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 Time Lapse of Supernova SN1987A - 30 Years in Under a Minute
- BillTre
- · Replies 5 ·
High School High School video project: What is Gravitational Lensing?
- Xander Jake
- · Replies 1 ·
High School What do astronomers think caused the Wow! signal?
- lifeonmercury
- · Replies 23 ·
Undergrad How to deal with the celestial meridian?
- Heatherfield
- · Replies 1 ·
Undergrad Dark Matter Size to be seen in our solar system
- Albertgauss
- · Replies 5 ·
High School What defines planetary core, mantle and crust?
- swampwiz
- · Replies 5 ·
Undergrad Finding parameters for equation 1 in JGRA.50543 for 100-300 km satellite height
- Sokos90
- · Replies 4 ·
High School We have kittens in orbit around Saturn
- Noisy Rhysling
- · Replies 3 ·
High School Where Can I Find the RA and Dec of the V1 Star?
- Curious Kid
- · Replies 6 ·
High School Black holes in the centres of galaxies
- davidge
- · Replies 27 ·
Cassini's Grand Finale - Fascinating New Insight
- Stavros Kiri
- · Replies 49 ·
Stargazing How Does Gravitational Lensing Work?
- Soundariya Raja
- · Replies 13 ·
High School What are the mystery lights in the sky and how can you identify them?
- jedishrfu
- · Replies 4 ·
High School Does the Singularity Really Exist Beyond the Standard Model?
- wolram
- · Replies 6 ·
High School A terrestrial, temperate planet around Proxima Centauri
- Ygggdrasil
- · Replies 60 ·
Undergrad What spatial scales does dark matter become significant?
- Albertgauss
- · Replies 3 ·
High School Is there a way to prove that men have gone to the moon
- Tio Barnabe
- · Replies 23 ·
High School Understanding Black Body Radiation and the Sun's Color Temperature
- riz
- · Replies 2 ·
Stargazing Stunning 2017 Eclipse Photos of the Corona Chromosphere
- Chronos
- · Replies 68 ·
High School The Most Primitive Star-Forming Galaxy Ever Found
- CygnusX-1
- · Replies 2 ·
Undergrad Expanding universe and quantum wavefunctions
- durant35
- · Replies 11 ·
Stargazing Child-like pleasure in seeing ISS and detached Dragon capsule
- UsableThought
- · Replies 7 ·
High School Could we shade the Earth from the Sun to save Earth?
- Bmaxwell
- · Replies 26 ·
Undergrad Did Phase Transitions Drive Inflation in the Early Universe?
- Vrbic
- · Replies 9 ·
Undergrad T-symmetry and WDWE with regards to a Universe from Nothing
- zeroace
- · Replies 7 ·
High School How does the earth's magnetic field stop radiation?
- Lunct
- · Replies 24 ·
Undergrad What is the best source for COBE/WMAP/PLANCK mission data on the early universe?
- RJLiberator
- · Replies 2 ·
High School Planetary rings, moons, and asteroid belts for a habitable world
- Shawn Landau
- · Replies 7 ·
Graduate Galaxy rotation curves without dark matter using baryonic matter
- Adrian59
- · Replies 1 ·
High School Can Optical Interferometers Extend Beyond 1 Light Second in Length?
- smartalek86
- · Replies 1 ·
Graduate Press Schechter function -- the variance on mass scale
- classy cal
- · Replies 1 ·
High School How often do stars collide in galaxies?
- davidge
- · Replies 14 ·
High School What do you think of the new names for features on Pluto
- wolram
- · Replies 2 ·
Stargazing Worth it to buy 2" eyepieces for Newtonian telescope?
- lomidrevo
- · Replies 27 ·
High School Can an 18-inch telescope resolve an Earth-like exoplanet?
- kolleamm
- · Replies 6 ·
Stargazing Space debris threat to Hubble and other satellites
- UsableThought
- · Replies 1 ·
Undergrad Questions about planetary magnetic fields
- Hawksteinman
- · Replies 11 ·
Undergrad Event Horizon and the Mass of a Black Hole
- Arman777
- · Replies 12 ·
Undergrad What causes pressure in White Dwarfs and Neutron Stars?
- Ethan Singer
- · Replies 4 ·
Graduate Is the Parenago Discontinuity a real thing?
- DrBwts
- · Replies 7 ·
Undergrad Safe distance from a neutron star
- Blue Shift 2112
- · Replies 4 ·
Undergrad Meaning of permeability in free space
- TheCanadian
- · Replies 10 ·
Undergrad Dark matter/energy, why must it be there?
- Pedro Batista
- · Replies 30 ·
Undergrad Is the speed of gravitational waves non- dispersive?
- shadishacker
- · Replies 1 ·
Undergrad Why are the planets revolving around their own axis?
- Neolight
- · Replies 21 ·
High School Does gravity self interact with itself
- wolram
- · Replies 7 ·
Undergrad What would rainbows look like in a binary star system?
- stefan r
- · Replies 1 ·
High School Does this paper disprove the possibility of a new universe creation?
- Yid
- · Replies 3 ·
Stargazing Aurora Alert for 6th and 7th Sept
- davenn
- · Replies 6 ·
High School Does expanding spacetime affect how gravity propagates?
- Chris Miller
- · Replies 87 ·
High School Did expansion start from a finite seed or happen everywhere at once?
- Grinkle
- · Replies 9 ·
Undergrad Virial Theorem and the Ergodic hypothesis
- JMatt7
- · Replies 2 ·
High School How can the Big Bang model apply to the entire universe?
- icantevenn
- · Replies 21 ·
Undergrad Comparison of tidal forces acting on the Moon vs Enceladus
- Vrbic
- · Replies 56 ·
High School Uranus's Moon Cressida is Doomed
- CygnusX-1
- · Replies 5 ·
Stargazing Sunspots visible for 2 Sept 2017
- davenn
- · Replies 13 ·
High School Why does the Moon sometimes seem red?
- Eleni_
- · Replies 9 ·
High School What Theories Explain the Nature and Changes of Space?
- sanpokhrel
- · Replies 1 ·
High School See Asteroid Florence Tonight in Frankfurt Germany
- lifeonmercury
- · Replies 2 ·
Undergrad What is the actual distance when integrating a(t)*dr in an expanding universe?
- Apashanka Das
- · Replies 2 ·
Undergrad Ammonia in icy moons of gas giants
- smartalek86
- · Replies 2 ·
High School Big Bang theory and the known universe
- icantevenn
- · Replies 29 ·
Undergrad Models of accretion disc emissions contradicted by experiment
- Buzz Bloom
- · Replies 5 ·
High School What is the age of the universe relative to?
- Salvador Sosa
- · Replies 8 ·
High School A Hypothesis To Observe The Formation Of Earth
- asesena
- · Replies 12 ·
High School Did the big bang create something from nothing?
- Lunct
- · Replies 26 ·
High School Is Our Observable Universe the Actual Size of Our Universe?
- Lunct
- · Replies 18 ·
High School Most detailed picture of Antares
- mfb
- · Replies 8 ·
High School What factors determine the timing of a solar eclipse?
- arabianights
- · Replies 3 ·
High School Asteroid Florence will soon pass Earth
- tony873004
- · Replies 1 ·
Stargazing The Sun today - 9 July 2017 - nice spot group
- davenn
- · Replies 37 ·
High School Why Didn't the Earth Go Dark During Today's Solar Eclipse?
- rasp
- · Replies 21 ·
Stargazing 'losing light' 1.25" DSLR coupling vs 2"?
- mishima
- · Replies 5 ·
Graduate Definition of [itex]\sigma_8[/itex]
- Einj
- · Replies 5 ·
Undergrad Why not detect dark matter in our own galaxy?
- alejandromeira
- · Replies 12 ·
Stargazing 2 significant spot groups currently visible
- davenn
- · Replies 10 ·
High School Are Gravitational Waves accepted?
- nmsurobert
- · Replies 3 ·
High School Is it possible to see sunspots with the unaided eye?
- BenAS
- · Replies 15 ·
High School If spacetime can be bent can it be broken?
- Wallsy
- · Replies 14 ·
Undergrad How much of inner galaxy rotation curves is due to mass enclosed?
- redtree
- · Replies 19 ·
Undergrad Observable Universe Size in Different Perspectives
- Arman777
- · Replies 42 ·
Stargazing Cloud of ~1000 twinkling stars moving near Jupiter on Feb 20
- tonyxon22
- · Replies 32 ·
Stargazing Solar Con? Eclipse road trip to Makanda Illinois
- Blank_Stare
- · Replies 40 ·
Undergrad Why does the eclipse path curve and shift with Earth's tilt and the moon's orbit?
- TheWonderer1
- · Replies 7 ·
High School Does the 14 billion year age refer to the observable universe or entire universe?
- Oink Honey
- · Replies 56 ·
Stargazing Protecting Optics (not eyes) During Solar Observing
- mishima
- · Replies 20 ·
Undergrad Hawking radiation from de Sitter horizon
- durant35
- · Replies 8 ·
High School What if we weren't the only Big Bang
- clockwork_fox12
- · Replies 3 ·
High School Capture in a 2-body system (not)
- DaveC426913
- · Replies 2 ·
Stargazing Welding glasses safe to view eclipse with?
- dotancohen
- · Replies 13 ·
Undergrad How to model Solar System formation accurately and realistically
- Joshua Benabou
- · Replies 6 ·
High School Why didn't matter form a uniform expanding sphere after the Big Bang?
- Pgottsha84
- · Replies 8 ·
Graduate GADGET2 Simulations: Fixing N-GenIC Error
- Plaetean
- · Replies 3 ·
High School Goldilocks zones of other parameters
- Suppaman
- · Replies 13 ·
Undergrad Influence of Dark Energy and curvature in photon-baryon fluid?
- DoobleD
- · Replies 4 ·
High School A thought on the expansion of the Universe
- Igottaknow
- · Replies 2 ·
Undergrad How fast is the Universe expanding?
- hugostrange
- · Replies 16 ·
Stargazing Different Simultaneity for telescopes in space and earth?
- ofirg
- · Replies 2 ·
Undergrad Could fragmented moon debris bombard Earth for thousands of years?
- Sherwood Botsford
- · Replies 9 ·
Undergrad Why isn't the Planck-scale limit taken as a postulate?
- Gerinski
- · Replies 8 ·