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
High School Survival on Mars: Radiation & Temperature Challenges
- GTOM
- · Replies 297 ·
High School How can particles escape from a black hole?
- Aaron Maiwald
- · Replies 12 ·
Undergrad Why are non-relativistic particles not redshifted?
- RedDwarf
- · Replies 7 ·
Undergrad Observational Evidence for Metric Expansion of Space?
- kevindin
- · Replies 24 ·
Graduate KIC 8462852 (dipping again in March 2018)
- craigi
- · Replies 296 ·
High School Is there a specific unit used to measure redshift?
- ASmartDude
- · Replies 5 ·
Undergrad Why is the inflationary potential self-interacting?
- Apashanka das
- · Replies 3 ·
Graduate What could potentially explain the onset of the Pioneer Anomaly?
- GravityBound
- · Replies 5 ·
High School Interplanetary travel, Arctic sea ice
- cosmo777
- · Replies 85 ·
High School Curvature at the center of a spherical universe
- Grinkle
- · Replies 11 ·
Undergrad What is the net charge on the Earth?
- CWatters
- · Replies 42 ·
High School How do we know that the rate of expansion of the Universe was slowing down
- photonkid
- · Replies 11 ·
High School Extracting Spectra from Sloan Digital Sky Survey Data Releases 13 and 14
- quasarLie
- · Replies 13 ·
Undergrad VSl as an alternative to cosmic inflation
- windy miller
- · Replies 3 ·
Undergrad What Triggers the Universe's Most Powerful Collisions?
- jtlz
- · Replies 22 ·
Undergrad Why Are Space and Time Considered the Three Dimensions of Our Universe?
- Jeffrey phalen
- · Replies 8 ·
Undergrad Minimizing diffraction in images using a photodetector
- Phys12
- · Replies 1 ·
Undergrad Can Newton's Theory of Gravity Explain Planetary Elliptical Orbits?
- kent davidge
- · Replies 4 ·
High School Does the Big Bang model rule out an eternal universe?
- Oink Honey
- · Replies 94 ·
High School Is the Big Bounce Theory Plausible?
- wolram
- · Replies 29 ·
Undergrad How long will the CMB be detectable?
- Gerinski
- · Replies 12 ·
High School Sholz's star entered the Oort cloud ~70kya
- jim mcnamara
- · Replies 1 ·
Undergrad Why is the density of photons in the Eddington Limit derived this way?
- Aleolomorfo
- · Replies 3 ·
Undergrad Inflation & Ω: Dark Matter & Energy Impact
- Ranku
- · Replies 14 ·
High School Does the rapid inflation of the early universe violate the speed of light?
- zuz
- · Replies 13 ·
High School Does Human Population Growth Impact Lunar Orbit?
- David Prince
- · Replies 13 ·
Undergrad What is the recession speed of a galaxy based on the wavelengths of two stars?
- NebulaBilly
- · Replies 7 ·
High School Physicist who Questioned Black Holes
- jedishrfu
- · Replies 4 ·
Undergrad Discrepancy in the Hubble Paramater
- windy miller
- · Replies 37 ·
Undergrad Is dark energy the inflow of a universal black hole?
- tomwestboro
- · Replies 9 ·
High School Shape of Universe | Is It Same from Every Point?
- wolram
- · Replies 31 ·
Undergrad If Dark Matter and Dark Energy exist, what produces them?
- pixelperfect
- · Replies 9 ·
Undergrad Can dark matter explain dark energy?
- quantrex64
- · Replies 6 ·
Undergrad Qs re aspects of the Holmdel Horn Antenna used to find the CMB
- Buzz Bloom
- · Replies 69 ·
High School Third Cosmic Velocity: Will Voyagers Leave Solar System?
- fresh_42
- · Replies 2 ·
High School Are the Universe and Observable Universe Identical?
- ObjectivelyRational
- · Replies 32 ·
Undergrad How is the universe expanding if the speed of light is finite?
- Phys12
- · Replies 32 ·
High School What Is The Energy of a Point In Space?
- abrogard
- · Replies 32 ·
High School Does a partial solar eclipse never completely rise?
- swampwiz
- · Replies 18 ·
Undergrad Can Tidal Locking Occur in Binary Neutron Stars Before Merger?
- snorkack
- · Replies 10 ·
High School Who Was the Great Man We Lost on Pi Day and Albert Einstein's Birthday?
- Laurie K
- · Replies 2 ·
High School Remembering the Legacy of Stephen Hawking on Pi Day - BBC News
- unusually_wrong
- · Replies 1 ·
High School Life Outside Our Planet Without Oxygen and Water
- Space_Girl
- · Replies 30 ·
High School Gravity Emergent: Matter or Big Bang?
- wolram
- · Replies 10 ·
Undergrad [Question] Tell me the latest catching news about black holes
- BlackholeGirl
- · Replies 6 ·
Undergrad Would you see stars on the early Earth?
- windy miller
- · Replies 8 ·
Undergrad Does space have its own density?
- David Dodson
- · Replies 1 ·
Graduate IRAF xgterm implot unresponsive (mac OS High Sierra 10.13.3)
- SMBH
- · Replies 1 ·
High School What do people mean when they say the Universe is Computable
- TheQuestionGuy14
- · Replies 5 ·
High School Confusion about closed timelike curves
- laymanB
- · Replies 25 ·
Undergrad Was the Universe Really Dark and Quiet After the Big Bang?
- Wondermine
- · Replies 46 ·
Graduate Help with an Apollo space program flight simulation guide
- TaiBD
- · Replies 4 ·
Undergrad Observation of Alfvén waves heating the Sun's corona
- mfb
- · Replies 2 ·
Graduate Lane-Emden Eqn 5: Solving for Polytropic Index
- Apashanka das
- · Replies 1 ·
Undergrad Chandrasekhar Mass and the Relativistic Star: Finding the Value of K for n=3
- Apashanka das
- · Replies 5 ·
Undergrad Is the Sun's Magnetic Field Driven by a Double Dynamo?
- Teslascience
- · Replies 2 ·
Undergrad Are Friedman Equations Valid at the Moment of the Big Bang?
- haael
- · Replies 1 ·
Undergrad Do dark matter and dark energy have an effect on the red shift?
- Teslascience
- · Replies 41 ·
High School Spiral galaxies: Multiple axies of rotation?
- Buckethead
- · Replies 17 ·
Graduate What is the importance of EM measurements in astrophysics?
- binbagsss
- · Replies 3 ·
High School Massive Space Objects Have Connections to QM Math
- ISamson
- · Replies 1 ·
High School How can the Universe be infinite and yet have a finite age?
- RingNebula57
- · Replies 62 ·
Undergrad Confusion about Corotational and Lindblad resonance
- Aurorana
- · Replies 3 ·
Undergrad Calculate Voyager trajectory using JPL data
- Strides
- · Replies 1 ·
High School Are the profiles for reflecting/refracting spherical?
- swampwiz
- · Replies 4 ·
Undergrad Revolutionizing Space Travel: The Innovative Design of the Circular Module
- ZMacZ
- · Replies 3 ·
High School Is Space Expanding in a Relativistic Way?
- daisey
- · Replies 7 ·
Undergrad How close is Earth to the closest black hole?
- Buzz Bloom
- · Replies 79 ·
High School Are Dark Matter Concentrations on Earth Seasonal?
- bluecap
- · Replies 96 ·
Undergrad Wonderful new images of the center of our galaxy
- Spitfire
- · Replies 1 ·
Undergrad Universe's First Stars Interaction with Dark Matter
- bluecap
- · Replies 2 ·
Undergrad Can a Single Observation Determine Retrograde Motion?
- cptolemy
- · Replies 2 ·
Undergrad Perceived vs. Actual Velocity in an Expanding Universe
- zapnthund50
- · Replies 2 ·
Undergrad Heat death of the universe and the 3rd law of thermodynamics
- Robert Leslie
- · Replies 4 ·
High School How large would the sun be if it were frozen?
- dennis_n
- · Replies 12 ·
Undergrad Lunar apsidal precession relative to equinox
- fizzy
- · Replies 1 ·
High School Black holes and universe expansion
- Geo
- · Replies 22 ·
Undergrad Is the Universe a Mathematical Simulation?
- NotKepler
- · Replies 3 ·
High School When Does a Star Form & What's Best for Life?
- Stephenk53
- · Replies 2 ·
Undergrad Does the pattern of the CMB change?
- Sanborn Chase
- · Replies 2 ·
High School What do I need to become an Astrophysicist?
- Mlesnita Daniel
- · Replies 2 ·
Graduate Interacting Universes: Dark Matter & Gravity
- StavrosPanagiotidis
- · Replies 2 ·
Undergrad Supernova - the Birth of One is Spotted
- Tom.G
- · Replies 3 ·
Undergrad Will NASA Reveal Oxygen in TRAPPIST-1 Exoplanet Atmospheres?
- mfb
- · Replies 67 ·
Graduate Calculating the Altitude of a Nominal Burst
- Laurie K
- · Replies 8 ·
Undergrad Can Dark Energy Cause Deviations in Extremely Large Black Holes?
- A Puzzlement
- · Replies 3 ·
High School How do we measure the Spectral Energy Distribution of quasars?
- quasarLie
- · Replies 5 ·
High School Dark energy causing universe expansion?
- Kagrat
- · Replies 18 ·
Undergrad Help me understand these cosmological horizons and graphics
- Adoniram
- · Replies 7 ·
High School Current values for Friedman's scalar and its derivative?
- exmarine
- · Replies 4 ·
High School Conflicting thought on quasars and black holes
- VetStudent
- · Replies 6 ·
High School Accelerated expansion of the universe
- dayalanand roy
- · Replies 9 ·
High School Black hole gravitational pull questions
- hyunxu
- · Replies 30 ·
High School Black Holes Must Have Singularities Says Einstein Relativity
- Space_Girl
- · Replies 6 ·
Stargazing Where to buy telescope that measures spectrum?
- Duo Tao
- · Replies 3 ·
Stargazing How do you make polar alignment easier for stargazing photography?
- Space_Girl
- · Replies 7 ·
Undergrad How bright will Musk's Tesla car be in the sky?
- swampwiz
- · Replies 14 ·
High School Maximum weight of a Neutron star
- wolram
- · Replies 5 ·
Graduate Galaxy mass distribution without DM
- Jeon
- · Replies 9 ·
Graduate Virial thereom as applied to clusters of galaxies
- alantheastronomer
- · Replies 2 ·