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
High School Are all galaxies moving away from the Milky Way?
- Pbody101
- · Replies 16 ·
High School Can a true vacuum exist if gravitons cannot be shielded?
- Delta2
- · Replies 32 ·
High School Thickness & Distance of Milky Way at Sun's Location
- lifeonmercury
- · Replies 3 ·
High School Are black holes white or monochromatic?
- newjerseyrunner
- · Replies 3 ·
Graduate Philosophy of a Mathematical Multiverse
- FallenApple
- · Replies 1 ·
Undergrad How did scientists figure out the expansion is accelerating?
- resurgance2001
- · Replies 1 ·
Undergrad Is the Cosmic Void Between Galaxies Truly Empty?
- Mohd Abdullah
- · Replies 6 ·
High School How can we create a map of the universe?
- Andrew Whalen
- · Replies 19 ·
High School Height measurement on other planets
- Gustav S
- · Replies 1 ·
Graduate Can white dwarf density be reproduced in a lab, and what form of matter are they?
- K. Doc Holiday
- · Replies 2 ·
Stargazing Researching AN Ursae Majoris B for Supernova Possibilities
- K. Doc Holiday
- · Replies 2 ·
High School Luminosity and neutrino questions
- K. Doc Holiday
- · Replies 8 ·
Stargazing Bright stationary light with flashing lights in the night sky
- jane ellis
- · Replies 12 ·
High School Can we detect ancient EMR attenuation from before the recombination epoch?
- stoomart
- · Replies 10 ·
High School Re-evaluating Dark Matter and Kepler's Law in Spiral Galaxies
- Trenton
- · Replies 3 ·
Undergrad How can gravity hold galaxy groups togehter?
- Tryggvas
- · Replies 5 ·
High School Retrograde star orbits in the Milky Way
- lifeonmercury
- · Replies 15 ·
Stargazing Where Is the Hubble Telescope in Orbit?
- lifeonmercury
- · Replies 8 ·
High School Beyond the standard model through 'mini spirals'
- wolram
- · Replies 2 ·
High School Is Weak Gravitational Lensing Enough Evidence to Confirm Dark Matter?
- wolram
- · Replies 2 ·
Undergrad Nebulosity around Pleiades stars
- virgil1612
- · Replies 2 ·
High School What is the link between ordinary and dark matter?
- Dee Flont
- · Replies 5 ·
High School Gravity waves and density perturbations
- Discman
- · Replies 9 ·
High School Quantisation of light and Doppler effect
- Vibin Narayanan
- · Replies 4 ·
High School Will Voyager 2 Pass Sirius While Orbiting the Milky Way?
- lifeonmercury
- · Replies 3 ·
Undergrad If there is life on Mars should people stay home?
- BWV
- · Replies 17 ·
Stargazing Supermoon on 14 December
- davenn
- · Replies 1 ·
High School Weird quantum property of empty space?
- wolram
- · Replies 2 ·
High School Research Ideas For High School Student (Astrophysics/Cosmology)
- Quds Akbar
- · Replies 12 ·
Undergrad Inflation and expansion of the universe
- phtdegroot
- · Replies 1 ·
High School Cosmological constant vis-a-vis dynamical vacuum: bold challenging the ΛCDM
- wolram
- · Replies 5 ·
Undergrad Why is dark matter accepted over modified gravity theories?
- Pedraam
- · Replies 13 ·
Undergrad How big and how old is the Universe?
- wwoollyyhheeaa
- · Replies 35 ·
High School Is the Cosmological Red Shift Evidence of Time Slowing Down?
- Bill69
- · Replies 16 ·
High School Are inflatons the same as fewer gravitons?
- Pjpic
- · Replies 1 ·
High School The Semi-Major Axis of Binary Stars
- Tom MS
- · Replies 4 ·
Undergrad Percent of stars in our galaxy that belong to clusters?
- Abdul.119
- · Replies 2 ·
High School Can we use technology to view the past through stars?
- Hena Adlakha
- · Replies 3 ·
Graduate What is the Current Status of Cyclic Cosmology and its Relation to M-Theory?
- Jim
- · Replies 2 ·
Undergrad Can the information of the whole universe change?
- friend
- · Replies 3 ·
Undergrad Calculating the mass of a galaxy bulge
- Jules Winnfield
- · Replies 1 ·
High School Neutron Stars and Angular Momentum
- lavinia
- · Replies 26 ·
Undergrad Why are craters on the Moon nearly all circular?
- sophiecentaur
- · Replies 16 ·
High School Is the smooth dark matter deBroglie's subquantic medium?
- Dee Flont
- · Replies 16 ·
Undergrad How do I compare a model to logarithmic data?
- Jules Winnfield
- · Replies 3 ·
High School Trying to study the major constellations
- lifeonmercury
- · Replies 5 ·
Undergrad How is the arrow of time defined?
- hailzeyy
- · Replies 52 ·
High School Mass of Sun/stars (elemental/molecular vs. plasma)
- hollowman
- · Replies 6 ·
High School So I don't understand moon eclipses
- farolero
- · Replies 22 ·
Graduate Gravitational waves in warm inflation
- shinobi20
- · Replies 3 ·
Undergrad Scale of a in MOND and cosmological constant
- kodama
- · Replies 2 ·
Stargazing Can Pluto be seen with amateur telescopes?
- Andy Resnick
- · Replies 2 ·
High School Creating Universe from "Nothing": Astrophysicists Debate
- Adamchiv
- · Replies 4 ·
Undergrad Chemical Life Possible in Brown Drafw Atmospheres?
- BillTre
- · Replies 1 ·
High School Galaxy Clusters, Masses and Radius
- Jules Winnfield
- · Replies 1 ·
High School Why do we still see cosmic background radiation
- SanderStols
- · Replies 8 ·
Undergrad Does time dilation prevent event horizon formation?
- Petr Matas
- · Replies 22 ·
High School How does the Hoyle state of carbon form in stellar fusion?
- lavinia
- · Replies 12 ·
Undergrad Can a gravitational wave (GW) propagate in a flat universe?
- grauitate
- · Replies 9 ·
Graduate Flatness Problem Differential Equation
- gchmh
- · Replies 1 ·
High School Can Fuzzball Theory Replace Black Hole Singularity?
- wolram
- · Replies 1 ·
Undergrad Converting galactical coordinates to horizontal/geographical coordinates
- Tegalad
- · Replies 5 ·
High School Progress direction of the Aldebaran occultation by the moon
- EnigmaticField
- · Replies 2 ·
Graduate How can future space travel overcome cosmic radiation exposure?
- wolram
- · Replies 31 ·
Undergrad How to extract dark matter mass from a hydrostatic study
- Jules Winnfield
- · Replies 1 ·
Undergrad Why does Andromeda appear farther away if it's moving toward us?
- Adamchiv
- · Replies 12 ·
High School Unanswered questions in cosmology according to Padmanabhan
- wolram
- · Replies 8 ·
High School Cold or warm dark matter or a mixture
- wolram
- · Replies 1 ·
Undergrad Sight and light travel are not the same.
- Tim Layton
- · Replies 3 ·
High School Could a material withstand a black hole's tidal forces to pass through intact?
- AlkamlBan
- · Replies 12 ·
High School Is Electromagnetic Radiation a Key Factor in Intergalactic Space Expansion?
- stoomart
- · Replies 30 ·
High School How do we study space-time singularities?
- Pbody101
- · Replies 11 ·
Undergrad Could Light Cones Actually Curve Inward Towards the Big Bang?
- Edgar L Owen
- · Replies 5 ·
High School Mars' Global Sandstorm: Causes and Effects
- Singlau
- · Replies 4 ·
Undergrad Could Anisotropic Expansion Explain the Dark Matter Effect?
- Edgar L Owen
- · Replies 6 ·
Where Can I See the Milky Way Near Washington DC?
- somebodyelse
- · Replies 7 ·
High School Huge amounts of water ice found on Mars
- mfb
- · Replies 3 ·
Undergrad Euclidean differential number counts of supernovae
- resurgance2001
- · Replies 6 ·
High School Early state of Universe and the "size" of Universe
- Mohd Abdullah
- · Replies 17 ·
Undergrad Can fermions forced together cause black hole formation like in neutron stars?
- kent davidge
- · Replies 14 ·
High School Can we build a four dimensional compass?
- SleepDeprived
- · Replies 4 ·
Undergrad How do cosmologists view loop quantum cosmology?
- kodama
- · Replies 4 ·
High School How to measure the amount of gravitational lensing?
- exmarine
- · Replies 9 ·
Undergrad System simplification through state space
- Guillem
- · Replies 2 ·
High School What structures could explain the Great Attractor?
- rrw4rusty
- · Replies 9 ·
Undergrad Why is the Primordial Power Spectrum Defined as P(k) = (k^3)/(2π^2)|w_k|^2?
- shinobi20
- · Replies 3 ·
High School Is time dilation accounted for in calculating expantion
- JTP3167
- · Replies 11 ·
Undergrad Objective classification of spiral galaxies
- henrco
- · Replies 1 ·
High School Is potential energy infinite if expansion creates unlimited energy?
- Noduagga
- · Replies 17 ·
High School Why gas clouds collapse if the forces are conservative?
- fbs7
- · Replies 15 ·
Undergrad Are Red Dwarfs Home to Earth-Sized Water Worlds?
- |Glitch|
- · Replies 23 ·
Stargazing North American nebula from this past summer
- spark802
- · Replies 3 ·
High School Infinite potential energy for object falling from infinite distance?
- Noduagga
- · Replies 5 ·
Undergrad Fortran program for solar RA/declination and lunar phase
- Jadaav
- · Replies 2 ·
High School Supervoid/Cold Spot evidence of Hawking radiation?
- pittsburghjoe
- · Replies 9 ·
Undergrad What outward force stops a nebula from collapsing under gravity?
- Pauly doyle
- · Replies 2 ·
Stargazing Supermoon Monday: Closest Approach in 70 Years
- hagar
- · Replies 30 ·
Undergrad Could spacetime curvature create closed timelike curves?
- petrushkagoogol
- · Replies 4 ·
Stargazing Should you clean a Newtonian telescope mirror despite the risk?
- sophiecentaur
- · Replies 19 ·
High School Primordial black holes as dark matter candidates
- wolram
- · Replies 2 ·