Which of the following describes a major danger of interstellar travel at near-light speed?
A) Atoms and ions in interstellar space will hit a fast-moving spacecraft like a flood of dangerous cosmic rays.
B) Time dilation will slow the heart beats of the crew to a dangerously low rate.
C) Asteroid fields floating in interstellar space will present a navigational challenge.
D) Any interstellar journey will take much longer than the lives of the crew members.
Question 2
Imagine a planet like Earth orbiting the Sun, at an average distance of 1 AU but with a highly eccentric orbit. Which of the following statements about this orbit is not true?
A) The period is longer than a year.
B) The seasons are very extreme.
C) The planet is sometimes very close to the Sun, and sometimes very far.
D) The planet does not maintain a constant speed around the Sun.
moon light
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