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 Can Einstein's Field equation explain inflation?
- andrewkirk
- · Replies 12 ·
Graduate Can the universe expand if it's already infinite in size?
- Physics_Kid
- · Replies 104 ·
High School Why Do Some Galaxies Have a Spiral Shape?
- deepthishan
- · Replies 6 ·
Undergrad Question on Red shift applied to objects within the same galaxy
- TheDarkFrontie
- · Replies 3 ·
Undergrad Understanding Frame Dragging: Explanation and Effects
- keepit
- · Replies 10 ·
Graduate A temporally and spatially open universe
- Naty1
- · Replies 4 ·
Graduate Distribution of mass - from decoupling to present
- Loren Booda
- · Replies 11 ·
Graduate How Does Heliocentric Julian Day Enhance Eclipsing Binary Analysis?
- Sastronaut
- · Replies 5 ·
Graduate Understanding LIGO and Its Implications
- wolram
- · Replies 1 ·
Graduate What happens to the shape of particles when exposed to massive gravity?
- Damo ET
- · Replies 4 ·
Graduate How does the cosmic microwave background reveal the universe's early evolution?
- Leandro Souza
- · Replies 1 ·
Graduate 1000 TeV neutrinos - dark matter decay proposed as explanation
- marcus
- · Replies 20 ·
Graduate Could dark matter be negative pressure
- DannyOberthier
- · Replies 5 ·
Graduate What is wrong with eternal inflation model?
- Dmitry67
- · Replies 9 ·
Graduate Difference between Big Chill and Big Snap scenarious
- Dmitry67
- · Replies 4 ·
Graduate How To Determine The Exact Speed You Are Moving In The Universe
- phys-if
- · Replies 2 ·
Graduate Multiverse Evidence Explanation?
- TheDemx27
- · Replies 120 ·
Graduate What is Space outside of the universe and infinity according to Physics?
- KiranKai
- · Replies 56 ·
High School What is the sun's corona and how can it be captured in a photograph?
- z.js
- · Replies 1 ·
Graduate Why Use Wave Modes to Describe Density Fluctuations?
- Madster
- · Replies 7 ·
Graduate Why galaxies are further from us
- keepit
- · Replies 14 ·
Graduate Apparent magnitude of the Moon from Mercury?
- rtfirefly
- · Replies 3 ·
High School What Makes the Cat's Eye Nebula's Core Appear So Energetic?
- skyshrimp
- · Replies 4 ·
Graduate Theoretical physicist says universe has radius=10cm
- Tweak88
- · Replies 11 ·
Graduate Why Does the Cosmological Constant Have Different Units?
- jimjohnson
- · Replies 9 ·
High School Can we tell when a Star has died the moment it happens?
- GKDAIR
- · Replies 5 ·
Undergrad How Do You Calculate the Sunset Time on the Winter Solstice at 40 Degrees North?
- smmSTV
- · Replies 1 ·
Graduate Do our inertial frames rotate with the Milky Way?
- Vincentius
- · Replies 6 ·
Undergrad The age old age of the universe question
- Igottaknow
- · Replies 11 ·
Graduate Could there be a connection between the cosmological background
- goldust
- · Replies 2 ·
Graduate Inflationary cosmology questions
- ilikescience94
- · Replies 10 ·
Graduate Why the fundamental laws of nature is the way it is?
- PhysicsMonk
- · Replies 5 ·
High School Why Do Stars Appear to Move in a Four-Year Cycle?
- shirin
- · Replies 1 ·
Graduate Cosmological Principle: Trying to define large-scale homogeneity
- andrewkirk
- · Replies 13 ·
Graduate New space that accounts for dark energy?
- keepit
- · Replies 20 ·
Undergrad We cannot measure the speed of light
- willigee
- · Replies 8 ·
Graduate Looking for a decent gravity simulator
- Decimator
- · Replies 4 ·
Graduate Are We Living Inside a Black Hole?
- jimjohnson
- · Replies 10 ·
Graduate Could the Universe Be Shrinking Instead of Expanding?
- deaconblues
- · Replies 7 ·
Graduate Questions and comments about cosmo FAQ
- marcus
- · Replies 0 ·
High School Growth of Universe: Branching vs Other Reasons
- rshreyas
- · Replies 3 ·
Graduate Could meteorites contain evidence of troilite drainage and trapped iron grains?
- snorkack
- · Replies 6 ·
Graduate Could an Anti-Universe Exist?
- Bill.in.PA
- · Replies 26 ·
Graduate Why can we see space, but not time?
- Jupiter60
- · Replies 43 ·
Undergrad Is there any relation between orbital motion and spin motion?
- cooper607
- · Replies 4 ·
Undergrad Distance to the Sun using Venus transit
- ExoP
- · Replies 4 ·
Graduate Color temperature and effective temperature of a star
- alialice
- · Replies 1 ·
Graduate Does ACE IMF Polarity Come from Bz Data?
- space0
- · Replies 1 ·
Graduate Improving Meteor Image Quality: Methods for Noise Reduction and Detection
- solarblast
- · Replies 7 ·
Graduate An infinite universe is necessarily in expansion
- Rip
- · Replies 16 ·
Graduate Can we trust our measurements in cosmology?
- sithe
- · Replies 11 ·
Undergrad Does ''expanding space'' mean formation of new space?
- tarekatpf
- · Replies 3 ·
Graduate Is Universal Time the Key to Understanding Existence?
- lostglutton
- · Replies 18 ·
Graduate How are inflaton particles that drive the early inflation created?
- Dilatino
- · Replies 8 ·
Graduate Shouldn't objects entering black holes be instantly shredded?
- qwertyflatty
- · Replies 42 ·
Undergrad Research topics in Variable stars
- bsleis01
- · Replies 2 ·
Graduate Nutronstars - how they can put out light?
- Low-Q
- · Replies 6 ·
Undergrad Have we ever sent anything into the atmosphere of the gas giants?
- GKDAIR
- · Replies 5 ·
Undergrad What Is the Orbital Length in Km on This Graph?
- Windows
- · Replies 1 ·
Graduate Is there evidence of space surrounding the BB singularity?
- keepit
- · Replies 13 ·
Graduate Chances of hitting something in intergalactic travel
- Gerinski
- · Replies 3 ·
Undergrad More garbage science reporting about the sun
- davenn
- · Replies 9 ·
High School Universe will end in 5 billion years?
- NextElement
- · Replies 3 ·
Spot a Nova in Delphinus - Bright Mag 6
- davenn
- · Replies 5 ·
High School Phases of the Moon: Amateur Questions Answered
- FOIWATER
- · Replies 6 ·
Graduate Experimental status of stellar structure
- muppet
- · Replies 4 ·
Graduate What is the size of a singularity in a black hole?
- daveian
- · Replies 46 ·
Undergrad Will the Earth survive the Sun becoming a red giant?
- Jupiter60
- · Replies 10 ·
Graduate Are Quantum Mechanics and Cosmology Directly Linked?
- jimjohnson
- · Replies 1 ·
Graduate What Are the Different Types of Symmetries in Grand Unified Theory?
- shounakbhatta
- · Replies 2 ·
Graduate Luminosity Distance: Explaining the Length Differences
- Myslius
- · Replies 14 ·
Graduate What were the initial ingredients of the BB
- Tanelorn
- · Replies 7 ·
Undergrad Access Solar Radiation Data: UV-A, UV-B & UV-C
- Optocopto
- · Replies 2 ·
Graduate Consequences of parallel universes
- RobinSky
- · Replies 7 ·
Graduate Are There Other Universes with Different Laws of Physics and Math?
- Jupiter60
- · Replies 25 ·
Graduate Are branes valid science or just fancy math?
- physorguser
- · Replies 5 ·
High School Is there a temperature in the universe beyond Earth's atmosphere?
- Knightycloud
- · Replies 10 ·
Graduate Could Dark Matter and Dark Energy Just Be a Result of Particles in Space?
- jwalk5763
- · Replies 10 ·
Stargazing Saving the telescope with damaged optics
- Sarsat
- · Replies 18 ·
Graduate Using positive pressure in cosmological equations
- StateOfTheEqn
- · Replies 7 ·
Graduate Solving Kepler Problem for 2-Body System: Velocity & Position
- Philosophaie
- · Replies 5 ·
High School Can I Use Microwaves to Study Asteroids?
- Vipertiper
- · Replies 7 ·
High School What is dark matter and dark energy, and how do we know they exist?
- HU742
- · Replies 7 ·
Graduate How Did Quarks Occur in the Early Universe?
- PhyHunter
- · Replies 3 ·
Graduate Gravitational Collapse: Is Black Hole Formation Inevitable?
- eightsquare
- · Replies 14 ·
Undergrad Planet formation vs Sun collapse
- vikasagartha
- · Replies 5 ·
High School Earth sized lava world discovered
- Jupiter60
- · Replies 10 ·
Graduate The epansion of space, not matter
- m_robertson
- · Replies 7 ·
Graduate Is the Universe's Expansion Uniform?
- nst.john
- · Replies 4 ·
Graduate Metric expansion in terms of planck pixels
- tobiasnas
- · Replies 1 ·
High School Heat Death of the Universe: Is It Inevitable?
- Nugso
- · Replies 6 ·
Undergrad What evidence supports the validity of the Big Bang theory?
- fuzzzles
- · Replies 44 ·
Graduate Matter ingestion rate of blackholes
- rjpearce
- · Replies 3 ·
Media hype about meteor showers
- sophiecentaur
- · Replies 12 ·
What is the mysterious purple-violet oval in the night sky?
- Disgusting spy
- · Replies 10 ·
High School Why can't we whistle in a closed space?
- Boorglar
- · Replies 7 ·
Graduate A question relating to expansion rate of the Universe
- Tanelorn
- · Replies 31 ·
Graduate Compact 3-manifolds of Negative Curvature
- StateOfTheEqn
- · Replies 2 ·
Graduate Holographic principle, mathematical universe & dimensional reduction
- tobiasnas
- · Replies 1 ·
High School An Aurora Watch alert issued today
- davenn
- · Replies 2 ·