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 Who was Ralph Alpher and what impact did he have on the world of physics?
- robphy
- · Replies 2 ·
Stargazing Which Telescope Should I Buy for Astrophotography and Viewing?
- Saladsamurai
- · Replies 36 ·
Graduate Three video-talks on the CMB and structure of universe
- marcus
- · Replies 1 ·
Graduate Are we just a simulation? (Woit's message to the overlords: Dont turn us off)
- marcus
- · Replies 1 ·
Graduate Supermassive blackholes and galaxy formation.
- Benzoate
- · Replies 8 ·
Undergrad Does the number 47 have significance in the universe's basic structure?
- imranyusuf
- · Replies 3 ·
High School Is the moon's orbit around Earth truly circular?
- unrepentant
- · Replies 5 ·
Graduate IGC Inaugural Conference (Institute for Gravitation and the Cosmos)
- marcus
- · Replies 4 ·
Graduate Why Does the Sun's Surface Gravity Seem So Low Compared to Expectations?
- H8wm4m
- · Replies 10 ·
Graduate Entropy in a contracting universe?
- nicktacik
- · Replies 8 ·
Graduate 60 efolds with no inflaton, no slow roll, no reheating-QEG's apt to be right
- marcus
- · Replies 24 ·
High School Mira's tail discovered by NASA
- Ivan Seeking
- · Replies 3 ·
Undergrad Why do gamma ray bursts last only about 2 seconds?
- say_physics04
- · Replies 6 ·
High School Is the Sun an Ordinary or Atypical Star?
- Holocene
- · Replies 2 ·
High School How Stars are Formed - Astronomy Basics
- ihopeican
- · Replies 2 ·
Undergrad What is the alternative to the concept of a singularity in cosmology?
- mattex
- · Replies 10 ·
High School Frequency of supernovae in the universe
- Holocene
- · Replies 8 ·
Graduate Supernova types 1a and the accelerating cosmos
- stevebd1
- · Replies 1 ·
Stargazing What can I get to improve telescope
- Saladsamurai
- · Replies 47 ·
Undergrad Duration formula for constant acceleration spaceflight with acceleration and deceleration
- DaveC426913
- · Replies 24 ·
Stargazing Liquid Mirror Telescope: How to create a parabolic shape
- jasc15
- · Replies 3 ·
Graduate What quark collision experiments tell us about the big bang?
- uiulic
- · Replies 1 ·
Graduate How Can an Infinite Universe Expand?
- fmichel
- · Replies 33 ·
Graduate Are there any theories about why causality appears?
- arcturus12453
- · Replies 6 ·
Graduate What do we mean by Is the universe losing energy ?
- Robert100
- · Replies 6 ·
Are we going to continue to expand.
- tommyburgey
- · Replies 1 ·
Graduate What Are Gravity, Dark Matter, and Atoms?
- andyp
- · Replies 3 ·
Graduate Can you travel to another dimension by passing through a black hole?
- raccoon
- · Replies 22 ·
Graduate Could the universe's energy density have been greater in the past?
- jostpuur
- · Replies 6 ·
Graduate If energy can't be created, where did the universe's energy come from?
- Ifrit
- · Replies 6 ·
Graduate How is Lorentz Contraction Manifested in a Distant Supernova?
- japam
- · Replies 1 ·
Graduate Cosmology at differing values of c?
- MarkeD
- · Replies 7 ·
Graduate What Are Some Recommended Graduate Level Texts on Stellar Spectroscopy?
- RJ Emery
- · Replies 1 ·
Undergrad Do gravitational waves cause the mass of their source to decrease?
- vs_cygnus
- · Replies 6 ·
Undergrad Question re: Planets Facing Each Other
- JorgeMedinero
- · Replies 1 ·
Graduate Let's try something-let me know if you have difficulty
- marcus
- · Replies 20 ·
Graduate A white dwarf formed by a supernova, possible?
- RetardedBastard
- · Replies 2 ·
Undergrad How Can You Calculate the Area of Light Hitting a Dome?
- laminatedevildoll
- · Replies 5 ·
Graduate When was the last time all inner planets aligned in our solar system?
- Loren Booda
- · Replies 4 ·
Graduate How cant EM wawe escape from a black hole?
- fresnelspot
- · Replies 3 ·
Undergrad At what distance does the moon's gravity exceed Earth's?
- H8wm4m
- · Replies 11 ·
Undergrad Water found on distant planet (hot Jupiter at 63 LY)
- marcus
- · Replies 5 ·
Graduate Is Consciousness a Process Inherent in the Universe?
- alexsok
- · Replies 21 ·
Graduate Using JPL Horizons to Obtain Inertial Positions and Velocities: A Tutorial
- playmobil
- · Replies 2 ·
Graduate Wright's 'best fit' universe does not expand out into empty space
- marcus
- · Replies 3 ·
Undergrad What is the accepted diameter of the universe?
- Voltage
- · Replies 34 ·
Graduate What does Renate Loll's work on quantum foam mean for cosmology?
- Steve1
- · Replies 2 ·
Do you unfriend people on Facebook/Myspace?
- Simfish
- · Replies 23 ·
Graduate Does a black hole's gravity exceed the speed of light?
- Liger20
- · Replies 5 ·
What will be the after effects of the suns polar magnetic shifts?
- scarfox
- · Replies 5 ·
Undergrad Does a black hole have a finite radius or is it zero?
- delta_simon
- · Replies 12 ·
Undergrad Does the Saros Cycle Provide Accurate Eclipse Predictions Across Time?
- lewis198
- · Replies 5 ·
Graduate Model a Cooling Sphere: Finding Resources
- MarkL
- · Replies 2 ·
Graduate Will cosmic microwave background disappear?
- maris205
- · Replies 2 ·
Graduate Coordinate confusion in conformal cosmology
- marcus
- · Replies 4 ·
What is the empty space in an unopened 2 liter bottle of soda?
- ggh
- · Replies 11 ·
Stargazing Great Canary Telescope - First Light
- Astronuc
- · Replies 1 ·
High School Why not design future spacecraft with UFO-like shapes for better aerodynamics
- Mackay1011
- · Replies 6 ·
Graduate Is this line element known to anyone ?
- Mentz114
- · Replies 8 ·
Graduate Selecting a Recent Space/Astro Physics Research Topic
- Huma waseem
- · Replies 2 ·
Graduate How does the age of the Universe relate to the Big Bang theory?
- Thor
- · Replies 4 ·
Galaxy Zoo citizen science project
- J77
- · Replies 6 ·
Graduate Expanding space as a framework for cosmological evolution
- marcus
- · Replies 12 ·
Graduate Redshift 9, oldest galaxies seen yet
- marcus
- · Replies 1 ·
Undergrad Question regarding sun/moon angle
- vanburen_boy
- · Replies 5 ·
Undergrad Does Superconductivity Occur in Outer Space?
- Loren Booda
- · Replies 2 ·
Graduate What causes electrons in the aurora to accelerate and emit radiation?
- SpitfireAce
- · Replies 10 ·
Graduate Why does the Hubble parameter vary with time?
- sergei
- · Replies 8 ·
High School What can I see with my Sky Watcher telescope?
- james bibey
- · Replies 6 ·
Graduate Did scientists discover a pre-Big Bang universe?
- DaveC426913
- · Replies 6 ·
How to find any naked-eye object
- eZipSky
- · Replies 5 ·
Undergrad How do white dwarfs reveal the universe's expansion history?
- physicshelp1
- · Replies 1 ·
Graduate Big Bang Question: Is Our Universe Expanding Through Vacancy?
- BJL
- · Replies 3 ·
Undergrad What Natural Laws Influence Human Artistic Expression?
- performartist
- · Replies 8 ·
Graduate Simulating the gravitational interaction between two material points
- Signifier
- · Replies 3 ·
Graduate Shining light thru the sun: evidence of axions?
- marcus
- · Replies 2 ·
Graduate How would the solar system capture an extra solar planet ?
- supag33k
- · Replies 14 ·
Graduate Is Our Universe Just a Preon in a Larger Cosmic Structure?
- ziad1985
- · Replies 4 ·
High School How do space probes take color photos if their cameras are black and white?
- brianthewhitie7
- · Replies 4 ·
Graduate 'Spinning' the truth about our own Moon?
- Techstuf
- · Replies 17 ·
Which Planets Are Visible Today?
- Hurkyl
- · Replies 4 ·
High School Why the Moon Doesn't Fall on the Earth
- sinisha
- · Replies 15 ·
High School Full Moon Height: When is It Highest?
- haiha
- · Replies 4 ·
Graduate without resorting to scalar fields
- marcus
- · Replies 1 ·
Graduate Could a distant brown dwarf companion explain outer solar system anomalies?
- Astrobuff
- · Replies 7 ·
Graduate Is Gravitational Radiation the Key to Unlocking Cosmology's Secrets?
- wolram
- · Replies 8 ·
Graduate On the 'constantness' of Hubble's Constant
- Brinx
- · Replies 8 ·
High School Liftoff for Ceres and Vesta (July 2007)
- marcus
- · Replies 7 ·
Graduate Can MOND be ruled out at laboratory scale?
- Jonathan Scott
- · Replies 7 ·
Graduate Lyman Page new idea for CMB observations
- marcus
- · Replies 5 ·
Graduate Does a singularity violate the uncertainty principle?
- SpitfireAce
- · Replies 2 ·
Undergrad Looking once around the universe
- birulami
- · Replies 7 ·
Graduate MOND-related Formula in GR Calcs at Cosmological Scale
- Jonathan Scott
- · Replies 1 ·
Undergrad What is the impact of the moon's mass on Earth's orbit around the sun?
- ukmicky
- · Replies 5 ·
Graduate Ratio of radiaton energy to mass energy?
- Nasher
- · Replies 13 ·
Graduate Are Parallel Universes Possible According to M-Theory?
- Nasher
- · Replies 3 ·
Undergrad How does the Julian day number formula work?
- lewis198
- · Replies 4 ·
Graduate The link between the cosmological constant and the higgs field
- deneve
- · Replies 6 ·
Graduate Review of Dark Matter and Dark Energy by M. Kamionkowski
- EL
- · Replies 5 ·
Graduate How do X-rays and gamma rays escape from black holes?
- Pakbabydoll
- · Replies 3 ·