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 What's the farthest distance a star visible to the naked eye can still be seen?
- eehiram
- · Replies 19 ·
Undergrad Mapping 21cm Neutral Hydrogen with Radio Telescope
- JohnnyTheFox
- · Replies 1 ·
Graduate Entertain an idea from an ignorant student for a minute
- Just some guy
- · Replies 1 ·
Graduate What can weak lensing be used for?
- oldman
- · Replies 2 ·
Graduate Nucleosynthesis and Hubble expansion
- emanaly
- · Replies 10 ·
Undergrad Searching for Intelligent Life: Understanding Radio Wave Filters
- Entity
- · Replies 3 ·
Graduate Is the gravitational binding energy formula different for stars and galaxies?
- kmarinas86
- · Replies 2 ·
Graduate Black holes, can we see them directly?
- Chaos' lil bro Order
- · Replies 6 ·
Graduate Two black holes separated by more than one Schwarzschild radii
- kmarinas86
- · Replies 3 ·
Graduate Cosmological geometries that may function as blackbodies
- Loren Booda
- · Replies 1 ·
Graduate Is Speed Real and Who Has the Correct Frame of Reference in the Universe?
- ukmicky
- · Replies 3 ·
Graduate Block Universe / Frozen Universe / Block Time
- jrrship
- · Replies 1 ·
Graduate Entropy of Cosmological Event Horizon
- Mike2
- · Replies 28 ·
Graduate Andromeda 5x bigger than previously thought.
- Chaos' lil bro Order
- · Replies 1 ·
Graduate Do the L4 and L5 points travel in a geodesic?
- kmarinas86
- · Replies 1 ·
Graduate Is the Three-Body Problem Unsolvable?
- Saketh
- · Replies 10 ·
Where Can I Find Dates and Locations of Future Solar Eclipses?
- gone gator
- · Replies 1 ·
Stargazing Leaving Telescope Out: Pros & Cons
- Bob3141592
- · Replies 5 ·
Undergrad Why Is the Night Sky Dark If the Universe Is Infinite?
- vincentm
- · Replies 36 ·
Graduate Universe Was Born in a Black Hole?
- pivoxa15
- · Replies 7 ·
High School Mystery of the Bright Green Meteor: Is it Common?
- interested_learner
- · Replies 3 ·
Graduate Gravity leaving a permanent indention?
- Nexus555
- · Replies 16 ·
Stargazing High-Altitude Floating Space Telescope
- sanman
- · Replies 15 ·
Graduate The universe should be billions of times brighter than the Milky Way?
- kmarinas86
- · Replies 4 ·
Graduate SO(10) -> SU(3) x SU(2) x U(1) -inflation?
- EL
- · Replies 3 ·
Graduate Reaching Other Stars, Colonizing Planets
- sanman
- · Replies 6 ·
Graduate Why is a blackhole a one way ride
- ukmicky
- · Replies 15 ·
Graduate Is the Concept of a Self-Replicating Unmanned Spacecraft Feasible?
- {~}
- · Replies 3 ·
Undergrad Ratio of Orbital Distance to Transit Time
- Panda
- · Replies 4 ·
High School What is Gravity? Understanding Its Role in Universe Formation
- kleinma
- · Replies 42 ·
Graduate Evidence for a flat universe vs. circular logic
- kmarinas86
- · Replies 6 ·
Undergrad Why Don't Black Holes Absorb Hawking Radiation?
- Swapnil
- · Replies 15 ·
Undergrad Unraveling the Mysteries of Jupiter's Auroras
- Baiji
- · Replies 2 ·
Graduate Where Can I Find Tutorials on Orbital Elements Perturbations?
- dagmare
- · Replies 1 ·
Graduate Calculating the Radius of a Neutron Star
- sammyz
- · Replies 3 ·
High School Theories and the begining of universe
- navneet1990
- · Replies 5 ·
Graduate White Dwarf + Hydrogen Gas: Can It Revive Fusion?
- El Nexus
- · Replies 2 ·
Undergrad Where should I begin with Astrophysics?
- Bart
- · Replies 41 ·
High School The Sun Exploding: Effects on Earth
- Glynis
- · Replies 2 ·
Undergrad Finding the Exact Time of Alignment of Earth, Sun and Center Sun
- osirisisis
- · Replies 10 ·
High School Season Indicators: Know When Seasons Start & End
- navneet1990
- · Replies 16 ·
Graduate What Are the Least Researched Topics in Observational Astrophysics?
- moonquark
- · Replies 6 ·
Undergrad What Factors Affect the Color of a Star from Earth?
- ranger
- · Replies 3 ·
Undergrad Can Gravity Explain the Tilt of Mars and Neptune?
- krateesh
- · Replies 10 ·
High School How Can I Identify Constellations in the Night Sky?
- mubashirmansoor
- · Replies 6 ·
Graduate How does the cosmological event horizon change the matter density?
- Mike2
- · Replies 1 ·
Undergrad Speed of Gravity: Is It As Fast As Light?
- TheMuses
- · Replies 5 ·
High School What Are Tidal Forces and How Do They Affect Different Bodies?
- Zeit
- · Replies 4 ·
Undergrad Why Symmetry of Tides on Earth (influenced by moon, sun)
- Ouabache
- · Replies 3 ·
Discover Top Reference Books for Studying the Sun | Nitya's Book Recommendations
- nityah
- · Replies 2 ·
Graduate Mysteries of White Dwarf Formation: Massive Diamonds Inside?
- Kitten Kaboodle
- · Replies 4 ·
Undergrad Where Can I Find a Comprehensive Database of Supernovae?
- Andre
- · Replies 11 ·
High School Find the error in this paragraph about physics
- 8parks11
- · Replies 5 ·
The Way Back to Your Universe Test
- Evo
- · Replies 15 ·
Undergrad Siobhan Morgan's cosmology calculator has a new url
- marcus
- · Replies 5 ·
High School Coordinate conversion calculator
- big man
- · Replies 2 ·
Graduate Could Parallel Universes Be Created by Colliding Branes?
- ptalar
- · Replies 1 ·
Undergrad How do we know how much hydrogen the sun has?
- ranger
- · Replies 3 ·
Water Flows on Mars: What We Make of This Article
- Azael
- · Replies 11 ·
High School .Is Water on Mars? Colonization: Frozen or Sent Men?
- Integral
- · Replies 18 ·
High School Are There Infinite Earths in Infinite Space?
- ||spoon||
- · Replies 13 ·
Undergrad Space Exploration and its effect on the Earth's Oxygen supply: I have a question
- SAPierce2006
- · Replies 15 ·
Graduate Relativistic effects on interior of our sun?
- chemisttree
- · Replies 5 ·
High School Just a little question on orbits.
- Delzac
- · Replies 9 ·
MySpace Group Hacked And Deleted
- zoobyshoe
- · Replies 10 ·
Undergrad How does gravity affect rotation?
- Kirl
- · Replies 3 ·
Undergrad Random MOND theory / dark matter question(possibly really easy to answer)
- lampshade
- · Replies 4 ·
Graduate Understanding Friedmann Equations Equation of State: Step-by-Step Walkthrough
- parsifal
- · Replies 2 ·
Undergrad How can a star turn into a black hole, with the law of conservation of mass?
- ilikefun411
- · Replies 4 ·
Stargazing Fixing Vertical Flipping in Prismatic Telescopes: A Troubleshooting Guide
- [AFT]
- · Replies 3 ·
Undergrad Why does Jupiter have more gravity than its density should allow?
- Jota
- · Replies 9 ·
Graduate Questions on the Movement of Stars
- stardrop
- · Replies 3 ·
Undergrad Do hypernova events really exist, is there any proof for one existing?
- Wellsi
- · Replies 13 ·
Graduate End of the Sky: Is There a Limit?
- chandubaba
- · Replies 6 ·
Graduate Is Carlos Barcelo's Research Redefining Cosmology and Gravity?
- Chronos
- · Replies 52 ·
Graduate Can we hit black hole's surface without dying?
- chandubaba
- · Replies 21 ·
Graduate White Dwarf Radii: Minimizing Total Energy
- quasar987
- · Replies 7 ·
Graduate What effects do the collision of galaxies have on the solar system?
- Vast
- · Replies 7 ·
High School Understanding Kepler's Laws and Parallax in Astronomy
- Wellsi
- · Replies 6 ·
Graduate Dark Matter Evidence: Baryonic & Non-Baryonic
- SupersonicMan
- · Replies 13 ·
Graduate Why Doesn't This Black Hole Emit X-rays?
- Labguy
- · Replies 1 ·
Graduate Is the Axis of Evil still a valid feature in the CMB data?
- Garth
- · Replies 8 ·
Graduate Could Multiple Stars Be Hiding in Eta Carinae's Nebula?
- Wellsi
- · Replies 2 ·
Graduate Help wanted with accelerated expansion and gr
- Rip
- · Replies 21 ·
Graduate Why Is the Chandrasekhar Limit Estimated with Unrealistic Assumptions?
- quasar987
- · Replies 3 ·
Stargazing First up is M13, 20 exposures of 30 seconds
- Brinx
- · Replies 9 ·
Graduate Scientific explanation of the Universe
- Handsome_Dick
- · Replies 8 ·
Graduate Does G vary because of Mach's Principle?
- Garth
- · Replies 13 ·
Graduate How Do Upcoming Surveys Constrain Cosmological Models and Dark Energy?
- SupersonicMan
- · Replies 3 ·
Stargazing Telescope Advice for Military Employee in Middle East - $1000 - $2000
- gqusaf
- · Replies 7 ·
Graduate Can Photons Emit Gravitons in the Absence of Black Holes?
- .ultimate
- · Replies 2 ·
Undergrad Last edited by a moderator: May 2, 2017
- hasman
- · Replies 14 ·
Graduate What would happen if two black holes collided?
- ocalhoun
- · Replies 2 ·
Undergrad Uncovering the Composition of Space: A Scientific Explanation
- nannoh
- · Replies 11 ·
Undergrad Are Black Holes Universal Recycling Bins?
- Epircus
- · Replies 15 ·
Graduate The Possibility of Curved Spacetime, Black Holes, and Big Bang. .
- cosmopot
- · Replies 1 ·
High School Far Side of Sun: Can Satellites View Opposite Side?
- RJ Emery
- · Replies 9 ·
Graduate WMAP and Big Crunch: Is the Universe's Fate Sealed?
- vincentm
- · Replies 1 ·
Graduate Can science and technology give us complete control over the universe?
- octelcogopod
- · Replies 2 ·
Graduate Exploring Binary Pulsar Mechanics: Lagrangian Formulations
- Logarythmic
- · Replies 1 ·