Astronomy and Astrophysics Forum

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Join in expert discussion on the topics of Astronomy and astrophysics. This may include discussion on celestial objects, space, and the physical universe as a whole. Mainstream science only.
Stargazing I want to make an astronomical telescope
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High School May 10-12 1999 The Day the Solar Wind Disappeared
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Undergrad How Do We Determine the Direction of an Interstellar Signal?
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Undergrad At what point, if any, would a spaceshp burn up in space?
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How can I track Earth's distance to the sun on a specific date?
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High School What can be done about space junk
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Undergrad Surviving the Sun's Disappearance: The Life Expectancy of Earth's Inhabitants
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Undergrad What Are Simple Unsolved Problems in Astrophysics for Beginners?
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Graduate How far away could we detect ourselves?
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Graduate Star Distribution - Types, Galaxies & Time
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High School How Far Are Stars? Calculating Distance to Earth
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Undergrad Is a Cosmic Dust Storm Heading Our Way?
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Graduate Literature on Black Hole Pair Production (?)
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Undergrad How is heat transfered in space?
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Undergrad Ciddor equation. this may be wrong forum, but i dont know where this goes.
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High School Help me Super New bee many questions on energy-space relation and waves.
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Graduate Schwarzschild’s equations & Newtonian Potential
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Undergrad Calculating Speed of Halley's Comet at Aphelion/Perihelion
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Undergrad What Is the Current Estimated Size of the Universe?
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High School What I see in sky - Milky Way, other stars
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High School Dropped popcorn kernel from space will it pop?
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Graduate Where Does the Lost Energy Go in Cosmological Redshift?
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Graduate Possibility of affordable interstellar space flight
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High School Real time effects of light, light speed, and the sun?
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Graduate Estimating the effective grammage of the galaxy
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Stargazing Hubble Space Telescope: Learn What It Is & How It Works
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Graduate Another Crackpot Theory: Neutrinos
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Stargazing Surefire Tips for Photographing Comet Lulin?
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Graduate Do Strange Stars and Strange Black Holes Really Exist?
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Graduate Time Scale Problem: Solving Diffusion Time of Particles in 2D Space
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Graduate Where does the sun rise, w/ axial tilt?
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High School What is BIAS? Learn About CCDs With Randa
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High School Astronomy for AS extended project + tips
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High School IB extended essay in Astrophysics
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Graduate Impossible to graph position vs time?
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High School Can a Gelatinous Ooze Exist in the Vacuum of Space?
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Undergrad Orbital speed of stars within galaxies?
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Graduate What was the Time of Baryon Asymmetry After the Big Bang?
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Undergrad Can a Close-up Apparatus Capture Distant Objects Like a Telescope?
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Graduate Specific Intensity, Flux, Flux Density, Radiative Transfer
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Amazing Mars animation with some facts
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Graduate Can Time Differ in Nested Cylinders Traveling at Near-Light Speed?
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Stargazing Why Doesn't the Secondary Mirror in a Cassegrain Telescope Cause a Blind Spot?
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Undergrad How many stars in the Solar neighbourhood
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Graduate Fermi-Dirac Statistics: What Is It?
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Undergrad Calculating Mass and Density of Planets in Our Solar System
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Undergrad Moon's Inclination To Earth's Equator
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High School How to measure the rotation period of the moon?
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Graduate Changing the rotation of a natural satellite
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Undergrad Help with Escape Velocity Problem
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Northern Lights: See a Light Pillar
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Graduate Magnetic Reconnection vs Double Layers
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Graduate What Are the Leading Theories Behind the Moon's Origin and Inclination?
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Graduate Jets Big and Small: Understanding the Universe through High-Energy Emissions
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Undergrad Can We Measure the Diameter of Stars Using Angular Resolution and Other Methods?
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Undergrad Gravitational pull of a black hole
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Undergrad Rotating transparent object with stars - what was it?
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Graduate What is the Difference Between 1D Spectra and 2D Spectra?
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High School What Makes a Good Starter Telescope for a College Astronomy Student?
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Undergrad What Is the Stone’s Speed at 96,000 km From Earth?
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Undergrad Dark Matter: Could it be Plasma?
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Graduate How Far Must a Planet Be to Become Tidally Locked with Different Star Types?
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Undergrad Lunar Geothermal Energy: Is it Usable?
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  • Poll Poll
VOTE PF PHOTO CONTEST - I'm in a wide open space
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Graduate Could Baryonic Superfluids Explain Dark Matter's Mysteries?
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Graduate Recent research relevant to quasar evolution
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Is love like curved spacetime in this poem?
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Undergrad Why isn't the sun's rate-of-change in elevation constant?
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Undergrad Physical forces of a space collision
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Graduate Source of synchotron radiation causing galactic background noise
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Graduate Read article on Pulsars, not clear how a sphere sources pole-only emission?
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Undergrad Sun's Layer Dynamics: Charting Individual Motions
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Graduate Deriving radial velocity as observed from infinity
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Graduate Correcting for sun diameter and refraction in sunrise/sunset equations
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Graduate What Happens Inside a Black Hole If Dark Matter Falls In?
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Undergrad Where does the galactic distance equation come from?
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Graduate Methanol Maser Emission: Strength and Effects on Earth
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Undergrad How large would a moon impact event have to be to affect the Earth?
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Graduate Energy required to fracture a planetary mass
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Graduate Is the CDM particle still elusive?
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Astrophysicist Neil DeGrasse Tyson. Death by Black Hole
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Graduate Does Density Affect Gravity in the Formation of Neutron Stars?
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PF PHOTO CONTEST - I'm in a wide open space (jan3-10)
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Undergrad Milky Way spins faster, has more mass than thought
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Graduate How Did Planets and Moons Form from Cosmic Debris?
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Graduate Origin of suspected black hole in Omega Centauri
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Graduate Are Quasars and Galaxies Redshifts Truly Quantized?
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High School Meade NGC-70TC Refractor Telescope: Left-to-Right Inversion Explained
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Graduate Young galaxy's magnetism surprises astronomers
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Undergrad What is the Electric Field Strength of the Sun?
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High School Parachute in Space: Can It Deploy?
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Graduate Neutronium Armor: Could it Actually Protect?
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Graduate Quasars: A Different Perspective?
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Graduate Can the physics of consciousness transcend space-time?
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What Are Some Stunning Astronomy Pictures?
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High School How do satellites stay in orbit?
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Graduate Is Dark Energy Just a Misunderstood Form of Gravity?
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Graduate Dark matter or just unobservable?
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High School Is the World Really Ending in 2012 as Some Predictors Claim?
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Stargazing Why isn't my telescope magnifying properly?
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