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 Are SN 1a light curves evidence of universal expansion?
- Lino
- · Replies 5 ·
Graduate How can a star in the Milkyway be nearly as old as the universe?
- broncorvette
- · Replies 11 ·
Graduate View of universe from event horizon of black hole
- mountainecho
- · Replies 11 ·
Undergrad Calculations for sun position follower
- oportunity
- · Replies 2 ·
Graduate Black hole accretion: angular momentum loss
- Aziza
- · Replies 7 ·
Graduate What do broad and strong emission lines mean and what are the main types of AGN?
- chickensagan
- · Replies 3 ·
Graduate Redshift of spinning star surface as seen on axis
- Jonathan Scott
- · Replies 6 ·
Which Authors Offer Recent Insights on Space/Time?
- goldsax
- · Replies 5 ·
Undergrad White Dwarfs,Black Dwarfs & neutron star
- a.ratnaparkhi
- · Replies 10 ·
Graduate The 'fermi Line' (the 130 GEv gamma ray signal)
- d3mm
- · Replies 4 ·
Graduate How orbiting bodies arrange themselves in orbital resonance?
- Neghentropia
- · Replies 6 ·
Graduate Questions on the Inflation Debate
- thenewmans
- · Replies 9 ·
Graduate Is the universe expanding or it is circuiting?
- Neghentropia
- · Replies 9 ·
Graduate Black Hole Radiation: Stephen Hawking's Theory Explained
- AbsoluteZer0
- · Replies 1 ·
Graduate The size of the universe at the big bang?
- JohnLuck
- · Replies 20 ·
Graduate Singularity and size of universe
- big_bounce
- · Replies 5 ·
Graduate Big Bang Matter-Antimatter Annihilation
- RJ Emery
- · Replies 29 ·
Graduate Inconsequence in Lawrence Krauss lecture
- Gloyn
- · Replies 4 ·
High School Intuitively - why aren't black holes hot?
- Tim13
- · Replies 41 ·
High School How to prepare an observation proposal for a professional telescope
- Schmetterling
- · Replies 18 ·
Undergrad What is different in Solar Radio vs Radio Flux 10.7 cm?
- junk0
- · Replies 3 ·
Undergrad Is there some liquid planets out there?
- MadAtom
- · Replies 4 ·
Graduate No Inflation in Brane Cosmology: Is Dark Energy the Driver?
- NeedBranes
- · Replies 5 ·
Graduate Where Can I Find Reliable Information on Dark Flow?
- julcab12
- · Replies 7 ·
Undergrad Active Galaxies and the Unified Model
- chickensagan
- · Replies 4 ·
Graduate Classsification of Pre main sequence(PMS) stars
- vrinda mukund
- · Replies 4 ·
Graduate Unleashing the Power of the Universe: The Mystery of Universal Energy
- NextFeynman
- · Replies 32 ·
Undergrad Are static models totally static?
- Lino
- · Replies 6 ·
Graduate Where does dark energy come from
- wolram
- · Replies 1 ·
Undergrad Low and high orbital energy differences (getting there and back)
- chris_c
- · Replies 10 ·
Undergrad Discovering the True Speed of Light: A Question on Its Absolute Nature
- thenewsguys
- · Replies 5 ·
High School Why Is the Solar System Structured the Way It Is?
- paras02
- · Replies 6 ·
High School Where can I find a downloadable database of stars?
- tris_d
- · Replies 11 ·
Graduate Luminosity Distance, Determination From Type Ia SN
- CSSlemaker
- · Replies 20 ·
How Can One Reach Outside of Time and Space?
- realflow100
- · Replies 7 ·
High School What Existed Before the Big Bang?
- Safamm
- · Replies 22 ·
Graduate Location of Earth in the Universe
- new23d
- · Replies 10 ·
Graduate Confusion about redshift in a universe with accelerating expansion
- Xilor
- · Replies 8 ·
Undergrad Is light pollution causing wasted energy and costing billions of dollars?
- Bobbywhy
- · Replies 4 ·
Undergrad What Is It Like at the Edge of the Universe?
- n_kelthuzad
- · Replies 25 ·
Graduate Deuterons used up before reaching the A=5 and 8 bottlenecks?
- bcrowell
- · Replies 6 ·
High School General question, where can I learn about all the constellations and
- oldspice1212
- · Replies 3 ·
Graduate Hey, I was reading Neil Turok's book (The Universe Within) and it got
- Andy Lee
- · Replies 1 ·
Stargazing Telescope Resolving Power Limits
- kmartin
- · Replies 23 ·
Graduate Does Photon Emission Influence Celestial Body Movement?
- Bjarne
- · Replies 29 ·
Graduate Can We Move in Planck Length and Dimension at the Time of the Big Bang?
- big_bounce
- · Replies 10 ·
Graduate New hab-zone planet HD40307g distance 42 ly, estim 7 earthmass
- marcus
- · Replies 2 ·
Graduate Is There a 100 Solar Mass Black Hole in Orion Nebula?
- PAllen
- · Replies 17 ·
Graduate What is the nature of matter and its relation to eternity?
- Atheists Era
- · Replies 5 ·
Graduate Does 171Å radiation correspond to 2 MK plasma in TRACE imaging?
- Bob65
- · Replies 1 ·
Graduate Z ~ 11 galaxy observed by CLASH most distant as of Nov 2012
- marcus
- · Replies 8 ·
Undergrad Is Space Considered a Medium for Photons and Other Waves?
- big_bounce
- · Replies 31 ·
Graduate Quasar Mass-Luminosity, High Mass Turnoff Evolution and a Synchronization Puzzle
- betzalel
- · Replies 7 ·
High School What is the Definition of Space in Physics?
- big_bounce
- · Replies 1 ·
Undergrad Big Bang Singularity: What is it?
- Nstraw
- · Replies 9 ·
High School Method for spaceship to be absolutely still in space
- Ringmistress
- · Replies 12 ·
Undergrad Orphan planets, i.e., planets not in a solar system
- Astronuc
- · Replies 9 ·
Undergrad Is a Webcam Better than a DSLR for Astrophotography?
- Cranfieldstar
- · Replies 32 ·
Undergrad Searching for Colliding Stars: Has the Phenomena Ever Been Observed?
- thetexan
- · Replies 8 ·
Adjective term of pertaining to a non-Earth moon
- EBENEZR
- · Replies 15 ·
Graduate Is spacetime not the same as space and time ?
- Atheists Era
- · Replies 4 ·
Graduate If doppler shift can be caused by gravity
- hog
- · Replies 8 ·
Graduate Is the Universe Truly Infinite and Ever-Expanding?
- Supaiku
- · Replies 87 ·
Undergrad Will Earth pass through the galactic plane in 2012?
- wmhrae
- · Replies 4 ·
Graduate Since the Sun is losing mass, can a planet's orbit change be measured?
- BarnRat
- · Replies 2 ·
Graduate Observable universe and events between vast distances
- julcab12
- · Replies 9 ·
Graduate Understanding Jeans Instability & Masses
- Cmertin
- · Replies 1 ·
Undergrad You always hear people say that the universe is made of matter and energy
- jaydnul
- · Replies 2 ·
Graduate Measuring the Distance Between First & Last Particles of the Big Bang
- reportman
- · Replies 1 ·
Undergrad Why does smaller angular resolution mean better resolution?
- zoiberg137
- · Replies 2 ·
Graduate Longitude of the Ascending nodes (calculation, wrong data perhaps?)
- Implicant
- · Replies 9 ·
Graduate Inverse square law resolves Olbers' paradox
- tris_d
- · Replies 58 ·
Graduate Recent papers relevant to cosmology that seemed extra interesting
- marcus
- · Replies 1 ·
High School Since the earth orbits in an ellipse, not a circle
- jaydnul
- · Replies 2 ·
Graduate What Is the Nature of the Space Left Behind After the Big Bang?
- reportman
- · Replies 4 ·
Undergrad Does Dark Energy Repel Light and Cause Damage?
- alext180
- · Replies 2 ·
Graduate An amusing paper about the size of the Universe
- plerza
- · Replies 20 ·
Undergrad Can Black Holes Bend Time?
- Atheists Era
- · Replies 3 ·
Graduate Does time run fast near universe's edge?
- ksertatas
- · Replies 6 ·
Stargazing 60-80 mm refracting telescope for beginners
- FreeMitya
- · Replies 5 ·
Graduate Correct interpretation of terms in proper velocity expression?
- johne1618
- · Replies 4 ·
High School Gravitational Constant: Questions and Ideas
- Numeriprimi
- · Replies 2 ·
Undergrad How does momentum dumping work on the Hubble Space Telescope?
- Fi-reefly
- · Replies 2 ·
Graduate Can a Spacecraft Achieve Light Speed Using Jupiter's Magnetic Field?
- sr241
- · Replies 4 ·
Graduate What is the Color of a Neutron Star?
- Jarfi
- · Replies 43 ·
Stargazing How do radio telescopes form images?
- Drakkith
- · Replies 18 ·
Graduate Measurment that proves that the universe is flat
- alkmini
- · Replies 8 ·
Undergrad How to convert flux from counts to erg.
- RHK
- · Replies 3 ·
Graduate Expansion of Universe but no expansion of galaxies
- BOYLANATOR
- · Replies 14 ·
Graduate Are there non-spherical blackholes?
- Lino
- · Replies 4 ·
Stargazing World’s largest Cherenkov telescope opens
- edguy99
- · Replies 6 ·
Graduate Is the speed of light constant for a co-moving observer?
- johne1618
- · Replies 14 ·
Graduate Are rays from opposite sides of a hot spot of CMB parallel or not?
- alkmini
- · Replies 6 ·
Undergrad Urban Space Saving: Reducing Traffic with Raised Roadways and Shops
- LughGlas
- · Replies 1 ·
High School Does the Earth actually revolve around the Sun
- Manula
- · Replies 23 ·
Graduate Heat of the Big Bang: Understanding CMB & Accuracy
- wolram
- · Replies 9 ·
Graduate Is age of universe adjusted for gravity?
- KenJackson
- · Replies 6 ·
Undergrad Can Amateur Telescopes Detect Exoplanets?
- SpaceDreamer
- · Replies 11 ·
High School Planet Found Orbiting Alpha Centauri
- Drakkith
- · Replies 31 ·
Graduate Does energy dilate time like mass?
- KenJackson
- · Replies 1 ·