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 Entropy and the big bang on to the big crunch and back
- misnderstudge
- · Replies 1 ·
High School Lifetime of Earth: Planet vs Sun
- mersecske
- · Replies 3 ·
Graduate How this equality exist between time and distance and the velocity
- karawan
- · Replies 6 ·
Undergrad Universe Today: What Does It Look Like?
- binbots
- · Replies 2 ·
High School Binary universe theory with black holes and white holes
- spacegeek101
- · Replies 3 ·
Interactive panoramic of space
- jhae2.718
- · Replies 1 ·
Graduate Gamma photon distribution in the galaxy and absorption processes
- mersecske
- · Replies 1 ·
Graduate Where is the center of mass of the universe?
- Quinzio
- · Replies 14 ·
Graduate Black holes and higher dimensional universe
- pibb
- · Replies 4 ·
High School What is meant by floating, flying and moving freely in space?
- karawan
- · Replies 7 ·
High School French claim first habitable planet found
- aychamo
- · Replies 4 ·
Graduate H-alpha line in galaxies/ hubble redshift
- SUDOnym
- · Replies 1 ·
Undergrad How Does Gravity Cause Acceleration Towards a Massive Object in Space?
- automan
- · Replies 4 ·
Graduate Puzzled by new confirmation of dark energy
- phinds
- · Replies 3 ·
Undergrad The mesure of distances using the redshift
- houhou.trad
- · Replies 3 ·
Graduate What Could Have Possibly Triggered the Big Bang?
- abhiroop_k
- · Replies 3 ·
Undergrad Relationship between mass and surface temperature of a star
- jewfro420
- · Replies 7 ·
Graduate Dark energy observations in young and evolving universe
- Naty1
- · Replies 1 ·
Graduate Why Do Some Stars Grow So Massive?
- mjacobsca
- · Replies 3 ·
Undergrad How Powerful Is a Supernova in Megatons?
- FishmanGeertz
- · Replies 36 ·
Undergrad Why does the nebular disk flatten during solar system formation?
- Trinitiet
- · Replies 6 ·
High School When did we realize the Sun is a star like those in the night sky?
- dotancohen
- · Replies 18 ·
Graduate Could undiscovered sister stars be hiding in our Oort cloud?
- cph
- · Replies 2 ·
Graduate Tabeshband solar shading design at 36°N latitude
- trina1990
- · Replies 2 ·
Undergrad Estimating the radius of planets
- trina1990
- · Replies 4 ·
Undergrad How can Jupiter's gravity eject asteroids from the solar system?
- ExNihilo
- · Replies 3 ·
Graduate Is Dark Energy Propelling the Accelerating Expansion of the Universe?
- ibysaiyan
- · Replies 7 ·
Undergrad Can rogue planets explain dark matter?
- Tanelorn
- · Replies 6 ·
Undergrad Server to query for sun/planets elevation at a given datetime?
- dotancohen
- · Replies 4 ·
Graduate Dark Matter Distribution in the Milky Way
- mersecske
- · Replies 6 ·
High School How does imaginary time work in cosmology?
- nomisrosen
- · Replies 8 ·
Undergrad How do I calculate the direction from one geographic point to another?
- RAHIL008
- · Replies 1 ·
Graduate Inflation timeline and scale: conflicting numbers in literature
- phinds
- · Replies 4 ·
Undergrad How Does Time Connect to Space in Our Universe?
- Cbray
- · Replies 8 ·
What is the Best Book for Learning About Astronomy?
- phyzzy_physh
- · Replies 7 ·
Undergrad Could Rogue Planets be an Alternative to Dark Matter?
- lalbatros
- · Replies 3 ·
Graduate Why does time move slower in stronger gravitational fields?
- Blingles
- · Replies 3 ·
Graduate How does inflation create density perturbations without destroying them?
- cp05
- · Replies 14 ·
Graduate News Article + Paper on Dark Energy
- cepheid
- · Replies 1 ·
Graduate Understanding curvature and dimensions
- TrickyDicky
- · Replies 12 ·
Undergrad Outer planets always gas planets?
- JV
- · Replies 12 ·
Graduate What happens to time inside a black hole?
- Wazkick3n
- · Replies 29 ·
Graduate Are cosmological redshifts evidence for accelerating expansion or just past inflation?
- krrazypassion
- · Replies 5 ·
Red shape with jets in Google Sky map
- Willis666
- · Replies 19 ·
Undergrad What is an equal-sun-elevation day called?
- dotancohen
- · Replies 15 ·
Graduate Einstein's Gravity: Challenging the Traditional Concept of Forces
- ender_88
- · Replies 4 ·
Graduate What are quantum fluctuations and how could they have led to human life?
- narrator
- · Replies 20 ·
Graduate Why don't distant galaxies appear less densely packed from their perspective?
- keepit
- · Replies 7 ·
Graduate Can a single wormhole have more than two mouths?
- Godspanther
- · Replies 21 ·
Graduate Can We Travel at Light Speed and Return to Earth?
- narrator
- · Replies 13 ·
Graduate What are the physical differences between matter and antimatter?
- Cosmo Novice
- · Replies 2 ·
What is next for the US space program?
- khemist
- · Replies 3 ·
Undergrad What is the difference between the left and right pictures of a Quasar Core?
- Drakkith
- · Replies 4 ·
High School Has a Star Collision Ever Been Observed in Our Universe?
- |Orion's Thought|
- · Replies 16 ·
Graduate Why do galaxies drift apart in the expanding universe?
- Hexorg
- · Replies 4 ·
Graduate Are Black Holes sufficiently characterized?
- cph
- · Replies 3 ·
Graduate How do I develop physical intuition for the tidal force?
- Simfish
- · Replies 1 ·
Graduate Is There a Maximum Rotational Velocity for Pulsars?
- Plaster
- · Replies 9 ·
Graduate What are the informations deducible from hubble diagram of supernova 1a?
- humanist rho
- · Replies 1 ·
Graduate What is space and what is time?
- Tanelorn
- · Replies 36 ·
Graduate Big Crunch. What happens at the moment the universe changes direction?
- dabayman
- · Replies 7 ·
Undergrad Asteroid Impact Crater Size: Function of Diameter
- mersecske
- · Replies 3 ·
Graduate What existed before the bigbang?
- mdmaaz
- · Replies 8 ·
Graduate Information about stars indeterminate?
- Helicobacter
- · Replies 7 ·
Undergrad How Did Ancient Civilizations Accurately Predict Astronomical Events?
- BrockLee
- · Replies 4 ·
What do you think of the void theory vs acceleration article?
- TalonD
- · Replies 34 ·
Graduate How Can Quasar Beams Emerge from Black Holes Despite the Event Horizon?
- lnsanity
- · Replies 7 ·
Undergrad Measuring time in the 17th century.
- Spinnor
- · Replies 24 ·
Undergrad What's the opposite of a blackhole?
- mdmaaz
- · Replies 6 ·
Graduate Dark matter exerting a gravitational effect on earth?
- albroun
- · Replies 7 ·
Undergrad Calculating the size of planets from length of days.
- conrad141
- · Replies 4 ·
Graduate Is the Expanding Universe Slowing Down According to Age?
- meatym
- · Replies 4 ·
Undergrad Is Faster-Than-Light Space Travel Possible with New Technology?
- Astro.padma
- · Replies 18 ·
Graduate What came before the Big Bang?
- McHeathen
- · Replies 32 ·
Graduate Draw Confidence Contours to Hubble's 1929 Data
- humanist rho
- · Replies 45 ·
Undergrad Are Asteroids Outside Our Solar System and the Moon Affected by Impact Tsunamis?
- mersecske
- · Replies 6 ·
Graduate Light approaching the event horizon
- permapoop
- · Replies 5 ·
High School Do Galaxies Move? Rotation Around Something?
- mdmaaz
- · Replies 5 ·
Graduate A Closed Universe and the Horizon Problem
- jfy4
- · Replies 9 ·
Undergrad What are the consequences of pole reversals on Earth
- Tokage
- · Replies 9 ·
Graduate Can tidal forces change a satellite's orientation while maintaining Earth lock?
- firavia
- · Replies 4 ·
Undergrad Do we see the universe the way it is?
- mdmaaz
- · Replies 38 ·
Undergrad Would Earth and moon accelerate toward each other at the same rate as Earth and sun?
- Restructure
- · Replies 35 ·
Graduate Baby Universes? - Leonard Susskind's Hyperspace Theory
- kcajrenreb
- · Replies 1 ·
Graduate Does This Cosmological Model Re-Collapse?
- ajclarke
- · Replies 8 ·
High School Expansion of the Universe and Time
- agreen
- · Replies 5 ·
Undergrad What methods are used to CONFIRM the compisition of a star from spectral lines?
- Tokage
- · Replies 1 ·
Undergrad Why the plane of the rings is vertical to the rotation axis of Saturn?
- Chris2MIT
- · Replies 11 ·
Undergrad Do photons travel between every pair of atoms in the universe?
- Darken-Sol
- · Replies 17 ·
Graduate Why don't objects approaching a black hole's event horizon appear to slow down?
- moejoe15
- · Replies 20 ·
Graduate Can a collapsing star only form a black hole if it has a companion?
- TheBlackNinja
- · Replies 7 ·
Graduate What exists outside the expanding universe?
- redthinker
- · Replies 9 ·
Graduate Would overcharging an extremal black hole tear it apart?
- kcajrenreb
- · Replies 5 ·
High School Do two objects moving in parallel with the same velocity experience different times?
- karawan
- · Replies 2 ·
Undergrad Physics of a satellite orbiting the sun
- Polama
- · Replies 10 ·
Undergrad Elliptic orbit of earth round the sun
- Apache
- · Replies 1 ·
Graduate So, what is the function for the redshift z as a function of distance r?
- jfy4
- · Replies 13 ·
Graduate Need VERY recent paper in observational astronomy for journal club presentation
- omoplata
- · Replies 1 ·
Graduate Why tidal forces near a black hole depend on its size
- nukeman
- · Replies 16 ·
Graduate Was the Big Bang a Low Entropy State in the Universe?
- johne1618
- · Replies 4 ·