Ptolemaic Geocentric Astronomy: Ptolemy's Geometric Devices Deferent, Epicycle, Eccentric, & Equant
By: 
Paul A. Heckert
Ptolemy, Astronomy, & Almagest: The Ancient Greek Ptolemaic Geocentric Astronomical System
By: Paul A. Heckert
Comet Enke – A Threat To Earth? History of Short Period Comet and Chance it Will Strike Earth Again
By: Tabitha Davies
Where to see 2008's Solar Eclipse: Three Best Places to View the Eclipse This Year
In: Astronomy & Space (general)
By: Liz Kirchner
How Could Life on Earth End? Four Catastrophic Events That Would Destroy the World
In: Astronomy & Space (general)
By: John O'Connor
The Karman Line: Theodore Von Karman and the Separation of Earth and Space
In: Astronomy & Space (general)
By: Isaac M. McPhee
Peace v the UN Charter: Exceptions to the General Reservation of Space for Peaceful Purposes
By: Erin Britton
Planetary Ring Systems: Saturn, Uranus, Neptune, and Jupiter all Have Rings
By: Paul A. Heckert
The Corpus Juris Spatialis: The Laws Governing Outer Space
By: Erin Britton
Regulating Actions in Outer Space: Secondary Provisions of the Outer Space Treaty 1967
By: Erin Britton
The Outer Space Treaty 1967: Article IV and the Desire to Keep Space Peaceful
By: Erin Britton
Saturn's Ring System: Discovery, Size, Composition, Structure, & Age of Rings of Saturn
By: Paul A. Heckert
Keeping the Peace in Outer Space: A Global Desire to Reserve Space for Entirely Peaceful Purposes
By: Erin Britton
Titan, Largest Moon of Saturn: A Cold World with Nitrogen Atmosphere and Methane Lakes
By: Paul A. Heckert
The Planet Mars: Olympos Mons, Valles Marineris and the face on Mars
By: Cyrus Dehkan
In: Astronomy & Space (general)
By: Paul A. Heckert
Extraterrestrial Life on Europa: Does this Galilean Moon of Jupiter Harbor Simple Alien Creatures?
By: Paul A. Heckert
Jupiter's Galilean Moons: Galileo Discovered Io, Europa, Ganymede, & Callisto Orbiting Jupiter
By: Paul A. Heckert
Meade LX90 Telescopes with LNT: Easy To Use GoTo Telescope with Level North Technology & GPS
In: Stargazing
By: Paul A. Heckert
Tools to Learn Constellations: Green Laser Pointer, Celestron Sky Scout, & Meade mySky
In: Stargazing
By: Paul A. Heckert
Constant as the Northern Star: Misconceptions About Polaris Which Is not the Brightest in the Sky
In: Astronomy & Space (general)
By: Paul A. Heckert
Radio Astronomy: Scientists Use Radio Wavelengths to Study Celestial Phenomena
In: Astronomy & Space (general)
By: Robyn Harrison
First Space Satellite: Sputnik and the Fiftieth Anniversary of Dawn of Space Age
By: Paul A. Heckert
Pulsars and Neutron Stars: Black Holes, Neutrons, and Pulsars
By: Shawn Landis
By: Frank W. Hardy
Discovery of Astronomical X-Rays: Cygnus X-1, the First Star Identified as a Likely Black Hole
By: Paul A. Heckert
X-Ray Flickering in Cygnus X-1: Identifying HDE226868, Optical Counterpart to a Likely Black Hole
By: Paul A. Heckert
Black Hole or Neutron Star: How the Mass Tells Us What an Astronomical X-Ray Source Is
By: Paul A. Heckert
Origin of the Idea of Black Holes: Corps Obscura to Schwarzschild's Solution to Einstein's Equation
By: Paul A. Heckert
Event Horizon and Photon Sphere: Static Isolated Black Hole Structure Outside Schwarzschild Radius
By: Paul A. Heckert
Black Hole Singularity: Structure Inside the Event Horizon or Schwarzschild Radius
By: Paul A. Heckert
Constellations Lyra & Aquila Myth: Ancient Chinese Mythology of Herd-Boy and Weaver-Girl
In: Stargazing
By: Paul A. Heckert
Eclipse Watching: What to Expect Observing Lunar and Solar Eclipses
In: Stargazing
By: Paul A. Heckert
The Planck Time and the Big Bang: The Instant of Creation in the Theory of the Early Universe
In: Astrophysics
By: Paul A. Heckert
GUTS and Inflation in the Big Bang: The Inflationary Period in the Theory of the Early Universe
In: Astrophysics
By: Paul A. Heckert
Nucleosynthesis in the Big Bang: Hydrogen, Helium, Lithium, & Beryllium Made in the Early Universe
In: Astrophysics
By: Paul A. Heckert
Origin of Matter in the Universe: How Protons, Electrons, and Neutrons Formed in the Big Bang
In: Astrophysics
By: Paul A. Heckert
Lunar Eclipse August 28, 2007: Exciting Solar System Event in the Night Time Sky
By: Christine Nyholm
Mariner 4: First Probe to Photograph Mars
By: William Hamman
Can Titan Support Life? Perhaps with Liquid Ethane Lakes & an Atmosphere Similar to Earth
By: Shawn Landis
From Comet Swift-Tuttle: the Perseid Meteor Shower Is Born
In: Astronomy & Space (general)
By: Andi Bryant
Ideal Rocket Equation: The Rocket Equation elegantly predicts rocket performance
By: William Hamman
Andromeda the Milky Way versus Sol: Will the Galaxies Collide before the Sun Blows up?
In: Astronomy & Space (general)
By: Frank W. Hardy
Supernova Destroys Star Rho Cas: A Last Silent yet Bright Explosion Spews Star-Stuff Deep into Space
By: Frank W. Hardy
Specific Impulse: Measuring Rocket Propellant Efficiency
By: William Hamman
Mars as Large as the Full Moon: Why Myths About the Red Planet Dominating the Sky Are Impossible
In: Stargazing
By: Paul A. Heckert
Spectrum of the Andromeda Galaxy: Slipher First Discovered Red Shifts in the Spectra of Galaxies
In: Astrophysics
By: Paul A. Heckert
Predicting the Expanding Universe: Einstein, De Sitter, Friedman, Lemaitre, & Early Cosmology
In: Astrophysics
By: Paul A. Heckert
Discovering The Expanding Universe: Hubble and Humason Observed Redshifts of Distant Galaxies
In: Astrophysics
By: Paul A. Heckert
Black Holes Space/Time Distortion: Where Gravity has Gone Wild - What Falls in Never Comes Out
By: Frank W. Hardy
The Circle of Life The Beginning: The Birth and Life of Stars
By: Frank W. Hardy
The Circle of Life The End: The Death and Rebirth of Stars
By: Frank W. Hardy
Feeding Black Holes: Illumination of the Invisible
By: Frank W. Hardy
Is the Universe Expanding: Dark Matter and Dark Energy Quash the Debate
By: Frank W. Hardy
In: Astrophysics
By: Paul A. Heckert
History of the Big Bang Theory: Gamow, & Early Attempts to Understand the Origin of the Universe
In: Astrophysics
By: Paul A. Heckert
Blackbodies in Astrophysics: Thermal Electromagnetic Radiation from an Ideal Blackbody Radiator
In: Astrophysics
By: Paul A. Heckert
In: Astrophysics
By: Paul A. Heckert
The Cosmic Background Radiation: Discovery Supporting Big Bang Theory for the Origin of the Universe
In: Astrophysics
By: Paul A. Heckert
Planets Gliese 581B,C and D: Extrasolar Planets Recently Discovered by Astronomers
In: Astronomy & Space (general)
By: Cyrus Dehkan
Nebula in the Constellation Orion: Ancient Creation Mythology, Modern Astrophysics, & Star Formation
In: Stargazing
By: Paul A. Heckert
Myths for the Constellation Orion: Samples of Chinese, Native American, and Western Mythology
In: Stargazing
By: Paul A. Heckert
Tewa Myth for Constellation Orion: New Mexico Pueblos and the Legend of Long Sash
In: Stargazing
By: Paul A. Heckert
In: Stargazing
By: Paul A. Heckert
Phaethon & the Chariot of the Sun: The Constellation Scorpius, the Scorpion, Claims a Victim
In: Stargazing
By: Paul A. Heckert
Orion and Scorpius Constellations: Ancient Greek Myth About the Hunter and the Scorpion
In: Stargazing
By: Paul A. Heckert
Stellar Populations in the Galaxy: Walter Baade's Discovery of Population I and II Stars
By: Paul A. Heckert
Multiple and Binary Star Systems: Optical Double Stars & Visual, Eclipsing, & Spectroscopic Binaries
By: Paul A. Heckert
Hubble's Galaxy Classifications: Irregular, Elliptical, & Normal & Barred Spiral Galaxies
By: Paul A. Heckert
Astronomical Clustering of Stars: Globular and Galactic (Open) Clusters and O and B Associations
By: Paul A. Heckert
Galaxies and Clusters of Galaxies: The Milky Way Galaxy and Large Scale Structure of the Universe
By: Paul A. Heckert
ATK Propels Atlantis: Supports STS-117 Mission
By: Rahul Prabhakar
Big Bang Theory: A New Look at the Cosmos
In: Astronomy & Space (general)
By: David R. Smith
Steady State Cosmology: A Cosmological Alternative to the Big Bang Theory
In: Astrophysics
By: Paul A. Heckert
Steady State and Big Bang Theories: Fundamental Cosmological Assumptions and Observations
In: Astrophysics
By: Paul A. Heckert
Origin of the Chemical Elements: Stellar Nucleosynthesis and Supernovae Play Crucial Roles
In: Astrophysics
By: Paul A. Heckert
The Crab Nebula Supernova 1054 AD: The Biggest July 4 Fireworks Explosion in History Formed M1
By: Paul A. Heckert
Anasazi Supernova Observations: Chaco Canyon Petroglyph May Record 1054 Birth of the Crab Nebula
By: Paul A. Heckert
Crab Nebula Supernova Observations: Ancient Chinese Records of the July 4, 1054 Supernova
By: Paul A. Heckert
Why Are Astronauts Weightless: There Is Gravity in Space; They Are in Free Fall
By: Paul A. Heckert
Imaginary Time—Not What You Think: In Mathematics and Physics Imaginary Time Really Does Exist
By: Charles Anderson
Virgin Galactic: Holidays in Space: Richard Branson's Virgin Brand Extends Beyond The Earth
By: James Martin
Gravitational Lens and Dark Matter: Massive Galaxies Bend Light from Distant Quasars
By: Paul A. Heckert
Detecting Planets Orbiting Stars: Discovering Extrasolar Planets with High Resolution Spectroscopy
In: Astrophysics
By: Paul A. Heckert
Gliese 581c: Telescope at European Southern Observatory Detects New Planet
By: Scott Hayden
In: Astrophysics
By: Paul A. Heckert
Spectroscopy and Atomic Structure: How Electrons Cause Spectral Emission and Absorption Lines
In: Astrophysics
By: Paul A. Heckert
Water on Extrasolar Planets: How Did Astronomers Detect the Composition of HD 209458b?
In: Astrophysics
By: Paul A. Heckert
Is Time Travel Possible? Current ideas on travel to the future and past
In: Astrophysics
By: Cyrus Dehkan
Energy and Stellar Evolution: Conservation of Energy tells us Stars Must Evolve
In: Astrophysics
By: Paul A. Heckert
Astronomy and Car Names: Car Models with Names from Astronomy
In: Astronomy & Space (general)
By: Paul A. Heckert
Comet Shoemaker-Levy 9: The First Observed Impact on a Planetary Body
Biological and Stellar Evolution: Astronomers and Biologists have Different Meanings of Evolution
In: Astrophysics
By: Paul A. Heckert
Telescope Types for Astronomy: Reflecting Telescopes and Refracting Telescopes
In: Stargazing
By: Paul A. Heckert
Astronomical Telescope Functions: Telescopes Need Light Gathering and Resolving Power
In: Stargazing
By: Paul A. Heckert
Was the Big Bang an Explosion? A look at how the universe was formed
In: Astrophysics
By: Paul A. Heckert
Black Holes, What are They? Why Nothing Can Escape From a Black Hole
By: Paul A. Heckert
Tides and Volcanoes on Io: Tidal Forces Cause Volcanic activity on Jupiter's Moon Io
By: Paul A. Heckert
Dwarf Planets: New solar systems objects or just a new name for old ones
By: Ian Nartowicz
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