21st Century Astronomy
21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 24, Problem 27QP
To determine

The evidence of existence of life found on Mars by the two Viking spacecraft and the Phoenix Lander.

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The principle cause of our intense interest in Mars in the decades before the dawn of the space age was that     Answers: A. a few astronomers believed that they saw evidence of an intelligent civilization on Mars.   B. Mars has seasons just like the Earth and therefore should be inhabitable by humans.   C. Mars has an unusual surface color and global dust storms, creating strange weather patterns.   D. Mars has unusual orbital properties making our understanding of its motion around the Sun very difficult.
Out of the inner planets in the solar system (Mercury,Venus and Mars), Which do you think is most likely to be colonized? Explain why?
Which of the following is least reasonable regarding the concept of a habitable zone? Group of answer choices   M-type stars have wider habitable zones than G-type stars.   It is a region around a star where liquid water could be found on a planet's surface.   The habitable zone of a less massive star would be closer to the star.   In the course of millions of years, our habitable zone will slowly shift from Earth to Mars.   The Galactic habitable zone cannot be too close to the Galactic center because the radiation from the bright stars and supernovae in the crowded inner part of the Galaxy would probably be detrimental to life.
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