Earth required only 1 million years to produce the first cells and another million years for intelligence to emerge
a. True
b. False
Indicate whether the statement is true or false
False
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Which of the following is a contribution that Kepler made to astronomy?
A. He discovered his Three laws (of Planetary Motion). B. He discovered four moons (or satellites) of Jupiter. C. He discovered epicycles. D. He determined the size of Earth.
What factors can complicate the collapse of an interstellar cloud into a star?
What will be an ideal response?
Suppose the star Betelgeuse (the upper left shoulder of Orion) were to become a supernova tomorrow (as seen here on Earth). What would it look like to the naked eye?
A) We'd see a cloud of gas expanding away from the position where Betelgeuse used to be. Over a period of a few weeks, this cloud would fill our entire sky. B) Because the supernova event destroys the star, Betelgeuse would suddenly disappear from view. C) Betelgeuse would remain a dot of light but would suddenly become so bright that, for a few weeks, we'd be able to see this dot in the daytime. D) Betelgeuse would suddenly appear to grow larger in size, soon reaching the size of the full moon. It would also be about as bright as the full moon.
Addition of an electron to an atom gives a
a. negative ion. b. neutron. c. new element. d. positive ion.