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 Have we measured the change in the red shift over time?
- Justin Hunt
- · Replies 3 ·
High School How long will the universe last before the last black hole evaporates?
- Jimmy87
- · Replies 28 ·
Undergrad Perceived Speed of Objects in Space
- krs1
- · Replies 5 ·
Stargazing What Causes the NEQ6 Pro Mount to Have 'Brain Failure' During Alignment?
- sophiecentaur
- · Replies 4 ·
Undergrad V774104 sednoid with no publicly determined orbit
- nikkkom
- · Replies 8 ·
Undergrad Conservation of Energy on the Cosmological Scale
- Islam Hassan
- · Replies 2 ·
Undergrad Andromeda and the cosmological redshift
- nmsurobert
- · Replies 28 ·
Stargazing Where did oxygen come from? Stars or something else?
- Morlaf
- · Replies 21 ·
High School Photon mean free path (regarding CMB black body assumption)
- bahamagreen
- · Replies 7 ·
Undergrad Relationship between stellar mass and core mass?
- bbbl67
- · Replies 7 ·
Undergrad Frequency of nearby Supernova Explosions
- windy miller
- · Replies 13 ·
Undergrad Atmospheric CO2 and diurnal Asymmetry
- johnbbahm
- · Replies 10 ·
Undergrad How can I go about making a "Space Proof" coating?
- Tech2025
- · Replies 3 ·
Undergrad Cosmological Redshift and Heisenberg Uncertainty Principle
- e2m2a
- · Replies 5 ·
High School Did Astronomers Really Think the Milky Way Was the Only Galaxy in 1900?
- Thecla
- · Replies 8 ·
Undergrad On gravity and the conservation of energy
- Catreece
- · Replies 30 ·
Stargazing Zeiss Terra ED 10x42 Binos for stargazing?
- Doc Al
- · Replies 8 ·
High School How Did the Big Bang Happen If the Speed of Light Is a Limit?
- Gondur
- · Replies 13 ·
Undergrad SU(2) invariance implies isotropy?
- JuanC97
- · Replies 7 ·
Graduate What are the typical uncertainties of data in Astophysics?
- Fabioonier
- · Replies 7 ·
Graduate Multiverse reduction in the new Hawking/Hertog model?
- Agrippa
- · Replies 28 ·
High School What is the GZK Cut Off Point and why does it happen?
- TheQuestionGuy14
- · Replies 3 ·
High School Why does a stellar-mass black hole trap light but a star doesn't?
- Tatest
- · Replies 3 ·
High School The Search for a Neutron Star or Black Hole Nearby
- Android17
- · Replies 13 ·
Undergrad Gravitational difference between a black hole and a star
- Ranku
- · Replies 30 ·
Undergrad What distinguishes stars from planets in our solar system?
- A Alex P
- · Replies 10 ·
Undergrad Why do distant supernovae appear dimmer than expected in an accelerating universe?
- exmarine
- · Replies 1 ·
Undergrad Is there a plan for a search for nearby black holes?
- Buzz Bloom
- · Replies 55 ·
Graduate Dark energy = cosmological constant, any problems with that?
- kurros
- · Replies 153 ·
Undergrad Simulated Reality: Proving Our Universe Is Real?
- Trollfaz
- · Replies 5 ·
Undergrad Vertical axis of the CMB power spectrum
- DoobleD
- · Replies 3 ·
Graduate Sufficient conditions for Rayleigh-Taylor instability
- TheCanadian
- · Replies 1 ·
High School Did the Big Bang create space and time?
- Lunct
- · Replies 9 ·
Stargazing Geomagnetic storm expected 15-18 February in high latitudes
- davenn
- · Replies 21 ·
Undergrad Is Jupiter Responsible for the Majority of the Solar System's Angular Momentum?
- fizzy
- · Replies 24 ·
Undergrad What will happen to the Hubble value if dark energy is dynamic and decreasing?
- Ranku
- · Replies 20 ·
Undergrad "Centaurus A Contradicts Dark Matter Models"
- megacal
- · Replies 4 ·
High School How do scientists measure mass, radius, and distance in astronomy?
- A Alex P
- · Replies 5 ·
High School Traveling to Mars and time dilation
- Craftek_Ana
- · Replies 4 ·
High School Mutually orbiting bodies in an isolated universe
- Jens K Munk
- · Replies 10 ·
High School No Imbalance between Matter/AntiMatter
- NebulaBilly
- · Replies 7 ·
Undergrad Colonies on Mars -- fundamental problem
- arupel
- · Replies 47 ·
Undergrad Why is a statistical explanation for Baryon Asymmetry wrong?
- Buzz Bloom
- · Replies 2 ·
Undergrad Is the moon older than the Earth?
- Azurite
- · Replies 20 ·
High School The Universe without Cosmic Inflation?
- Arman777
- · Replies 82 ·
High School Colliding black holes effect on the Richter scale
- jerromyjon
- · Replies 16 ·
Graduate Difference between eclipsing binaries and exoplanets
- A Alex P
- · Replies 24 ·
High School Lack of time dilation in type 1a supernova
- wolram
- · Replies 4 ·
High School How Does the Midnight Sun Occur in the Arctic Region?
- ANAMUL
- · Replies 5 ·
Undergrad Dark matter and old shell theorem
- trouble
- · Replies 4 ·
High School Are the 3 space dimensions "equal"?
- Gerinski
- · Replies 11 ·
Undergrad Data Model of Kepler's Second Law of Planetary Motion
- icecats
- · Replies 1 ·
Stargazing Does a Radio Telescope Have Aberration and How Does it Affect Its Performance?
- Clear Mind
- · Replies 9 ·
Undergrad Does dark matter contribute to my body mass?
- rootone
- · Replies 4 ·
Undergrad Getting the wrong multipole for 1st acoustic peak
- DoobleD
- · Replies 6 ·
Undergrad Why TESS can only find hot Jupiters around bright stars
- Jenab2
- · Replies 2 ·
Graduate Neutron star collisions as a heavy element source
- phyzguy
- · Replies 34 ·
Undergrad Can two planets share the same orbit without catastrophic consequences?
- Rifat amin
- · Replies 26 ·
Undergrad Can black dwarfs exist in the present Universe
- rootone
- · Replies 12 ·
Undergrad Determining the universe's shape and whether exotic geometries are viable
- Hypercube
- · Replies 5 ·
High School Can Friction Create Preferentially Circular Orbits?
- Simon Peach
- · Replies 22 ·
Undergrad How does the distribution of elements change over time?
- BWV
- · Replies 3 ·
Undergrad Will white dwarfs cool down to blue, then yellow, then red?
- swampwiz
- · Replies 9 ·
Undergrad How Does the GAIA Program Count 1.7 Billion Stars in Its Image?
- nmsurobert
- · Replies 4 ·
High School Is an External Force Driving the Acceleration of Universe Expansion?
- DudeWut
- · Replies 8 ·
Undergrad N-body Simulations: Density vs Circular Profiles
- Ranku
- · Replies 3 ·
Graduate This is the most active place in the universe
- Maha odeh
- · Replies 2 ·
Undergrad 10,000 black holes near Sagittarius A ?
- phinds
- · Replies 10 ·
Graduate Using the Sloan Digital Sky Survey to Extract Quasar Spectra and Fit Models
- quasarLie
- · Replies 12 ·
High School Massive Football Field-Sized Asteroid Comes Close to Earth
- Evo
- · Replies 27 ·
High School Number of stars in the universe over time
- BL4CKB0X97
- · Replies 2 ·
Stargazing Movement of Stars seen from the North Pole
- Zarhult
- · Replies 16 ·
High School Are heliocentrism and geocentrism both correct?
- larry909
- · Replies 6 ·
Undergrad What is the relationship between gravity and density?
- muneer Mohsen samih
- · Replies 13 ·
Undergrad Why Is Convection Efficient in the Outer Layers of Stars?
- mjda
- · Replies 2 ·
Undergrad How does one actually compute a correlation function?
- BOAS
- · Replies 10 ·
Undergrad Calculating the incidence angle of the Sun
- jones123
- · Replies 1 ·
Undergrad Stellar Thermal Energy with no Nuclear source
- mjda
- · Replies 13 ·
Undergrad Observational evidence against expanding universe in MNRAS
- elerner
- · Replies 141 ·
High School Orbit circularisation/insertion spreadsheet
- Treva31
- · Replies 15 ·
High School Is the Asteroid Belt's Shape Misrepresented?
- DaveC426913
- · Replies 2 ·
High School How dense was the first starfield we might have seen?
- Grinkle
- · Replies 10 ·
Undergrad Source of the weather on Neptune
- ryan liberty
- · Replies 2 ·
High School What is the Earth's path in relation to the sun and the expanding universe?
- simon willetts
- · Replies 12 ·
Undergrad Origin of the half factor in Euler-Lagrange for geodesics
- Alex Petrosyan
- · Replies 2 ·
Undergrad The deviation of Universe expansion from general relativity
- consuli
- · Replies 22 ·
Undergrad Who will discover dark matter first?
- infinitebubble
- · Replies 25 ·
Undergrad How to describe the Sun's interior?
- mjda
- · Replies 43 ·
High School What fraction of the matter in the universe is in black holes?
- ohwilleke
- · Replies 15 ·
High School Is the Milky Way the same as 'The Galaxy'?
- Lukeblackhill
- · Replies 25 ·
High School Basic rule for Atmospheric Reentry of Glider Class vehicles
- Laurie K
- · Replies 12 ·
High School Density of matter at a galactic center
- Ranku
- · Replies 6 ·
Undergrad Expanding math space implies expanding space?
- negativzero
- · Replies 4 ·
High School Does Hubble's Law imply that galaxies are accelerating away
- Elorm Avevor
- · Replies 5 ·
Graduate Comoving distance, causality volume and entropy
- Xkcd
- · Replies 1 ·
High School Using Venus in the Parker Solar Probe mission
- sophiecentaur
- · Replies 5 ·
Undergrad Where are the Constants of Nature stored in Multiverse?
- jtlz
- · Replies 11 ·
Undergrad Milky way arms and the position of the Earth
- nmsurobert
- · Replies 2 ·
Graduate Where can I find a text about heavy elements migration?
- Guilherme Franco
- · Replies 3 ·
Super blue blood moon visibility in January 2018
- lekh2003
- · Replies 45 ·