Astronomy, Astrophysics, Cosmology Forum

High School Measuring in Space: How Sensors Work in the Cosmos

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Undergrad Why are Ceres and dwarf planets excluded from the IAU definition?

Undergrad Velocity of a ball falling through Earth's center

High School Only earth orbits in a circular motion?

High School What Truly Defines a Vacuum?

Graduate How metallicity evolution in Type Ia supernovae affects cosmological parameters

Graduate Why is our universe the way it is?

Graduate Why Does Light Bend Around Massive Objects?

Graduate Planck black-box radiation and the universe

High School What is the red circle near the moon phenomenon?

Graduate Deriving Friedmann Equation from RW Metric - Blumfeld

Graduate Solution to the lithium discrepancy

Graduate What are the Origins and Characteristics of Cosmic Neutrinos?

Graduate Expanding universe and Conservation of energy.

Undergrad Doppler Effect and the Expanding Universe

Graduate Is the law of non-contradiction universal across all possible universes?

Graduate Drake Equation: Parameters, Missed Factors & Technical Limits

Graduate How are the Casimir Effect, Vacuum Energy, Inflation, and Dark Energy Connected?

Undergrad Just a question of planetary magnetism

Graduate Does the bending of light by objects affect our view of the universe as a whole?

High School Has a galaxy ever split into two separate galaxies?

Graduate Is the Multiverse Theory More Plausible Than Inflationary or Ekpyrotic Models?

Graduate Why can't we see light from black holes if gravity and light travel at the same speed?

Graduate Blackholes theory maybe incorrect?

High School What Are Some Questions About the Universe That a Newbie May Have?

Stargazing Buying a telescope any suggestions?

Graduate Universe might be older and bigger

Graduate Ultimate configuration of a flat universe

Graduate Where Does '13.7 Billion' Come From?

Graduate Is Planck's Constant Constant, or Does it Vary Through Spacetime?

Undergrad Phases of the Moon: Angular Separation Question

Graduate Collection of known scientists that are beyond the standard model

Graduate Does the 2nd Law of Thermodynamics Apply to Entropy in a Big Crunch?

Undergrad Final Year Project Ideas: Astronomy with a Celestron Telescope

Graduate What are the latest exciting results from WMAP's three-year data release?

Graduate Could galactic redshift be from orbital motion rather than expansion?

Graduate Binary Planemos Challenge Traditional Views on Planet and Star Formation

Graduate Have dark energy and dark matter percentages changed since the big bang?

Undergrad How Does Weight and Thrust Affect Rocket Acceleration and Velocity?

Undergrad C11-SGT vs CPC 1100 GPS: which Celestron 11" mount is better?

Graduate Definition of Volume Limited Sample for Sky Surveys

Graduate Calculating Solar Core Radius Using Emden's Equation

High School Are Stars Really Formed by Black Holes?

Graduate Do cosmologists understand what drives the inflaton and gravitational fields?

Undergrad Position of Earth in the Universe

Graduate How do we detect and study dark matter in our universe?

Graduate Different laws after a big crunch/big bang

Graduate Can a body at a Lagrange point affect Earth's tides and create new Lagrange points?

Graduate Is the Accelerated Expansion of the Universe Misunderstood?

Graduate What is the purpose of the entire infinite universe?

Undergrad Why do black holes emit X-rays if light cannot escape?

Graduate Sachs-Wolfe effect and dark energy

High School Imagine to be Pluto's surface, climate and atmosphere?

Undergrad How quasars are related to black holes in galaxies?

Undergrad Big Bang Theory: Can Universe Expand Faster than Light?

Graduate Entropy, information and Omphalos cosmology

Graduate Questions about supermassive black holes and jets

Graduate What Basis Supports the Theory of an Expanding Universe?

Undergrad Why do Spectroscopic Binaries Have Short Periods?

Graduate What is the current consensus on 7Li abundances and key research papers?

Graduate How can an infinite universe begin with a finite singularity?

High School South Delta Aquarid or Perseids?

Graduate Observing a Body at z=6: Calculating Photon Requirements

Graduate Is the curvature of the universe affected by dark energy and if so, how?

Graduate Black holes and the expanding universe

Graduate Planck - stelactic - cosmological black hole symmetry?

Undergrad Sudden ceasing of energy generation

Graduate Question on the expansion of space

Graduate How Deeply Can We See Into the Sun?

Graduate No Redshift from Distant Galaxies: Implications for Universe

Undergrad Fusion of Stars: Time Difference for 0.50 & 1.5 Msolar Stars

Graduate Thiemann's approach to the problem of time in general relativity

Undergrad Gravity on the surface of the Moon

Graduate Objects faster than light because space is expanding

Graduate How many M type stars equal the luminosity of one O type star?

Undergrad If Mars had 25% more mass would its orbit be further or closer to the sun?

Graduate Theories without the use of cosmological principle.

Graduate Is Every Galaxy the Center of the Universe?

High School What is the density of the Sun's surface?

High School How do these triangular toothpick ion engines lift off the ground?

Graduate What is singularity in black holes?

Graduate Is an infinite universe with pocket universes mainstream cosmology?

Undergrad Does Juggling Follow Kepler's 2nd Law?

Graduate Large number coincidence and scaling laws in cosmology

Graduate The cosmological principle in simple models of the universe

Graduate Matter and space-time mutually exclusive?

Graduate Does omega measure only the observable universe's geometry?

Graduate Amount of Matter in the Universe

Undergrad Age of the sun in galactic years

High School What Would Happen if We Tried to Pull the Moon Closer to Earth?