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
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 ·
Graduate Planck 2015 CMB temperature individual pixel variance
- tjsotherone
- · Replies 6 ·
Undergrad What it takes to start a space exploration company?
- Prof Sabi
- · Replies 2 ·
Stargazing Solar eclipse on February 15, 2018
- Space_Girl
- · Replies 6 ·
High School Why did our universe come from nothing instead of something else?
- RajeshR
- · Replies 41 ·
Undergrad Continuous Lensing Models: Discrete Data
- BOAS
- · Replies 1 ·
Undergrad Changing the ISS's orbital inclination to match the Moon
- Alec Dacyczyn
- · Replies 4 ·
Undergrad Which lunar pole is better for mining, moonbase, and solar power?
- Al_
- · Replies 33 ·
Undergrad What is the New White Dwarf Mass Limit?
- |Glitch|
- · Replies 9 ·
High School Could we launch spaceships from a long horizontal ramp?
- Martin Peasha
- · Replies 2 ·
High School Why are aurora always in the vicinity of Earth's poles?
- al33
- · Replies 2 ·
High School Adding a huge electric charge to a black hole?
- Go Nucelar
- · Replies 42 ·
High School Is cosmopsychism theory just babble copied from The Force?
- swampwiz
- · Replies 1 ·
High School Scattering of light in a strange fashion
- Afina
- · Replies 2 ·
Undergrad Mass in the early universe and the CCC model
- windy miller
- · Replies 15 ·
Undergrad How are protostars detected in images?
- nmsurobert
- · Replies 6 ·
High School Light spectrum of planet Earth as seen from space
- William LL
- · Replies 3 ·
Undergrad Extragalactic Planets Observed Using Microlensing
- jim mcnamara
- · Replies 3 ·
High School The Universe vs Observable Universe
- Tangent87
- · Replies 29 ·
Undergrad Orbit simulations, tidal forces and planetary oblateness
- madsmh
- · Replies 10 ·
Undergrad What Are the Best Academic Journals for Aspiring Planetary Scientists?
- astrogato96
- · Replies 5 ·
High School Is blue shift as common as red shift?
- BL4CKB0X97
- · Replies 26 ·
High School If the moon were a light bulb how many watts would it be.
- zdcyclops
- · Replies 13 ·
High School The Moon's inclination to Earth's equator
- jordankonisky
- · Replies 3 ·
High School Tonight's full moon and lunar eclipse
- Charles Link
- · Replies 11 ·
High School How Can Astronomy Even Occur? (Oort Cloud)
- Carpe Physicum
- · Replies 35 ·
Graduate Can a 3d holographic universe exist in 3d?
- Suekdccia
- · Replies 1 ·
High School MPEG movie: traveling to a black hole or a neutron star
- Arman777
- · Replies 1 ·
High School Can Star Wars-like asteroid storms exist?
- GTOM
- · Replies 1 ·
High School What would temperatures look like from the singularity of a 25 solar mass black hole?
- DiscoProJoe
- · Replies 13 ·
High School Why does color temperature differ from effective temperature for different star types?
- heavystray
- · Replies 2 ·
Undergrad Question regarding Evaporation of galaxies
- Buzz Bloom
- · Replies 4 ·
Undergrad Star Gravitational Binding Energy Questions
- Assaltwaffle
- · Replies 8 ·
High School Why Do We Use Different Pairs of Filters to Determine the Temperature of Stars?
- heavystray
- · Replies 5 ·
High School Are black holes infinitely dense?
- Aliam1
- · Replies 6 ·
High School Temperature based on colour index using Planck's law
- heavystray
- · Replies 4 ·
Undergrad Is it possible to stretch a singularity?
- Darkmisc
- · Replies 6 ·
High School Is the starshade going to be positioned in a fixed location?
- roineust
- · Replies 7 ·
Undergrad Type Ia supernova involving binary white dwarfs?
- bbbl67
- · Replies 8 ·
Graduate Could Dark Matter be H or He? They are pervasive
- David Roberts
- · Replies 11 ·
Graduate Why don't primordial black holes couple to the baryon-photon fluid in the radiative era?
- fhenryco
- · Replies 10 ·
High School Unusual object on video - any explanation?
- MulderFBI
- · Replies 3 ·
Graduate Are our equations for this universe valid in all universes?
- cosmicalset
- · Replies 5 ·
Undergrad Some confusion about Kepler’s formula
- JohnnyGui
- · Replies 11 ·
Undergrad Deriving the Cosmological Constant
- Arman777
- · Replies 13 ·
High School Wonder-inducing ring galaxy image
- jim mcnamara
- · Replies 5 ·
High School Time dilation at near-light speeds for a trip to Andromeda
- The Grassy Knoll
- · Replies 7 ·
High School Is additional maths essential for astronomy?
- ZiHao
- · Replies 2 ·
High School Why is there something rather than nothing?
- alan123hk
- · Replies 2 ·
Undergrad I use an Olll filter to view emission nebula -- how do they work?
- jordankonisky
- · Replies 1 ·
Undergrad Topology of the Universe and infinities
- Arman777
- · Replies 13 ·
Undergrad Could it have been the Big Leak and not the Big Bang?
- Robert P
- · Replies 26 ·
Undergrad Moon vs Earth for launch to Mars
- Rednecknav
- · Replies 98 ·
Should We Develop a Unique Terminology for Alien Lifeforms?
- r8chard
- · Replies 31 ·
High School Gravastar vs. Neutron Stars: A New Theory for Black Hole Formation?
- darkmattermonkey
- · Replies 4 ·
Graduate Zenith and nadir orientation on the celestial sphere
- starstruck_
- · Replies 7 ·
Undergrad Why do very hot and cool stars show weak hydrogen lines?
- nmsurobert
- · Replies 9 ·
Undergrad If the universe is infinite in size, did the Big Bang still happen?
- abbott287
- · Replies 73 ·
Graduate How can the universe keep on expanding if it's infinite?
- Aarav Sangar
- · Replies 4 ·
Stargazing INTEY 70mm telescope for beginners
- Hawksteinman
- · Replies 10 ·
Undergrad How do CTCs allow a universe to self-create?
- relatively-uncertain
- · Replies 3 ·
High School What is the highest redshift (Z number) a galaxy can have?
- wolram
- · Replies 5 ·
Insights A Journey Into the Cosmos - FLRW Metric and The Friedmann Equation - Comments
- Arman777
- · Replies 0 ·
Undergrad Were all these exoplanets a surprise?
- sophiecentaur
- · Replies 6 ·
Graduate Could vacuum decay fundamentally change our universe?
- Suekdccia
- · Replies 5 ·
High School Could Oumuamua be an alien spacecraft?
- lifeonmercury
- · Replies 25 ·
High School How did Jupiter and Saturn disrupt our solar system
- wolram
- · Replies 6 ·
High School Can we identify the centre of the Universe?
- jefsART
- · Replies 97 ·
Undergrad Can anyone tell me if 2009 MS9 is prograde or retrograde?
- Edward Barrow
- · Replies 3 ·
Undergrad Origin of supermassive blackholes in the very early universe
- tuantle
- · Replies 12 ·
Undergrad Are Stars Absorbing and Re-Emitting Radiation from Space?
- nmsurobert
- · Replies 1 ·
Undergrad Why wasn't Oumuamua detected before October 2017?
- roineust
- · Replies 86 ·
Undergrad Is Tabby's Star a Binary System or an Alien Megastructure?
- fizzy
- · Replies 22 ·
High School Cassini's topographic map of Titan reveals liquid flows
- wolram
- · Replies 7 ·
Graduate Does the event horizon coincide with a black hole's physical surface?
- Philippos
- · Replies 15 ·
Insights Coordinate Dependent Statements in an Expanding Universe - Comments
- Orodruin
- · Replies 2 ·
High School How thick is the Milky Way disk?
- Suyash Singh
- · Replies 1 ·
Undergrad Update on liquid water on Mars - maybe it is sand?
- mfb
- · Replies 12 ·
High School What was matter like during the GUT and Electroweak Epochs?
- Comradez
- · Replies 17 ·
Undergrad Why do different cosmological models fit the same experimental data?
- marie
- · Replies 3 ·
High School History of RA [why is the vernal equinox used?]
- nearc
- · Replies 5 ·
Undergrad Does space expansion weaken gravity and the strong force?
- Paul Howard A
- · Replies 24 ·
Undergrad How do we distinguish cosmological redshift from Doppler redshift in observations?
- exmarine
- · Replies 24 ·
Stargazing The League of Extraordinarily BIG Telescopes
- OmCheeto
- · Replies 8 ·
High School Is a Black Hole Really Waterproof?
- Ozfer
- · Replies 2 ·
Graduate The unsolved engineering of the "Space Ladder"
- Lorzazu
- · Replies 25 ·
Undergrad How Does Einstein's Curvature of Space Affect Celestial Orbits?
- nnkl
- · Replies 2 ·
High School From where is the universe expanding?
- Odette
- · Replies 5 ·
Undergrad What Values Can Ωk Take in the Equation Ωm+Ωr+Ωk=1?
- Arman777
- · Replies 5 ·
Undergrad Calculating signal to noise ratio for deimos data
- Curtnos
- · Replies 3 ·
Undergrad JPL Ephemeris Files: Calculating Heliocentric Pos. of Mars
- cptolemy
- · Replies 1 ·
Stargazing Astounding Moon Astro Photos: Capturing the Beauty of Our Celestial Neighbor
- davenn
- · Replies 5 ·
Undergrad Energy needed to move space debris to L2 or L4/L5
- Rednecknav
- · Replies 15 ·
Undergrad Observable Universe Tempature and CMB
- Arman777
- · Replies 11 ·
Undergrad What Does Redshift and Scale Factor Tell Us About the Size of the Universe?
- Arman777
- · Replies 8 ·
Undergrad What's the effect of solar pole reversal on the Parker Spiral?
- Sanborn Chase
- · Replies 3 ·