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 Where Was Dark Energy Before the Accelerated Expansion Began?
- mieral
- · Replies 29 ·
Stargazing What is the Explanation for the SECCHI Image of Object Opening a Shield?
- infinitebubble
- · Replies 4 ·
High School What Saturn’s moon, Pan looks like
- BillTre
- · Replies 1 ·
High School Exactly how quantum tunneling leads to a Big Bang?
- Rodrigo Olivera
- · Replies 29 ·
Undergrad Could FRBs Power Extraterrestrial Light Sails?
- jim mcnamara
- · Replies 1 ·
Graduate How can neutron stars have magnetospheres?
- Cindy Hops
- · Replies 6 ·
Undergrad Q re early universe matter-antimatter annihilation
- Buzz Bloom
- · Replies 8 ·
Graduate Neutron Star EoS: Find the Equation of State
- Leonardo Machado
- · Replies 3 ·
Undergrad What is a Space-Time Crystal?
- dvdt
- · Replies 3 ·
Undergrad Predicted sizes of (observable) universe
- nomadreid
- · Replies 13 ·
High School What is the vacuum at the Karman line?
- mesa
- · Replies 1 ·
High School What are the most likely ways of finding Dark Matter?
- FelixH
- · Replies 10 ·
Graduate Space time expnasion, age of universe.
- Lacplesis
- · Replies 4 ·
High School Is 200my enough for galaxies to form
- wolram
- · Replies 6 ·
Undergrad Does Dark Energy drive up Entropy?
- FallenApple
- · Replies 7 ·
High School Are black holes perfect spheres?
- Alanay
- · Replies 14 ·
Graduate What is stochastic heating of very small grains?
- sonutabitha
- · Replies 2 ·
High School The Center of the Milky Way Galaxy?
- Goatman
- · Replies 16 ·
High School How Did the Universe Create Itself from Nothing?
- babbane9
- · Replies 5 ·
High School How is the Horizon Drop Calculated Due to Earth's Curvature?
- Axion
- · Replies 2 ·
High School Was there ever a state of nothingness?
- thetexan
- · Replies 5 ·
Undergrad Software for Analysis of FITS table/spectra
- SiuKing666
- · Replies 11 ·
Undergrad What Causes GRBs: Ampere's Law or Something Else?
- FallenApple
- · Replies 1 ·
High School Could a star burn hot enough to be invisible to human eyes?
- presto129
- · Replies 10 ·
High School Camera for a weather balloon pongsat mission
- Angela Ituriaga
- · Replies 5 ·
Undergrad What would happen if you moved a black hole?
- GA470
- · Replies 11 ·
High School What Happens When a Black Hole Interacts with Antimatter?
- Daniel Petka
- · Replies 10 ·
Undergrad Effect of rotational inertia on gravity or visa versa
- Scott444
- · Replies 5 ·
High School Is Time's Flow Affected by Cosmic and Quantum Scales?
- fwc
- · Replies 6 ·
High School Cepheid variable stars cause of light variance
- Glenn G
- · Replies 5 ·
Undergrad Do we need Dark Matter or are we just time blind
- Bruce Wilson
- · Replies 30 ·
High School If something stands absolutely still in the space can it time travel?
- julia orbey
- · Replies 24 ·
Undergrad Does Hubble's graph show velocity decelerating into the future?
- fencewalker
- · Replies 28 ·
High School Why Do Hot Stars Like Zeta Puppis Appear Blue Despite Low Wavelengths?
- PhysKid45
- · Replies 8 ·
Undergrad Interstellar travel/centrifugal couching
- Jigsaw674
- · Replies 5 ·
High School Why is vacuum energy assumed to be uniform?
- newjerseyrunner
- · Replies 5 ·
Undergrad Object moving out of the Observable Universe due to Expansion
- MLaw
- · Replies 12 ·
High School What is seen from the farthest star?
- bubal
- · Replies 55 ·
High School How can the Universe grow if it is infinite?
- Sen Turner
- · Replies 114 ·
Undergrad Find the Age of the Universe when Matter and Radiation densities were equal
- FallenGod
- · Replies 24 ·
Undergrad Exact expression for the tensor-to-scalar ratio
- Whitehole
- · Replies 3 ·
High School What can we see from the farthest reaches of the universe?
- Lewis123
- · Replies 5 ·
High School Generating Plausible Star Systems
- Dyrakean
- · Replies 2 ·
Graduate Does the Hadronic Era Alter the Equation of State?
- fhenryco
- · Replies 12 ·
High School Black holes are creating galaxies with their gravitational force
- acidmatic
- · Replies 11 ·
High School What would a timeline for the Big Rip look like?
- FelixH
- · Replies 2 ·
High School What is the appropriate time/matter model for the universe?
- BernieM
- · Replies 18 ·
Undergrad Can a finite universe end in heat death?
- durant35
- · Replies 32 ·
High School How can I conceptualise light and the known universe
- Lewis123
- · Replies 3 ·
Undergrad Problems with the theory of inflation
- kodama
- · Replies 13 ·
Stargazing How do astronomers measure the parallax angle of nearby stars?
- Glenn G
- · Replies 4 ·
Undergrad Does Earth's core gravity cancel out, and is density the real cause of time dilation?
- Jens K Munk
- · Replies 12 ·
High School Can the universe be both infinite and expanding?
- Physics_Kid
- · Replies 74 ·
High School The known universe is expanding?
- Lewis123
- · Replies 6 ·
Undergrad Are Galaxies Moving or is Space-Time Expanding?
- Arman777
- · Replies 5 ·
Undergrad Is there any international astronomy competitions for adults
- ahmadreza
- · Replies 5 ·
High School How would Earth's seasons change in a perfectly circular orbit?
- JohnWDailey
- · Replies 2 ·
Stargazing Are there astronomy competitions?
- GiantSheeps
- · Replies 11 ·
Undergrad Big Bang nucleosynthesis Wiki Equation for t x T^2
- Buzz Bloom
- · Replies 20 ·
Undergrad Does a photon's wavelength increase in its own reference frame?
- Grinkle
- · Replies 12 ·
Stargazing Is it a true explanation of an aberration of starlight?
- daggab
- · Replies 3 ·
High School Is Time Expanding Along with Space in the Expanding Universe?
- lomidrevo
- · Replies 6 ·
High School Can a solar sail be accelerated 20% speed of light
- wolram
- · Replies 16 ·
High School Why does cosmic expansion cause redshift if space isn't expanding into anything?
- unwillingly ignorant
- · Replies 16 ·
High School What fueled the Big Bang explosion?
- Brunolem33
- · Replies 20 ·
High School Is the center of the universe empty?
- Ed Lenarduzzi
- · Replies 39 ·
Stargazing [just for fun] Planet Definition
- WaxyChicken
- · Replies 2 ·
Undergrad How Would Future Species Understand a Dynamic Universe?
- maroubrabeach
- · Replies 34 ·
High School Would a manned flyby of Ceres be easier than a mars landing?
- donglepuss
- · Replies 8 ·
High School Could Current Technology Enable a Manned Mission to Europa?
- lifeonmercury
- · Replies 18 ·
High School Surface Temperatures - White Dwarf vs Neutron Star
- Jimmy87
- · Replies 7 ·
Stargazing А neutron star and a photon sphere
- daggab
- · Replies 2 ·
High School How long would remains be detectable?
- newjerseyrunner
- · Replies 4 ·
Undergrad Could ice exist in Lunar lava tubes?
- Al_
- · Replies 2 ·
High School Our atmosphere and the rotating Earth
- pkt
- · Replies 31 ·
Undergrad Why do quantum physicists claim that particles can tunnel out of a quantum well?
- shaiyefet
- · Replies 6 ·
Graduate Does time dilation near the Big Bang singularity affect the universe's age?
- Prophet
- · Replies 10 ·
High School Space news and events aggregator app
- orb_yt
- · Replies 2 ·
Undergrad Dark Matter Particles: College Student Seeking Theorem Evidence
- murenzi
- · Replies 3 ·
High School The distribution of normal matter precisely determines gravity
- wolram
- · Replies 4 ·
High School Does the Frequency of Gravitational Radiation Alter the Cosmological Constant?
- wolram
- · Replies 11 ·
High School Book recommendations for Big Bang Model?
- Bran
- · Replies 10 ·
High School Seeing Venus with the Naked Eye - Light Pollution
- Hawksteinman
- · Replies 4 ·
Graduate How Does Dark Matter Affect Galaxy Motion and Formation?
- PhotonSSBM
- · Replies 8 ·
High School Does time flow or do past, present, and future coexist?
- Greeneyes
- · Replies 2 ·
Stargazing What is the best way to reduce overexposure in DSLR astrophotos?
- QuantumPion
- · Replies 8 ·
Undergrad What Is the Cosmic Horizon and Its Relation to Black Holes?
- Arman777
- · Replies 11 ·
Undergrad Are we living in a Boltzmann box ?
- Arman777
- · Replies 2 ·
Undergrad A possible solution to the cosmic lithium problem
- Chronos
- · Replies 15 ·
High School Top 3 brighest planets as seen from other planets
- lifeonmercury
- · Replies 10 ·
High School Is Everything outside the local group moving away from us?
- unwillingly ignorant
- · Replies 2 ·
High School Arecibo Message: Will It Be Received 25,000 Years Later?
- lifeonmercury
- · Replies 4 ·
Graduate Zhang and Feng's claims of new fundamental forces
- Chronos
- · Replies 6 ·
Undergrad Variations in the local value of Hubble constant
- resurgance2001
- · Replies 9 ·
Undergrad How is the value of tT^2 calculated for neucleosynthesis
- Buzz Bloom
- · Replies 1 ·
Stargazing Can any material form a star if it has enough mass?
- helioscenturion
- · Replies 10 ·
Undergrad Can gravitational time dilation near black hole jets explain quasar redshifts?
- Mike Holland
- · Replies 2 ·
Undergrad What is the link between dark matter and antimatter in the universe?
- rootone
- · Replies 11 ·
High School Geology of Ceres illuminates origin of organics
- wolram
- · Replies 1 ·
Stargazing Can Venus be seen during the day from sea level right now?
- BenAS
- · Replies 1 ·