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 Gyroscope levitation by spinning rings: is this a real experiment?
- TalonD
- · Replies 2 ·
Undergrad Peculiar vs. Irregular galaxies? Difference?
- Breedlove
- · Replies 1 ·
Undergrad How to Calculate Distances and Luminosities of Stars?
- C.E
- · Replies 1 ·
Graduate Nothingness and the rise of something
- litewave
- · Replies 24 ·
Undergrad Was that end of theoretical physics?
- pavi_elex
- · Replies 1 ·
Graduate How are the percentage contents of the universe calculated?
- Chronothread
- · Replies 3 ·
Graduate Why black holes do not have color charge?
- MTd2
- · Replies 12 ·
Graduate Do any singularities have Infinite density
- jamesb-uk
- · Replies 10 ·
Undergrad Why doesn't expanding light from a star get dimmer as its radius increases?
- vorcil
- · Replies 16 ·
Graduate The Hubble Constant and the Expansion of the Universe
- madness
- · Replies 1 ·
Graduate How far can we explore beyond Himiko before extending the age of the universe?
- wolram
- · Replies 1 ·
Graduate How do astronomers measure galaxy masses and what causes galaxy shapes?
- C.E
- · Replies 2 ·
Graduate What Is the Observable Universe's Center and Expansion?
- trisss
- · Replies 28 ·
High School Why Is the Earth Slowing Down?
- Cyrus80772
- · Replies 1 ·
Graduate Is Space Really Falling Faster Than Light Near a Black Hole?
- jobyts
- · Replies 3 ·
High School Photos of the our milky way galaxy
- yalgaar
- · Replies 5 ·
Graduate Is the Age of the Universe Relative and What is the CMB Speed Measured Against?
- kuahji
- · Replies 9 ·
Graduate What Drives the Expansion of the Universe?
- Peter Watkins
- · Replies 7 ·
High School Spin of planets, bigger means faster?
- valdar
- · Replies 7 ·
Graduate Does time exist for cosmologists?
- oldman
- · Replies 3 ·
Graduate When is a Principle not a Principle?
- oldman
- · Replies 4 ·
High School Can you see the shadow of a satellite?
- learningisfun
- · Replies 2 ·
Graduate CMB Anisotropy: Measuring Our Motion Through Space
- bwana
- · Replies 2 ·
Graduate What Does 'Quake Confinement' Mean in Astrophysics?
- vette982
- · Replies 2 ·
Graduate Wormholes and time travel - Problem
- valdar
- · Replies 4 ·
Graduate What is Causing The Universal Expansion?
- Stratosphere
- · Replies 10 ·
High School How do astronauts communicate with Earth during space missions?
- yalgaar
- · Replies 4 ·
Galaxy's centre tastes of raspberries and smells of rum
- mgb_phys
- · Replies 1 ·
Graduate CMB Redshift Question (Visible Wavelengths)
- Capler
- · Replies 2 ·
Graduate Why is cosmic expansion attributed to space itself rather than ballistic motion?
- Peter Watkins
- · Replies 96 ·
Undergrad How to Calculate Inclination Angle for Galaxies in the Tully-Fischer Relation
- Snowdeity
- · Replies 1 ·
High School Suggest topics for a 1-sem HS Astronomy course
- ks_physicist
- · Replies 3 ·
High School How does the Satellite manage to stay in earth's orbit?
- yalgaar
- · Replies 5 ·
Stargazing Telescope under $400 for Messier objects and galaxies
- wil3
- · Replies 15 ·
Undergrad Age of the sun+age of previous stars = universe ?
- curiousOne
- · Replies 6 ·
High School Looking at center of our galaxcy question.
- Cyrus80772
- · Replies 1 ·
Graduate Is spacetime truly flat without gravitational influences?
- Mr. Paradox
- · Replies 4 ·
Graduate How Does Magnetism Influence Black Holes Despite Escape Velocity Challenges?
- Maplesyrup
- · Replies 7 ·
High School How do you plot elliptical orbits for planets?
- Stratosphere
- · Replies 1 ·
Graduate What is the time dependence of the Omegas?
- Amanheis
- · Replies 8 ·
Graduate Could a Black Hole Explode Like the Big Bang?
- JimboLittle
- · Replies 2 ·
High School Why do planets orbit in ellipses?
- NWH
- · Replies 27 ·
Graduate Is spacetime the surface of a 5 dimensional ball.
- Spinnor
- · Replies 3 ·
Undergrad Why do atmospheric turbulent cells affect telescopes differently by size?
- skiboka33
- · Replies 2 ·
Graduate Can dark matter be trans-Seaborg elements?
- squidsoft
- · Replies 3 ·
Undergrad Can someone explain angular power spectrum
- hadoque
- · Replies 2 ·
Graduate What do you think about the Cosmic String theory?
- klite
- · Replies 3 ·
High School Which is Better for Stargazing: Sea Level or High Elevation?
- sderamus
- · Replies 1 ·
High School Can we travel back and forward in space?
- mathfigure
- · Replies 6 ·
Undergrad Resources for learning about the M-sigma relationship
- jeebs
- · Replies 2 ·
Graduate Lyman-Alpha Blobs emit very specific UV light
- thenewmans
- · Replies 3 ·
Undergrad What would we need for a warp drive?
- klite
- · Replies 9 ·
Graduate Measuring the Expansion of space
- robousy
- · Replies 19 ·
Undergrad Calculating time based on solar position
- fyzle
- · Replies 1 ·
Undergrad Is 10 Arc Seconds Accurate Enough for Sending Objects to the Moon?
- Solistics
- · Replies 1 ·
Graduate Radius of a finite hyperspherical universe with Ω = 1.02 and Λ
- qraal
- · Replies 14 ·
Undergrad Black Hole Brief: Seeking Feedback
- PeterToft
- · Replies 3 ·
High School Why do tides form on opposite sides of Earth?
- chmate
- · Replies 39 ·
Graduate Does black holes exist all around us?
- wavingerwin
- · Replies 4 ·
Graduate What density does something have to have to be considered a black hole?
- klite
- · Replies 1 ·
Graduate Is Chaos a Property of Time Since the Big Bang?
- aaryan0077
- · Replies 2 ·
The universe where McCain got elected.
- SpaceGuy50
- · Replies 24 ·
High School Lightning in Space: Fact or Fiction?
- muser
- · Replies 3 ·
Graduate Getting vectors out of JPL Horizons
- DiamondGeezer
- · Replies 9 ·
High School Looking for the Virgo constellation
- orthovector
- · Replies 20 ·
Undergrad What Are Orbital Vectors and How Do I Calculate Them?
- Solistics
- · Replies 10 ·
Graduate How do you work out the largest angular scale to which it is sensitive
- Tomboland
- · Replies 2 ·
High School Why is the dust tail of a comet a tail?
- edoarad
- · Replies 4 ·
Is It Possible To View The Milky Way In The UK
- samspade
- · Replies 1 ·
Undergrad Wormholes for Dummies Question .
- Djrob99
- · Replies 22 ·
Local Group Center: Direction of Center
- Pjpic
- · Replies 3 ·
Undergrad What Happens If a Spaceship Exceeds the Speed of Light?
- Mr. Paradox
- · Replies 4 ·
Graduate Why should the expansion of the universe be slowing down?
- edoarad
- · Replies 19 ·
Graduate Plotting emission spectra from HITRAN database intensity data
- nordmoon
- · Replies 1 ·
Graduate Could a superstrong chamber sustain a miniature star with constant fuel input?
- Mr. Paradox
- · Replies 9 ·
Graduate What is a Graviton? Reconciling Gravity and Quantum
- TalonD
- · Replies 10 ·
High School Making The Best of Light Polluted Skys
- Stratosphere
- · Replies 3 ·
Graduate How do solar neutrinos interact with nuclei to create radioactive elements?
- Wantstolearn
- · Replies 2 ·
Have you ever seen a UFO, alien or unusual cosmic object?
- Malexoin
- · Replies 9 ·
Undergrad Calculating Delta-V in Hohmann Transfer Equation
- Solistics
- · Replies 2 ·
Undergrad Why is the center of the galaxy located on the elliptic?
- Pjpic
- · Replies 2 ·
Graduate Is Zero Point Energy a Fundamental Part of the Material Universe?
- redhedkangaro
- · Replies 2 ·
Graduate Is the zero point energy field another name for the vacuum?
- redhedkangaro
- · Replies 3 ·
Graduate Questions about black holes for a fictional story
- Ryan Fenton
- · Replies 7 ·
Graduate Questions about the origin of the universe
- kasse
- · Replies 94 ·
Graduate Can the Universe Keep Dividing into Smaller Clumps of Matter?
- lubuntu
- · Replies 25 ·
Graduate Expanding universe and solar system
- Dmitry67
- · Replies 2 ·
Graduate Where Does the Energy of Redshifted Light Go?
- JuanCasado
- · Replies 47 ·
Graduate Is the Expansion of the Universe Linked to Our Perception of Time?
- steven_red
- · Replies 13 ·
Undergrad Stationary satellite in high latitude
- pixel01
- · Replies 5 ·
Undergrad How does Earth's orbit stay constant if the universe is expanding?
- mazen_zone
- · Replies 12 ·
Undergrad Star Catalogue Question - Stars near the Ecliptic
- wgk22
- · Replies 2 ·
Undergrad Deorbiting q, low speed reentry?
- MonstersFromTheId
- · Replies 8 ·
Graduate Gravitational Constant: G=0.0412 pc (km/s)^2 M_{\odot}^{-1}
- APhysxStudent
- · Replies 1 ·
Challenge, tell me what the u is about in ten easy steps
- wolram
- · Replies 1 ·
Graduate Are Black Holes Theoretical Phantoms?
- Phrak
- · Replies 12 ·
Graduate Initial Mass Function physics problem
- cluckaluck
- · Replies 3 ·
Graduate Would a black hole evaporate before you reached its center?
- SheepWShotgun
- · Replies 2 ·
How should we send messages to extraterrestrial life?
- frankinstein
- · Replies 14 ·
Graduate Big bangs origin relative to the earth's location
- a^6
- · Replies 26 ·