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
Undergrad New Dark Matter Map Solving Galactic Puzzle?
- sachinism
- · Replies 1 ·
Graduate Universe only appears to be expanding.
- Grajek
- · Replies 11 ·
Undergrad How a binary system affects gravity on members?
- proteus13
- · Replies 12 ·
Undergrad Equation of an Elliptical Orbit for a Moon around a Planet
- farore
- · Replies 1 ·
Undergrad Could undiscovered Mars-sized objects exist in the Kuiper Belt?
- Dremmer
- · Replies 2 ·
Graduate Does light lose intensity traveling through a perfect vacuum?
- proteus13
- · Replies 9 ·
Consciousness and Reality: A Symbiotic Relationship
- prettycrimes
- · Replies 2 ·
Undergrad Could a Moon Make Gliese 581 g Habitable?
- sderamus
- · Replies 5 ·
Graduate The outcome of bending a blackhole to itself
- vilereaver41
- · Replies 1 ·
Graduate Relativistic mass and Hubble constant
- student1307
- · Replies 11 ·
Graduate Gravitational potential energy during core collapse from 0.01 to 20 km
- jess_vander
- · Replies 2 ·
Graduate Calculating Luminosity of a Star at Different Stages
- kelseymclean
- · Replies 5 ·
Graduate The Ultra-mega-macrostructure of the Universe
- daniel rey m.
- · Replies 2 ·
Graduate Where Can I Find Raw Data for Galactic Curve Velocities?
- lenfromkits
- · Replies 3 ·
Stargazing What does Mercury look like through naked eye, binoculars, telescope, and Hubble?
- nukeman
- · Replies 1 ·
Graduate Accelerating universe - details and dispute
- gth759k
- · Replies 4 ·
Graduate Two separate barycenters of a binary system in a small closed universe?
- Edward Solomo
- · Replies 2 ·
Graduate Simply connected vs. non-simply connected
- RModule
- · Replies 3 ·
Graduate Dark Matter as a Yukawa Like 5th force?
- MTd2
- · Replies 4 ·
Graduate Why does a black hole lose mass if it absorbs both particles from a pair?
- Khursed
- · Replies 15 ·
Graduate Can cosmological questions ultimately be answered or will fundamental ones remain?
- Tanelorn
- · Replies 3 ·
Undergrad Efficiency of solar panels: Earth vs Space
- pempem
- · Replies 3 ·
Graduate Some questions about glob. clusters and dark matter
- marcus
- · Replies 3 ·
High School Is There a Planetoid Bigger Than Pluto?
- Leumas71
- · Replies 6 ·
High School Why is everything in the Solar system on a flat plane?
- Smartoad
- · Replies 5 ·
New goldilocks planet and if there is water on it?
- mat1101
- · Replies 4 ·
Graduate What is the Egg Shell Theory of the Universe and its implications?
- Arac15
- · Replies 4 ·
Graduate Could Dark Mass Be a Possible Explanation for Missing Particles in the Universe?
- inflector
- · Replies 68 ·
Graduate Is there an infinite number of events in the past?
- kaleidoscope
- · Replies 2 ·
Graduate Living between the Galaxies (Dark Energy)
- Jetcru
- · Replies 12 ·
Graduate Why is the vacuum flat, i.e., Euclidean?
- nomadreid
- · Replies 17 ·
Graduate Do different inflated regions have different physical constants?
- RLutz
- · Replies 2 ·
Undergrad I and Tim float a long string of closely spaced helium-filled
- Pranav Jha
- · Replies 4 ·
Graduate Are We Correct? Calculating the Age of the Universe
- Hyperspace2
- · Replies 4 ·
Graduate Distribution and proportion of dark matter in galaxies
- Ranku
- · Replies 3 ·
Stargazing Which is better, a refracting or a reflecting telescope?
- Sniperman724
- · Replies 2 ·
Graduate Hubble's Law And A Question Of Time
- pjn2000
- · Replies 2 ·
Undergrad How do I calculate M_I from M_J values?
- omoplata
- · Replies 1 ·
Graduate What is the Shape of the Universe?
- JEMZ000
- · Replies 2 ·
Graduate Thought Experiement: The Earth's Fate with Added Mass
- Hyperspace2
- · Replies 2 ·
Comet Hartley 2 Flyby: Incredible Images from NASA's Deep Impact Probe
- Andre
- · Replies 4 ·
Undergrad Is the Lunar Laser Ranging Experiment a Good Topic for an Astrophysics Project?
- appy96
- · Replies 1 ·
Undergrad Fine-tuned Universe for life = God
- timhet
- · Replies 22 ·
Undergrad Eventual decay of all matter - question from an amateur
- Jota
- · Replies 6 ·
Undergrad Could this explain how evaporation of matter occurs in the universe?
- Peter (IMC)
- · Replies 33 ·
Graduate Are the universe and time abstract concepts?
- Time Machine
- · Replies 8 ·
Stargazing Looking for images of same object, but with different telescope sizes?
- nukeman
- · Replies 4 ·
Graduate Could dark energy shielding explain gravity and dark matter?
- Paul Howard A
- · Replies 2 ·
Graduate Does black hole temperature increase before matter actually falls in?
- Nabeshin
- · Replies 1 ·
Graduate Expanding Universe or Expanding Space?
- mysearch
- · Replies 21 ·
High School Why have so few dwarf planets been discovered since Eris?
- Algr
- · Replies 11 ·
Undergrad Speed of Moon without Sun gravity.
- SpeedofLight
- · Replies 30 ·
Graduate What Existed Before the Big Bang?
- sheetu
- · Replies 10 ·
Graduate Space Elevator Questions and What Ifs
- spancho
- · Replies 11 ·
Undergrad Asteroid Hits Moon / Breaks it up:
- Paul Magill
- · Replies 1 ·
High School Is it possible that (re: earth and moon)
- nukeman
- · Replies 2 ·
Undergrad What existed before the Big Bang?
- 3.14159265
- · Replies 19 ·
Graduate Questioning the cosmological principle
- tom.stoer
- · Replies 82 ·
High School Why Is Earth's Orbit Elliptical and Not Circular
- rajatgl16
- · Replies 7 ·
High School View Milky Way: How to Capture Photos from Earth
- rajatgl16
- · Replies 3 ·
Undergrad Book Research, Astronomical Justification for Plot Device
- john.andrews
- · Replies 6 ·
Graduate Does the universe have flat spacetime regions or is it curved everywhere?
- Hyperspace2
- · Replies 10 ·
Stargazing *Quick* - Need to pick between 2 telescopes - Whats better?
- nukeman
- · Replies 9 ·
High School Can amateur radio equipment scan for alien radio transmissions?
- nukeman
- · Replies 1 ·
Graduate What Is the Energy Associated with Dark Matter WIMP Particles?
- PhanthomJay
- · Replies 4 ·
Graduate Entropy of Schwarzschild black holes
- nomadreid
- · Replies 4 ·
Undergrad How do we determine if an exoplanet is tidally locked?
- ladr0n
- · Replies 7 ·
Graduate What is the velocity and direction of the CMB dipole?
- TrickyDicky
- · Replies 2 ·
Graduate Manned missions or colonization of the gas giants.
- Dremmer
- · Replies 5 ·
Graduate Is it mathematically feasible that the moon is hollow?
- Chimps
- · Replies 10 ·
Undergrad Conversion of units (tangential velocity)
- rbnphlp
- · Replies 2 ·
Graduate What is the nature of the gravitational field and its relationship to matter?
- grav-universe
- · Replies 10 ·
Graduate Starring Gravity, Co-Starring Magnetism
- d3x0r
- · Replies 7 ·
Undergrad Physics Topics for Astrophysics?
- Horsefeathers
- · Replies 2 ·
Graduate CMB or nucleosynthesis as empirical tests of gravitation by radiation?
- bcrowell
- · Replies 5 ·
Graduate If the universe is flat and finite?
- zeromodz
- · Replies 13 ·
Undergrad How Does the Moon's Tidal Locking Affect Earth's Rotation?
- scifi5
- · Replies 8 ·
High School How Do You Determine Position and Speed in Space?
- chis
- · Replies 2 ·
Graduate How to Calculate Angles on a Sphere After Multiple Rotations?
- seuren83
- · Replies 2 ·
Is it possible for two planets to merge and still sustain life?
- Lonewolf27
- · Replies 9 ·
Graduate Can we see light from the early universe if it has already passed Earth?
- AJ_2010
- · Replies 20 ·
Does an Infinite Universe Include All Gods and Goddesses?
- Dremmer
- · Replies 3 ·
High School Simple Astronomy questions - Need
- nukeman
- · Replies 8 ·
Graduate Could Cosmic Inflation Be Linked to the Expansion of Quantised Space?
- void_genesis
- · Replies 5 ·
Graduate Can a universe exist without matter?
- Dremmer
- · Replies 5 ·
Stargazing Best Telescope Under $400: Top Picks and Recommendations for US Shoppers
- Littlejenny
- · Replies 4 ·
Undergrad What force causes planets to orbit instead of colliding?
- Kothar
- · Replies 15 ·
Undergrad What Was the Resolving Power of Green Bank's 300-ft Telescope?
- sbarb25
- · Replies 2 ·
Undergrad Taking picture of stars from weather balloon
- Space_launch
- · Replies 2 ·
Graduate Can a planet around a brown dwarf stay stable for billions of years?
- dysfunction
- · Replies 2 ·
Graduate Cosmic Radiation - how is our sun's speed calculated?
- lenfromkits
- · Replies 2 ·
High School How to estimate the length of a month
- Owen-
- · Replies 5 ·
High School Does an accelerating object in space need a force to stop?
- vanwykm
- · Replies 1 ·
High School Why do planets in a solar system orbit on the same plane?
- Electricblue2
- · Replies 2 ·
Graduate Can black holes allow us to break the speed of light?
- Grimstone
- · Replies 5 ·
High School Understanding Sun Storms: Causes, Intensities, and Time Periods
- 2rashmi1993
- · Replies 4 ·
Do Parallel Universes Really Exist?
- anvesh111
- · Replies 28 ·
Undergrad Is the 14 billion year age of the universe based on observation or assumption?
- Vexa
- · Replies 7 ·
Undergrad What is the chemical makeup of stars and how does it affect their lifespan?
- food4thought
- · Replies 7 ·
Undergrad Water in moon ejecta plume (Lcross report 22 Oct.)
- marcus
- · Replies 2 ·