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
Undergrad Why isn't the Planck-scale limit taken as a postulate?
- Gerinski
- · Replies 8 ·
Stargazing M8 Lagoon and M20 Trifid nebulae
- davenn
- · Replies 1 ·
High School Our galaxy hosts millions of Black Holes
- wolram
- · Replies 12 ·
High School Can gravitational waves interfere with each other?
- KBon
- · Replies 30 ·
Undergrad Why centrifuges on Earth and in space would be the same?
- Cyber
- · Replies 8 ·
Undergrad Is the Planck length a proper length?
- jcap
- · Replies 6 ·
Stargazing Where's your favorite place to stargaze?
- PhotonSSBM
- · Replies 3 ·
Stargazing Amici roof prism erecting diagonal for ED80 telescope
- sophiecentaur
- · Replies 6 ·
Undergrad Finding Remnants of the Big Bang
- ErikC
- · Replies 2 ·
Stargazing Image of Galaxy M83 by Dave: July 2016
- davenn
- · Replies 4 ·
Undergrad Dark energy and conservation of energy
- DoobleD
- · Replies 20 ·
High School Would we be able to completely stop time?
- Tryannosaurus
- · Replies 5 ·
Undergrad How common is automation in Astronomy?
- Phys12
- · Replies 2 ·
Undergrad What did we know about stars in 1950?
- Octavianus
- · Replies 8 ·
High School Is there a unity across scale in the universe?
- Mazeikas
- · Replies 6 ·
Undergrad Exomoon candidate around Kepler-1625b with Neptune-sized moon
- mfb
- · Replies 8 ·
High School Can you park a ship between Earth and the moon for a year?
- tionis
- · Replies 10 ·
Undergrad Virgo joins the measurement of gravitational waves
- mfb
- · Replies 3 ·
High School Why don't galaxies obey gravity?
- Wallsy
- · Replies 36 ·
High School Picture of "very" blue galaxy, good place for super nova?
- Spinnor
- · Replies 11 ·
Undergrad Perlmutter presentation : pb on the age of the Universe
- DoobleD
- · Replies 3 ·
High School Does gravity distort light from distant galaxies on its way to Earth?
- Wallsy
- · Replies 26 ·
Graduate Conformal cyclic cosmology and noise in LIGO gravitational wave signals
- Auto-Didact
- · Replies 11 ·
High School How to debunk the idea we are the center of the universe
- Justonequestion
- · Replies 16 ·
High School Greenish-blue star-shaped light in San Diego night sky on August 1
- Perpetual Student
- · Replies 25 ·
High School Distance between two orbiting bodies
- Vicara
- · Replies 7 ·
Undergrad IOAA 2nd problems: universe expansion
- Petch Phumrapee
- · Replies 1 ·
High School How can light travel around an object in space?
- Timvanhoomissen
- · Replies 1 ·
Undergrad What's the Latest Research on Gravitational Lensing?
- Katia
- · Replies 1 ·
High School How to do the calculations showing the Universe is flat?
- Joshua P
- · Replies 52 ·
Undergrad Galaxies moving away at the speed of light?
- genphis
- · Replies 14 ·
High School Angular momentum, degeneracy pressure, and cosmic inflation
- stoomart
- · Replies 6 ·
High School Big Crunch, Big Bang and information loss
- BernieM
- · Replies 56 ·
Undergrad Proving equation for duration of transit
- Erenjaeger
- · Replies 12 ·
Stargazing Did I capture Pluto with a 400mm f/2.8 lens?
- Andy Resnick
- · Replies 10 ·
High School Does observation *Determine* the past?
- FallenApple
- · Replies 22 ·
High School Are pulsar beams perpendicular to their spin axis?
- megacal
- · Replies 2 ·
High School What is the Unit for Gas Giant Planets in Astrophysics?
- Erenjaeger
- · Replies 2 ·
High School Why are only hydrogen and helium created
- david2
- · Replies 4 ·
High School Fast Radio Burst Pinned Down to Giant Stellar Nursery
- CygnusX-1
- · Replies 9 ·
High School Do we exist within a singularity
- benjamin1889
- · Replies 24 ·
High School Why didn't the Universe end up in a huge black hole?
- Leonardo Muzzi
- · Replies 16 ·
Undergrad A copy of me in an infinite universe
- weezy
- · Replies 3 ·
Graduate Gravity as space-time curvature?
- Anthony DiGrazia
- · Replies 1 ·
Stargazing Can a Mobile Phone Capture the Beauty of the Night Sky?
- DennisN
- · Replies 5 ·
Undergrad No detection of gravitational radiation
- wolram
- · Replies 7 ·
Undergrad Planck length and space expansion/contraction
- jcap
- · Replies 1 ·
Undergrad Why is inflation initial patch length ~ 1 Hubble length ?
- DoobleD
- · Replies 2 ·
Undergrad Why the GUT epoch ended at ~10^-36 s ?
- DoobleD
- · Replies 6 ·
Stargazing Amateur telescope photos of Vega and Arcturus
- bruha
- · Replies 7 ·
Graduate Computer simulation of neutrino physics research
- Ram C
- · Replies 2 ·
Undergrad What does χ^-1 represent in inflationary expansion rate a(t) ~ e^χt?
- DoobleD
- · Replies 7 ·
Undergrad Quantum bits information lost in black holes
- arlesterc
- · Replies 12 ·
Graduate Angle between planet vector and Earth-Sun vector
- Philosophaie
- · Replies 1 ·
Undergrad Inflation lecture from Guth : why does d(ρ)/dt = 0 ?
- DoobleD
- · Replies 3 ·
Undergrad Calculation of daily solar insolation
- jones123
- · Replies 6 ·
Undergrad Are photons from the CMB being emitted from beyond our cosmological horizon?
- Timvanhoomissen
- · Replies 6 ·
High School Will Andromeda actually collide with the Milky Way?
- Suekdccia
- · Replies 21 ·
Undergrad Why is the CMB still detectable if it was emitted at recombination?
- Timvanhoomissen
- · Replies 9 ·
Undergrad Solar system simulation -- Significant deviation of some Jovian moons
- madsmh
- · Replies 2 ·
High School What Happens to Gases in Space and How Do They Behave?
- Anon5000
- · Replies 6 ·
Undergrad Why invariable plane is tilted to ecliptic plane?
- HelioGeo
- · Replies 8 ·
High School So why is space travel so hurdlesome again?
- Anon5000
- · Replies 6 ·
Undergrad Will an elliptical orbit self-correct into a circular one?
- Edward Barrow
- · Replies 18 ·
Undergrad Taking Projectile Motion to make Planetary Trajectories
- 10Exahertz
- · Replies 2 ·
Undergrad The particle horizon value is ignoring inflation?
- DoobleD
- · Replies 4 ·
Graduate Does Magnetic Braking Theory hold up?
- Gfellow
- · Replies 10 ·
Undergrad What is the C_l in the Fisher Matrix For An CMB Survey?
- xdrgnh
- · Replies 11 ·
High School Did Mass Exist in the Early Universe Before the Higgs Boson?
- Brunolem33
- · Replies 5 ·
Undergrad Extra energy needed to thrust perpendicular to orbital plane
- Albertgauss
- · Replies 5 ·
Graduate The Big Bang model only deals with the known universe - True or False?
- icantevenn
- · Replies 6 ·
Undergrad Stellar reddening via Av calculation
- bruha
- · Replies 1 ·
Stargazing Aurora likely visible in northern US on July 16-17
- jtbell
- · Replies 1 ·
High School Could dark matter and dark energy be the same thing?
- friend
- · Replies 7 ·
Undergrad Computer friendly list of bodies in the asteroid belt?
- madsmh
- · Replies 1 ·
High School Kepler's 3rd Law, geometric relationship?
- Mr Joe Bangles
- · Replies 6 ·
Undergrad Where is a planet's gravity maximum?
- rootone
- · Replies 3 ·
Undergrad Calculation of the hour angle of the Sun
- jones123
- · Replies 1 ·
High School Why can giant gas planets exceed 13 Jupiter masses without deuterium fusion?
- |Glitch|
- · Replies 31 ·
Undergrad Propagation of a light ray : Multiply or not by factor
- fab13
- · Replies 2 ·
Stargazing Is there a solution for auto-guiding issues with a Celestron CGEM telescope?
- NFuller
- · Replies 2 ·
Undergrad The Big Bang: Exploding the Myth of a Center in Space and Time
- Kristoffer
- · Replies 2 ·
Undergrad What was the universe made of at the beginning, and how did matter arise?
- Mr Davis 97
- · Replies 9 ·
Undergrad Do stars have any lower mass limit?
- Sid
- · Replies 8 ·
Undergrad Observing Orbital Speed of stars within Galaxies
- Strange design
- · Replies 7 ·
Undergrad Equilibrium chaotic environment
- durant35
- · Replies 2 ·
High School Could another Earth-like planet exist near us in our solar system?
- momo666
- · Replies 20 ·
Graduate How Does the Stiffness of Supernova EOS Change with Various Parameters?
- silly_sheep
- · Replies 2 ·
High School Do black holes radiate antimatter?
- friend
- · Replies 35 ·
Graduate Reproducing massive gravity parameter values from arXiv:1205.1613
- xdrgnh
- · Replies 1 ·
Graduate Fisher matrix elements too large for EUCLID survey constraints
- xdrgnh
- · Replies 10 ·
High School Inclinations of star orbits in the Milky Way
- VladZH
- · Replies 4 ·
Undergrad Calculating precession rate change from binary system formula
- phi
- · Replies 2 ·
High School What Are the Orbiting Objects Around Luhman 16AB Called?
- |Glitch|
- · Replies 6 ·
High School Could the initial Big Bang force appear as dark energy as gravity weakens?
- Inderjeet Singh
- · Replies 4 ·
High School Sidereal Time and the Arctic Circle
- MrsTesla
- · Replies 2 ·
Graduate Neutron star mass-radius relation plot
- silly_sheep
- · Replies 3 ·
High School How many planets can we estimate in other galaxies?
- davidge
- · Replies 4 ·
Undergrad Measuring distance to a galaxy using natural H20 laser
- Buzz Bloom
- · Replies 2 ·
High School Effect of the Sun's Gravity on the Moon
- Deepak K Kapur
- · Replies 11 ·