Astronomy, Astrophysics, Cosmology Forum

Graduate How Can I Improve the Accuracy of My Geostationary Orbit Propagator?

High School Could Traveling Against the Earth's Rotation Cause a Sunset-Sunrise Reversal?

Graduate Calculating age of the universe using redshift?

Graduate What are the origins of Moon Mascons?

Graduate Can light from beyond c/H reach us as the Hubble constant becomes asymptotic?

Graduate Sources of noise in geostationary satellite attitude determination simulation

Undergrad Can White Holes Form Naturally or Are They Only Theoretical?

Graduate If the strength of gravity levels off, could black holes be unphysical?

Graduate Why is a distributed household telescope array impractical?

Graduate Did a protoplanet impact explain Uranus' tilt and its moons' retrograde orbits?

Graduate Can we see the Earth in the past

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Graduate How did the cosmos form w/o observers around?

Graduate Looking for online solar astronomy book/course

Undergrad Do stellar RA and declination change over time?

Graduate Perhaps we live in a black hole?

Undergrad Where does the energy in a gravitational slingshot maneuver come from?

Undergrad Could an ExoEarth with 70% Land and 30% Water Host Unique Life Forms?

Graduate Can Antimatter Catalysed Engines Propel Us Across the Galaxy?

Undergrad Book with proofs for equation of time and sunrise/sunset calculations

High School Astronomy and astrophysics, are they the same?

Graduate Is the Universe Both Flat and Accelerating?

Undergrad Reccomend a stellar database for my software program?

Undergrad The densest areas in the universe

Undergrad Why Doesn't Earth Fall Into the Sun?

High School Can We Overcome the Challenges of Space Travel Beyond Our Solar System?

High School Catastrophic event stopped growth of galaxy{ON News}

Graduate Why Were Early Universe Stars More Massive Than Today's Stars?

High School How to explain black holes to 5th graders

Undergrad Why are black holes fundamentally different from dense balls of matter?

Graduate Does expansion exist on the micro level as well as the galactic level?

Graduate Heat Applied to Black Hole: What Happens?

Graduate Can we measure the Sun's velocity through the universe?

Graduate What ideas does the discrepancy of CMB photons affect?

Graduate Virtual particule and event horizon

Undergrad Why are people saying that the radius of the observable universe is 46.5 ly

Graduate Why do pair-instability supernovae leave no black hole remnant?

Graduate How Many Photons Reach the Hubble Telescope from a Distant Star in a Day?

Graduate Paradox of the Universe - Physics or Voodoo Philosophy?

Graduate Does entropy in our universe tell us about a larger superset reality?

Graduate Changeover from deceleration to acceleration

Graduate How can black holes attract massless photons?

Graduate Solar system's motion toward the solar apex and angular velocity

Graduate Effects of moon on prehistoric earth

Graduate Cosmic background radiation - redshift, blueshift, anisotropies

Graduate Gravitational force needed to form a black hole singularity

Graduate What is the role of gravity in the cosmological redshift?

Graduate Could advanced technology artificially accelerate the evolution of our sun?

Graduate Dark energy as an entropic force?

Graduate How can all the matter in the universe start out as one point?

Graduate What are the Quantum Mechanics Situations Allowing Light to Escape Black Holes?

Graduate Does Hartle-Hawking no boundary theory mean time is an illusion?

Graduate Is Gravity Weakening as the Universe Expands?

Undergrad Changing Earth's Orbit: How Has the Speed Around the Sun Evolved?

Graduate Can Quantum Tunneling Enable Faster-Than-Light Communication?

Stargazing Is the Celestron Astromaster 114EQ a good beginner telescope?

Graduate There is no such thing as empty space in an atom. True?

Graduate Copernican Principle and Metric Expansion

Graduate The Big Bang.. just one little question

High School How do we know what the sun is made of?

Graduate The formation of Galaxy Clusters from density fluctuations in the early Universe

Undergrad Universe expansion, then deceleration, then acceleration?

Graduate Absolute color - magnitude diagram

Undergrad Visualizing daily life through broader EM spectrum

Graduate Confusion with conversion for the Hubble Constant

Graduate Blackholes In The Early Universe

Undergrad Need Controversial Topic for an Eng102 Class

Graduate Is the EFS boundary term approach circular reasoning?

Graduate Do galaxy and superluster studies predict the same dark matter distribution?

Graduate What changes the rate of inflation

Graduate Could Expansion Explain Gravity Mathematically?

Graduate Is our universe a membrane with almost no dimension?

Undergrad Calculate the final velocity of an object accelerating towards a mass

Graduate So what happen to a shuttle that enters a black hole?

Undergrad Does recessional velocity from cosmic expansion contribute kinetic energy?

Undergrad Ion-powered dirigible as a space freighter concept

Graduate Bolometric Magnitude and H-R diagram

Undergrad *quantitative* fun with the cosmos (easy)

Undergrad Variation of gravity along latitude

Graduate How do I calculate the phase integral for the Bond albedo in astrophysics?

Graduate Is Relative Motion Evidence of a Static Aether in Orbital Physics?

Graduate Finite Big Bang, Infinite universe?

Undergrad What is the critical rate of expansion in kilometers per hour?

Graduate Big Bang - galaxies not mapping onto a point

Undergrad Will we go the the past if we could go faster than speed of light?

Graduate What could dark matter be made of if not atoms?

Undergrad A small finite universe and some wierd thoughts from it

Graduate Current eff. universe limited to redshift 1.73

Graduate Constants and multiverse possibilities