don't like Dark Matter and Dark Energy
- Illuminaughty
- · Replies 35 ·
Graduate Calculating Celestial Coordinates
- science.girl
- · Replies 5 ·
Undergrad Distance to stars from my house using the parallax technique?
- Stratosphere
- · Replies 5 ·
Graduate Can You Determine the Center of Mass Distance Using Instantaneous Orbital Data?
- DiamondGeezer
- · Replies 95 ·
High School Do Planets Orbit Closer to the Sun Over Time?
- mikejr82
- · Replies 1 ·
Graduate How is the Proton to Neutron Ratio Calculated After the Big Bang?
- electerr
- · Replies 6 ·
Graduate Can Black Holes Bend Light and Act as a Time Machine?
- PhantomOeo
- · Replies 14 ·
Graduate Slowing time or expanding space?
- skypunter
- · Replies 1 ·
Graduate Evaluating distance of far objects in space
- philhar
- · Replies 3 ·
Undergrad The origins of universe and development
- Dex
- · Replies 2 ·
Undergrad What Gases Are Present in Dwarf Planets and Kuiper Belt Objects?
- mikejr82
- · Replies 7 ·
High School Distance analogy - am I being accurate?
- leogarcia61
- · Replies 4 ·
Graduate Can Non-Cosmological Redshifts Explain Anomalies in Galaxy Interactions?
- turbo
- · Replies 71 ·
Graduate Seeing Back to the Big Bang: Is it Possible?
- ChrisXenon
- · Replies 3 ·
High School Size of the Universe is 13.7 billion light years?
- Beaudoin
- · Replies 14 ·
Graduate A question about Friedmann Equations
- $id
- · Replies 2 ·
Graduate Do the cosmological expansion affect binding systems
- dimilion
- · Replies 2 ·
Graduate Misconceptions about expanding space
- nutgeb
- · Replies 12 ·
High School Zodiac Constellations: Sun's Path Through the Year
- Cyrus80772
- · Replies 20 ·