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
Graduate What do people think about the multiverse concept?
- jnbp13
- · Replies 7 ·
High School How High is Space? Astronomy Facts
- !Jon Snow!
- · Replies 3 ·
Graduate Does the Universe Exist if We're Not Looking?
- !Jon Snow!
- · Replies 7 ·
Graduate NFW Dark Matter Halos and Virial Radius
- zephyr5050
- · Replies 3 ·
Graduate Possible for the Big Bang to have come from The Universe before it?
- shukujo
- · Replies 13 ·
High School Are we looking at a galactic arm or the center when viewing the Milky Way?
- kmm
- · Replies 12 ·
Stargazing Is a Telescope Worth Buying for Limited Sky Visibility?
- Phycisists
- · Replies 20 ·
Graduate Light propagates faster than the rate of expansion of the universe?
- iDimension
- · Replies 4 ·
Graduate What is the mass and equatorial radius of the Crab Pulsar?
- zyxwv99
- · Replies 2 ·
Graduate What Are the Biggest Questions About the Big Bang and the Universe?
- Slacker7
- · Replies 2 ·
Graduate Where to Begin Coding for Smoothed Particle Hydrodynamics Simulations?
- Artemisia
- · Replies 2 ·
Undergrad Do two masses gravitate to their centre of mass
- jja
- · Replies 2 ·
Graduate Fate of outer planets after sun ends its life cycle
- gfd43tg
- · Replies 17 ·
Stunning Summer Vacation Photos: Starry Skies, Thunderstorms, and Perfect Waves
- Andy Resnick
- · Replies 4 ·
Undergrad Water Clouds Tentatively Detected Just 7 Light-Years from Earth
- CygnusX-1
- · Replies 1 ·
Graduate Estimating the age of the universe not knowing its size?
- Gerinski
- · Replies 7 ·
Undergrad Is Zero the Most Ideal Value on a Number Line?
- Bobshark
- · Replies 1 ·
Undergrad The Pleiades Controversy Erupts Again
- CygnusX-1
- · Replies 1 ·
Undergrad Low-eccentricity orbits and the Plane of the Elliptic
- GofG
- · Replies 2 ·
Graduate Chandler wobble: nutation or precession?
- stroustroup
- · Replies 2 ·
Graduate Mass radius relationship for SIRIUS B
- cooper607
- · Replies 5 ·
Graduate Constraints on gravity and dark energy
- Chronos
- · Replies 1 ·
Graduate Gravity Waves and Graceful Exit
- enorbet
- · Replies 5 ·
Undergrad Resources for star evolution data and chemical composition
- nick1o2
- · Replies 4 ·
High School Measuring the current Longitude and Latitude of your current position
- Philosophaie
- · Replies 1 ·
Graduate Universe Expansion: Is Merging Possible?
- starligh98
- · Replies 5 ·
Graduate Misalignment of angular momentum of stars (simulation)
- shadi612
- · Replies 1 ·
Graduate Could quantum foam at Planck scales create a universe-destroying bubble?
- djamie
- · Replies 9 ·
Graduate What happens to the gravitational energy of a cooling brown dwarf galaxy?
- wolram
- · Replies 4 ·
Graduate Do photons' gravitational effects account for dark matter and dark energy?
- backenvelope
- · Replies 2 ·
Graduate How are solar particle events predicted? And related to flares/CMEs?
- martiandawn
- · Replies 3 ·
Graduate Does the zero-energy universe account for electrical potential energy?
- DiracPool
- · Replies 3 ·
Undergrad Map or a Listing of All the Constellation Boundaries in Right Ascensio
- Philosophaie
- · Replies 2 ·
Graduate How many dimensions are there to space time?
- Cyber Space
- · Replies 10 ·
Undergrad Expanding universe, big bang question
- deadcat
- · Replies 7 ·
Graduate Why does a photon lose energy to cosmic redshift without interacting with anything?
- vinven7
- · Replies 14 ·
Graduate Is 16.4 GHz a Significant Frequency in Radio Astronomy?
- neilparker62
- · Replies 8 ·
Undergrad Calculate Area of Ellipse in Keplerian Orbit
- cptolemy
- · Replies 4 ·
Graduate Do age and size calculations for the universe use different parameters?
- Jozsef
- · Replies 19 ·
Graduate Expansion by doppler (red) shift
- Mike x10-35
- · Replies 11 ·
Graduate How close would a Type Ia supernova need to be to cause extinction via gamma ray burst?
- TimeHorse
- · Replies 6 ·
Graduate Does Gravitational Time Dilation Impact Cosmological Age Estimates?
- pforeman
- · Replies 15 ·
Graduate What Are the Community's Theories on Dark Matter?
- deadcat
- · Replies 6 ·
High School Can Astronomers Predict when a star will explode?
- !Jon Snow!
- · Replies 4 ·
Graduate The big crunch effect on entropy and time
- blakej
- · Replies 1 ·
Graduate Why does dark energy exist if early expansion was naturally faster?
- exDark
- · Replies 9 ·
High School Is it true that if two pieces of metal touch in space
- !Jon Snow!
- · Replies 3 ·
Graduate Can Dark Matter Radiate Heat or Form Black Holes?
- !Jon Snow!
- · Replies 7 ·
Graduate Dark Matter. Space-Time curvature. Galaxy formation
- Joshuacan
- · Replies 22 ·
Undergrad Is a black hole black from all directions?
- !Jon Snow!
- · Replies 5 ·
Graduate Can the universe be both infinite AND expanding
- Silvers931
- · Replies 2 ·
Undergrad Why do all the planets orbit in the same plane?
- QEDrpf33
- · Replies 25 ·
Graduate As I Was Looking At A Strange Black Hole Image I Wondered
- Kenton
- · Replies 8 ·
Undergrad Can Gas Giants' Atmospheres Ignite Without Oxygen?
- SatSat
- · Replies 2 ·
High School Would Earth leave its orbit immediately if the sun disappeared?
- ketanco
- · Replies 8 ·
Undergrad Geocenteric Equatorial Coordinates of the Sun
- cp11
- · Replies 1 ·
High School How bright was the Chelyabinsk meteor strike?
- TumblingDice
- · Replies 6 ·
Graduate True map of universe from computer simulation with CMB initial state
- divitWasHere
- · Replies 4 ·
Undergrad Do we live in a black hole(or an white hole)
- dxkiller
- · Replies 6 ·
High School Can a planet have different levels of gravitational pull
- !Jon Snow!
- · Replies 8 ·
Graduate Is there radiation colder than the CMBR?
- Lino
- · Replies 31 ·
Graduate Making new sense of the three-body problem
- victorvmotti
- · Replies 1 ·
Graduate Second moment of mass and energy for a torus using E=mc²
- colinbeaton1
- · Replies 1 ·
Graduate Who Determined the Phase and Period of Epicycles in Greek Astronomy?
- puncheex
- · Replies 3 ·
Graduate Are There Documented Polarities in Comets' Magnetic Fields?
- bitznbitez
- · Replies 1 ·
Graduate Rational ratio of frequencies leads to isolating integral of motion
- victorvmotti
- · Replies 2 ·
Undergrad How do we know the orbits of the planets?
- Droctagonopus
- · Replies 9 ·
Graduate Why is the CMB Visible if Younger Light Sources Are Not Yet Visible?
- connorp
- · Replies 18 ·
Undergrad Creating an equation of a 2D path of an orbit
- beamthegreat
- · Replies 6 ·
Undergrad The Most Distant Star in the Milky Way
- CygnusX-1
- · Replies 7 ·
Undergrad Calculating perfect full moon observation locations and dates
- anorlunda
- · Replies 4 ·
Graduate Our universe may have emerged from a black hole in a higher-dimensiona
- Tanelorn
- · Replies 7 ·
Graduate Conservation of mass and black holes
- soulmartyr
- · Replies 8 ·
Graduate Energy of an Expanding Universe Decreases?
- yogi
- · Replies 19 ·
Graduate Dark matter = ligh energy, Dark Energy = also light energy?
- arnesinnema
- · Replies 16 ·
Undergrad Can humans reach near-light speed in a lifetime with 5G acceleration limits?
- Keith
- · Replies 1 ·
Graduate Unidentified emission line in Galaxy Clusters
- DennisN
- · Replies 4 ·
Graduate Direct detection of dark matter?
- Chronos
- · Replies 9 ·
Graduate Could the big bang have been a white hole?
- AstronomyX
- · Replies 4 ·
Undergrad What is Specific Intensity in Astrophysics?
- shanepitts
- · Replies 12 ·
Stargazing Cleaning corrosion from a 300mm telescope mirror
- BOAS
- · Replies 4 ·
Stargazing What equations do I need to design a truss tube dobsonian telescope?
- Tyrion101
- · Replies 12 ·
Graduate Calculating planetary aspects beyond conjunction with Jean Meeus library
- orbit123
- · Replies 3 ·
Graduate Minkowski Space: Can Objects Have Same World Line?
- VaibhavP
- · Replies 1 ·
Graduate Does matter reach light speed crossing a black hole's event horizon?
- spacecadet11
- · Replies 3 ·
Graduate Calculate Interstellar Rock Orbit in Solar System
- Rohith8193
- · Replies 9 ·
Graduate Origin of Dimensions: Evidence of Order or Big Bang Simultaneity?
- DiracPool
- · Replies 2 ·
Graduate Solar Gravity: Is There Good Data?
- jkg0
- · Replies 4 ·
Graduate Question regarding the universes origin
- Silvers931
- · Replies 11 ·
Undergrad Why does'nt SUN burst like a baloon and collapse?
- gianeshwar
- · Replies 5 ·
Graduate Infinite universe but finite beginning?
- MathiasArendru
- · Replies 37 ·
Graduate Gravitational effect of virtual particles
- trendal
- · Replies 9 ·
High School Scale of the universe if a star was a grain of sand
- pelooyen
- · Replies 5 ·
Graduate Can black hole entropy be observer-dependent?
- enquirealways
- · Replies 30 ·
Graduate How many gravitons are there in the observable universe?
- jimgraber
- · Replies 7 ·
Graduate Variational Principle for Spatially Homogeneous Cosmologies/KK-theory
- center o bass
- · Replies 2 ·
Undergrad Does Aluminum Coating on Telescope Mirrors Turn into Aluminum Oxide?
- anorlunda
- · Replies 3 ·
Graduate What happens to the energy when the universe dies out?
- louisbaron
- · Replies 3 ·
Undergrad Calculating latitude and longitude at any time
- z.js
- · Replies 11 ·
Did Humans Go to the Moon? A Debate
- Hepic
- · Replies 2 ·