The Milky Way, the galaxy containing our solar system, is about 100,000 light-years in diameter and about 10,000 light-years thick.
Aphelion: see Orbit.
Apogee: see Orbit…
(Encyclopedia) Leonardo da VinciLeonardo da Vincidə vĭnˈchē, Ital. lāōnärˈdō dä vēnˈchē [key], 1452–1519, Italian painter, sculptor, architect, musician, engineer, and scientist, b. near Vinci, a…
Think the Empire State Building, Grand Canyon and the Eifel Tower are the most-visited tourist attractions in the world? Think again. by Jennie Wood Grand Central Station, New York…
You’ve probably heard of the theory of relativity. And you may even know that motion, mass, energy, time and space are all relative. But if you’re confused about what any of that actually means…
WHAT IS THE MOON MADE OF? HOW DOES THE MOON AFFECT EARTH? PhasesFIND OUT MOREIn space, the closest object to Earth is the Moon. It orbits Earth, and appears to change shape as it moves—the…
A Twice-in-a-Lifetime Event by Shmuel Ross This feature was written in the summer of 2004. Book a trip to Africa, and pray for clear skies. That’s one possible reaction to the upcoming transit…
Kidneys: Not Just for Urine!Anatomy and PhysiologyHormonesFeedback: Not Just for GuitarsHow Hormones WorkHypothalamus: The Head HonchoPituitary: The First LieutenantThyroidKidneys: Not Just for…
WARNING!LOOPS IN THE ATMOSPHERESPOTS ON THE SUNNEUTRINOS FROM THE SUNSPACE WEATHERSOLAR ECLIPSEFIND OUT MOREDominating our corner of space is a star we call the Sun. It travels through space…
The Question: How does one abbreviate the rank of Captain (U.S. Navy) in correspondence? The Answer: When corresponding with a captain in the U.S. Navy, the…
