Groundbreaking Scientific Experiments, Inventions, and Discoveries of the 17th Century

By Michael Windelspecht | Go to book overview

N

Nebula (1609–1656): Even with the unaided eye the night sky appears to be full of objects. A casual examination reveals not only an abundance of stars and the predictable motions of the moon and planets, but also the possibility of an occasional appearance by a meteorite or comet. However, with a more detailed look one can detect smudges in the night sky, areas where the stars appear to be blurred. These areas are called nebulae after the Latin word for cloud or mist. The early Greek astronomers provide some of the first written descriptions of nebulae in their early preparation of sky charts. The Greek astronomer Hipparchus produced some of the most detailed and significant records of astronomical observations during ancient times. Hipparchus made many contributions to astronomy including assigning brightness, or magnitude, to stars, identifying new stars or novas, and refining calculations on lunar motion and equinoxes. This database, which formed the basis of subsequent efforts in Greek astronomy, mentions the positions of two nebulae. Two centuries later, Ptolemy’s Almagest, a compilation of Greek astronomical and mathematical accomplishments, contains two volumes dedicated to star maps (see STAR ATLASES). In this work Ptolemy lists information on over 1,000 stars, including three additional nebula-like objects. However, further investigation into the nature of these objects would have to wait until centuries later.

The invention of the telescope revolutionized observational astronomy. With the aid of the telescope the vast, complex nature of the heavens was revealed. To the unaided eye, nebulae all appear to be faint glowing clouds or smudges of light. However, with the increased magnification available using the telescope, many nebulae were ob-

-173-

Notes for this page

Add a new note
If you are trying to select text to create highlights or citations, remember that you must now click or tap on the first word, and then click or tap on the last word.
One moment ...
Default project is now your active project.
Project items

Items saved from this book

This book has been saved
Highlights (0)
Some of your highlights are legacy items.

Highlights saved before July 30, 2012 will not be displayed on their respective source pages.

You can easily re-create the highlights by opening the book page or article, selecting the text, and clicking “Highlight.”

Citations (0)
Some of your citations are legacy items.

Any citation created before July 30, 2012 will labeled as a “Cited page.” New citations will be saved as cited passages, pages or articles.

We also added the ability to view new citations from your projects or the book or article where you created them.

Notes (0)
Bookmarks (0)

You have no saved items from this book

Project items include:
  • Saved book/article
  • Highlights
  • Quotes/citations
  • Notes
  • Bookmarks
Notes
Cite this page

Cited page

Style
Citations are available only to our active members.
Buy instant access to cite pages or passages in MLA, APA and Chicago citation styles.

(Einhorn, 1992, p. 25)

(Einhorn 25)

1. Lois J. Einhorn, Abraham Lincoln, the Orator: Penetrating the Lincoln Legend (Westport, CT: Greenwood Press, 1992), 25, http://www.questia.com/read/27419298.

Cited page

Bookmark this page
Groundbreaking Scientific Experiments, Inventions, and Discoveries of the 17th Century
Table of contents

Table of contents

  • Title Page iii
  • Contents vii
  • Series Foreword xi
  • Acknowledgements xv
  • Introduction xvii
  • Experiments, Inventions and Discoveries 1
  • A 3
  • B 15
  • C 34
  • E 54
  • F 64
  • G 70
  • H 81
  • J 109
  • K 115
  • L 121
  • M 148
  • N 173
  • O 177
  • P 187
  • S 201
  • T 224
  • V 241
  • Appendix 245
  • Glossary of Technical Terms 247
  • Selected Bibliography 257
  • Subject Index 261
  • Name Index 267
  • About the Author 271
Settings

Settings

Typeface
Text size Smaller Larger Reset View mode
Search within

Search within this book

Look up

Look up a word

  • Dictionary
  • Thesaurus
Please submit a word or phrase above.
Print this page

Print this page

Why can't I print more than one page at a time?

Help
Full screen
/ 271

matching results for page

    Questia reader help

    How to highlight and cite specific passages

    1. Click or tap the first word you want to select.
    2. Click or tap the last word you want to select, and you’ll see everything in between get selected.
    3. You’ll then get a menu of options like creating a highlight or a citation from that passage of text.

    OK, got it!

    Cited passage

    Style
    Citations are available only to our active members.
    Buy instant access to cite pages or passages in MLA, APA and Chicago citation styles.

    "Portraying himself as an honest, ordinary person helped Lincoln identify with his audiences." (Einhorn, 1992, p. 25).

    "Portraying himself as an honest, ordinary person helped Lincoln identify with his audiences." (Einhorn 25)

    "Portraying himself as an honest, ordinary person helped Lincoln identify with his audiences."1

    1. Lois J. Einhorn, Abraham Lincoln, the Orator: Penetrating the Lincoln Legend (Westport, CT: Greenwood Press, 1992), 25, http://www.questia.com/read/27419298.

    Cited passage

    Thanks for trying Questia!

    Please continue trying out our research tools, but please note, full functionality is available only to our active members.

    Your work will be lost once you leave this Web page.

    Buy instant access to save your work.

    Already a member? Log in now.

    Author Advanced search

    Oops!

    An unknown error has occurred. Please click the button below to reload the page. If the problem persists, please try again in a little while.