Escape speed from the Sun is
A) about the same as from Earth.
B) very much greater than for Earth.
C) indefinite.
Answer: B
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Because we know that the half-lives of many radioactive isotopes are millions of years, we can deduce that
a. the longer it exists the more radioactive nuclei Earth produces. b. the sun is the source of all the radioactive nuclei on Earth. c. there must have been many more radioactive nuclei on Earth when life began. d. there must have been far fewer radioactive nuclei on Earth before life began. e. the natural radioactivity of minerals on the Earth was created by the Earth's internal temperature.
Mercury presents the same side to the Sun:
A) every other orbit. B) all the time, just like our Moon. C) every 12 hours. D) every third orbit. E) twice every orbit.
Process of Science: Because we do not see stellar parallaxes with our eyes, we conclude that the Earth is at the center of the Solar System
Indicate whether the statement is true or false
Fusion of hydrogen nuclei is the origin of solar energy
a. True b. False Indicate whether the statement is true or false