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 Can a satellite remain stationary over Earth's poles?
- Grimstone
- · Replies 11 ·
Undergrad How many kinds of force exist between Planets?
- oem7110
- · Replies 17 ·
Undergrad Absolute Magnitude Calculation, How?
- capcom
- · Replies 2 ·
Graduate The End of the Universe: A Black Hole Solution?
- Abidal Sala
- · Replies 54 ·
Graduate Measurement of c using Bradley and 1905 SRT aberration models
- Ken More
- · Replies 14 ·
Undergrad Does the observable universe lie within the unobservable universe?
- Lensman
- · Replies 18 ·
Graduate Gauss's Law and Magnetic Reconnection
- Aurora Austra
- · Replies 4 ·
Graduate Phase-space structures in plasma turbulence
- maxime.lesur
- · Replies 2 ·
Graduate Could a neutron star fragment survive entering Earth's atmosphere?
- waterfall
- · Replies 14 ·
Graduate Can a Gravity Lens Loop Amplify Distant Objects in Space?
- Pronoein
- · Replies 3 ·
Graduate Why the universe appears to have one time and three space dimensions
- Micheal McG
- · Replies 5 ·
Graduate Universe as a cellular automaton
- Terrr
- · Replies 4 ·
Undergrad How Do You Measure Gas Leaks in Space?
- Billionaires
- · Replies 4 ·
Graduate Rest frames in the early universe?
- Karl Coryat
- · Replies 3 ·
Real pictures of black hole eating a star?
- fellupahill
- · Replies 20 ·
Graduate Do massless particles always travel at the speed of light?
- Karl Coryat
- · Replies 7 ·
Graduate Does Dark Flow Challenge the Big Bang Theory?
- fellupahill
- · Replies 15 ·
Is the Flash Scale of the Universe Animation Still Relevant?
- Greg Bernhardt
- · Replies 2 ·
Graduate Dark Energy: Questions on Uniform Energy Density
- MackBowen
- · Replies 2 ·
Undergrad Can anyone provide valuable information on dark flow for my astronomy paper?
- redrum419_7
- · Replies 2 ·
Undergrad Why the sun didn't absorb heavy elements from early solar system?
- arman4
- · Replies 7 ·
Graduate Why do planets at different distances see different redshifts from the same star?
- ch@rlatan
- · Replies 26 ·
Scale of the Universe: Zoom-In, Zoom-Out Animation for Kids
- Constantinos
- · Replies 1 ·
From the Planck length to the Observable Universe
- Bobbywhy
- · Replies 1 ·
Graduate Uniformity of Distance - Is It Possible to Prove?
- DarkFalz
- · Replies 21 ·
Graduate All matter being liquid in 10^65 years if proton decay doesn't occur.
- Dremmer
- · Replies 9 ·
Graduate Frame-Dragging, Density and Space-time Distortion
- Theoretically
- · Replies 3 ·
Undergrad Is Iron Truly the Heaviest Element Formed in Stars?
- manenbu
- · Replies 4 ·
Undergrad When a star loses its mass, do the orbital radii of the planets increase?
- kd001
- · Replies 13 ·
Graduate Does Galactic Rotation Cause Frame Dragging?
- H2Bro
- · Replies 2 ·
High School Way Way Bigger than Canis Majoris?
- SYahoo
- · Replies 6 ·
Graduate How is universe curvature measured?
- minio
- · Replies 11 ·
Undergrad Acceleration of spaceships with different masses?
- GTOM
- · Replies 20 ·
Graduate Does the expansion cutoff in equations prevent distant universe parts from affecting us?
- jensel
- · Replies 12 ·
Graduate Can colliding branes explain the Big Bang evidence?
- stglyde
- · Replies 100 ·
Undergrad Blackholes and expanding universe
- veejay
- · Replies 21 ·
Undergrad What is the Semi Major Axis of a Binary Star System?
- goldsax
- · Replies 5 ·
Undergrad Precession-Jumping from 1875 to 1950
- solarblast
- · Replies 1 ·
Undergrad How do ISS occupants survive exposure to coronal mass ejections?
- RJ Emery
- · Replies 2 ·
Undergrad Gyroscopic effect on planetary motion
- R Power
- · Replies 3 ·
Graduate Is Faster Than Light Travel Possible Through Controlled Space Expansion?
- knicely
- · Replies 15 ·
Undergrad How massive/hot does a star have to be for fusion to occur
- ugalpha
- · Replies 6 ·
Graduate What happened before the BIG BANG, Roger Penrose's Theory
- aznasdf
- · Replies 17 ·
Undergrad Motions of stars inside elliptical galaxies?
- dougettinger
- · Replies 18 ·
Undergrad Earth at the center of the Universe
- ugalpha
- · Replies 14 ·
Graduate Is Paul Steinhardt's Statement "Rather Pathetic"? Why?
- marcus
- · Replies 114 ·
Graduate Top Biosignatures for exo planet spectra
- skydivephil
- · Replies 15 ·
Graduate Might NGC 1073 have a non-coplanar bar and spiral arms?
- Paulibus
- · Replies 10 ·
Undergrad Search patterns in observational studies
- stargazer3
- · Replies 3 ·
High School Why does the Moon control Earth's tides if the Sun's gravity is stronger?
- Natko
- · Replies 26 ·
Graduate Is the Acceleration of the Universe Expansion accelerating?
- Swimmingly!
- · Replies 2 ·
Graduate Space, matter and physical models
- bagheraa
- · Replies 5 ·
Undergrad Video Games and Their Basis in Theory
- cjackson
- · Replies 7 ·
Graduate Could the universe be infinite beyond what we can observe?
- Irishwake
- · Replies 16 ·
High School Why don't shooting stars make a noise?
- shifty88
- · Replies 12 ·
Undergrad The Sun with a planet with a moon with a satellite
- Loren Booda
- · Replies 6 ·
High School What is a Geomagnetic Storm and How Does it Affect Earth?
- timacho
- · Replies 4 ·
Graduate Why does the space-time curvature analogy show orbits in all directions?
- sirnamemr
- · Replies 9 ·
Graduate Heat death, quantum uncertainty and Feynman's Path Integral
- Zedhex
- · Replies 14 ·
Graduate Which theory accurately explains the effect of gravity on light?
- thetexan
- · Replies 5 ·
Graduate Detecting hydrogen inside IMC's and GMC's
- dougettinger
- · Replies 3 ·
Graduate Are Void Centers Ultra-Massive Primordial Black Holes?
- David Paul
- · Replies 16 ·
Graduate What is the nature of space and time?
- Dremmer
- · Replies 2 ·
Stargazing Does telescope resolution depend on contiguous mirror area?
- Drakkith
- · Replies 15 ·
Graduate What Steps Are Missing in Deriving Pogson's Law?
- 71GA
- · Replies 1 ·
Graduate What Distinguishes the t=0 Singularity from a Black Hole Singularity?
- ugalpha
- · Replies 5 ·
High School When did black holes first started to appear in the universe?
- phy_freak
- · Replies 7 ·
Graduate Is Dark Matter the Result of the Big Bang?
- phy_freak
- · Replies 2 ·
Undergrad What acceleration of universe means?
- minio
- · Replies 18 ·
Graduate Star whose pressure support is degenerate electrons.
- the ads 13
- · Replies 3 ·
High School Is the Solar Snake or helical helix theory of planetary motion valid?
- esj001
- · Replies 6 ·
Graduate How inflation can give rise to irregularities
- houhou.trad
- · Replies 5 ·
Undergrad When will 1000 humans have left Earth's surface?
- Algren
- · Replies 19 ·
Graduate The quantum based calculation of the cosmological constant
- salvestrom
- · Replies 13 ·
Undergrad At what volumetric flow rate will air fill a space vacuum at Earth's STP?
- rcoopster
- · Replies 19 ·
Graduate The diffence between expanding universe and light slowing?
- Edward Solomo
- · Replies 6 ·
Origin of the precession matrix shown
- solarblast
- · Replies 3 ·
Undergrad Computing the period of a meteor using two ways.
- solarblast
- · Replies 8 ·
Undergrad Redshift as evidence of expansion
- dpa
- · Replies 56 ·
Graduate Effects of Solar Flares on the Moon and Equiptment used for lunar exploration
- MonserrateM
- · Replies 1 ·
Undergrad How do Cracovian matrices work?
- solarblast
- · Replies 2 ·
Graduate How can a 1-dimensional being prove they live on a circle?
- ugalpha
- · Replies 35 ·
Graduate The history of orbital element methods
- solarblast
- · Replies 1 ·
Undergrad Finding the position of an object 1800 years ago?
- solarblast
- · Replies 1 ·
Undergrad Why Is the JUICE Mission Targeting Ganymede Instead of Europa?
- skydivephil
- · Replies 3 ·
Undergrad Probability that planets have perfectly circular orbits
- Algren
- · Replies 8 ·
Graduate Is the Universe Expanding Into 4th Dimension?
- Snip3r
- · Replies 17 ·
High School Will we always be in observation mode?
- Vyom
- · Replies 7 ·
Graduate Girl Reaches 99.9% of Train's Speed Despite Time Slowing Down
- Grimstone
- · Replies 5 ·
Graduate Calculating kinetic energy of all matter
- jimjohnson
- · Replies 8 ·
Graduate Is the Universe Losing Energy and Heading Towards an Unfortunate End?
- Algren
- · Replies 42 ·
Graduate Could the solar system have formed directly on the site of a supernova?
- ericwdhs
- · Replies 5 ·
Graduate How can galxies and dwarf galaxies be made of regular AND dark matter?
- fellupahill
- · Replies 4 ·
Undergrad Equations for orbital velocity and ellipse axes
- smize
- · Replies 16 ·
Graduate Cosmological constant supports MOND
- jimjohnson
- · Replies 19 ·
Graduate What would be some creative ways to make a black hole?
- Antientrophy
- · Replies 12 ·
Graduate Are the Laws of the Universe Influenced by the Structure of Our Brains?
- Ossama
- · Replies 1 ·
Graduate Did Time Begin with the Big Bang?
- Khursed
- · Replies 43 ·
Undergrad The Milky Way from the Andromeda Galaxy: Edge-on, Spiral, or In-Between?
- Fozzie
- · Replies 3 ·
Undergrad Kepler Exoplanet findings and galactic plane question
- Ed Zachary
- · Replies 2 ·