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 there a subtle symmetry that may not apply in an infinite universe?
- Quarlep
- · Replies 7 ·
Graduate Help with the Weber-Davis solar wind model
- JvD
- · Replies 2 ·
Purchasing binoculars for stargazing advice
- cristo
- · Replies 16 ·
Graduate Why must singularities create an entire universe?
- Cadillac Jack
- · Replies 8 ·
High School Confusion regarding Solar Eclipse
- Sanket Jayn
- · Replies 1 ·
Graduate 41430 Arietis Quadruple Star System
- |Glitch|
- · Replies 2 ·
Graduate Why decaying false-vacuum necessary for inflation?
- Lapidus
- · Replies 7 ·
Undergrad Gravitational lensing creates multiple images of the same supernova
- CaptDude
- · Replies 2 ·
Graduate Would dark matter appear dark or invisible to the naked eye?
- Delta2
- · Replies 16 ·
Graduate Calculating Orbital Pathways with Ellipses and Rosettes
- mreuterskiold3
- · Replies 2 ·
Graduate Are all universes the same age in the Multiverse?
- Canada Bob
- · Replies 4 ·
Graduate Cosmological principles and their results
- Quarlep
- · Replies 3 ·
Jupiter's Moons - A Night of Stargazing from Romania
- scotian280
- · Replies 10 ·
Graduate Is the Universe Flat or Closed According to WMAP Data?
- palmer eldtrich
- · Replies 7 ·
Graduate Is C = π x D Possible in a Universe of Nothing?
- richard9678
- · Replies 5 ·
Graduate A noobie questioning the nature of space
- ax0
- · Replies 22 ·
Graduate Closest mass to the line of sight
- center o bass
- · Replies 2 ·
Graduate Is the Boltzmann Brains Problem a Challenge for Eternal Inflation Cosmology?
- palmer eldtrich
- · Replies 6 ·
Graduate Can Black Holes Be Utilized for Practical Purposes?
- Dipto
- · Replies 9 ·
Graduate Acceleration a Function of Density, yet Density is Constant?
- HeavyMetal
- · Replies 16 ·
Graduate How would one protect the Universe?
- WiseGreatTrixie
- · Replies 3 ·
Graduate What Happens Inside a Black Hole?
- The Fishicist
- · Replies 7 ·
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 Should we broadcast our location to potential extraterrestrial civilizations?
- 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 Do gravitational waves redshift with the expansion of the universe?
- TEFLing
- · Replies 14 ·
Graduate Orion Nebula's Origin Uncovered?
- CygnusX-1
- · Replies 1 ·
Graduate Tracking down Phil Trans xxxv 637
- tpv
- · Replies 2 ·
Graduate Why do density perturbations relate to the Hubble radius c/H?
- 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 ·
Barn door tracker stability issues
- scott mcleod jr
- · Replies 19 ·
High School Nova's 'The Big Bang Machine' episode oversimplifies the Big Bang
- 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 Are dark matter black holes possible?
- James S
- · Replies 19 ·
Graduate Is Universal Expansion Perceptible to Observers?
- vinven7
- · Replies 5 ·
Undergrad Would a tilted solar panel match summer energy output in winter?
- 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 How to analyze Planck 2015 data for inflation models
- 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 Why would a neutron star collapse beyond its Schwarzschild radius?
- 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 Did the Big Bang expand from a single point or everywhere at once?
- 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 Why do distant galaxies appear to move faster if we're seeing them in the past?
- Igottaknow
- · Replies 43 ·
Stargazing Research with Ritchey–Chrétien 400 mm telescope
- Xsnac
- · Replies 3 ·
Graduate Could mass loss from fusion explain cosmic acceleration?
- binderberger
- · Replies 21 ·
Graduate How did Hawking derive black hole entropy and connect it to 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 ·
Can a USB eyepiece camera match a regular eyepiece for viewing with a reflector telescope?
- DaveC426913
- · Replies 6 ·
Graduate Constraints on Inflation (Planck 2015 results XX)
- marcus
- · Replies 8 ·