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.
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Hubble's camera goes into safe mode
- neutrino
- · Replies 3 ·
Graduate What causes coronal loops in the solar corona?
- Michael Mozina
- · Replies 19 ·
Undergrad Photon coming from a far away star is redshifted?
- Ratzinger
- · Replies 12 ·
Graduate How Does a Tiny Dot's Mass Distort Space Time?
- Intuitive
- · Replies 1 ·
Graduate Hubble Recession vs. Moon Recession
- kmarinas86
- · Replies 7 ·
Undergrad Is Dark Matter Invisible and Untouchable?
- tribdog
- · Replies 21 ·
Graduate Tensor Vector scaler theories.
- toph
- · Replies 5 ·
High School How many Kuiper Belt objects have been detected so far?
- big man
- · Replies 6 ·
Undergrad What Are the Expansive and Contractive Cycles of the Universe?
- shawngoldw
- · Replies 1 ·
Graduate The universe, are we on the right track?
- Leonardo Sidis
- · Replies 3 ·
Undergrad How do scientists predict star and planet positions?
- mubashirmansoor
- · Replies 1 ·
Undergrad What If Earth Suddenly Reversed Its Rotation or Changed Its Axis?
- Mt. Nixion
- · Replies 3 ·
Graduate Is a zero energy universe a consequence from FRWL equations
- hurk4
- · Replies 1 ·
Undergrad Does rising ocean level affect Earth's rotation and Moon's orbit?
- dimensionless
- · Replies 4 ·
Graduate Book suggestion in reply to question from oldman
- marcus
- · Replies 19 ·
Undergrad Deriving Distance Modulus: m - M = 5log(d/10)
- toam
- · Replies 2 ·
Graduate What gave rise to the fundamental constants and laws of physics?
- Markrids
- · Replies 5 ·
Graduate Relative peculiar velocity of MBR vs that of neutrino background
- Loren Booda
- · Replies 3 ·
Undergrad Calculating the gravitational accelleration on the surface of a planet
- dimensionless
- · Replies 4 ·
Undergrad Why is my computer not moving away from me in an expanding universe?
- Andy_Electron
- · Replies 3 ·
Graduate What Causes Craters to Center Themselves on Other Craters?
- smurfslappa
- · Replies 1 ·
Graduate 20 trillion solarmass hot cloud going 750 clicks
- marcus
- · Replies 2 ·
Graduate Do MECO models match observations of galactic black holes?
- Nereid
- · Replies 2 ·
Graduate Do Black Holes Experience Inertia and Gravity?
- string querry
- · Replies 6 ·
Do you believe in dark matter and dark energy or modified gravity?
- brahma
- · Replies 45 ·
Can telescopes see the flags and landing modules left on the moon?
- sneez
- · Replies 5 ·
Graduate Is the Universe Beyond Our Perception?
- Mt. Nixion
- · Replies 2 ·
Graduate Problems with light travel-time distance in cosmology
- marcus
- · Replies 9 ·
Who created this running difference image?
- Michael Mozina
- · Replies 2 ·
Graduate Starkman tinkers with MOG (relativistic MOND)
- marcus
- · Replies 3 ·
Graduate Terminal Velocity: Speed Beyond the Universe
- drakken1985
- · Replies 3 ·
What existed before the big bang?
- time traveller d
- · Replies 42 ·
Undergrad Is the Big Bang Like a Ripple in a Pond?
- fr0st2k
- · Replies 8 ·
Graduate Was the Big Bang a Black Hole Explosion?
- mateuszica
- · Replies 1 ·
High School Could Life Be Evolving in Galaxies 1.5 Million Light Years Away?
- IllogicalDreamr
- · Replies 2 ·
High School Solar and Lunar exposure tables information
- Labguy
- · Replies 1 ·
Stargazing Have you seen the stunning night sky in New Mexico captured with a Canon 300D?
- larkspur
- · Replies 7 ·
Graduate Eclipsing binaries (references to data and models?)
- robphy
- · Replies 7 ·
Graduate Does space expand through us or stay attached to us?
- Jimmy Snyder
- · Replies 50 ·
Graduate Is Causality Fundamental in the Universe?
- kmarinas86
- · Replies 10 ·
High School Where Can I Find a List of Stars in Gould's Belt?
- hellfire
- · Replies 9 ·
Graduate How does MOND differ from the inverse-square law?
- Chaos' lil bro Order
- · Replies 3 ·
Graduate Gammaray Bursts (all you ever wanted to know)
- marcus
- · Replies 12 ·
Graduate New map of the galaxy (Levine Blitz Heiles)
- marcus
- · Replies 4 ·
High School How did Einstein show the universe was expanding?
- waznboyd
- · Replies 3 ·
Stargazing Meade DSI Pro II: First LRGB Photo of Whirlpool Galaxy
- russ_watters
- · Replies 3 ·
Stargazing Telescope recommendation for a beginner under $100
- Knavish
- · Replies 3 ·
Graduate What Effect Does Cosmological Expansion Have on Solar System Mass?
- pervect
- · Replies 6 ·
Undergrad Redshifts, what frequencies are they looking at?
- dimensionless
- · Replies 12 ·
Graduate Structure of the Milkyway Spiral Redifined
- neutrino
- · Replies 2 ·
Graduate Photon frequency loss over time?
- rcgldr
- · Replies 40 ·
Graduate Gravitational collapse, star precipitation and black hole formation.
- oldman
- · Replies 10 ·
Is the universe examining itself?
- RAD4921
- · Replies 56 ·
Graduate What Density of Radiation Triggers Gravitational Clumping and Black Holes?
- moving finger
- · Replies 1 ·
Graduate Pioneer anomaly and dark matter: are these real physics issues?
- Farsight
- · Replies 17 ·
Graduate How does the cosmic microwave background (CMB) define a cosmological frame?
- helenwang413
- · Replies 3 ·
Undergrad Electromagnetic waves and dak matter
- Quantum1332
- · Replies 7 ·
Graduate The Virial theorem and Cosmology
- oldman
- · Replies 27 ·
Graduate Gammaray Sky animation (what GLAST will see)
- marcus
- · Replies 0 ·
Graduate How could the universe possibly expand?
- cliowa
- · Replies 2 ·
High School What Are Color Shifts Like Redshift in Science?
- eggman
- · Replies 20 ·
Graduate Why logic and reason fail when we try to trace back the origin of universe
- naveen
- · Replies 20 ·
High School Terraforming Mars: Strange Ideas and Possibilities
- drakken1985
- · Replies 2 ·
Graduate Cosmology-Particle Physics connection (Mark Trodden)
- marcus
- · Replies 1 ·
Graduate What could deep underground astronomers observe about the universe?
- Nereid
- · Replies 23 ·
Graduate Alternative Solutions to Deflecting Asteroids or Comets From Earth
- drakken1985
- · Replies 5 ·
Undergrad Can a Planet's Gravitational Force Prevent a Comet or Asteroid Collision?
- MathematicalPhysicist
- · Replies 3 ·
High School Does the Moon's Orbit Stay the Same?
- mubashirmansoor
- · Replies 7 ·
High School Is this YouTube meteor impact simulation realistic?
- darkar
- · Replies 2 ·
Graduate What is the Accreting Matter Paradox in Astrophysics?
- StatusX
- · Replies 1 ·
Voyager 2 Detects Odd Shape of Solar System's Edge
- scott1
- · Replies 3 ·
Graduate Molecular Hydrogen at the Edge of Universe
- Astronuc
- · Replies 9 ·
High School Can stars escape their galaxies and exist between them?
- wolram
- · Replies 8 ·
Graduate Does the Hubble Constant Variation Over Time Affect the d/R = v/c Equation?
- kmarinas86
- · Replies 2 ·
Undergrad Can the Mass of Cosmic Rays in the Universe Be Calculated?
- Qmon
- · Replies 6 ·
High School Why Won't Earth Fall into the Sun?
- FeynmanMH42
- · Replies 7 ·
Graduate How to probe the homogeneity of the universe ?
- brahma
- · Replies 8 ·
Undergrad How did Leverrier and Adams calculate Neptune's position?
- ZZ Top
- · Replies 2 ·
Graduate Would people age faster or slower in a 92-day Earth orbit around another star?
- complexPHILOSOPHY
- · Replies 10 ·
High School Does Jupiter have a solid core or is it gas all the way through?
- Quadruple Bypass
- · Replies 9 ·
High School Is there white hole in the universe?
- the Physic freak
- · Replies 10 ·
Graduate How do you interpret the Robertson-Walker metric
- oldman
- · Replies 26 ·
Graduate Why did neutrino decoupling occur before photon decoupling?
- Chaos' lil bro Order
- · Replies 6 ·
Undergrad What Could We See If We Observed the Big Bang with a Powerful Telescope?
- Abbas Ibn Firnas
- · Replies 12 ·
Behind the border of the universe
- rudeonline
- · Replies 7 ·
Graduate Alternative interpretation of relativity with consciousness as universe's boundary
- rudeonline
- · Replies 9 ·
Graduate Could Changing Gravitational Constant Explain Hubble's Law Alternatives?
- gptejms
- · Replies 77 ·
Graduate What Are the Leading Theories on Dark Energy?
- Chaos' lil bro Order
- · Replies 17 ·
Comet Impact on Earth May 25th - Is It True?
- mohlam12
- · Replies 3 ·
High School Why do Neutron Stars have a Magnetic Field?
- axel65
- · Replies 3 ·
Undergrad How do accretion disks provide evidence for black holes?
- StatusX
- · Replies 2 ·
Undergrad Can Two Equal-Mass Planets Share a Satellite?
- Semaphia
- · Replies 6 ·
High School Stoping the desturaction of the sun?
- scott1
- · Replies 16 ·
Graduate Evolution of the Observable Universe
- Chronos
- · Replies 20 ·
What is the significance of the astronomical buckyball?
- neutrino
- · Replies 1 ·
Graduate Why do we live in a Friedmann universe?
- marcus
- · Replies 10 ·
Undergrad Does gravity explain all orbits in our solar system?
- Paula
- · Replies 1 ·
Graduate Rates of galactic evolution (first 3 billion years)
- kmarinas86
- · Replies 12 ·
High School My First Telescope Observation: Jupiter & 4 Moons
- Kazza_765
- · Replies 2 ·
Could dune-boarding be possible on Titan's dunes?
- quantumcarl
- · Replies 11 ·