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 Why does light travel at light speed?
- jackpot337
- · Replies 62 ·
Graduate Is the nature of space and time still a mystery?
- Curious6
- · Replies 10 ·
Graduate Scientific Logic for God's existence
- Dr. Raj Baldev
- · Replies 47 ·
Graduate Unexplained Gravitational Phenomena in a Donut-Shaped Universe
- rob_we
- · Replies 2 ·
Graduate Is Our Three-Dimensional Reality Just a Holographic Illusion?
- PFanalog57
- · Replies 5 ·
Graduate Is the Universe Infinite or Finite: What Theories Suggest?
- calculii
- · Replies 29 ·
Stargazing Build Custom Telescope Mount: Tips & Advice
- Physicsisfun2005
- · Replies 2 ·
Stargazing What was the first object you saw through a telescope?
- whydoyouwanttoknow
- · Replies 17 ·
Graduate Is the Universe Closed, Flat or Open?
- Curious6
- · Replies 18 ·
High School City-Sized Asteroid to Pass Earth This Fall
- Evo
- · Replies 3 ·
Able to catch the meteor shower this morning
- check
- · Replies 16 ·
Graduate Parallel universes almost certainly do not exist
- Sven Tingblad
- · Replies 12 ·
High School The Colors of Stars: Why Are Some Red and Others White or Blue?
- Tree Penguin
- · Replies 4 ·
Graduate Is Space Merely a Manifestation of Matter and Energy?
- mee
- · Replies 40 ·
Why the universe want to know itself?
- Will_C
- · Replies 15 ·
Graduate Dear Nereid and Phobos (seat belt on) can we talk about redshifts?
- rob_we
- · Replies 4 ·
Graduate Furthest Point on Earth from the Center: Mt Chimburazo, Ecuador
- mee
- · Replies 8 ·
High School Is Research on Gravity Lifts a Step Towards Defying Gravity?
- Pythagorean
- · Replies 6 ·
Undergrad How do we detect x-rays from the center of our galaxy?
- turin
- · Replies 14 ·
Graduate Expanding Universe - weakening gravity?
- Scott Sieger
- · Replies 7 ·
High School Hubble hit by instrument failure
- Ivan Seeking
- · Replies 8 ·
Graduate Dark Matter & Gravitational Effects on Galaxies
- Moose352
- · Replies 4 ·
Undergrad Is Isaac Asimov's Moon-Planet Theory Valid?
- Starfleet2222
- · Replies 8 ·
Undergrad Is Bush's Vision for Space Exploration Grounded by Budget Cuts?
- Ivan Seeking
- · Replies 16 ·
Graduate Stretched space far from our own
- woodysooner
- · Replies 49 ·
High School Why Are We Orbiting Earth Instead of Landing on the Moon Again?
- bozo the clown
- · Replies 176 ·
Graduate How was time and space created at the Big Bang?
- niranjan
- · Replies 20 ·
Graduate Final project - fate of the universe - need ideas
- brum
- · Replies 4 ·
Graduate What caused the planets to aggregate as they did?
- Rader
- · Replies 16 ·
Graduate Why the Moon Looks Big at the Horizon and Smaller When Higher Up.
- Rader
- · Replies 2 ·
Graduate Calculating viewing times of satellite from groundstation
- Ed
- · Replies 16 ·
Undergrad Black holes do not collapse to singularity>
- think
- · Replies 18 ·
Have you witnessed a dazzling Iridium flare in the night sky?
- Artman
- · Replies 32 ·
Stargazing Best telescope for a young astronomer under $750?
- nautica
- · Replies 9 ·
Graduate Gamma Ray Bursters: Cause of Short-Lived Flashes of Light
- kurious
- · Replies 16 ·
Graduate The Hawking Effect: Unruh-Schutzhold Paper
- Olias
- · Replies 1 ·
Graduate Could Superluminal Light Speeds Impact Theories on the Universe's Cold Death?
- multifaciatus
- · Replies 2 ·
Graduate Could Our Universe Have Originated from Another Universe's Black Hole?
- woodysooner
- · Replies 19 ·
Undergrad Favoured theory for planetary formation
- wolram
- · Replies 7 ·
Graduate Why Do Some Stars Explode?
- Antonio Lao
- · Replies 8 ·
Graduate What was the Maximum Energy Density at the Onset of the Big Bang Expansion?
- marcus
- · Replies 24 ·
Graduate Supernova Ignition: Does Blackhole Mass Influence Star Formation?
- Olias
- · Replies 5 ·
Graduate Explaining B-Field of N-Star: How Neutron Stars Have Magnetic Fields
- turin
- · Replies 2 ·
Graduate Vacuum energy in gravitational fields
- turbo
- · Replies 6 ·
Graduate What would the universe be like
- wonderer
- · Replies 88 ·
Undergrad Probability of Intelligent Life in Our Galaxy
- bozo the clown
- · Replies 51 ·
Graduate Hawking Radiation: What it is and How it Relates to the Schwarzschild Radius
- woodysooner
- · Replies 4 ·
Graduate Fine structure constant changes over time
- kurious
- · Replies 22 ·
Undergrad Space as a vacuum and earth's atmosphere
- Leonidas
- · Replies 9 ·
Undergrad Cosmological Red Shift: What Is It & How Does It Relate to Gravity?
- lvlastermind
- · Replies 5 ·
Graduate Is a larger initial size for the universe possible?
- kurious
- · Replies 13 ·
Graduate The most significant, immediate relic of primordial quantum mechanics?
- Loren Booda
- · Replies 13 ·
The Universe Is Alive And Thinking
- RAD4921
- · Replies 16 ·
What came first CYBERSPACE or OUTERSPACE?
- Blair
- · Replies 21 ·
Could Other Universes Exist Beyond Our Own?
- HIGHLYTOXIC
- · Replies 8 ·
Graduate Understanding Type II Supernovae: N-Star vs. BH Supernova Explained
- turin
- · Replies 4 ·
Graduate Is the existence of Hawking Radiation compatible with the Big Bang theory?
- Ian
- · Replies 7 ·
Undergrad Explaining 4D Space-Time in Simple Terms
- Omid
- · Replies 7 ·
High School Determining a Planet's Age Based on Mountain Ranges
- Mattius_
- · Replies 2 ·
Undergrad Why do neutron stars have magnetic fields
- Rodney
- · Replies 4 ·
Graduate What Is the Substance of Space and Its Role in Our Perception?
- omin
- · Replies 5 ·
Undergrad What mass is lost after a hypernovae?
- taylordnz
- · Replies 10 ·
Graduate Dark energy + missing antimatter
- kurious
- · Replies 7 ·
High School Explaining Singularity: A Beginner's Guide
- woz
- · Replies 7 ·
Undergrad Determining orbits from R.A., Dec, & time
- bohr
- · Replies 12 ·
Graduate Steven Hawking / MKaku. Who's right about Black Holes?
- Sean Gonzalez
- · Replies 8 ·
Graduate Black Holes: Comparing Hawking & Kaku Theories
- Sean Gonzalez
- · Replies 1 ·
Graduate Observational Difference Between Neutron Star & Black Hole
- turin
- · Replies 3 ·
Graduate Do Black Holes Truly Have Zero-Point Volume Singularities?
- taylordnz
- · Replies 4 ·
UFO Sighting: Is It Real or Imaginary?
- Grizzlycomet
- · Replies 2 ·
Graduate Has Stephen Hawking Solved the Black Hole Information Paradox?
- Mentat
- · Replies 8 ·
Undergrad Black holes and dark matter holding galaxies together?
- Themuffinman
- · Replies 9 ·
Graduate How Do Black Holes Create Dark Energy and Influence Universal Expansion?
- kurious
- · Replies 19 ·
Graduate CalTech BH answer contradicts Hawking's
- marcus
- · Replies 4 ·
Undergrad Are There Non-Rotating Objects in Space?
- e(ho0n3
- · Replies 2 ·
Discover the Ultimate Guide: Gravitation by Misner, Thorne, and Wheeler
- hemmul
- · Replies 7 ·
Graduate Is Dark Matter Made of Ordinary Matter or Something Exotic?
- force5
- · Replies 15 ·
Graduate How Much Gravity Does a Black Hole Need to Contain Light?
- terrabyte
- · Replies 7 ·
Graduate Time Travel: No spaceships, no wormholes
- kokain
- · Replies 27 ·
Graduate Which force drives the expansion of the universe?
- Pietro
- · Replies 12 ·
Undergrad Gigantic Black Hole Collision: Andromeda & Milky Way
- pnjabiloafer
- · Replies 19 ·
Graduate Are There Stars with Highly Eccentric Orbits Around the Center of Their Galaxy?
- alpha_wolf
- · Replies 1 ·
Graduate Did Hawking's Dublin Talk Redefine Quantum Gravity Observables?
- marcus
- · Replies 8 ·
Undergrad Cause of Billiard Ball Spin: Celestial Connection?
- IMMSHARMA
- · Replies 1 ·
Graduate Are White Holes the Key to Understanding Black Holes and Quasars?
- kernelpenguin
- · Replies 6 ·
High School Planet formation DOES happen in slow motion
- pnjabiloafer
- · Replies 8 ·
Undergrad Why Does the Moon Cause Tides despite Sun’s Greater Force?
- Parth Dave
- · Replies 13 ·
Graduate Can a small black hole exist inside a larger black hole?
- kurious
- · Replies 3 ·
High School Odds of Earth Impact vs Winning Powerball
- bozo the clown
- · Replies 16 ·
Graduate Is there a limit to the validity of laws as the universe expands?
- kurious
- · Replies 13 ·
Graduate Do Black Holes Generate Dark Energy?
- kurious
- · Replies 4 ·
Undergrad Can Objects Enter a Black Hole from an Angle?
- Echo 6 Sierra
- · Replies 8 ·
Undergrad Shock Wave in Space: Vacuum or Medium?
- wolram
- · Replies 4 ·
Graduate Is the Sun Distorting Earth's Space-Time?
- oscar
- · Replies 30 ·
Graduate What Does XMM-Newton Reveal About Dark Energy in the X-ray Universe?
- wolram
- · Replies 167 ·
Graduate Can black holes ever truly disappear?
- s4syth
- · Replies 14 ·
Graduate Do Black Holes Emit Higgs Particles in Hawking Radiation?
- kurious
- · Replies 1 ·
Graduate What Would Happen if a White Hole Collided with a Black Hole?
- Tim
- · Replies 17 ·
Graduate Can the Booda Cosmic Isotropy Duality Hypothesis Be Proven?
- Loren Booda
- · Replies 2 ·
High School Astronomy Club: A Student's Adventure in Learning
- Gale
- · Replies 10 ·