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 What would a big crunch look like observationally?
- Jarvis323
- · Replies 4 ·
High School Is there a standard mapping of celestial coordinates to geo-coordinates
- Adam Laceky
- · Replies 7 ·
High School How to explain "the right hand rule" to an alien universe
- Rap
- · Replies 15 ·
High School Question about Preventing Tidal Locking around Red Dwarf Stars
- Althistorybuff
- · Replies 2 ·
High School Convection in Stars: The Role of Mass and Structure in Fuel Consumption
- Xforce
- · Replies 16 ·
Undergrad Exponential expansion and the Cosmological Constant
- Ranku
- · Replies 7 ·
High School What Drives the Gravitational Waves in Black Hole Ringdown?
- Lord Crc
- · Replies 13 ·
Graduate How deep in a gravitational well are we?
- Agerhell
- · Replies 3 ·
Undergrad Imaging galaxies receding at a velocity that exceeds c?
- hyksos
- · Replies 12 ·
High School Red Dwarf Stars - Planet Habitability around "Flare Stars"
- Althistorybuff
- · Replies 1 ·
High School Does being tidally locked affect a planet's magnetic field?
- Althistorybuff
- · Replies 2 ·
High School Did anyone actually see the space moving faster than light?
- fbs7
- · Replies 24 ·
High School What is the most common/likely process of the Universe?
- Tap Banister
- · Replies 7 ·
Undergrad The use of 3D reconstruction techniques to build a galaxy model
- sbleuz
- · Replies 4 ·
Undergrad Will There Be a Solar System Navigation System for Space Travel?
- happyhacker
- · Replies 4 ·
Graduate Covariance matrix size: 3x3 or 4x4?
- fab13
- · Replies 5 ·
Undergrad Isn't planetary rock dating really supernova dating?
- swampwiz
- · Replies 5 ·
High School How Do High-Speed Objects Traverse High-Temperature Gaseous Nebulas?
- pedro the swift
- · Replies 3 ·
High School Can black holes truly be infinite?
- Dan4
- · Replies 6 ·
Graduate CMB as thermal radiation of cosmic dust?
- Vaclav Vavrycuk
- · Replies 8 ·
Undergrad How does Hawking radiation contribute to the formation of new stars?
- Cheng Fan Soon
- · Replies 28 ·
Graduate Where to Find the Best Records of Past Supernova Events
- Jarvis323
- · Replies 1 ·
Graduate Classical scalar field as Dark Matter
- fhenryco
- · Replies 14 ·
Undergrad Fine tuning and the multiverse
- John Oats
- · Replies 6 ·
Undergrad Is Bad Astronomy Using Bad Statistics?
- Vanadium 50
- · Replies 16 ·
High School Could singularities be just rips in the space-time fabric?
- Mlesnita Daniel
- · Replies 23 ·
Undergrad Debunking the Moon Landing Conspiracy Theories: Evidence and Explanations
- Nick tringali
- · Replies 3 ·
High School Previous thoughts on destroying asteroids were wrong: Nuking them is a bad idea
- Mlesnita Daniel
- · Replies 10 ·
Graduate Cosmological fluctuations (Weinberg's cosmology, p. 284)
- jouvelot
- · Replies 10 ·
Undergrad A very small object following Earth in the same orbit
- Michaela SJ
- · Replies 9 ·
Undergrad Would we know if the Milky Way were a quasar?
- swampwiz
- · Replies 8 ·
High School Black Holes: Observing & Understanding | Astrophysics
- Clay Bartlett
- · Replies 3 ·
High School If Quark stars exist why do Neutron stars become Black holes?
- wolram
- · Replies 17 ·
High School What is the 'proof' of the no-hair theorem of black holes?
- Cerenkov
- · Replies 5 ·
Stargazing Accelerating universe - luminosity data
- Bosko
- · Replies 2 ·
Undergrad How Do We Determine the Sun's Generation?
- hkyriazi
- · Replies 6 ·
High School CMBR: Is It Constant or Changing Over Time?
- Bill McKeeman
- · Replies 2 ·
High School For Lack of a Better Term....Moon Motion
- Atari_Me
- · Replies 18 ·
Graduate Continuous Field Image: Hubble Deep Field & Exoplanets
- vinven7
- · Replies 5 ·
Undergrad Cross-correlations: what size to select for the matrix?
- fab13
- · Replies 4 ·
High School How far back can we see with light?
- wolram
- · Replies 1 ·
High School Questions regarding energy in the universe
- Brunolem33
- · Replies 3 ·
High School Question about time and its relation to spacetime
- Nadeen
- · Replies 9 ·
Graduate Dark matter and the fabric of space time,
- Mike Bristow
- · Replies 2 ·
Undergrad Is Tabby's Star Dimming Due to an Alien Megastructure?
- zuz
- · Replies 12 ·
High School Which Hawking paper? (no singularity at the beginning of the universe)
- Cerenkov
- · Replies 2 ·
Graduate Is "Broken Symmetry" truly foundational?
- Eugene Ulrich
- · Replies 4 ·
High School Photon Decoupling: Effects on Universe Expansion
- Adhruth Ganesh
- · Replies 2 ·
Graduate Decoupling of SVT Metric Perturbations
- Zag
- · Replies 2 ·
High School Help with when expansion acceleration began
- Rodney-Believes
- · Replies 23 ·
Undergrad How is Dark Matter distributed around our galaxy?
- KurtLudwig
- · Replies 6 ·
Undergrad Confusion about absorption spectra - cool gases absorb?
- Cool4Kat
- · Replies 17 ·
High School Can a single photon make up a universe?
- sgphysics
- · Replies 1 ·
Undergrad What is the pressure gradient towards the centre of a large planet?
- kevindin
- · Replies 4 ·
Undergrad Why ##\omega=0## for a matter dominated universe?
- Apashanka
- · Replies 4 ·
Undergrad Is a "collision" of galaxies noticeable on a planetary scale
- maxjon77
- · Replies 3 ·
Undergrad Expansion of positively and negatively curved universe
- Apashanka
- · Replies 2 ·
Undergrad Variable Dark Energy: Would P Remain Constant?
- Ranku
- · Replies 17 ·
Undergrad Humanity: Master fusion reactors or build a dyson sphere?
- Luke Geller
- · Replies 1 ·
Undergrad Is Something Missing in the Expansion of Our Flat Universe?
- Apashanka
- · Replies 17 ·
Undergrad Too Much Dark Matter In CEG Mrk 1216
- ohwilleke
- · Replies 2 ·
High School What Happens at the Event Horizon of a Black Hole?
- Steve1954
- · Replies 5 ·
Undergrad How would the DSG orbit the Moon?
- happyhacker
- · Replies 1 ·
Undergrad Two gravitational events might be a single lensed one
- mfb
- · Replies 8 ·
High School Andromeda Collision VS Expansion
- newrd
- · Replies 3 ·
Undergrad Space docking using the Meissner effect
- YoungPhysicist
- · Replies 3 ·
Undergrad Expanding universe or tired light in a static universe?
- Ennio
- · Replies 6 ·
Undergrad New Problems I have with Dark Matter
- neonred
- · Replies 13 ·
Undergrad What Is the Singularity and Its Role in the Big Bang?
- Michaela SJ
- · Replies 26 ·
Stargazing Stellar Eclipse on Feb 18/19, 2019
- OmCheeto
- · Replies 1 ·
High School Is the Rover Mission Halted Due to Dust-Covered Solar Panels?
- hagopbul
- · Replies 11 ·
New Horizons flyby of Pluto [updated for Ultima Thule]
- rootone
- · Replies 192 ·
Undergrad Difference between dark energy and dark matter
- Apashanka
- · Replies 6 ·
Undergrad How Does the Sun's Position Affect the Earth-Moon Barycenter?
- bunburryist
- · Replies 4 ·
High School How exactly inflation solves the Horizon Problem
- Arman777
- · Replies 13 ·
Undergrad Relative Amount of Hydrogen in the Universe
- Jim Lundquist
- · Replies 8 ·
Undergrad Galaxy at z=11.1, farthest yet, unusually bright (GN-z11)
- marcus
- · Replies 16 ·
High School How hard is it to track moon cycles
- SNOUSSI Anis
- · Replies 28 ·
Undergrad Inflation resolves the horizon problem
- Apashanka
- · Replies 7 ·
Undergrad Why Do Stars and Hot Metal Show Different Colors at Similar Temperatures?
- bruha
- · Replies 10 ·
Graduate Dark matter and spacetime metric
- Angelika10
- · Replies 8 ·
High School Naked Singularity, Black hole mass limit
- Arman777
- · Replies 12 ·
Undergrad Supermassive singularity the cause of the Big Bang?
- Marcus Gross
- · Replies 32 ·
Undergrad The Universe as an isolated system
- Trust10
- · Replies 27 ·
High School The unusual motion of stars in galaxies
- Wallsy
- · Replies 6 ·
Undergrad Dark energy and the rotation curve of spiral galaxies
- Apashanka
- · Replies 1 ·
High School Active galaxies point to new physics of cosmic expansion
- wolram
- · Replies 2 ·
Undergrad Does all orbiting space debris eventually fall and why?
- Jonathan212
- · Replies 5 ·
Undergrad Inflation and the size of the Universe
- Ranku
- · Replies 9 ·
Stargazing Potential Impact of Meteoroid During Lunar Eclipse on January 21, 2019
- russ_watters
- · Replies 31 ·
Undergrad Understanding the Impact of Solar Radiation and Eccentricity on Earth's Climate
- QuarkDecay
- · Replies 5 ·
Undergrad Why Are Star Spectra Shown as Absorption Rather Than Emission?
- nmsurobert
- · Replies 3 ·
Graduate Unveiling the Structure of Sagittarius A*: First VLBI Image at 86 GHz with ALMA
- Auto-Didact
- · Replies 3 ·
Graduate Schrödinger Evolution of Self-Gravitating Disks
- Auto-Didact
- · Replies 1 ·
Undergrad Why hasn't the Oort cloud converged to a disk shape?
- Jonathan212
- · Replies 33 ·
Undergrad What is the Hubble Parameter over time and how can I calculate it?
- Arman777
- · Replies 2 ·
Undergrad Luminosity Distance: Finding the Connection
- Apashanka
- · Replies 15 ·
Stargazing Seeing star light -- Why does it take so long?
- Don H
- · Replies 19 ·
High School Algebraic Topology in the tv show The Big Bang Theory
- tylerfarzam
- · Replies 11 ·
High School Galaxy rotational curves vs time
- Daniel Dimov
- · Replies 9 ·