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What Do We Know About Stars & Galaxies?
     

What Do We Know About Stars & Galaxies?

by John Farndon
 

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This book explains how the Universe is made up, from stars and their systems to galaxies and globular clusters.

Overview

This book explains how the Universe is made up, from stars and their systems to galaxies and globular clusters.

Editorial Reviews

Children's Literature - Barbara L. Talcroft
Building on what young scientists already know, the "Earth, Space, and Beyond" series explores our universe in more detail for middle school astronomers and even young adults. This volume helps readers understand the latest in astronomy, like distances and magnitudes of stars and how astronomers spot stars receding or advancing on us by color ("redshift" and "blueshift" as light waves stretch or squash). Newer telescopes can be mounted on satellites, like the Hubble Space Telescope, while a color photo shows Chile's mountaintop Cerro Tololo Observatory, which searches for supernovae. Growing knowledge of the universe's size suggests it may contain 100 billion galaxies; new ways to measure their distances from Earth reveal that some are 13.2 billion light-years away—that means we're seeing some of the earliest ever formed in the universe. This book is easily the most beautiful of the series, filled with images of star-studded skies, swirling galaxies (spiral, elliptical, starburst), and glowing nebulae, including the superhot "Butterfly Nebula." Especially fascinating is a striking picture of a distant galaxy with dark rings; astronomers think it may show "dark matter," formerly thought invisible. Black holes (where dense gravity sucks in everything) are tracked with telescopes like the Chandra, whose X-ray sensitivity produced a photo of a possible black hole in superdense Sagittarius A* of our own Milky Way. Will the universe end? Astronomers have discovered that galaxies and stars have a finite lifespan, while the universe itself seems to be stretching ever outward. One day, in an estimated 20 billion years, its dark energy will tear it apart. In addition to a very necessary glossary and a list of websites, students will find a chart of star magnitudes and distances with an explanation of why some stars can't be seen. Reviewer: Barbara L. Talcroft

Product Details

ISBN-13:
9781410941862
Publisher:
Raintree Publishers
Publication date:
07/15/2011
Series:
Earth, Space, & Beyond
Pages:
48
Product dimensions:
7.50(w) x 9.80(h) x 0.40(d)
Lexile:
NC730L (what's this?)
Age Range:
11 - 15 Years

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