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 we get caught by surprise by an asteroid?
- bostonnew
- · Replies 13 ·
Undergrad The Universe may eventually stabilize?
- Mind Bender
- · Replies 11 ·
Graduate How is my short essay so far? Accurate?
- Carnivroar
- · Replies 7 ·
Graduate Is the Mass of Super-Massive Black Holes Factored into Dark Matter Calculations?
- tanzanos
- · Replies 47 ·
Graduate Is the universe an axiomatic system?
- epkid08
- · Replies 1 ·
Graduate Is the Universe on the outside or inside?
- Mind Bender
- · Replies 1 ·
Graduate Why don't we see a lot of matter around black holes? And can we observe it?
- Stargazer43
- · Replies 4 ·
High School Difference between open and closed Universes?
- Mind Bender
- · Replies 1 ·
Graduate Might inflationary multiverses bumping cause anisotropy?
- DrZforLife
- · Replies 5 ·
Graduate Entropy & Expansion: Physical Interpretation of Maximum Entropy
- rhydo19
- · Replies 17 ·
Graduate How Many New Galaxies Will Appear in the Next Million Years?
- PatrickPowers
- · Replies 1 ·
High School Simplest Understanding of the Universe
- JeremyL
- · Replies 3 ·
Undergrad Parallax formula derivation problem?
- Rishavutkarsh
- · Replies 1 ·
Graduate Is time linear or cyclic in a flat, zero energy universe?
- hiddenvariabl
- · Replies 3 ·
Graduate Observed planets in binary star L4 or L5?
- cephron
- · Replies 1 ·
Graduate Is gravity a force or a property of space?
- smithnya
- · Replies 8 ·
High School Any Ideas for a Good Physics Research/ Report Project
- whitefeather
- · Replies 1 ·
Graduate Entropy, heat death and black holes
- narrator
- · Replies 4 ·
Graduate Absolute Zero and implications
- mmg600
- · Replies 26 ·
Graduate Has entrophy in the univerese increased throughout it's life.
- Lino
- · Replies 20 ·
Undergrad Question about the expansion of space.
- 2sin54
- · Replies 34 ·
Graduate Is the Oort Cloud Large Enough to Encompass a Multi-Stellar System?
- cph
- · Replies 4 ·
Graduate Is Hubble's Law Applicable in a Co-Moving Frame?
- johne1618
- · Replies 4 ·
High School What Are the Orbital Periods of Binary Pulsars?
- teroenza
- · Replies 3 ·
High School Can We Still Receive Images from Voyager Probes?
- RHK
- · Replies 11 ·
High School Belelgeuse turning into a supernovae
- amalmirando
- · Replies 11 ·
Undergrad Singularity in Astrophysics: Meaning & Etymology
- mhozdag
- · Replies 14 ·
Graduate Is Our Expanding Universe the Result of Black Holes from Other Universes?
- korben dallas
- · Replies 24 ·
Graduate I have been told space and time are illusions. What does that mean?
- Jonsson
- · Replies 3 ·
Graduate Is the Universe Actually made of Math
- stglyde
- · Replies 1 ·
Undergrad Zero to infinity can we assume same for universe ?
- rishi.sharma
- · Replies 16 ·
Undergrad A question about star's luminosity, temperature and mass.
- pixel01
- · Replies 33 ·
Graduate Using WMAP to measure the Hubble's constant
- ta66505477
- · Replies 11 ·
High School Which scientist discovered the concept of a collapsing universe?
- Bararontok
- · Replies 1 ·
Graduate How Does a Black Hole Affect Time?
- shifty88
- · Replies 18 ·
Graduate Is Mars' Metallic Core Possible With a Mean Density Lower Than Earth's Mantle?
- luozk123
- · Replies 1 ·
Graduate Big Crunch may create time-reversal?
- Mind Bender
- · Replies 6 ·
Graduate Where does the heat of super-nova end up after black hole formation?
- Khursed
- · Replies 5 ·
Graduate What exists beyond the Universe?
- Mind Bender
- · Replies 2 ·
Graduate How Do Spiral Galaxies Maintain Their Shape?
- twofu
- · Replies 6 ·
Graduate Do Dark Matter and Black Holes Influence Each Other in Cosmology?
- DarkMatterHol
- · Replies 5 ·
Undergrad How sure can we be of the distances in the solar system?
- Warp10
- · Replies 2 ·
Undergrad What was the first mineral formed in the universe?
- Whalstib
- · Replies 7 ·
Graduate How many dimensions are there in a black hole
- vinayjain
- · Replies 55 ·
High School Viewing the Sun and Planets from the Asteroid Belt
- Ender55
- · Replies 7 ·
Undergrad Birth of a Planet: The Formation & Heavy Elements
- wasi-uz-zaman
- · Replies 2 ·
Undergrad How far did the signal of life in earth travelled yet?
- WindScars
- · Replies 2 ·
Graduate Age of Universe (Liddles Modern Cosmology)
- hawker3
- · Replies 3 ·
High School Who Is Right About the Sun's Position and Size?
- Raul Lai
- · Replies 5 ·
Graduate Neutron star spin and rotation axis
- pmghss
- · Replies 2 ·
Graduate Do We Really Understand the Singularity?
- Jim92672
- · Replies 2 ·
High School Why Do Planets Except Mercury Rotate in Same Direction?
- Dana Dedrick
- · Replies 6 ·
Graduate What is the composition of the crust and atmosphere on a neutron star?
- Jimmy Snyder
- · Replies 4 ·
Graduate What Is the Role of Thought in a Predetermined Universe?
- xxxxxxxx
- · Replies 3 ·
Graduate An embarrassing question: what were the boundaries of the universe
- houhou.trad
- · Replies 3 ·
Graduate What makes Dark Energy cause Acceleration of the Expanding Universe?
- edearl
- · Replies 15 ·
Undergrad Thanks for the interesting article.
- Astronuc
- · Replies 6 ·
Graduate Is our entire universe observable?
- Philip7575
- · Replies 19 ·
Undergrad How much did Earth's gravity alter the course of 2005 YU55?
- 2milehi
- · Replies 24 ·
Undergrad Expansion of space and dark matter
- spacetime1234
- · Replies 17 ·
Graduate Do All Black Holes Exhibit Rotation?
- Lino
- · Replies 7 ·
Undergrad Is the Notion of Public Space a Myth?
- John Creighto
- · Replies 35 ·
Graduate Einstein wrong about speed limit?
- DarkMatterHol
- · Replies 2 ·
Undergrad What causes this shell of light around the Earth in this vedio?
- Spinnor
- · Replies 8 ·
Graduate Oort Cloud Dynamics: Speculations on Origins in a Sci-Fi Novel
- Jack Dash
- · Replies 3 ·
Graduate Expanding Universe vs. Shrinking Matter
- zadignose
- · Replies 23 ·
High School How do we know the universe is expanding?
- anonchi
- · Replies 9 ·
Stargazing What are the limitations of astrophotography and how can they be overcome?
- Andy Resnick
- · Replies 34 ·
Graduate Space-Time Black Holes: Measuring Warped Space/Time
- THADONDARA
- · Replies 5 ·
Undergrad How long would daylight last on Earth if the sun disappeared?
- adjkgh
- · Replies 30 ·
Graduate Universe expansion + light speed limit -> scale factor linear in time?
- johne1618
- · Replies 10 ·
Undergrad Are exploding supernovae responsible for heavy metal content in ancient stars?
- manojr
- · Replies 6 ·
Graduate How does the twin paradox work in a circular orbit?
- phinds
- · Replies 16 ·
Graduate Low entropy big bang Where am I going wrong with this interpretation?
- Geodesic Worm
- · Replies 17 ·
Graduate Big crunch versus the Cosmological Constant
- zheng89120
- · Replies 2 ·
Graduate Kinetic energy of gases in stars
- Piano man
- · Replies 3 ·
Undergrad Astrobiology Missions, whats being proposed?
- skydivephil
- · Replies 3 ·
Graduate Can anyone tell me the basics of Quasar?Note: Means that how it is
- vinayjain
- · Replies 26 ·
High School Spotting 2005 YU55: Instructions & Speed Info
- DaveC426913
- · Replies 42 ·
Undergrad Can variable stars become quickly non variable and viceversa?
- Aidyan
- · Replies 6 ·
Undergrad Earth and Moon Orbits Aligned: Consequences?
- dreamgirl.360
- · Replies 3 ·
Undergrad Could women be better suited for long distance space travel?
- PhysicsPost
- · Replies 48 ·
High School Can Astronomical Objects Orbit Around Satellites?
- wukunlin
- · Replies 12 ·
Graduate Unraveling the Mysteries of Dark Matter: Examining the Role of Light and Gravity
- Zula110100100
- · Replies 2 ·
Graduate Arto Annila - Universe's expansion may be understood without dark energy
- TNick
- · Replies 10 ·
Graduate Why is the existence of The Big Bang agreed upon?
- MindAstronaut
- · Replies 45 ·
Graduate Energy savings with space elevator
- bksree
- · Replies 19 ·
Graduate Four Forces vs. Fifth Force: Physicist's Insight
- chaszz
- · Replies 35 ·
Graduate Is the Universe growing in size?
- mkarger
- · Replies 5 ·
Graduate What Reference Frame Determines the Age of the Universe?
- Eaglespike
- · Replies 5 ·
Number of stars within 150 light years of us?
- jerich1000
- · Replies 4 ·
Graduate Confirmation of varying fine-structure constant
- TrickyDicky
- · Replies 3 ·
Graduate Would a collapsing universe break the Law for entropy
- skeleton
- · Replies 16 ·
Graduate Expansion speed and accelleration question
- narrator
- · Replies 12 ·
High School Light Pollution & National Dark Sky Week
- PhysicsPost
- · Replies 1 ·
Graduate Did the Universe's Components Emerge Simultaneously?
- JeremyL
- · Replies 1 ·
Graduate Are There Laws Governing the Passage of Time?
- thedragonbook
- · Replies 3 ·
Graduate Twinkle, twinkle, little star
- Andy Resnick
- · Replies 4 ·
Graduate The Big Bang and CP Violation: Where Did the Mass Go?
- Khursed
- · Replies 4 ·
Graduate Effect of the Galactic plane on the COBE CMBR measurements
- Tanelorn
- · Replies 7 ·