CK-12 Foundation
Ck 12: Earth Science: Development of Theories Study Guide
[Free Registration/Login may be required to access all resource tools.] This study guide briefly summarizes key points about the development of theories in science. Includes a few questions to check for understanding.
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Dinosaurs' End, the Gravitational Hypothesis
The author of this site feels that there are too many problems with the current theories for why dinosaurs became extinct. He believes that his gravitational hypothesis is the correct answer, the dinosaurs suddenly got too heavy.
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Scientists Say Star Collision Caused Dinosaur Extinction
"Israeli scientists have a new theory on why the dinosaurs became extinct: cosmic radiation that bombarded the Earth following the collision of two neutron stars." This article discusses the details of the theory.