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In the book a Wrinkle In Time, Mrs. Who, Mrs. Whatsit, and Mrs. Which were really stars in human form. The book was written by Madeline L'Engle.

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Who wrote the science fiction book about a boy who finds a shed where time speeds up He also wrote the book about the mystical silver rock that allowed people to time travel?

The science fiction book about a boy who finds a shed where time speeds up is "The Shining Man" by Terry Pratchett. The book about the mystical silver rock that allowed people to time travel is "The Enchanted Rock" by Larry Niven.


Who wrote the first book on time travel?

Was it Mark Twain's "A Connecticut Yankee in King Arthur's court?


Why are upper-main-sequence stars also called high-luminosity stars unlikely sites for intelligent civilizations?

Our Earth is about 4.5 billion years old. While making any hard-and-fast assertions based on a single sample is foolish, it seems likely that it took quite a while for life to develop the Earth, and a substantial LONGER time for intelligent life to develop.(The fact that the Earth has been irregularly whacked by large objects from space hasn't helped much.)If our single example is typical (about which we can only guess) then high-mass stars which develop and go nova or supernova in less than a couple of hundred million years may not allow enough time for life to form on any hypothetical planets around them.However, it is possible that other forms of life might arise in vastly different environments, and might happen much more quickly. The physicist Dr. Robert Forward wrote a science fiction novel entitled "Dragon's Egg" concerning a race of intelligent beings who live on the surface of a neutron star.


Who wrote It is still open to discussion whether psychology is a natural science or whether it can be regarded as a science at all?

This quote is from Sigmund Freud, an Austrian neurologist and the founder of psychoanalysis. Freud's work in psychology challenged traditional scientific methods and raised important questions about the nature of psychology as a science.


Carl Sagan himself wrote that document?

Carl Sagan was a renowned astrophysicist, cosmologist, and science communicator known for his ability to popularize science. He authored numerous books and papers, including the influential work "Cosmos," which explores the universe and our place within it. If you are referring to a specific document Sagan wrote, please provide further context so I can give a more precise answer.