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 Dark matter can be cold warm or hot
- wolram
- · Replies 2 ·
Undergrad What is known about dark matter distribution in galaxies?
- Buzz Bloom
- · Replies 14 ·
Should humanity prioritize Earth research or space research?
- houlahound
- · Replies 7 ·
High School New star in the skies -- Plausible?
- lifeonmercury
- · Replies 20 ·
High School Problems With a Terraformed Moon -- Maybe?
- Oomuu
- · Replies 32 ·
Graduate Starobinsky Inflation and Supergravity
- Urs Schreiber
- · Replies 10 ·
Undergrad Can black holes explain dark matter?
- SD das
- · Replies 2 ·
Undergrad Gravitic Field of Rotating Disk-Shaped Mass Along Ecliptic
- havonasun
- · Replies 3 ·
Stargazing How Can a Grain of Sand Create a Bright Meteor?
- megacal
- · Replies 80 ·
Undergrad Effort to get us all on the same page (balloon analogy)
- marcus
- · Replies 548 ·
High School Is dark matter self-interacting?
- wolram
- · Replies 20 ·
High School Significance of a planet's "surface gravity"
- lifeonmercury
- · Replies 1 ·
High School Move vehicle in space by rail structure systema
- Juuso
- · Replies 10 ·
High School Time dilation on a spaceship traveling at 99.99% the speed of light
- lifeonmercury
- · Replies 26 ·
High School Is the Earth in its original orbit?
- scincemaniac
- · Replies 11 ·
Undergrad What is the Role of Space in this Apparatus?
- GrantSB
- · Replies 1 ·
Undergrad Do cosmological models exclude Boltzmann brains as physical impossibilities?
- durant35
- · Replies 24 ·
Stargazing Nebulosity is a hard program for the aged?
- sophiecentaur
- · Replies 7 ·
High School B Calculating the age of the universe with the Hubble constant
- anonymous24
- · Replies 8 ·
Undergrad Cosmological electroweak phase transition
- Carlos L. Janer
- · Replies 22 ·
High School How do we observe black holes moving if time stops near them?
- Jacob Gable
- · Replies 7 ·
Undergrad Galaxy Merger and Damped Oscillation?
- FallenApple
- · Replies 2 ·
High School What is your favorite planet of the solar system?
- bellocchiocarmel
- · Replies 16 ·
Undergrad What observation shows galaxies are in steady state circular motion?
- Csmith
- · Replies 17 ·
High School If Earth moves at 500,000 mph then why don't satellites stay behind?
- IsItSo
- · Replies 18 ·
Undergrad Has anything in the universe ever reached 0 Kelvin?
- Remon
- · Replies 16 ·
Undergrad Is the fabric of space a "medium" for light?
- GrantSB
- · Replies 3 ·
Undergrad Is angular momentum conserved in a Supernova?
- FallenApple
- · Replies 2 ·
Undergrad How to solve for the volume of the universe / redshift
- rano jojo
- · Replies 11 ·
Undergrad Can 21 cm Emission Be Detected in a Laboratory?
- amarante
- · Replies 2 ·
High School How does gravity emerge from information in quantum systems?
- wolram
- · Replies 4 ·
High School Is all the energy from the big bang still conserved?
- ChrisisC
- · Replies 15 ·
High School What is the Relation Between Jeans Mass and Fundamental Mode in Acoustic Waves?
- Discman
- · Replies 12 ·
Graduate Why isn't the pull of gravity neutral on large scales?
- rede96
- · Replies 34 ·
High School Questions about the origin and evolution of dark energy.
- K. Doc Holiday
- · Replies 8 ·
High School How can a physical entity be infinite?
- Chris Miller
- · Replies 28 ·
High School What Do Scientists Think a Black Hole Is?
- wolram
- · Replies 23 ·
High School Is the Universe infinite or not?
- Robertphysics
- · Replies 38 ·
High School Does dark matter make black holes bigger?
- adolphysics
- · Replies 11 ·
Undergrad Can we measure time without reference to entropy?
- windy miller
- · Replies 22 ·
High School Are OH molecules in masers ionized?
- TheCanadian
- · Replies 2 ·
High School Is the Universe Infinitely Large Since the Big Bang?
- kjamha
- · Replies 1 ·
Undergrad Is Stellarium More Accurate Than VSOP87?
- Tegalad
- · Replies 2 ·
Undergrad What Does the h Subscript 70 to the Power of 3 Mean in Supernova Units?
- resurgance2001
- · Replies 4 ·
Undergrad How is the first multipole calculated from the Plank Study?
- Jules Winnfield
- · Replies 1 ·
High School How are asteroids detected if they absorb sunlight?
- Albertgauss
- · Replies 9 ·
Undergrad Why do things fall into a black hole?
- Singlau
- · Replies 2 ·
Undergrad Why do planets follow the same curvature at both foci?
- StandardsGuy
- · Replies 12 ·
High School Determining the transition frequency
- TheCanadian
- · Replies 2 ·
Undergrad Should dark matter and dark energy have completely different models from ordinary matter?
- Sheldon Cooper
- · Replies 2 ·
High School What would happen if 6 black holes surrounded a planet?
- phillovix
- · Replies 15 ·
High School Could a black hole be hiding inside a neutron star?
- James Minwell
- · Replies 3 ·
Undergrad Would quantum laws work in other hypothetical universes?
- FallenApple
- · Replies 3 ·
High School Theory that challenges Einstein's physics could soon be put to rest
- wolram
- · Replies 9 ·
Graduate Is the Cosmic Microwave Background Linked to Dark Energy?
- RankAstronamateur
- · Replies 6 ·
Undergrad How do mass and temperature change in black holes due to Hawking Radiation?
- James Way
- · Replies 3 ·
Undergrad Could Bullet Cluster dark matter be primordial black holes instead of particles?
- kodama
- · Replies 9 ·
High School Black hole event horizons: shape, singularities, and jets
- K. Doc Holiday
- · Replies 2 ·
Graduate Understanding MASERs and their properties
- TheCanadian
- · Replies 1 ·
High School Can Orbiting Bodies Slow Down Over Time?
- micropulsar
- · Replies 11 ·
High School Why doesn't a black hole appear bright if infalling matter looks frozen at its surface?
- charles watson
- · Replies 27 ·
Undergrad Does permeability of free space change with applied magnetic fields?
- MarSuper
- · Replies 12 ·
High School Can Hydrogen-Based Plastic Provide Better Radiation Protection than Lead?
- entrance
- · Replies 4 ·
High School Temperature in the space between planets of our solar system?
- Albertgauss
- · Replies 11 ·
High School Why do spiral galaxy arms bifurcate and what direction is the matter moving?
- Sanborn Chase
- · Replies 25 ·
High School Discussing Juno/JunoCam Mission and Jupiter Data
- 1oldman2
- · Replies 112 ·
High School Can civilizations 4 light years apart detect each other without radio?
- lifeonmercury
- · Replies 21 ·
High School Dark matter interacts with visible matter via gravity
- Sanborn Chase
- · Replies 5 ·
High School Is a Black Hole Really Just a Spherical Structure?
- Simon Peach
- · Replies 52 ·
Undergrad Where does a polytropic EoS come from?
- Vrbic
- · Replies 2 ·
Graduate Did the universe Absolutely begin?
- JhonnyDx
- · Replies 47 ·
Undergrad What are black holes made of?
- Will K
- · Replies 1 ·
Undergrad Black Hole Time Dilation: What Would an Astronaut See?
- Will K
- · Replies 4 ·
High School Infinite amount of matter in the universe?
- lifeonmercury
- · Replies 53 ·
High School What is the speed of cosmic rays in km/s?
- Dr Wu
- · Replies 8 ·
High School Is There a Limit to the Expansion of the Universe?
- Subrata Paul
- · Replies 2 ·
Undergrad Does stellar glare affect starlight passing through an exoplanet's atmosphere?
- akashpandey
- · Replies 6 ·
High School Living on Titan: A New World for Humans?
- lifeonmercury
- · Replies 1 ·
High School Action and reaction of a rocket in space.
- Clara Chung
- · Replies 3 ·
High School Is the effect of gravity limited by distance?
- lifeonmercury
- · Replies 29 ·
Undergrad Feasibility of terraforming Mars for a technical writing project
- juanitosguitar
- · Replies 14 ·
High School How does black hole merger cause loss of mass?
- danihel
- · Replies 8 ·
Stargazing How Can Both Jets from a Black Hole Appear to Move Faster Than Light?
- K. Doc Holiday
- · Replies 3 ·
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 ·