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 Does space expansion stretch a megaparsec rod at the Hubble rate?
- srikkanth_kn
- · Replies 2 ·
Undergrad Why can't we harness energy from space and transmit it back via a space elevator?
- juice81sc
- · Replies 10 ·
High School Is the ground moving or are we moving?
- AlisonArulia
- · Replies 20 ·
Graduate Potential energy of a particle within a dark matter halo
- florian101
- · Replies 9 ·
Where does word universe originate from?
- anonymoussome
- · Replies 21 ·
Graduate What Happens to Gravity and Temperature at the Center of a Black Hole?
- cragar
- · Replies 33 ·
Undergrad So how fast are we actually moving?
- Nexus555
- · Replies 75 ·
Graduate No need for dark energy , gravity will suffice.
- Peter Watkins
- · Replies 85 ·
Graduate How seriously do you take the FLRW model?
- skippy1729
- · Replies 16 ·
Graduate Wanted to find out some things about the universe
- RowRow
- · Replies 3 ·
High School Why does the sun travel faster about its equator?
- Ian_Brooks
- · Replies 10 ·
Undergrad Why does the sun have non uniform distribution of magnetic fields?
- Ian_Brooks
- · Replies 3 ·
Graduate Can Black Holes Create Interdimensional Bridges to Other Universes?
- cattatomic
- · Replies 5 ·
Undergrad Determining the individual magnitudes of two stars
- Mike89
- · Replies 2 ·
Graduate Thor's Helmet: Pre-Supernova with Emissions Nebula?”
- Stratosphere
- · Replies 2 ·
Graduate Converting chaotic inflation potential V(Phi) to mass/volume units
- edgepflow
- · Replies 1 ·
Graduate 2 Q's - hawking radiation and inflationary universe
- jnorman
- · Replies 9 ·
Graduate Effective Destructive Range of Supernovae?
- EngineeredVision
- · Replies 5 ·
High School Can I (amateur astronomer) detect extrasolar planets?
- SpicVir
- · Replies 9 ·
How Can I Make the Moon Look Bigger Using Mirrors?
- ragabonds
- · Replies 2 ·
Graduate When Did Gravity Separate from Other Forces After the Big Bang?
- benk99nenm312
- · Replies 2 ·
Graduate What would happen if two black holes collided at the speed of light?
- jontyjashan
- · Replies 13 ·
Graduate What causes the research interest in cosmology?
- marcus
- · Replies 14 ·
High School Is There a Preferred Plane for Satellite Orbits?
- DecayProduct
- · Replies 1 ·
Undergrad Universe Energy: Where Does It Come From?
- octelcogopod
- · Replies 4 ·
Graduate Mean Intensity Magnitude of Variable Star
- emtilt
- · Replies 2 ·
How, in GOD'S NAME, does one pronounce Wolf-Rayet
- Astrofiend
- · Replies 5 ·
Graduate Finite universe and inflation theory
- honzik
- · Replies 29 ·
Graduate What is the initial force of universe expansion?
- Ranku
- · Replies 1 ·
Graduate Universe expanding faster than light
- camilus
- · Replies 58 ·
Graduate Could quasar gamma radiation indicate antimatter abundance at cosmic distances?
- thebaron
- · Replies 4 ·
Undergrad Why is space so afraid of matter?
- Tommahawk
- · Replies 1 ·
Undergrad How can the small angle formula be used to measure the physical size of a star?
- Fisicks
- · Replies 3 ·
High School Can Planets Be Juggled Between Binary Stars?
- Quantum_Grid
- · Replies 2 ·
Graduate Three body problem with a satellite orbiting an orbiting body
- JANm
- · Replies 4 ·
Graduate Scaling Cosmologies: Solving the Coincidence Problem
- wolram
- · Replies 4 ·
Military Covering up Fireballs from Space
- benk99nenm312
- · Replies 8 ·
Undergrad How would a man on earth appear from outer space
- vijay_singh
- · Replies 4 ·
Undergrad Density and temperature ranges in interstellar medium objects
- treddie
- · Replies 6 ·
Stargazing Is a .1MHz RF Choke Necessary for the Itty Bitty Radio Telescope?
- redguy12
- · Replies 5 ·
High School Why is there no atmosphere on moon
- jontyjashan
- · Replies 6 ·
Graduate Is Betelgeuse Already a Supernova?
- mgb_phys
- · Replies 3 ·
Graduate Why use total derivatives instead of partial derivatives for specific intensity
- cepheid
- · Replies 2 ·
Is the Alternate Big Bang Theory Supported by Scientific Evidence?
- Ultrastar 1
- · Replies 4 ·
Graduate Link White hole and our Universe
- TheRK
- · Replies 3 ·
Graduate Gravitational Lensing: Accretion Discs Around Black Holes
- charlespune
- · Replies 4 ·
Undergrad Why did light from the early universe take 13.7 billion years to reach us?
- redwards
- · Replies 6 ·
Graduate Raisin pudding or balloon at LHC
- Pjpic
- · Replies 1 ·
Graduate Wolfgang Rindler: Godel's Remarkable Excursion into Cosmology
- George Jones
- · Replies 1 ·
Graduate Why do inflation and dark energy have energy scales differing by 10^27?
- Xezlec
- · Replies 8 ·
Graduate Can We Really Observe White Holes, or Do They Only Exist Mathematically?
- Kit
- · Replies 14 ·
Graduate Measuring Black Hole Gravity with a Laser
- deathstar
- · Replies 1 ·
Graduate M87 black hole mass revised to 6.4 billion solar masses
- Astronuc
- · Replies 3 ·
Undergrad Rearranging the distance modulus equation for d
- log(3.14)
- · Replies 6 ·
What organization officially names stars and exoplanets?
- frankinstein
- · Replies 15 ·
Graduate Does time dilation cause redshift?
- d0wnl0w
- · Replies 2 ·
Graduate Fundamental parameter probabilities
- Pjpic
- · Replies 4 ·
Graduate Ekpyrotic model versus inflationary cosmology
- Naty1
- · Replies 7 ·
The universe 700 trillion light years away.
- SpaceGuy50
- · Replies 7 ·
High School What is the gravitational acceleration on Earth's surface?
- markalloyd1
- · Replies 2 ·
High School Liquid ocean in Uranus and Neptune
- SpaceGuy50
- · Replies 8 ·
Graduate Why did matter dominate over antimatter in the early universe?
- joychandra
- · Replies 6 ·
Undergrad Is there any formula to calculate the effect gravity has on time
- d0wnl0w
- · Replies 2 ·
Graduate Hubble age estimate accuracy with different redshift interpretations
- yogi
- · Replies 11 ·
Graduate How Do Black Holes Emit Radio Waves if They Only Suck Things In?
- Siadeug
- · Replies 12 ·
Undergrad Solar Wind's Effect on other Planets
- Philosophaie
- · Replies 2 ·
Graduate Scale of inflation and dark energy
- zeebo17
- · Replies 1 ·
Graduate Alternate universe attractive/repeling force?
- cabledog
- · Replies 8 ·
Can Penguin Poop Really Be Seen from Space?
- Math Is Hard
- · Replies 11 ·
Has anyone not seen Google sky? What did you think?
- Spinnor
- · Replies 1 ·
High School Can we see our own galaxy out there due to gravitational effects?
- NWH
- · Replies 5 ·
How can I tell if the night sky is observable from here?
- TidusBlade
- · Replies 4 ·
Undergrad What Do You Need to Know About Star Clustering Research?
- heavenscloud
- · Replies 1 ·
Graduate What Are the Implications of Ignoring Pre-Big Bang Events?
- gabrielh
- · Replies 4 ·
Graduate Understanding Superluminal Jets and Accretion Emissions from Black Holes
- protonchain
- · Replies 2 ·
High School Why does a comet's tail point away from the sun, not its direction of travel?
- ManDay
- · Replies 7 ·
High School Gaining Understanding of Force for Launching a Rocket/Satellite into Space
- WarrickF
- · Replies 20 ·
Graduate Does the Expansion of the Universe Defy the Law of Conservation of Energy?
- flawless86
- · Replies 2 ·
Graduate Evidence for dark energy equation of state paramater w = -1
- Mosis
- · Replies 2 ·
Graduate Size of the *observable* universe (noob questions about)
- marcus
- · Replies 8 ·
Undergrad Galaxies receeding at and above speed of light
- chicopee
- · Replies 15 ·
High School Is a KBO the Size of Mars Considered a Planet?
- SpaceGuy50
- · Replies 1 ·
Graduate Caroline Moore's discovery of supernova 2008ha at age 14
- Astronuc
- · Replies 5 ·
Undergrad How long until the Sun becomes a black dwarf?
- SpaceGuy50
- · Replies 1 ·
High School Does the moon's gravity affect Earth satellites?
- thomasxc
- · Replies 2 ·
Graduate Derivation of (linearized) perturbation equations
- Angelos K
- · Replies 2 ·
Undergrad Exoplanets seem all to have elliptical orbits
- cosmicpencil
- · Replies 3 ·
Math is Hard - the Aerospace Engineer
- DaveC426913
- · Replies 12 ·
Graduate Comparing spectra of HD 93521 with different wavelength spacing
- cepheid
- · Replies 4 ·
Challenging Claims of Proof for Evolution: The Scientific Perspective
- prysdieheer
- · Replies 2 ·
Graduate What happens to a light beam in a flat universe with finite size?
- benk99nenm312
- · Replies 13 ·
Graduate Proof of the curvature of space-time?
- Roo
- · Replies 6 ·
Graduate Derive flight path angle from orbital elements
- h4tt3n
- · Replies 1 ·
Graduate Could we detect an antimatter galaxy that never contacts normal matter?
- kumar1988
- · Replies 22 ·
Graduate Accounting for Cosmological Expansion in Distance Measurements
- Brantoc
- · Replies 1 ·
Episode of The Universe (WMAP)
- benk99nenm312
- · Replies 17 ·
Undergrad Solar Coraona, Photosphere, and temperture
- Starwatcher16
- · Replies 1 ·
Undergrad How Did Planets Enter Their Orbits?
- ajassat
- · Replies 3 ·
Graduate What is time and how does it affect our perception of space and light?
- Anuraj Pillay
- · Replies 1 ·
Undergrad Maximum size for a comet to maintain an elliptical orbit
- raknath
- · Replies 12 ·