Asteroids, Comets and Meteors - Is that a shooting star? Asteroids are also called planetoids or minor
planets because they are in a fixed orbit around the
sun.
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Black Holes - I find black holes as fascinating as sharks. 
Discovery Channel should have a "Black Hole" week. There are basic principles of physics that influence our lives and the laws
of gravity are part of these scientific principles.
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Breathing in Space - Humans simply cannot breathe in space. 
Without gear that provides oxygen, a human would survive just a couple 
of minutes in space. Humans experience difficulty breathing at higher altitudes even while on
Earth.
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Constellations - Thousands of years ago people decided that 
they saw shapes in the sky when they connected certain patterns of 
stars. They saw bears, a crab, an archer
with his bow, and many other shapes. These shapes are called constellations.
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What Is a Moon? - Astronomers keep finding new moons orbiting 
other planets because they have improved technology for viewing space 
millions of miles from Earth. Until recently, the known moons of the planets in our solar system were
fairly large in size.
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NASA - In the 1940s during World War II both Germany and 
the United States began experimenting with rockets, mainly as means 
for carrying bombs to distant parts of the earth. For many years NASA has been involved in the International Space Station
which is operated by a group of technically developed countries around the
world.
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What is SETI? - Trained scientists have been debating the 
existence of extraterrestrial intelligence for decades. With advances in communications and space exploration
in just the last fifty years, some scientists believe that studying electromagnetic
radiation, especially in the form of radio waves, coming to earth from space is a
way to locate intelligence in the universe.
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Our Solar System - Our Sun is so massive that the pull of 
its gravity influences the space around it for millions of miles.  The Sun's gravitational force is so huge that it
keeps the Earth and the other planets in an orbit around it.
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Types of Stars - There are billions of stars just in our 
galaxy the Milky Way and scientists estimate there are 125 billion 
galaxies in the universe. With all these stars in the
universe it makes sense that there are different types of
stars even though they all look like points of light in the
night sky to the naked eye from on earth.
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The Universe - Our galaxy, the Milky Way, is estimated to 
be about 100,000 light-years in diameter and about 1,000 light-years 
thick. Astronomers estimate that the Milky
Way contains between 200 to 400 billion stars, their planets and moons, and all
other material.
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