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 Are Galaxies Moving Faster Than Light Due to Space Expansion?
- user9003
- · Replies 33 ·
Undergrad Light and our atmosphere (some quantum physics)
- victorhugo
- · Replies 1 ·
Undergrad What does "expansion of the universe" mean?
- MeJennifer
- · Replies 37 ·
Undergrad Time translation symmetry and the Big Bang
- Robin04
- · Replies 7 ·
Graduate Transition from opaque universe to release of CMB
- Bill McKeeman
- · Replies 1 ·
High School What exactly is L, Lz and E in orbital mechanics?
- Stollaxel Stoll
- · Replies 3 ·
Undergrad Are Exotic Leptons Crucial for Life's Existence?
- windy miller
- · Replies 3 ·
Stargazing Deep Space Imaging and stacking images for less noise
- davenn
- · Replies 39 ·
High School What causes the cosmic microwave background temperature of 2.7 Kelvin?
- Stephanus
- · Replies 13 ·
High School Is dark matter a sea of massive photons?
- BobbyHurley
- · Replies 17 ·
High School Is the Variable Speed of Light Theory a Viable Alternative to Inflation?
- Einstein's Cat
- · Replies 8 ·
Undergrad Detecting Entanglement in the Inflationary Potential: Is it Possible?
- Markus Hanke
- · Replies 1 ·
High School The universe is crowded with black holes
- wolram
- · Replies 3 ·
Undergrad Dark Matter: Can Gravitational Field Be Generated?
- Lorenzo Mambretti
- · Replies 3 ·
High School Could quasars generate energy from fusion?
- Miguel de Luis
- · Replies 3 ·
Insights Where Did the Big Bang Happen? - Comments
- Multiple_Authors
- · Replies 2 ·
Undergrad Why do we need "planetary equilibrium temperature"?
- GW150914
- · Replies 5 ·
High School Why do two orbiting bodies orbit their center of mass?
- Biker
- · Replies 11 ·
High School Is There a Limit to How Much Light Can Be Stretched Out in a Black Hole?
- Borrah Campbell
- · Replies 8 ·
Undergrad Youtube video about the sound of a pulsar
- Garlic
- · Replies 3 ·
High School Could the universe's Big Bang be 1D?
- scimeister
- · Replies 7 ·
Stargazing Is There More Than One Universe?
- elhumanoid
- · Replies 1 ·
High School Could LIGO Have Detected Dark Matter?
- wolram
- · Replies 13 ·
Graduate Charged black holes and charge balance in galaxies
- Keith12345
- · Replies 2 ·
Undergrad The Infinity of Days in the Eternity Universe
- thinkandmull
- · Replies 2 ·
Stargazing The terrible distortions of the Hubble Telescope
- oz93666
- · Replies 51 ·
Undergrad Is the total amount of gravity in the Universe conserved?
- a dull boy
- · Replies 9 ·
Undergrad What are the Different Types of Multiverse Theories in Cosmology?
- Schnellmann
- · Replies 4 ·
High School Sgr A Relativistic Jets Visible?
- D English
- · Replies 3 ·
Undergrad Dark Energy - something from nothing?
- Schnellmann
- · Replies 11 ·
Undergrad Does Black Hole Evaporation Violate the Second Law of Thermodynamics?
- Einstein's Cat
- · Replies 1 ·
Undergrad Astronomical improvements needed to detect exomoons around Earth-size planets
- Buzz Bloom
- · Replies 5 ·
High School Why do stars experience gravity more than its mass?
- AshUchiha
- · Replies 30 ·
Undergrad Quantum Kinetic Energy of Neutrons, Protons and Electrons
- gennarakis
- · Replies 5 ·
High School Why does the sun expand and heat up as it ages?
- stevendaryl
- · Replies 6 ·
High School Why does Hubble's law hold?
- Einstein's Cat
- · Replies 4 ·
High School Expected density of black holes in the nearby universe
- wolram
- · Replies 1 ·
Undergrad Remote observer sees black hole evaporate
- phinds
- · Replies 20 ·
High School LIGO detects second gravity waves
- elusiveshame
- · Replies 3 ·
Graduate Systematic comparison of cosmological models against CMB and supernova data
- Vincentius
- · Replies 10 ·
Undergrad Why are spacecraft launches usually terminated at perigee or apogee?
- jose medina pedraza
- · Replies 11 ·
Graduate Stellar photosphere temperatures
- astrotizio
- · Replies 7 ·
Undergrad How can the universe expand faster than light?
- A AM ARYA
- · Replies 59 ·
Undergrad How Do You Convert Parsecs to Arcminutes in Astrophysics?
- mmont012
- · Replies 7 ·
Stargazing Cleaning dust and condensation from an 8-inch Dobsonian
- sophiecentaur
- · Replies 7 ·
High School Cosmological data margins of error
- Clever Penguin
- · Replies 1 ·
High School Is the universe expanding faster than expected
- wolram
- · Replies 7 ·
Undergrad Why are planets colder at the poles than the equator?
- Liam A
- · Replies 6 ·
What does Astrophysics/Astronomy mean to you?
- Mariam Abalo-Toga
- · Replies 3 ·
High School What Happens to the Singularity Inside a Black Hole When It Evaporates?
- Rishi Tharun
- · Replies 3 ·
Undergrad Different densities of the universe on different angles?
- KingSnackMan
- · Replies 9 ·
High School Does space really expand, or is it just pedagogical shorthand?
- wolram
- · Replies 11 ·
Undergrad Could Brown Dwarf Sub-Dwarf Companions Host Habitable Moons?
- |Glitch|
- · Replies 6 ·
High School Infinite multiverse would contain the ridiculous?
- Andrew Wright
- · Replies 55 ·
High School Zero degrees longitude on other planets
- Zamedy
- · Replies 7 ·
Stargazing Can you me with this Hershel telescope beam?
- sonutabitha
- · Replies 5 ·
Stargazing Black image through Newtonian reflector eyepiece despite working viewfinder
- George Barry
- · Replies 4 ·
Undergrad Supernova rate in the Milky Way: which option is closest?
- Erenjaeger
- · Replies 6 ·
High School Calculating distances with an elliptical orbit
- iLoveBigData
- · Replies 1 ·
Undergrad What is the size of the observable universe relative to CMBR
- PeterPendragon
- · Replies 10 ·
Graduate Trapping the sun in a perfect insulator
- serp777
- · Replies 16 ·
High School Is space itself expanding or just distances between galaxies growing?
- rede96
- · Replies 87 ·
High School What is the maximum lifespan of a B-class blue giant star?
- SF Alba
- · Replies 4 ·
Graduate How far can I see a star with naked eyes on a clear night?
- WallyTheInept
- · Replies 16 ·
Undergrad Calculating semi-major axis and minimum mass of an exoplanet
- Mauro Montemayor
- · Replies 1 ·
High School What is the reason for galaxies fading in the distant future?
- Einstein's Cat
- · Replies 38 ·
High School Kepler's Laws of planetary motion
- Erenjaeger
- · Replies 4 ·
High School What Is the Nature of Space and Its Infinite Possibilities?
- PeterPendragon
- · Replies 12 ·
High School Universe is accelerating expanding
- Physics_Kid
- · Replies 12 ·
Undergrad What Does MUV Mean in Astronomy? Understanding GN-z11 and its Redshift
- Phys12
- · Replies 6 ·
High School Could Dark Matter be Time itself?
- ricardo81
- · Replies 3 ·
Undergrad How does mars have a magnetic field, with a cooled core?
- Ethan Howell
- · Replies 10 ·
High School How do we know we are not inside a blackhole?
- marcelhattingh
- · Replies 6 ·
Undergrad The "real" reason why some galaxies are flat
- Afterthought
- · Replies 7 ·
Undergrad How Many Einstein Rings Have Been Discovered?
- wolram
- · Replies 2 ·
High School Data on time for fading of galaxy?
- Einstein's Cat
- · Replies 29 ·
Graduate The equation of state of non-relativistic energy
- Joey21
- · Replies 3 ·
High School What Are Love Numbers and How Do They Impact Tidal Deformations?
- Hoophy
- · Replies 6 ·
High School Jupiter Red Spot Position and more
- Omega0
- · Replies 1 ·
Undergrad Light speed moving objects -- What would it look like?
- Gassine
- · Replies 9 ·
Undergrad Is the Oort Cloud Just Speculation or a Real Cosmic Structure?
- rootone
- · Replies 6 ·
Undergrad Superconductors and spacetime question
- Billy Maxwell
- · Replies 4 ·
Undergrad Hubble finds universe may be expanding faster than expected
- |Glitch|
- · Replies 1 ·
High School Equatorial platform: any experiences?
- sophiecentaur
- · Replies 4 ·
High School Dipole pattern for Fine Structure Constant?
- mikenw
- · Replies 9 ·
High School Does the moon rotate on its axis?
- lw1990
- · Replies 7 ·
High School Are the axes of celestial objects parallel in a galaxy?
- lw1990
- · Replies 3 ·
High School Are Larger Black Holes Less Dense Than Smaller Ones?
- Will Langas
- · Replies 3 ·
Graduate Life forms that live in decreasing entropy phase of universe
- Ito
- · Replies 2 ·
High School Does Kurzgesagt correctly explain galaxy group formation?
- PrincePhoenix
- · Replies 5 ·
Undergrad How does the solar wind affect Earth's atmosphere?
- PaperAirplane
- · Replies 3 ·
Undergrad Does tidal power generation slowly degrade the moon's orbit?
- Simoyd
- · Replies 5 ·
Undergrad Why are physicists who discovered gravity phenomena the most famous?
- ricky33
- · Replies 2 ·
Stargazing What is the difference between a type IIP and type IIL supernova?
- davenn
- · Replies 3 ·
Undergrad GW150914 and GW150914-GBM revisited
- Chronos
- · Replies 1 ·
High School Can a deterministic universe contain a being that predicts its own future?
- raphalbatros
- · Replies 3 ·
Graduate What is the significance of peculiar motion in galactic rotation data analysis?
- Bill McKeeman
- · Replies 3 ·
Stargazing A new and improved Eta Carina image
- davenn
- · Replies 5 ·
High School Expansion of space and momentums of galaxies
- Buckethead
- · Replies 14 ·
Undergrad Is tangential velocity in elliptical orbits stable?
- Andreas C
- · Replies 27 ·