Black Holes
Ker Than
出版社:Children's Press (Dublin)
出版时间:2010-03
ISBN:9780531228012
词汇量:2220
页数:48
类别:
虚构:非虚构
开本:
阅读年龄:阅读年龄 8-9岁 (28.0%), 7-8岁 (16.8%)
This introduction to black holes explains how stars become black holes, looks at different types of black holes, and discusses what is inside a black hole and how scientists study them.