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 How Kepler derived that T^2 is proportional to r^3
- parsa418
- · Replies 2 ·
Graduate How much of galaxy redshift is due to gravity?
- very_curious
- · Replies 22 ·
High School What an Expanding Universe Looks Like
- FeDeX_LaTeX
- · Replies 1 ·
Graduate Can Galaxies Have Two Nuclei Without Merging?
- chris2112
- · Replies 2 ·
Graduate Better Hubble Constant through Parallax?
- Subluminal
- · Replies 1 ·
High School What are the odds we'll find alien life?
- Rocketjj
- · Replies 78 ·
Graduate Is Noether's theorem applicable to the expanding universe?
- quin dexter
- · Replies 44 ·
Graduate Can anyone explain how white holes work in rotating black holes?
- Nalar
- · Replies 19 ·
Graduate Why don't black holes consume dark matter if dark matter responds to gravity?
- stunner5000pt
- · Replies 5 ·
Graduate Does dark matter fall into a black hole, and create radiation
- DarkMatterHol
- · Replies 13 ·
Graduate Can Some Galaxies Travel Faster Than Light?
- narrator
- · Replies 12 ·
Graduate Could Black Holes Have Created Our Universe?
- doc.madani
- · Replies 31 ·
Graduate Can Spacetime Equations Be Interfered With to Propel Mass?
- narrator
- · Replies 8 ·
Undergrad How Much Longer Does an Atomic Clock Run on the Moon Compared to Earth?
- rowbot555
- · Replies 3 ·
Graduate Dark matter really due to stars having some charge?
- PAllen
- · Replies 27 ·
Graduate Why is high redshift data needed to measure cosmic acceleration?
- humanist rho
- · Replies 18 ·
High School Explain Kepler's 3rd Law of Planetary Motion
- AstrophysicsX
- · Replies 14 ·
Graduate Orbit of planet have to be a conic section
- sorce
- · Replies 2 ·
Undergrad Could a bullet shot from a spaceship orbiting Earth escape the planet?
- DrZoidberg
- · Replies 9 ·
Graduate Is it possible that the sum total of everything is nothing?
- erickulcyk
- · Replies 7 ·
Undergrad Why Do Physicists Consider Black Holes Something?
- nukeman
- · Replies 7 ·
Are the Wonders of the Universe waiting to be discovered?
- ehilge
- · Replies 1 ·
Graduate A Black Hole's Event Horizon: No Particles Have Crossed...Yet
- alphachapmtl
- · Replies 16 ·
High School Why planets move ant-clockwise direction
- rick112
- · Replies 3 ·
Graduate Can a 1kg Black Hole Be Manipulated and Moved?
- Jarfi
- · Replies 5 ·
High School Is the Universe a Giant Russian Doll?
- stany
- · Replies 8 ·
Graduate Was There Time Before the Big Bang?
- dm4b
- · Replies 8 ·
Graduate What is the Energy of the Big Bang?
- cansay27
- · Replies 38 ·
Graduate Do the fundamental laws of physics apply in parallel universes?
- shyam1993
- · Replies 3 ·
Undergrad Does Time have a mathematical equation or Law?
- nukeman
- · Replies 9 ·
Undergrad Space Junk Removal: Is Laser Technology the Answer?
- satya98
- · Replies 3 ·
Graduate Could universe expansion be caused by cooling rather than cooling by expansion?
- mrspeedybob
- · Replies 48 ·
Graduate Matter-antimatter imbalance - how do we know?
- technobot
- · Replies 18 ·
High School Are Stars Limited to Galaxies or Can They Exist in Intergalactic Space?
- trentt
- · Replies 8 ·
Graduate Would an object appear frozen while crossing into the threshold
- Cosmo Novice
- · Replies 10 ·
High School What can I do if I study astrophysics?
- Rock4231
- · Replies 4 ·
Stargazing What's a good, affordable telescope for someone who's never owned one
- 1MileCrash
- · Replies 8 ·
Undergrad How Does the Angle of Impact Affect the Depth of Meteorite Craters?
- McHeathen
- · Replies 5 ·
Undergrad Cosmological Inflationary Models
- cansay27
- · Replies 2 ·
Graduate How is it possible the universe is infinite?
- G3n3sis1
- · Replies 13 ·
Graduate Graduate project topic in astronomy and cosmology
- humanist rho
- · Replies 6 ·
Graduate Objects as L3 and L4 at once - possible?
- Shraa
- · Replies 7 ·
Is life on other planets limited by the elements present?
- TheJoninator
- · Replies 11 ·
What Are the Dangers of Space Travel?
- TheoryMan
- · Replies 9 ·
Its crazy to think its all actually out there
- stany
- · Replies 25 ·
Is there an astronomical explanation for a day without darkness?
- moonman239
- · Replies 30 ·
High School Physics Projects for Teenagers - Charles's Quest
- Cbray
- · Replies 5 ·
Graduate What Is the Physical Reality of Space?
- justwondering
- · Replies 12 ·
Graduate What is the Definition of the Wave Zone in Potential Calculations?
- Radiohannah
- · Replies 2 ·
High School Easter dating spreadsheet for Excel/OpenOffice
- moonman239
- · Replies 1 ·
Undergrad The Doppler Effect: Near and Far Galaxies
- jerome951000
- · Replies 3 ·
Graduate Has Bekenstein's MOND Paper on Dark Matter Alternatives Been Fully Understood?
- inflector
- · Replies 22 ·
Graduate Required mass for hydrogen burning in stars
- ted1986
- · Replies 4 ·
Could the universe be rotating about all axes simultaneously?
- RichyRich
- · Replies 82 ·
Graduate Calabi-Yau Writing Fiction Question
- Misericorde
- · Replies 3 ·
Best astronomy and cosmology audiobooks for beginners
- capt stevie
- · Replies 5 ·
Stargazing How does telescope resolution limit what we can see at great distances?
- Ryan_m_b
- · Replies 8 ·
Graduate Universe expansion and inflation timeline for science fiction
- Cajun
- · Replies 25 ·
Graduate What Happens If an Object Exceeds the Speed of Light?
- Cajun
- · Replies 33 ·
High School Distance to the Moon: NASA's Measurements and Findings
- Bjarne
- · Replies 3 ·
Graduate Does Our Solar System's Orbit Through the Galaxy Cause Magnetic Pole Reversals?
- korben dallas
- · Replies 24 ·
High School What are Supernovae and Hypernovae? Any resources or insights?
- EMLAY
- · Replies 7 ·
Graduate April is the time to see where the solar system is going (at 370 km/second)
- marcus
- · Replies 3 ·
Undergrad Calculating Mass-Kepler's 3rd Law
- winterrose
- · Replies 1 ·
Graduate Cosmology With Sunyaev-zeldovich Effect
- as_if_iqbal
- · Replies 2 ·
Graduate How can a 50 billion light-year universe exist in 14 billion years?
- MCPO John-117
- · Replies 19 ·
Graduate Black Hole Mass Accretion Temperature
- purple_wave
- · Replies 2 ·
Undergrad What would a black hole look like in front of a nebula?
- The Cow King
- · Replies 22 ·
Stargazing Zhumell Z8 Dobsonian for portability and viewing quality
- Who Am I
- · Replies 5 ·
Graduate Luminosity distance in a universe with only spatial curvature
- jc09
- · Replies 13 ·
Graduate Why is the anthropic principle controversial?
- 1dominator1
- · Replies 28 ·
Graduate Astronomy in UV and X-ray Spectrum
- skyboarder2
- · Replies 1 ·
Undergrad Transition A produces light with a wavelength of 400 nm
- Votz
- · Replies 5 ·
Graduate Is our universe finite or infinite?
- Space Drifter
- · Replies 12 ·
Graduate Falsification of eternal inflation
- offroff
- · Replies 132 ·
Graduate How Can I Calculate the Distance of an Object in an Elliptical Orbit Over Time?
- Texas2011
- · Replies 6 ·
Undergrad Using a straw in a space capsule
- starfish99
- · Replies 4 ·
Undergrad What is phase-space density?
- Shaybay92
- · Replies 1 ·
Graduate Creating a homework problem on dark energy with Type Ia supernova data
- cpamieta
- · Replies 1 ·
Graduate Are we accelerating in the universe?
- instanton
- · Replies 3 ·
Undergrad Astrophysics Reading Suggestions for College Students
- astrocat3
- · Replies 2 ·
Graduate Argument that all computable universes are real
- StatusX
- · Replies 23 ·
Graduate How Do High Redshift Galaxies Differ from Low Redshift Galaxies?
- skydivephil
- · Replies 2 ·
Graduate What happens to the universe after 10^(trillion) years?
- Jonnyb42
- · Replies 12 ·
Graduate Understanding Vacuum Energy Density in Relation to Universe Expansion
- TrickyDicky
- · Replies 18 ·
Graduate Dark Matter Halo: Modeling Rotational Effect on Galaxy V(r)
- Creebe
- · Replies 4 ·
Graduate Does Light Mass Increase a Black Hole?
- PerenialQuest
- · Replies 8 ·
Graduate Is physics mathematically deducible?
- thiazole
- · Replies 23 ·
Graduate Antimatter Universe: Same or Different?
- abuguchie
- · Replies 5 ·
Graduate How can the universe be infinite?
- steveclay
- · Replies 23 ·
Undergrad Gravity and the Formation of Stars
- daisey
- · Replies 7 ·
Graduate Why doesn't maximum entropy imply maximum chaos?
- Rooster1981
- · Replies 18 ·
Graduate What are the chances of the Big Bang producing us?
- Seraph316
- · Replies 11 ·
Graduate What is the difference between inflation and expansion?
- andrewkirk
- · Replies 8 ·
Undergrad Teslescopes see the past, but which?
- trini
- · Replies 7 ·
Graduate Black holes and only photons going in
- stanjones
- · Replies 7 ·
Graduate The entropy of the universe? (attempts to define gravitational entropy)
- marcus
- · Replies 22 ·
Graduate Susskind on the cosmological constant.
- Freeman Dyson
- · Replies 7 ·
Graduate How do branching ratios affect neutrino fluxes at Earth?
- ted1986
- · Replies 2 ·
Graduate What is the impact of life on Earth and its environment?
- korben dallas
- · Replies 20 ·