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 the Universe Deterministic or Not?
- Quantum_Bruno
- · Replies 46 ·
Graduate Why "Dark Energy density" instead of CC?
- wabbit
- · Replies 24 ·
Graduate Calculating relative velocity of Crab Nebula
- LavaLynne
- · Replies 2 ·
Graduate How would we measure time and location in space?
- adimantium
- · Replies 5 ·
Graduate Is the Universe Still Expanding Faster Than the Speed of Light?
- Suraj M
- · Replies 19 ·
Graduate What is the Universe expanding into?
- johnveets
- · Replies 6 ·
Undergrad Sending information in space: an invitation to catastrophe?
- PWiz
- · Replies 16 ·
High School Help Solving Equation: Notation Explained
- Derpotron
- · Replies 3 ·
Undergrad Horizontal Branch Star: A Planet-like Object Found on ALADIN
- liometopum
- · Replies 3 ·
Undergrad Earth and moon barycenter question.
- Mr. Krang
- · Replies 8 ·
Graduate What is the key equation for distance growth in Kindercosmos?
- marcus
- · Replies 12 ·
Graduate Gravitational Effect of Electromagnetic Radiation
- Jon Mel
- · Replies 4 ·
High School T: What Stars Are We Seeing Between Galaxies?
- thetexan
- · Replies 3 ·
Graduate Is the "Big Bang Theory" is on it's last breath?
- RandyD123
- · Replies 3 ·
Graduate Globular cluster ejected from M87
- liometopum
- · Replies 3 ·
Graduate Distribution of energy after matter/antimatter annihilation
- ft_c
- · Replies 5 ·
Undergrad Can Magnets Bend Space-Time and Enable Time Travel?
- Dipto
- · Replies 8 ·
Graduate Shape of Universe - What would a very long stick do
- CMaso
- · Replies 52 ·
Graduate Calibration cosmic distance scale on age globular clusters
- pstq
- · Replies 1 ·
Graduate Gravitational Waves and the Expansion of the Universe: Redshift or Not?
- TEFLing
- · Replies 14 ·
Graduate Orion Nebula's Origin Uncovered?
- CygnusX-1
- · Replies 1 ·
Graduate Tracking down Phil Trans xxxv 637
- tpv
- · Replies 2 ·
Graduate Density Perturbations: Relation to c/H & Scale Invariance
- Discman
- · Replies 1 ·
Undergrad Are Martian rock formations similar to those on Earth?
- bitznbitez
- · Replies 7 ·
Undergrad What is the mass of Jupiter's white oval storms compared to Earth?
- Iustitia
- · Replies 1 ·
Build a Barn Door Tracker: Tips & Advice
- scott mcleod jr
- · Replies 19 ·
High School C: "The Big Bang Machine" on Nova: A Critique
- diogenesNY
- · Replies 7 ·
Graduate Quantum equations suggest the big bang never happened
- iDimension
- · Replies 86 ·
Graduate Predicting orbits and masses of as-yet-unknown bodies
- gulfcoastfella
- · Replies 5 ·
Undergrad Terminology in structure generating
- Discman
- · Replies 25 ·
Graduate Kepler's 3rd Law: Constant Orbital Velocity Around Black Holes?
- Suraj M
- · Replies 5 ·
Graduate Variance and 2 point function in perturbation theory
- karlzr
- · Replies 4 ·
Undergrad Is Cosmology a Branch of Physics or Astronomy?
- Amrator
- · Replies 6 ·
Graduate What are the important numbers in Cosmology?
- ecastro
- · Replies 27 ·
Graduate Does Gravitational Lensing Cause Red Shift in Light?
- Tanelorn
- · Replies 7 ·
Undergrad Virtual Solar System (formula for gravity in 3d)
- Mipada
- · Replies 1 ·
Undergrad Seasons due to Earth's elliptical orbit
- MisterAmrani
- · Replies 10 ·
Undergrad Dark Matter Black Holes: Is it Possible?
- James S
- · Replies 19 ·
Graduate Is Universal Expansion Perceptible to Observers?
- vinven7
- · Replies 5 ·
Undergrad Question about solar energy: angle of incidence
- itchybrain
- · Replies 19 ·
Graduate 3 fates of universe holds for which cosmological fluids?
- binbagsss
- · Replies 3 ·
Undergrad Precession of Earth's axis and alignment with stars
- Hornbein
- · Replies 5 ·
Graduate Why Is the Accelerated Friedmann Equation Giving Incorrect Signs?
- Cancer
- · Replies 7 ·
Graduate Quantity of matter in the universe?
- ericore
- · Replies 17 ·
High School ET Lives in a Multi-Planet Solar System
- CygnusX-1
- · Replies 4 ·
Graduate Possibility of multiple moons in Earth-Moon system
- Qshadow
- · Replies 9 ·
Graduate Interstellar gas cloud stability
- nburns
- · Replies 27 ·
Graduate Why did dark energy overcome dark matter to create the expanding Universe?
- EncryptedKnight
- · Replies 23 ·
Graduate Would the Big Rip make time stop?
- Lionel Doolan
- · Replies 2 ·
High School Imagine you were spinning in space
- Julian T Gr8
- · Replies 2 ·
Graduate Minimum Orbital Radius Around Black Holes
- GoBluePhysics
- · Replies 3 ·
Graduate How Did Early Black-Hole Dynamics Shape Galaxy Formation?
- dougfgd
- · Replies 22 ·
High School Does the amount of matter in the universe stay at a constant amount?
- Science2Dmax
- · Replies 19 ·
Graduate If there is a big crunch will space collapse with the matter?
- Peter 99
- · Replies 5 ·
Graduate Analyzing Planck Data for No-Scale Supergravity Inflation
- 302021895
- · Replies 5 ·
Undergrad How Do Supernovae Contribute to the Birth of New Stars?
- oksuz_
- · Replies 15 ·
Graduate Calculating time until apoapsis analytically
- Greg Bernhardt
- · Replies 3 ·
Graduate Using atomic clocks for gravitational wave detection
- Chronos
- · Replies 9 ·
Graduate Can Galaxy Lensing Confirm Dark Matter's Presence?
- Tanelorn
- · Replies 10 ·
Graduate Neutron Star Collapse: Upper Limit & Physics Explained
- zachry
- · Replies 2 ·
Graduate Scholz's star passed through the Oort cloud
- jim mcnamara
- · Replies 1 ·
Graduate In what way is "dark energy" more than "none of the above"?
- Diploria
- · Replies 16 ·
Graduate Simulating dark matter by assuming stable solution
- ohannuks
- · Replies 4 ·
Undergrad Unpacking the Big Bang: Understanding the Rapid Expansion of Space
- BilboBombadillo
- · Replies 9 ·
Unexpectly captured comet Comet C/2014 Q2 Lovejoy
- davenn
- · Replies 8 ·
Undergrad Relationship between characteristic energy and delta-v
- Gone
- · Replies 4 ·
Graduate Why do people think the universe is finite?
- alexrus1995
- · Replies 5 ·
Graduate Planckoscope- Visualizing Planck Data
- websterling
- · Replies 1 ·
High School Baffled by observation -- 3 lights in the night sky
- TehNetherlands
- · Replies 16 ·
Graduate Universe Expansion: Why Objects Move Away Faster The Farther We Look
- Igottaknow
- · Replies 43 ·
Stargazing Research with Ritchey–Chrétien 400 mm telescope
- Xsnac
- · Replies 3 ·
Graduate Dark Energy: Does Mass Loss Explain Acceleration?
- binderberger
- · Replies 21 ·
Graduate What Is the Connection Between Black Hole Entropy and the Holographic Principle?
- Edward Wij
- · Replies 5 ·
Graduate Questions Concerning The Planck Epoch
- Stan Stuchinski
- · Replies 15 ·
Graduate Type Ia Supernova not Standard Candles? I'm confused .
- Garth
- · Replies 16 ·
Graduate Expansion, Gravity and the Electric Force
- willoughby
- · Replies 4 ·
USB Eyepiece for Microscopes: Quality Viewing from Any Position
- DaveC426913
- · Replies 6 ·
Graduate Constraints on Inflation (Planck 2015 results XX)
- marcus
- · Replies 8 ·
Graduate Is Phi Squared Inflation Compatible with Latest Planck Data?
- slatts
- · Replies 5 ·
Graduate Has the Number of Galactic Revolutions Influenced Spiral Galaxy Formation?
- Pterosaur
- · Replies 5 ·
R.I.P. Dr. Val Fitch, 91. Nobel lauriate cosmologist
- diogenesNY
- · Replies 1 ·
High School Extra Solar Planets: Data & Answers
- mathman
- · Replies 2 ·
Graduate How are Solar Flares and Solar Winds Generated by the Sun's Magnetic Field?
- ubergewehr273
- · Replies 5 ·
Graduate Why did Dark Matter have less of an Impact on the Universe
- EncryptedKnight
- · Replies 1 ·
Undergrad Need data for galactic rotation curves
- Buckethead
- · Replies 1 ·
Graduate Klein Gordon Equation in Quintessence Models
- TimeFall
- · Replies 6 ·
Graduate Calculating the Temperature in Space
- |Glitch|
- · Replies 6 ·
High School Is there anything like a cosmic mirror?
- zthompson47
- · Replies 5 ·
Undergrad Speed of Galaxies: Defying Physics?
- Nova
- · Replies 12 ·
Stargazing Help with telescope/observatory data and images
- GiantSheeps
- · Replies 3 ·
Undergrad Astronomy: Measuring Radio Wave Distance from Universe
- psuedoben
- · Replies 10 ·
Undergrad "Amount" red light in red shifted light
- Aimhigh
- · Replies 8 ·
Graduate Does Hawking's Zero Energy Theory Resolve the Universe's Origin?
- Aleksa S.
- · Replies 6 ·
Undergrad If the energy or matter can't be created nor destroyed,does
- silvercats
- · Replies 2 ·
Graduate Wrong Explanations for the Luminosity of Main-Sequence Stars
- Ken G
- · Replies 72 ·
Graduate Boundary for an Infinite "Open" Space
- Feeble Wonk
- · Replies 8 ·
Graduate Hawking Says, There are no black holes.
- zoobyshoe
- · Replies 31 ·
Undergrad Is Space Really Empty and What Does That Mean for Propulsion?
- CaptTrey
- · Replies 35 ·
Graduate Is the Diffuse Microwave Energy from Galaxies Contributing to CMB Measurements?
- websterling
- · Replies 17 ·
Graduate Can Quantum Mechanics Explain the Expansion and Contraction of Space-Time?
- binbots
- · Replies 74 ·