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 Discover the Maximum Wavelength of M101 Visible to the Naked Eye
- menager31
- · Replies 2 ·
Undergrad Habiting Planets: Is It Possible?
- bassplayer142
- · Replies 17 ·
Graduate What Could Have Happened Before the Big Bang Theory?
- x3r0
- · Replies 13 ·
Graduate Einstein-deSitter Expansion Questions v.2
- jonmtkisco
- · Replies 1 ·
Undergrad Supernova in Our Galaxy: Impact on Earth and Frequency of Occurrence
- paulselhi
- · Replies 8 ·
Undergrad White Dwarf GD 362 - signs of earthlike planets
- Astronuc
- · Replies 2 ·
Graduate Is a toroidal black hole possible?
- Meatbot
- · Replies 4 ·
Experience the Magic of Across The Universe - A Must-See Film!
- ZapperZ
- · Replies 17 ·
Graduate Parallel Universes: The Mind-Boggling Reality Confirmed by Oxford Scientists
- SF
- · Replies 6 ·
Graduate Einstein-deSitter Expansion Questions
- jonmtkisco
- · Replies 24 ·
Undergrad What is the Relationship Between the Age and Size of the Universe?
- timrod1011
- · Replies 1 ·
Graduate Quantum Gravity Explained: What It Is and Resources to Learn More
- sruthisupriya
- · Replies 1 ·
Graduate How do QG people evolve particles into the theory?
- wolram
- · Replies 2 ·
High School Can You Hunt for Comets? Understanding the Art of Comet Hunting
- Saladsamurai
- · Replies 3 ·
Graduate The spacetime landscape of a black hole
- Ascending One
- · Replies 1 ·
Graduate Measuring Red Shift with Accuracy
- wolram
- · Replies 2 ·
Graduate Quantum Mechanics and the Universe
- Luke987
- · Replies 19 ·
Graduate Does Spacetime Curve Into Hidden Dimensions? Understanding Curvature
- PhanthomJay
- · Replies 14 ·
Undergrad What limits the ability to directly image distant objects with telescopes?
- Holocene
- · Replies 3 ·
Graduate Earliest time of light emission after Big Bang
- sir_manning
- · Replies 4 ·
High School Request: comet projectory calculating tool
- Keba
- · Replies 4 ·
Doomsday Scenarios: What Astronomical Process Poses Greatest Risk?
- Breathe the o2
- · Replies 2 ·
Dark matter revealed in video feedback
- Roger Zimmerman
- · Replies 1 ·
Graduate Lambda contibutes to bending (says Wolfgang Rindler)
- marcus
- · Replies 3 ·
Undergrad U think that the univers is realy expanding? think again
- darkness_limits
- · Replies 10 ·
Graduate How to Calculate Orbital Approach and Docking in the Presence of a Gravity Well?
- MonstersFromTheId
- · Replies 2 ·
Graduate Is the Fabric of Spacetime a Physical Object?
- ShadowKnight
- · Replies 25 ·
High School Suggested Book Recommendations for High School Physics Project
- AFG34
- · Replies 4 ·
High School Civilizations in other galaxies?
- Holocene
- · Replies 6 ·
Graduate Cold Dark Matter: Bottom-Up vs. Top-Down Structure Formation
- blumfeld0
- · Replies 5 ·
Graduate Does vacuum energy rely on the existence of matter?
- diffusion
- · Replies 7 ·
Graduate What would a black dwarf be like?
- Meatbot
- · Replies 3 ·
High School Astronomy: Get Started with a Telescope Under £250
- RZero
- · Replies 1 ·
Graduate Solidifying space mirrors in space?
- RGClark
- · Replies 1 ·
Graduate Creating a Black Hole: Possible?
- J20gU3
- · Replies 45 ·
High School Why does planets hav eliptical orbits
- vivinisaac
- · Replies 2 ·
Action/reaction : if we do an action that requires energy of the whole universe
- dorohn
- · Replies 2 ·
Stargazing Can You Capture Colors on Consecutive Nights with a Telescope?
- russ_watters
- · Replies 4 ·
Graduate Solving Specific Intensity: A Beginner's Guide
- astronut
- · Replies 1 ·
Graduate Field of Eschatology pertaining to the binary star Wormwood
- Vericero
- · Replies 1 ·
Graduate Uncovering the Mysteries of the Universe: Big Bang Questions Answered
- Pavel
- · Replies 8 ·
Graduate Alternative to the big bang [new scientist]
- matthyaouw
- · Replies 5 ·
High School Planet & Moon Rotation: Questions Answered for 5th Grade Student
- Gary Hutton
- · Replies 1 ·
Undergrad Is Additional Speed Beyond Orbital Velocity Needed for Escape?
- menager31
- · Replies 3 ·
Graduate Is the Universe Really Flat Despite the Existence of Gravity?
- PhanthomJay
- · Replies 7 ·
Graduate Is the Universe Flat and What Does That Mean for Its Geometry?
- Holocene
- · Replies 1 ·
Undergrad Moon Stopping Velocity & Impact Force: How Long Would It Take?
- sskakam
- · Replies 18 ·
Graduate Gravitational Lensing and Frequency-Dependent Light Travel Time
- wolram
- · Replies 3 ·
High School Toys in Space: Designing for Astronauts
- DyslexicHobo
- · Replies 12 ·
Graduate Bojo in Nature Physics July issue, probing before bigbang with quantum cosmology
- marcus
- · Replies 35 ·
Undergrad What Causes Voids in the Expanding Universe?
- linda123
- · Replies 8 ·
Graduate How long would we live without the sun
- Alex Nesh
- · Replies 27 ·
Graduate Do Non-Rotating Neutron Stars Exist?
- cosmic_tears
- · Replies 15 ·
Graduate Trying to Understand Time Dilaton
- RJ Emery
- · Replies 2 ·
Comets Heading Towards Earth: True or False?
- kusha02
- · Replies 5 ·
Undergrad Problem with the theories about the Sun and the planets
- scogos.com
- · Replies 4 ·
Undergrad Why do some people deny the evidence for the Big Bang Theory?
- nicktacik
- · Replies 28 ·
Graduate What is the role of negative gravity in the Big Bang theory?
- TR345
- · Replies 1 ·
Graduate Is the Universe Drawn to a Cosmic Black Hole for a New Beginning?
- navid legoon
- · Replies 10 ·
Graduate What's Wrong with My Pet Theory of Cosmology?
- SeriousEngine
- · Replies 4 ·
Graduate QG Light Time Arrivals & Swiss Cheese Effect
- wolram
- · Replies 1 ·
Undergrad How does the moon's gravity affect the orbit of the ISS?
- PeterHarrison84
- · Replies 5 ·
Undergrad Is Primary Focus Magnification the Same as Focal Distance Equivalent in Optics?
- eletj
- · Replies 7 ·
Graduate Have some ideas looking for feedback
- BlinkRA182
- · Replies 2 ·
Stargazing I Am Cursed Ack Fi My New Telescope hates me
- Saladsamurai
- · Replies 63 ·
Graduate Sharper than Hubble, from the ground.
- mgb_phys
- · Replies 1 ·
Graduate Can Planets Be Entirely Liquid and Still Viable in Space?
- EnumaElish
- · Replies 6 ·
Graduate Are all lines through space also loops?
- redskies
- · Replies 10 ·
Only 1 hour to the Aurigids meteor shower (storm?)
- tony873004
- · Replies 4 ·
Where Can I Find a Map of Our Galaxy?
- The Bob
- · Replies 7 ·
Undergrad Background radiation and photons
- Theraven1982
- · Replies 6 ·
High School What Triggered the Big Bang and Created Our Universe?
- quantum123
- · Replies 4 ·
Graduate Modern Cosmology: Science or Folktale?
- quantum123
- · Replies 12 ·
Graduate Apparent contradiction with orbital mechanics
- ee78
- · Replies 7 ·
High School Say Hi to Space in 24 Hours: Hover in a Helicopter
- perfectz
- · Replies 7 ·
Graduate Can LQC explain the bounce of black holes?
- wolram
- · Replies 7 ·
Graduate Vacuum Energy and Dark Energy: Are They One and the Same?
- dilletante
- · Replies 1 ·
Stargazing Did You Know the Moon Dances for Us Every Month?
- Janus
- · Replies 4 ·
Stargazing Are You Prepared for the Upcoming Lunar Eclipse?
- Gokul43201
- · Replies 17 ·
High School Will Mars Really Look as Big as the Moon on August 27, 2007?
- HiggsBoson
- · Replies 11 ·
Undergrad Question: Mass distribution in galaxies
- grouchyone
- · Replies 3 ·
High School The Fascinating Truth About the Moon's Monthly Orbit Around the Earth
- Howers
- · Replies 3 ·
Graduate Hubble's Constant: Calculating Expansion Rate
- K.J.Healey
- · Replies 7 ·
Graduate Singularity (Wikipedia and Mathworld definitions)
- marcus
- · Replies 26 ·
High School The Universe - books for youngsters (?)
- KnockAr0und
- · Replies 2 ·
Graduate Hawking Radiation: Does an Astronaut Ever Cross the Horizon?
- Puffin
- · Replies 1 ·
Graduate The Sun's Final Form: Radius, Mass & Composition
- Helios
- · Replies 2 ·
Graduate What Causes Symbiotic Novae to Re-Explode?
- En_lizard
- · Replies 4 ·
Graduate Big Bang and absolute simultaneity
- loleater
- · Replies 6 ·
Graduate Could MAGIC IACT Reveal Insights into Quantum Gravity?
- marcus
- · Replies 1 ·
Graduate How do intense magnetic fields cause photons to split or merge?
- RJ Emery
- · Replies 2 ·
Graduate Observing the universe existing simultaneously with us
- incandescent
- · Replies 8 ·
Graduate Could a collision cause Venus to rotate prograde?
- Alex Nesh
- · Replies 2 ·
Graduate I've got an idea that i would like some help developing
- «John»
- · Replies 9 ·
Undergrad Who was Ralph Alpher and what impact did he have on the world of physics?
- robphy
- · Replies 2 ·
Stargazing Which Telescope Should I Buy for Astrophotography and Viewing?
- Saladsamurai
- · Replies 36 ·
Graduate Three video-talks on the CMB and structure of universe
- marcus
- · Replies 1 ·
Graduate Are we just a simulation? (Woit's message to the overlords: Dont turn us off)
- marcus
- · Replies 1 ·
Graduate Supermassive blackholes and galaxy formation.
- Benzoate
- · Replies 8 ·
Undergrad Number 47: Uncovering Universe's Basic Structure
- imranyusuf
- · Replies 3 ·