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Science Help

Get help with science by selecting the topic below that you're interested in learning more about. From biology and chemistry to physics we've got study materials to help you learn.

Study Guides

showing 11 - 20 of 699
  • 11.

    The Search for Extraterrestrial Life Help

    What Is Life? We of the human species have entered the third millennium. We have wondered for a long time whether or not life exists on other worlds, but we do not yet know the answer. There are tantalizing clues, and some astronomers believe that extraterrestrial ...

  • 12.

    Brightness and Distance Help

    Brightness and Distance Have you ever heard that stars are “distant suns”? This is true, but it does not tell the whole story. There are plenty of stars that resemble our Sun, but many are larger or smaller, brighter or dimmer, or hotter or cooler. ...

  • 13.

    Matter and Antimatter Help

    Matter And Antimatter The Cosmos can do strange things to matter. Strange, that is, according to what is considered “normal” here on Earth. Some scientists think that these extreme manifestations—antiparticles, neutron stars, geometric points ...

  • 14.

    Types of Galaxies Help

    Types Of Galaxies When telescopes became powerful enough to resolve nebulae into definite shapes, one type of nebula presented a conundrum. Many of the spiral nebulae , which looked like whirlpools of glowing gas, had spectral lines whose wavelengths were ...

  • 15.

    Relativity of Simultaneity Help

    Relativity of Simultaneity Relativity theory has a reputation as something only geniuses can understand. However, the basics of relativity are no more difficult to grasp than the fundamentals of any other theory. Some ...

  • 16.

    Optics and Telescopes Help

    Basic Optics Until a few hundred years ago, the only instrument available for astronomical observation was the human eye. This changed in the 1600s when several experimenters, including such notables as Galileo Galilei and Isaac Newton, combined lenses and ...

  • 17.

    Traveling in Space Help

    Traveling in Space Ever since human beings first realized that the nighttime stars are distant suns, adventurous humans have dreamed about traveling among them. During the late 1800s and early 1900s, the true vastness of the Universe became apparent, and the sheer ...

  • 18.

    Your Home Observatory Help

    Your Home Observatory Now that you have some knowledge of what goes on beyond the reaches of Earth’s atmosphere, you can more fully appreciate what you see when you look up after the Sun goes down. You don’t have to spend your life’s savings on ...

  • 19.

    Astronomy Final Practice Test

    Astronomy Final Practice Test A good score is at least 75 correct. Answers are given at the end. It is best to have a friend check your score the first time so that you won’t memorize the answers if you want to take the test again. ...

  • 20.

    Biology, Organisms, and Order Help

    Introduction to Biology Hello, there! It’s time for you to start teaching yourself some of the fundamental and fascinating facts about biology (pronounced as buy- AHL -oh-jee). The word, biology, comes from the ...

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