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 What factors make landing on Mars easier than on the Earth? Harder?
- nukeman
- · Replies 7 ·
Graduate Solving N-Body Simulation Problems with Gravitational Equations
- Lijnk
- · Replies 8 ·
Undergrad Galaxies - spiral arms split, why?
- precisionart
- · Replies 6 ·
Undergrad Can you detect black holes through their radiation?
- RebelRiver
- · Replies 6 ·
Undergrad Stars: Creation, destruction and impact on the universe
- moonkey
- · Replies 1 ·
Graduate Where does space come from in an expanding universe?
- 36grit
- · Replies 12 ·
How can we define the universe as having a shape ?
- AshsZ
- · Replies 7 ·
Undergrad Solving Sun-Earth-Moon Orbit Problem with Solar System Simulator
- Smoove
- · Replies 28 ·
Graduate Photon Red Shift Energy losses in expanding universe theories
- alexjbuck
- · Replies 11 ·
High School Questions regarding Earth life came from Mars - ? - Thanks
- nukeman
- · Replies 5 ·
High School Is 1 AU measured from Earth's center or surface?
- wg1337
- · Replies 17 ·
Graduate Dark disc constraints from missing Milky Way dark matter
- Grep
- · Replies 7 ·
Undergrad Were red dwarfs once as luminous as the Sun?
- MathematicalPhysicist
- · Replies 11 ·
Graduate No evidence for circles in the CMB; contrary to claims by Penrose and Gurzadyan
- nicksauce
- · Replies 4 ·
Graduate Is Space More Fundamental Than Time in Our Universe?
- Dremmer
- · Replies 1 ·
Graduate Penrose claims WMAP evidence of pre-Big Bang activity
- Grep
- · Replies 43 ·
Undergrad Is Time the Movement of Matter Through Space?
- erausch
- · Replies 16 ·
Graduate What Determines the Order of Stars Hitting a Black Hole's Event Horizon?
- thedeester1
- · Replies 2 ·
Graduate Does observing older light from distant stars mean universe expansion is slowing?
- thedeester1
- · Replies 4 ·
High School Are Supermassive Black Holes Really at the Center of Galaxies?
- University
- · Replies 2 ·
Graduate Communication signals and the speed of light
- auxengin
- · Replies 3 ·
Undergrad Could dark energy be electromagnetic radiation from the big bang?
- ravisastry
- · Replies 1 ·
Graduate What is the shape of the universe?
- Rainbow
- · Replies 29 ·
High School Do we know what type of organism first started life on Earth?
- nukeman
- · Replies 1 ·
Graduate When can true singularity take place? Was the big bang the only chance
- baywax
- · Replies 65 ·
Undergrad How to Calculate Gravitational Acceleration on a Planet with Core and Shell?
- jrw
- · Replies 7 ·
Undergrad Are There Recent Findings on Earth-Sized Exoplanets and Instrument Limitations?
- madman143
- · Replies 2 ·
Graduate Can Earth Orbit a Black Hole Indefinitely?
- CentricStorm
- · Replies 2 ·
Undergrad What Would Happen If We Turned Off the Sun's Gravity?
- Timmulus
- · Replies 18 ·
Graduate Published data sets for distance modulus versus redshift
- redtree
- · Replies 5 ·
Graduate Can dark matter annihilation produce the observed gamma ray emissions?
- physalpha
- · Replies 1 ·
Graduate Does matter bend spacetime enough to make the universe wrap around on itself?
- thehangedman
- · Replies 6 ·
Graduate The Role of EM Radiation in Cosmology Today
- giann_tee
- · Replies 7 ·
Graduate Does Gravity Travel at the Speed of Light?
- AdkinsJr
- · Replies 4 ·
Graduate Could dark matter be explained as a quantum gravity effect?
- ensabah6
- · Replies 2 ·
Graduate How can I access the Hipparchus HR Diagram data for my project?
- Mu naught
- · Replies 1 ·
Graduate Three times as many stars? (new estimate by van Dokkum and Conroy)
- marcus
- · Replies 1 ·
Graduate Building Blocks of Life: Paradox of Drake Equation Fl Term
- madman143
- · Replies 5 ·
Undergrad Structure for mid-semester report on Hubble and Chandra data analysis
- The_shadow
- · Replies 1 ·
Undergrad Universe contains many more red dwarfs than previously thought
- Grep
- · Replies 1 ·
Graduate New figure for speed of solar system relative to the ancient light
- marcus
- · Replies 1 ·
High School Can Cosmic Rays Penetrate Stones, Mountains, and the Human Body? Answers here!
- mackreg
- · Replies 5 ·
Undergrad Astronomy or intro to psychology for an easy elective
- sportsstar469
- · Replies 22 ·
Graduate Could Fermi bubbles account for dark matter?
- komodekork
- · Replies 21 ·
Undergrad How Far Away Are the Farthest Quasars in the Universe?
- grant9076
- · Replies 11 ·
Graduate How did matter go so far so fast?
- tesseract7d
- · Replies 6 ·
Graduate The fate of the Universe - big rip, then big crunch?
- DavidGahan
- · Replies 5 ·
Graduate Is Fusion possible at the accretion disk of a Black Hole?
- Qentanglement
- · Replies 5 ·
Undergrad Just need someone to clear something up for me
- iminhell
- · Replies 2 ·
Undergrad Where Can I Find Resources on Orbital Mechanics for Game Development?
- Speedo
- · Replies 1 ·
Undergrad Converting Jupiter moon orbital period and semi-major axis to years and AU
- nukeman
- · Replies 3 ·
High School How Do Meteor Showers Occur?
- harp AP 2010
- · Replies 1 ·
Undergrad What Formulas are Used to Put an Object into Orbit?
- edo1493
- · Replies 3 ·
Graduate Quantum/Relativitiy and the Speed of Light Paradox
- Grotug
- · Replies 11 ·
Graduate Miniscule changes in the physical constants?
- Edward Solomo
- · Replies 5 ·
High School Why Does the Moon Glow? Causes of Illumination
- dirtypunk
- · Replies 5 ·
Undergrad Are Black Holes Infinite and Do They Emit Jets?
- stever19
- · Replies 14 ·
Graduate Using Maxima for BTZ black hole metric calculations
- Canopus
- · Replies 5 ·
Undergrad If the universe came from a single atom, then
- nap
- · Replies 2 ·
Graduate Could intelligent life cheat God?
- GladScientist
- · Replies 13 ·
High School Galileo's discoveries and what determines a star's spectral class
- University
- · Replies 2 ·
Graduate Why does the universe have to have a beginning?
- Vexa
- · Replies 22 ·
Graduate Calculation of CMB anisotropies size
- fab13
- · Replies 2 ·
Stargazing Binoculars or Telescope: Which is the Better Choice for Amateur Astronomy?
- blitzfu
- · Replies 4 ·
Graduate Is the universe fundamentally mathematical?
- mateuszica
- · Replies 17 ·
High School Is there a 3D map of the naked-eye visible nightsky objects?
- alpskomleko
- · Replies 5 ·
Graduate What Is the Typical Magnetic Field in High Mass Stars?
- amarante
- · Replies 2 ·
Undergrad How dense could Earth's atmosphere potentially be?
- Uncle Al
- · Replies 5 ·
Undergrad Cometologist Brian Marsden Obit
- epenguin
- · Replies 0 ·
Graduate Is the Universe Infinite? Theories and Considerations
- NowIsForever
- · Replies 46 ·
Graduate Spectroscopic Analysis of the IR-Visible Galactic Core
- psholtz
- · Replies 5 ·
Graduate How Does Matter Influence the Universe's Expansion and Dark Energy?
- stever19
- · Replies 2 ·
Graduate Why doesn't the sun move much despite changing gravitational forces?
- vin300
- · Replies 6 ·
High School General info on our solor system
- MillerGenuine
- · Replies 12 ·
High School Will the supernova IRAS 20068+4051 expand or keep its spiral shape?
- Philosophaie
- · Replies 4 ·
Undergrad Is the Universe Becoming More Orderly or Disorderly?
- leonstavros
- · Replies 20 ·
Undergrad What Forces Shape Bar-Centered Galaxies?
- physalpha
- · Replies 2 ·
Graduate Is the universe finite or infinite?
- mattex
- · Replies 179 ·
Graduate Can Black Holes Dance Around Each Other Without Merging?
- 6nqpnw
- · Replies 17 ·
Graduate Best method to measure gravitational redshift with a small telescope?
- bigray69
- · Replies 6 ·
Graduate Extinction events and an astrolabe
- Panwasbipolar
- · Replies 2 ·
High School Our solar system's proximity to other ones
- jaketodd
- · Replies 9 ·
Graduate What is the 'faint regime' in cosmological explosions?
- spossatamente
- · Replies 1 ·
Graduate How is the Galactic Magnetic Field Measured and Modeled?
- amarante
- · Replies 2 ·
Graduate String stars instead of black holes?
- Maniax101
- · Replies 4 ·
Graduate Does the entire universe have a survival instinct?
- baywax
- · Replies 39 ·
Undergrad Kepler's Second Law: Equal Area in Equal Time
- harp AP 2010
- · Replies 2 ·
Graduate Why are quasars almost extinct today?
- Ramael
- · Replies 2 ·
Graduate Could White Holes Exist Beyond Black Holes in Higher Dimensions?
- timbuckiii
- · Replies 9 ·
Graduate What happens when a neutron star collides with a white dwarf?
- alvarogz
- · Replies 4 ·
Graduate Is the birth of the Universe a random event?
- Plebeian
- · Replies 23 ·
Graduate What Is the Universe Expanding Into and How Fast Is It Growing?
- Negativ3
- · Replies 24 ·
Undergrad Weather Ballon with Camera/GPS payload. 1x600g or 2x600g balloon for lift?
- Rbai63
- · Replies 3 ·
Graduate Is Our Perception of the Universe Just a Black Box?
- Physics-Learner
- · Replies 107 ·
Graduate Can we make a standard Universe clock?
- physalpha
- · Replies 6 ·
High School What was the level of astronomy like in say 1888?
- stany
- · Replies 11 ·
Graduate Binary w/ black hole - semi-major axis?
- accountkiller
- · Replies 2 ·
Undergrad Why does cosmic ray intensity peak at 20 km altitude?
- logearav
- · Replies 5 ·
Rare, not so well known facts about Andromeda. ?
- nukeman
- · Replies 16 ·
Graduate Could We Detect and Avoid a Black Hole Approaching Our Solar System?
- Chimps
- · Replies 14 ·