Physical Science
By: Wayne Leon Learmond
To find out the discovery of electrons we have to travel all the way back to 1898. Back then, scientists were working with electricity, even though they did not understand that electric currents were made up of electrons. The cathode tube was a point in...
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By: Terrence Aym
The world of physics can be strange, very strange indeed. And every once in awhile something happens during an experiment that throws a wrench into the neatly constructed model of how everything works and causes all assumptions to be reassessed. Such a thing happened to...
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By: Christine Lorraine
A planetary nebula is defined as, "A bright cloud of glowing gas and dust surrounding a highly evolved star," according to encyclopedia.com. The term "nebula" originated in the mid-1600s, derived from the Greek term "nephele," which refers to a cloud, fog or...
Why we should Colonize Mars Andor the Solar System
By: CL Mclendon
As the geological evidence of Earth proves, life comes and goes on this planet in a blink of an eye. It has been estimated that there have been between five to twenty mass extinction events on Earth since life first appeared. Each caused by different...
By: Jen Cooper
A dark nebula is one of a group of celestial phenomena, generally known simply as nebula, (or nebulae in the plural,) consisting of clouds of gas and dust grains, slowly swirling tightly together in interstellar space. The term nebula was once applied to any...
By: Janet Grischy
A planetary nebula is one stage of a star’s slow death. It has nothing to do with planets. The astronomer William Herschel named this kind of nebula for what he saw as a resemblance to the planet Uranus, as it appeared through primitive eighteenth...
What is a dark nebula?
By: Krystal Waldron
Clouds which are dusty, obscure and block background light within the galaxy, are called dark nebulae. The most famous of these known to man is the Horsehead Nebula. These dark clouds of gas and dust, which sit within the Milky Way Galaxy, only become visible...
The difference between globular clusters and open clusters
By: Sharon O'Connell
Groups of stars are known as clusters. There are two types of clusters in our universe: open and globular. Open clusters can contain as little as a dozen to several hundred stars. Open star clusters are closer to our galaxy than globular clusters. Stars in...
By: John Traveler
Planetary nebula were so named by 18th century astronomers because through a telescope they appear as a disk not unlike the planets of our solar system. But even though they may have the appearance of planets, hence the name, they are not. They are instead...
By: Michal Dorcak
The difference between globular clusters and open clusters is significant and fairly obvious. These two types of star clusters harbor different types of stars. Also, the strength of gravitational bonds between the stars differs significantly. Open clusters Open clusters are also known as galactic clusters...
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