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
Undergrad Questions about Negative Pressure and Vacuum Energy
- darkdark10
- · Replies 5 ·
Undergrad If the Universe had a different size, would physics change?
- Suekdccia
- · Replies 15 ·
Undergrad Is the CPT-Symmetric Universe Theory the Key to Solving the Antimatter Mystery?
- Quarker
- · Replies 1 ·
Undergrad Alexander Vilenkin and energy of a closed universe
- Question69
- · Replies 32 ·
High School Sun contains more oxygen, silicon and neon than previously thought
- Astronuc
- · Replies 5 ·
Undergrad Seeking reference for math related to the age of Recombination
- Buzz Bloom
- · Replies 3 ·
Undergrad Lateral offset from a centered star as measured at the focal plane
- Benschu
- · Replies 3 ·
Undergrad Magnetar Mystery: How Do Neutrons Generate a Magnetic Field?
- swampwiz
- · Replies 3 ·
High School Derivation for Aphelion and Perihelion Distances
- bruhh
- · Replies 3 ·
Undergrad What is the current status of Voyager 1's attitude and control system?
- Alltimegreat1
- · Replies 34 ·
Undergrad How to use astronomical spectra?
- yucheng
- · Replies 3 ·
Undergrad European Southern Observatory (Event Horizon Project team) – picture of Sgr A*
- pinball1970
- · Replies 12 ·
High School What day/exact time does Sun start to move again? (1980 Winter Solstice)
- UniversalEnergy03
- · Replies 13 ·
Undergrad What happens first -- Sun Red Giant or Andromeda collision?
- Philosophaie
- · Replies 3 ·
Undergrad Dawn dead in Ceres orbit, ran out of fuel Oct 2018
- marcus
- · Replies 1K ·
High School Explaining Cosmic Inflation using analogies
- Paolo 2008
- · Replies 3 ·
Graduate Understanding distances in Cosmology
- Arman777
- · Replies 1 ·
High School Scope Eyepiece diameter for old eyes
- DaveC426913
- · Replies 1 ·
Undergrad Will the upcoming experiment PICO measure kSZ temperature anisotropy?
- SherLOCKed
- · Replies 1 ·
High School Event Horizon Telescope, Milky Way supermassive black hole stream
- Orodruin
- · Replies 8 ·
High School Is Entropy the Key to Understanding the Big Bang and the Fate of the Universe?
- C_Nordquist
- · Replies 27 ·
High School Which Way Do Planets in Our Galaxy Spin?
- Canada Bob
- · Replies 7 ·
High School Our Sun's position in the Milky Way Galaxy
- abdossamad2003
- · Replies 2 ·
High School How does the Milky Way galaxy move in the local Group?
- abdossamad2003
- · Replies 2 ·
Undergrad Looking for a chart showing various growths of the Universe
- Buzz Bloom
- · Replies 14 ·
High School Accelerating to a stop in the Milky Way Galaxy
- Dang3rmouse
- · Replies 8 ·
Graduate Peebles Equation for fractional electron density
- member 657093
- · Replies 7 ·
Undergrad What's the source of energy for the universe's expasion?
- lordoftheselands
- · Replies 5 ·
High School How good are our ears? (Detectable Interstellar signals)
- Canada Bob
- · Replies 7 ·
Stargazing Planetary Lineup and Eclipse Viewing Tips for Cruise Ship Passengers
- neilparker62
- · Replies 12 ·
Stargazing Size of Star Images: Electronic Effect, Feynman Paths, or Daft Question?
- TerryW
- · Replies 4 ·
Undergrad Do gravitons interact with gravitons?
- KurtLudwig
- · Replies 100 ·
Graduate Can Representing Ideas be Possible?
- BiaCarvalho
- · Replies 8 ·
High School Would like to explore the Henry Draper catalogue of stars
- Cerenkov
- · Replies 2 ·
Undergrad A busy and interesting night sky in Mackinaw City
- Kwantumnaut
- · Replies 1 ·
Undergrad Observations fit poorly with the Standard Model of Cosmology
- Buzz Bloom
- · Replies 34 ·
High School Mini spacecraft to Alpha Centauri
- kolleamm
- · Replies 11 ·
Undergrad How is the sound horizon at recombination and BAO measured in the CMB?
- jordy1113
- · Replies 1 ·
Undergrad How far into the Universe can we theoretically reach?
- plin092
- · Replies 34 ·
Undergrad Is Entropy in the Universe Lower Now Than After the Big Bang Due to Heat?
- shlosmem
- · Replies 25 ·
Undergrad What Prevents Electrons from Expanding Radially in White Dwarfs?
- MarkL
- · Replies 7 ·
Undergrad Varying laws of high energy physics in inflation?
- Suekdccia
- · Replies 4 ·
High School First Interstellar Asteroid Found
- CygnusX-1
- · Replies 125 ·
Undergrad First Interstellar Object to Hit Earth
- Jarvis323
- · Replies 2 ·
Undergrad Gravitational Field with Dark Energy: Observable Effects?
- kodama
- · Replies 1 ·
Stargazing Hubble Spots Farthest Star Ever Seen
- diogenesNY
- · Replies 9 ·
Undergrad An odd result from integrating to calculate the age of the Universe
- Buzz Bloom
- · Replies 21 ·
Undergrad Information lost at the Big Crunch?
- Suekdccia
- · Replies 3 ·
Undergrad What Does Radiation Do to Space Ice?
- Albertgauss
- · Replies 12 ·
Undergrad Questions about bayronic acoustic oscillations
- Buzz Bloom
- · Replies 9 ·
Undergrad The Big Bang and the original size of Universe
- Martyn Arthur
- · Replies 1 ·
High School Can electromagnetic waves traverse wormholes?
- GatherEvidence
- · Replies 8 ·
High School Is Language Barrier a Reason for Our Limited Understanding of Black Holes?
- A. Neumaier
- · Replies 23 ·
Undergrad MOND from galaxies that are fractal
- kodama
- · Replies 10 ·
Graduate Questions: Gott-Li Can a Universe Create Itself?
- AntHak
- · Replies 2 ·
High School What is the oldest of each class of star?
- plin092
- · Replies 2 ·
High School Northern Lights Visible in Mid States Tonight
- DaveC426913
- · Replies 4 ·
High School Why combine the JWST data physically instead of digitally?
- DaveC426913
- · Replies 6 ·
High School Could anything heat back up the core of Mars?
- Isopod
- · Replies 9 ·
Stargazing Is There a Reliable Supernova Alert System?
- Loup909
- · Replies 5 ·
High School What happens to the Core of a main sequence star as additional mass is added?
- MikeeMiracle
- · Replies 42 ·
Undergrad Is a horseshoe orbit a hyperbolic orbit?
- Mike S.
- · Replies 2 ·
Undergrad Information loss in black hole, why is it a problem?
- OscarCP
- · Replies 10 ·
High School Experimental evidence on cosmological redshift
- zrek
- · Replies 34 ·
Undergrad Does Dark Matter Fall into Black Holes?
- Godot_
- · Replies 12 ·
Undergrad Surface Differential Rotation by measuring the position of sunspots
- TheSpectacularSpecs
- · Replies 1 ·
Graduate Which galaxies have the best studied evidence for dark matter?
- timjdoom
- · Replies 4 ·
Undergrad Where does the Sol system lie in the cross-section of the Orion Spur?
- AotrsCommander
- · Replies 2 ·
Stargazing Spotting Meteorites: Unveiling the Mystery of Annual Showers
- sophiecentaur
- · Replies 50 ·
Undergrad How Does Gravity Affect Spectral Line Strength?
- Angela G
- · Replies 2 ·
Undergrad Back of the envelope estimate, energy flow in a box of plasma
- Spinnor
- · Replies 1 ·
Graduate Graceful exit of a cosmological inflation model
- Alpha2021
- · Replies 3 ·
Undergrad What causes the precession of the equinox?
- Trying2Learn
- · Replies 7 ·
High School Is the Earth falling into the sun from gravity?
- BadgerBadger92
- · Replies 7 ·
Undergrad Universe Expansion: Does Less Dense Mean Boundaries?
- MagneticMagic
- · Replies 4 ·
Undergrad What does the equation dΩ32 = dr2 + r2dΩ22 mean in terms of flat space?
- knowwhatyoudontknow
- · Replies 6 ·
Undergrad Impact on Earth: Calculating Energy
- mukuruku
- · Replies 2 ·
High School The configuration of galaxies in space
- PainterGuy
- · Replies 4 ·
High School What Function Does Dark Matter or Energy Serve?
- Zeal Faust
- · Replies 13 ·
High School Different stars visible from northern and southern hemispheres
- PainterGuy
- · Replies 9 ·
High School For object 3.26 million light-years away, light redshifted by 70 km/s
- PainterGuy
- · Replies 12 ·
Undergrad Are Two Supermassive Black Holes on a Collision Course?
- Tom.G
- · Replies 2 ·
Graduate Numerically solving Scalar field coupled to Friedman equation
- Soony143
- · Replies 3 ·
Stargazing Upcoming Supernova? | Nature News
- Oldman too
- · Replies 4 ·
High School How could something that is infinite (the Universe) expand?
- alae
- · Replies 30 ·
High School Revealing Secrets of Distant Supernova DES16C2nm: 10.5 Billion Years Ago
- Ziang
- · Replies 69 ·
High School Light and the black matter (Dark Matter)
- angela
- · Replies 2 ·
High School Asteroid/Near Earth object mining
- 1oldman2
- · Replies 146 ·
High School Questions about Lagrange points in the Pluto / Charon system
- Cerenkov
- · Replies 2 ·
High School What does the Universe exapand into?
- HG009
- · Replies 27 ·
High School Alcyoneus Radio Galaxy: Myth or Reality? Discover the Truth Here!
- MikeC111
- · Replies 2 ·
Undergrad Energy conservation in Doppler (NOT cosmological) redshifts?
- Amaterasu21
- · Replies 13 ·
Undergrad Calculating the probability that the Universe is finite
- Buzz Bloom
- · Replies 70 ·
Undergrad Why does Webb orbit L2, is it because of the Moon?
- bland
- · Replies 58 ·
Undergrad How to Experimentally Measure the MTF of a Lens?
- Gifty01
- · Replies 1 ·
High School NGC 4590, more than 1,400 stars found in various evolutionary stages
- Astronuc
- · Replies 1 ·
Undergrad Radioactive Dating of Asteroid Elements: How Do Scientists Know?
- Albertgauss
- · Replies 2 ·
Undergrad What Are the Theories Behind the Moon's Formation?
- HG009
- · Replies 15 ·
Undergrad What if the Universe expands faster than the speed of light?
- peterraymond
- · Replies 19 ·
High School I wonder why massive objects slow down time
- HG009
- · Replies 7 ·