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
Graduate CRIRES (VLT) Radial Velocity Sensitivity
- natski
- · Replies 2 ·
Graduate Is There an Exact Equation for Transit Time Calculation in Extrasolar Planets?
- natski
- · Replies 9 ·
Undergrad How does gravitational force relate to energy in orbital motion?
- d_jnaneswar
- · Replies 21 ·
Graduate Can Dark Energy Be Tested in a Lab Using Superconductors?
- cristo
- · Replies 3 ·
Stargazing Why does my homemade telescope magnify only 2 times instead of 10?
- gdpudasaini
- · Replies 3 ·
Graduate Parallel universes make quantum sense?
- Devilin
- · Replies 39 ·
Undergrad What forces keep the universe flat?
- Levi Porter
- · Replies 9 ·
Graduate Using the second law of thermodynamics to explain the universe's ultimate fate
- gdpudasaini
- · Replies 7 ·
Graduate Lunar Space Elevator: Is a Rocketless Trip Possible?
- BosonJaw
- · Replies 3 ·
Graduate Could we redirect a comet to another star system for colonization?
- bikeaddict
- · Replies 10 ·
Stargazing Should I buy the Meade 2114 GoTo or a Celestron under $150?
- whalemangler
- · Replies 6 ·
Undergrad The Earthly Risk of Rogue Black Holes
- hammertime
- · Replies 1 ·
Graduate Could the big bang be a white hole?
- Jonny_trigonometry
- · Replies 3 ·
High School Telescope lenses fogging up in humid Louisiana weather
- kurushio95
- · Replies 10 ·
NASA Resurrects Mission to Visit Asteroids in 2007
- MonstersFromTheId
- · Replies 6 ·
Undergrad What is the Role of Plasma in Solar Flares?
- pivoxa15
- · Replies 3 ·
Graduate Uniqueness of Bojowald's Bounce in the Multiverse
- hurk4
- · Replies 6 ·
Undergrad What is the significance of inverse meters in astronomy calculations?
- velvetymoogle
- · Replies 3 ·
Graduate What is the many-worlds interpretation of quantum mechanics?
- qspeechc
- · Replies 103 ·
High School Traveling at c, how long to the edge of the solar system from earth?
- Mackay1011
- · Replies 3 ·
Undergrad How Have Advances in Cosmology Progressed Since Einstein?
- wolram
- · Replies 3 ·
Graduate Supernova Distance Debate: New Evidence from Astrophysics Research by H. Arp"
- wolram
- · Replies 2 ·
Graduate Our skewed perception of galaxies
- Veritas2
- · Replies 8 ·
High School Maximum wavelength of M101 visible to the naked eye
- menager31
- · Replies 2 ·
Undergrad Could we heat a planet from within to make it habitable?
- 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 How often do supernovae occur in our galaxy and could they harm Earth?
- 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 What did Oxford scientists actually find about parallel universes?
- 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 What is quantum gravity?
- sruthisupriya
- · Replies 1 ·
Graduate How do QG people evolve particles into the theory?
- wolram
- · Replies 2 ·
High School How long can you observe a comet for during 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 ·
Can video feedback loops show black holes and dark matter?
- 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 Can vacuum energy exist without any matter in the universe?
- 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 Can we create a black hole by making a massive star?
- 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 What does specific intensity mean physically?
- astronut
- · Replies 1 ·
Graduate Field of Eschatology pertaining to the binary star Wormwood
- Vericero
- · Replies 1 ·
Graduate How did the universe reach 156 billion light years across?
- Pavel
- · Replies 8 ·
Graduate Alternative to the big bang [new scientist]
- matthyaouw
- · Replies 5 ·
High School Do all planets rotate like Earth?
- Gary Hutton
- · Replies 1 ·
Undergrad Is Additional Speed Beyond Orbital Velocity Needed for Escape?
- menager31
- · Replies 3 ·
Graduate How can the universe be flat if gravity curves spacetime?
- PhanthomJay
- · Replies 7 ·
Graduate How flat is the universe and what does flatness mean for 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 for astronauts in microgravity or low-g environments
- 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 What additional evidence supports the Big Bang theory beyond Hubble's law and the CMB?
- 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 Will the Swiss cheese effect muddy quantum gravity light time arrivals?
- 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 geodesics in curved spacetime always closed 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 rests on too few independent observations
- quantum123
- · Replies 12 ·
Graduate Apparent contradiction with orbital mechanics
- ee78
- · Replies 7 ·
High School Can hovering in a helicopter for 24 hours reach space due to Earth's rotation?
- 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 ·