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 F=mv^2/r and Geosynchronouse orbits
- Elder
- · Replies 3 ·
Graduate Dimensions/parallel universe questions
- Doom_Machine
- · Replies 8 ·
Undergrad Is the starbirth rate still decreasing in galaxies?
- vincentm
- · Replies 8 ·
High School Why are black holes so heavy despite their tiny size?
- anarchy.spirit
- · Replies 11 ·
Using parallel dimensions as disposal for garbage and criminals
- Chaos' lil bro Order
- · Replies 30 ·
Stargazing Reflecting Telescopes: Hole in Picture at Focus?
- skiboka33
- · Replies 20 ·
Stargazing What does theta represent in the wavelength/D formula for telescopes?
- skiboka33
- · Replies 9 ·
Graduate Galaxy Rotation Curves Without Non-B. Dark Matter
- marcus
- · Replies 1 ·
High School Can 4D objects see lower dimensions like we see 3D objects?
- bayan
- · Replies 2 ·
Graduate Is anything in the universe purely random?
- decs
- · Replies 19 ·
Graduate Does quantum uncertainty limit how clearly we can observe distant galaxies?
- Spin_Network
- · Replies 3 ·
Graduate Is the Universe Shaped Like a Dodecahedron?
- Spin_Network
- · Replies 7 ·
Graduate [Andromeda] Fast traveling stars
- vincentm
- · Replies 11 ·
High School Project in relation to Einstein on geo-reactors
- dietrich schuler
- · Replies 1 ·
Graduate Is the universe still expanding?
- Simetra7
- · Replies 69 ·
Graduate Quantum Geometry and Schwarzschild Singularity?
- Spin_Network
- · Replies 2 ·
Graduate How can accurate orbits and masses be determined in astronomy?
- petra
- · Replies 1 ·
Do parallel universes exist or are they just speculation?
- ranger
- · Replies 2 ·
Graduate Fastest neutron star, 1100 km/second
- marcus
- · Replies 10 ·
Stargazing 135mm/f2.8 lens piggyback rig on ETX telescope
- russ_watters
- · Replies 3 ·
Graduate Could dark matter be error in GR or temporal effect
- jim_990
- · Replies 2 ·
Undergrad Is the Big Crunch a Mathematical Possibility for the Universe's End?
- aniket
- · Replies 2 ·
Undergrad Looking for an Introductory Book on Orbital Mechanics?
- BobG
- · Replies 3 ·
Undergrad What is dark matter and where is it found?
- aniket
- · Replies 4 ·
Graduate Where to find undergraduate-level stellar model physics
- Nereid
- · Replies 6 ·
Where do farts come from and why do they smell?
- Entropy
- · Replies 2 ·
Graduate AIAA - Textbooks in Aerodynamics and Space Engineering
- Astronuc
- · Replies 0 ·
Graduate Omega pointe and the Big crunch theories
- vincentm
- · Replies 6 ·
Graduate Halo and Lissajous Orbits: Powered or Natural?
- tony873004
- · Replies 5 ·
Graduate Could antimatter generate repulsive antigravitons to drive cosmic expansion?
- Nekromancer
- · Replies 8 ·
High School Relation between the moon's gravitation and the level of ocean
- kiru
- · Replies 1 ·
SpaceTiger has wandered into the cellar
- wolram
- · Replies 61 ·
High School What would be the effects of Earth not having a moon?
- vincentm
- · Replies 13 ·
High School Did Saturn's satellites collapse and then reconstruct?
- nzahra_ghasemi
- · Replies 9 ·
Did an Asteroid Really Hit Antarctica in 2004?
- LURCH
- · Replies 11 ·
Graduate What's the acceleration of our galaxy?
- Lucretius
- · Replies 9 ·
Undergrad Question on stellar absorption spectra
- ddoctor
- · Replies 25 ·
Graduate Most distant gammaray blast detected
- marcus
- · Replies 10 ·
Graduate An Old quasar in a Young Universe?
- Garth
- · Replies 14 ·
Undergrad What are some recommended objects for a semester project in optical astronomy?
- DarkEternal
- · Replies 1 ·
Graduate Space Ship Collision: How Far Did Meteorite Come?
- japam
- · Replies 2 ·
High School Is the Milky Way Moving Towards the Hydra Constellation?
- anarchy.spirit
- · Replies 3 ·
Graduate The solar systems and space probes
- vidmar
- · Replies 1 ·
Undergrad Theories about the beginning of the universe
- amitmis
- · Replies 1 ·
Graduate Clustering of primordial black holes
- wolram
- · Replies 7 ·
Graduate Formula for solar radiation pressure
- tony873004
- · Replies 8 ·
Course :astrophysics ,introduction ,e.a
- petra
- · Replies 1 ·
High School Identification of an object in the sky
- Cladson
- · Replies 6 ·
Undergrad Universe expansion and merging galaxies
- vincentm
- · Replies 20 ·
Undergrad Saturn's Rings Shifting: New Findings
- Cladson
- · Replies 3 ·
Undergrad Does light from the sun's edge have a different wavelength than light from its center?
- mcgucken
- · Replies 11 ·
High School Stars move as the night progresses
- big man
- · Replies 14 ·
Graduate Absorption in 'CMBR' wavelengths - observations? processes?
- Nereid
- · Replies 21 ·
Unknown object with tail in 15-second night sky exposure
- Uchuujin_7
- · Replies 4 ·
Undergrad Why Does Planet's Molten Core Create Magnetic Fields?
- sniffer
- · Replies 28 ·
Are we moving towards militarization of space?
- grant555
- · Replies 23 ·
Undergrad Can a Galaxy Collapse Inward Over Time?
- wonderingx
- · Replies 3 ·
Graduate Speculation is detracting true astrometry
- wolram
- · Replies 3 ·
Graduate Can space shrinking and expanding be used for travel?
- Tjl
- · Replies 4 ·
Stargazing What do you recommend is the best way to clean a lense(telescope)
- Cladson
- · Replies 1 ·
Mars rover adds hill climbing to list of accomplishments
- AA Institute
- · Replies 4 ·
How many tv programs are about astronomy, science?
- wolram
- · Replies 7 ·
Graduate Observational Dark Energy - SN1a wiggle room?
- Nereid
- · Replies 1 ·
Graduate The origin of cold dark matter halo density profiles
- Garth
- · Replies 2 ·
Stargazing How is the principle of the operation of radio telescope?
- yu_wing_sin
- · Replies 2 ·
If you could go anywhere in time and space
- Ivan Seeking
- · Replies 18 ·
Undergrad For those who think life is rare
- turbo
- · Replies 57 ·
Graduate Can You See the Entire Universe Before Entering a Black Hole?
- Temporarily Blah
- · Replies 9 ·
Undergrad What If the Earth's Orbit Was Changed?
- Boo75
- · Replies 11 ·
Undergrad [astrogeology] measuring atmospheric density
- vincentm
- · Replies 2 ·
Graduate What resources are available for studying higher dimensional quantum cosmology?
- ylping
- · Replies 6 ·
Bright light in western sky fading over 10 seconds
- matthyaouw
- · Replies 18 ·
Graduate Did condensation accompany the initial big bang expansion?
- Loren Booda
- · Replies 5 ·
Undergrad Everything about Big Bang theory
- Lisa!
- · Replies 20 ·
High School Why do some planetary orbits look circular while comets have ellipses?
- Ptolemy
- · Replies 15 ·
Graduate Isn't space expansion expectable?
- Gerinski
- · Replies 10 ·
Red object near horizon and color-flickering star in northeast sky
- Cladson
- · Replies 3 ·
Graduate 1 Parsec = 3.08568025 × 10^16 meters
- VantagePoint72
- · Replies 3 ·
Undergrad A supernova can out light a entire galaxy
- Zelos
- · Replies 5 ·
Undergrad Applications of optical fibers in astronomy
- alfu
- · Replies 1 ·
Graduate Does My NBody Simulation Look Accurate?
- crepincdotcom
- · Replies 7 ·
Undergrad Does the sun's mass decrease due to solar energy output?
- asdf1
- · Replies 6 ·
Undergrad Is Mounting a Telescope on the ISS a Viable Option for Atmospheric-Less Viewing?
- Phobos
- · Replies 2 ·
Graduate Mature stars in ancient galaxies
- turbo
- · Replies 42 ·
High School Why Do Planets Rotate on Their Axis?
- Caesar_Rahil
- · Replies 3 ·
High School What are neutron stars?
- BigBang
- · Replies 32 ·
Undergrad Is there a super-massive black hole in the center of our galaxy?
- Echo 6 Sierra
- · Replies 7 ·
Graduate On the large-angle anomalies of the microwave sky
- marcus
- · Replies 21 ·
Graduate Orbit smulation and speed of gravitation
- serge
- · Replies 3 ·
Graduate Do White Holes Really Exist and What Are Their Properties?
- paul_abbotts
- · Replies 8 ·
Undergrad What is the Chandrasekhar limit and how is it calculated?
- aniket
- · Replies 16 ·
Undergrad How closely could the Moon orbit the Earth
- ohwilleke
- · Replies 17 ·
Undergrad Free graphing software for polar coordinates
- HiPPiE
- · Replies 6 ·
Graduate Will galaxies continue to form, or has galactic creation ended?
- Spin_Network
- · Replies 15 ·
High School How Our Place in the Galaxy Affects Life on Earth
- Bobby R
- · Replies 5 ·
Undergrad When might humanity reach Type II and III civilizations?
- Whitestar
- · Replies 48 ·
Graduate Who was John Bahcall and what impact did he have on the astrophysics community?
- SpaceTiger
- · Replies 7 ·
High School Philosophy in The Elegant Universe
- Jeremy
- · Replies 6 ·
Graduate How did matter reach us before light from the Big Bang?
- Crumbles
- · Replies 20 ·
High School Viewing galaxies and nebulae from Florida with $800-900 budget
- Cladson
- · Replies 3 ·