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 Is the Drake Equation Overestimating Intelligent Life in the Universe?
- Stu21
- · Replies 18 ·
Graduate Could a Star Collapse into a Quark Star Instead of a Black Hole?
- AbsoluteZer0
- · Replies 3 ·
High School Looking further and further into the past?
- pwdrmntainski
- · Replies 2 ·
Graduate Fields permeating spacetime - aether?
- jnorman
- · Replies 3 ·
High School What Is the Diameter of the Observable Universe?
- Myslius
- · Replies 9 ·
Undergrad Does time move faster while measured from space or from earth?
- Rorkster2
- · Replies 10 ·
Graduate If the moon was vapourised, would it recondense or get blown away by solar wind?
- jetwaterluffy
- · Replies 8 ·
Stargazing How Do I Choose the Right Optical Lenses for Building a Telescope?
- DrCy
- · Replies 4 ·
Stargazing Problem about calculating focal length of a telescope
- Blacky&Imy
- · Replies 2 ·
Undergrad Unraveling the Chaos: Examining the Birth and Behavior of the Universe
- Grimstone
- · Replies 24 ·
Undergrad Space Time Expansion: How Galaxies Formed
- Brook
- · Replies 21 ·
Graduate Is Newton's Law a Result of Constant Volumetric Expansion?
- MDEarl
- · Replies 19 ·
Graduate Interstellar Medium Around Sol / Interstellar Ramscoop
- MattRob
- · Replies 7 ·
Graduate Is eternal inflation possible in LQC?
- MathematicalPhysicist
- · Replies 23 ·
Undergrad 10 light years but destroyed 6000 years ago?
- heartyface
- · Replies 7 ·
Graduate Dark matter/Dark antimatter Asymmetry?
- alemsalem
- · Replies 6 ·
Graduate How is energy/matter density distributed through the universe?
- Rorkster2
- · Replies 4 ·
Graduate Dark Matter: Interacting Particles & Gravitational Forces
- someGorilla
- · Replies 3 ·
Undergrad What is the width of the Lagrange points?
- CowedbyWisdom
- · Replies 1 ·
Graduate How much mass does 'Dark Matter' and 'Nothing' (empty space) have?
- Rorkster2
- · Replies 6 ·
Graduate Is the proper distance the shortest distance in FLRW universe?
- andrewkirk
- · Replies 7 ·
Graduate Why Doesn't Dark Energy Expand Galaxies?
- g.lemaitre
- · Replies 30 ·
Undergrad Good Introductory Book/Article to Dark Energy?
- charmander
- · Replies 4 ·
Graduate Proposed dark matter detector - how does it work?
- Roo2
- · Replies 11 ·
Graduate Can Space Expand Faster Than the Speed of Light?
- DARKSYDE
- · Replies 10 ·
Undergrad Do scientists know why planets orbit stars on the same dimentional plane?
- Rorkster2
- · Replies 4 ·
Graduate Why Doesn't the Comoving Hubble Length Always Increase?
- alialice
- · Replies 9 ·
Graduate Size/Mass of a planet needed in order to have a molten core or a magnetic field?
- jarroe
- · Replies 3 ·
Undergrad Speed Of Light In Relation To The Size Of The Universe
- CowedbyWisdom
- · Replies 8 ·
Undergrad When did they discover the Gas Giants were fluid?
- mopc
- · Replies 4 ·
Graduate Kepler's Equation and its choices
- solarblast
- · Replies 9 ·
High School How many degrees of view is cosmic microwave background?
- Rorkster2
- · Replies 3 ·
Graduate Question about the expansion of space.
- weinie
- · Replies 23 ·
High School How do you define a planet's rotation?
- skiller
- · Replies 12 ·
Graduate Pulsar Spectrum: The Mystery of Neutron Star's Black Body Emission Revealed
- alialice
- · Replies 2 ·
Graduate Need Help Writing a Sci-Fi Film Plot with Astronomy
- closecall17
- · Replies 7 ·
Graduate Did all 10^80 particles exist after the first 3 minutes?
- g.lemaitre
- · Replies 15 ·
Undergrad What happens to you if you get pulled into a black hole?
- DrPhy
- · Replies 26 ·
Graduate How is it possible to live past the event horizon?
- spacetimedude
- · Replies 19 ·
Graduate Creating Artificial Gravity for Spacecraft Travel
- Robert_K
- · Replies 5 ·
High School Night sky and supernova questions
- Government$
- · Replies 9 ·
Undergrad How is molecular hydrogen detected?
- JDoolin
- · Replies 95 ·
Undergrad Angular momentum and eccentricity
- Alexrey
- · Replies 2 ·
Graduate Life in the process of universe: the goal or just a side effect?
- Graal
- · Replies 17 ·
Graduate Is the universe 13.7 Billion years old? There seems to be a contradiction
- surajt88
- · Replies 48 ·
Graduate An Infinite Lapse of Time is Impossible and Unscientific
- james.goetz
- · Replies 43 ·
High School Pluto's color changes as it makes its closest approach?
- jarroe
- · Replies 1 ·
Jumping into a earthcenter tunnel
- schiz0ai
- · Replies 4 ·
Undergrad Speed through the universe we are moving?
- jarroe
- · Replies 4 ·
Undergrad Is the Expanding Universe Affecting Our Solar System?
- Ikon Rahu
- · Replies 37 ·
Graduate What is the system of angular units used by astronomers of Venus?
- kapella
- · Replies 2 ·
Graduate Could we see Earth 75.2 years ago using light from a supermassive black hole?
- kevpatts
- · Replies 6 ·
High School What Were the Two Bright Yellow Lights in the Sky on July 10th?
- Aero51
- · Replies 4 ·
Graduate Can Negative Changes in Entropy Occur in the Universe?
- Aero51
- · Replies 26 ·
High School Is the Universe Really Flat and What Lies Above or Below the Earth?
- Erik B
- · Replies 3 ·
Undergrad Is this a misleading representation of boomerang results
- jerusalem
- · Replies 56 ·
Graduate CERN particle announcement related to dark matter / energy?
- Lino
- · Replies 6 ·
Graduate Why Are Galaxies Rushing Apart According to Weinberg's First Three Minutes?
- g.lemaitre
- · Replies 5 ·
Graduate Other dimensions have been proven .
- jarroe
- · Replies 15 ·
Graduate Measuring the Accuracy of EM Spectrum Shift: Red vs Blue
- Bjarne
- · Replies 11 ·
Undergrad Calculating orbits of moons, when both the planet and star are involved.
- sydan
- · Replies 8 ·
Graduate How Flat is Our Universe Really?
- marcus
- · Replies 5 ·
Graduate Does a Space Warp Bubble Move Through Space or Does Space Move Around It?
- jarroe
- · Replies 3 ·
Graduate Questioning Hubble's Law: Does the Expanding Universe Theory Hold Up?
- khurramc
- · Replies 3 ·
Graduate Cosmological expansion vs. stretching
- Neuroglider
- · Replies 36 ·
Graduate Dark energy related to 10-dimensional universe
- vened
- · Replies 2 ·
Graduate Could the Universe Have Regions of Expansion and Collapse?
- coolcalx
- · Replies 27 ·
Graduate Post big bang matter/energy distribution
- jarroe
- · Replies 2 ·
Graduate Can black holes be disintegrated from a sufficiently powerful explosion?
- Bararontok
- · Replies 34 ·
Graduate Imposssible to see light that left a star 13.4 billion yrs ago
- aboro
- · Replies 20 ·
Graduate Dark Matter - How strong is it at a galaxy periphery?
- Bjarne
- · Replies 1 ·
Graduate Why is a gravitational field negative energy ?
- andrewkirk
- · Replies 5 ·
Undergrad Gravity in the Universe: Is There a Weakest Force?
- Lino
- · Replies 10 ·
Undergrad Size of the Universe? I'm confused.
- TheSwamper
- · Replies 7 ·
Graduate Would the universe be the same if it was reset?
- ResolutE
- · Replies 27 ·
Undergrad Calculating distance from redshift
- chris1969
- · Replies 6 ·
Graduate In what sense is the standard model enormously successful
- g.lemaitre
- · Replies 14 ·
Undergrad Dark matter is the thread connecting galaxy clusters
- arabianights
- · Replies 3 ·
Graduate Plotting planetary movements through space
- Rakky
- · Replies 8 ·
Graduate What is the universe itself made of beyond its contents?
- WMan
- · Replies 7 ·
Is This CM Book by Roy on Orbital Motion?
- solarblast
- · Replies 2 ·
Graduate Is Our Universe Just a Balloon in an Infinite Matrix?
- megacal
- · Replies 2 ·
Graduate Explosion picture: most common mistake
- marcus
- · Replies 2 ·
Graduate Did a Higgs Boson trigger the big bang?
- Magnus Warhol
- · Replies 6 ·
Graduate Calculating the Size of the Universe
- denism
- · Replies 32 ·
Undergrad Critical density in our expanding universe
- Positralino
- · Replies 4 ·
Graduate Could dark matter be invisible bound states of ordinary matter or ehm, aliens?
- Antti
- · Replies 1 ·
Graduate Is the Universe Spinning? | General Relativity
- Always curious
- · Replies 31 ·
Graduate Is the Sun's luminosity in specific filters greater than its overall luminosity?
- StarDweller
- · Replies 1 ·
Undergrad Venus Spinning Slower Than Thought
- Andre
- · Replies 25 ·
Graduate Eight steps to the understanding the CEH
- marcus
- · Replies 1 ·
Graduate Why is the Universe electrically neutral?
- lpetrich
- · Replies 2 ·
Graduate Exploring the Properties of Gravitational Waves: Evidence, Structure, and Speed
- SinghRP
- · Replies 6 ·
Undergrad What if time is not linear? Can it be experienced out of sequence?
- cdot
- · Replies 7 ·
Graduate Calculating Force and Energy Requirements for a Reactionless Drive in Space
- MIKESMIND
- · Replies 4 ·
Graduate Higgs & Inflaton: Does New Boson Discovery Change Anything?
- skydivephil
- · Replies 7 ·
Undergrad Is space really absolutely nothing?
- NeptuniumBOMB
- · Replies 20 ·
Graduate What Does Density Contrast in the Universe Mean in the Context of Chaplygin Gas?
- kptsilva
- · Replies 10 ·
Graduate What is absolute in this universe?
- Nikhilb
- · Replies 24 ·
Undergrad Distance time travels per second
- Pricey
- · Replies 3 ·